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| 1 | <?php |
| 2 | |
| 3 | /** |
| 4 | * Pure-PHP PKCS#1 (v2.1) compliant implementation of RSA. |
| 5 | * |
| 6 | * PHP versions 4 and 5 |
| 7 | * |
| 8 | * Here's an example of how to encrypt and decrypt text with this library: |
| 9 | * <code> |
| 10 | * <?php |
| 11 | * include 'Crypt/RSA.php'; |
| 12 | * |
| 13 | * $rsa = new Crypt_RSA(); |
| 14 | * extract($rsa->createKey()); |
| 15 | * |
| 16 | * $plaintext = 'terrafrost'; |
| 17 | * |
| 18 | * $rsa->loadKey($privatekey); |
| 19 | * $ciphertext = $rsa->encrypt($plaintext); |
| 20 | * |
| 21 | * $rsa->loadKey($publickey); |
| 22 | * echo $rsa->decrypt($ciphertext); |
| 23 | * ?> |
| 24 | * </code> |
| 25 | * |
| 26 | * Here's an example of how to create signatures and verify signatures with this library: |
| 27 | * <code> |
| 28 | * <?php |
| 29 | * include 'Crypt/RSA.php'; |
| 30 | * |
| 31 | * $rsa = new Crypt_RSA(); |
| 32 | * extract($rsa->createKey()); |
| 33 | * |
| 34 | * $plaintext = 'terrafrost'; |
| 35 | * |
| 36 | * $rsa->loadKey($privatekey); |
| 37 | * $signature = $rsa->sign($plaintext); |
| 38 | * |
| 39 | * $rsa->loadKey($publickey); |
| 40 | * echo $rsa->verify($plaintext, $signature) ? 'verified' : 'unverified'; |
| 41 | * ?> |
| 42 | * </code> |
| 43 | * |
| 44 | * LICENSE: Permission is hereby granted, free of charge, to any person obtaining a copy |
| 45 | * of this software and associated documentation files (the "Software"), to deal |
| 46 | * in the Software without restriction, including without limitation the rights |
| 47 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 48 | * copies of the Software, and to permit persons to whom the Software is |
| 49 | * furnished to do so, subject to the following conditions: |
| 50 | * |
| 51 | * The above copyright notice and this permission notice shall be included in |
| 52 | * all copies or substantial portions of the Software. |
| 53 | * |
| 54 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 55 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 56 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| 57 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 58 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 59 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| 60 | * THE SOFTWARE. |
| 61 | * |
| 62 | * @category Crypt |
| 63 | * @package Crypt_RSA |
| 64 | * @author Jim Wigginton <terrafrost@php.net> |
| 65 | * @copyright 2009 Jim Wigginton |
| 66 | * @license http://www.opensource.org/licenses/mit-license.html MIT License |
| 67 | * @link http://phpseclib.sourceforge.net |
| 68 | */ |
| 69 | |
| 70 | /** |
| 71 | * Include Crypt_Random |
| 72 | */ |
| 73 | // the class_exists() will only be called if the crypt_random_string function hasn't been defined and |
| 74 | // will trigger a call to __autoload() if you're wanting to auto-load classes |
| 75 | // call function_exists() a second time to stop the include_once from being called outside |
| 76 | // of the auto loader |
| 77 | if (!function_exists('crypt_random_string')) { |
| 78 | include_once 'Random.php'; |
| 79 | } |
| 80 | |
| 81 | /** |
| 82 | * Include Crypt_Hash |
| 83 | */ |
| 84 | if (!class_exists('Crypt_Hash')) { |
| 85 | include_once 'Hash.php'; |
| 86 | } |
| 87 | |
| 88 | /**#@+ |
| 89 | * @access public |
| 90 | * @see Crypt_RSA::encrypt() |
| 91 | * @see Crypt_RSA::decrypt() |
| 92 | */ |
| 93 | /** |
| 94 | * Use {@link http://en.wikipedia.org/wiki/Optimal_Asymmetric_Encryption_Padding Optimal Asymmetric Encryption Padding} |
| 95 | * (OAEP) for encryption / decryption. |
| 96 | * |
| 97 | * Uses sha1 by default. |
| 98 | * |
| 99 | * @see Crypt_RSA::setHash() |
| 100 | * @see Crypt_RSA::setMGFHash() |
| 101 | */ |
| 102 | define('CRYPT_RSA_ENCRYPTION_OAEP', 1); |
| 103 | /** |
| 104 | * Use PKCS#1 padding. |
| 105 | * |
| 106 | * Although CRYPT_RSA_ENCRYPTION_OAEP offers more security, including PKCS#1 padding is necessary for purposes of backwards |
| 107 | * compatibility with protocols (like SSH-1) written before OAEP's introduction. |
| 108 | */ |
| 109 | define('CRYPT_RSA_ENCRYPTION_PKCS1', 2); |
| 110 | /** |
| 111 | * Do not use any padding |
| 112 | * |
| 113 | * Although this method is not recommended it can none-the-less sometimes be useful if you're trying to decrypt some legacy |
| 114 | * stuff, if you're trying to diagnose why an encrypted message isn't decrypting, etc. |
| 115 | */ |
| 116 | define('CRYPT_RSA_ENCRYPTION_NONE', 3); |
| 117 | /**#@-*/ |
| 118 | |
| 119 | /**#@+ |
| 120 | * @access public |
| 121 | * @see Crypt_RSA::sign() |
| 122 | * @see Crypt_RSA::verify() |
| 123 | * @see Crypt_RSA::setHash() |
| 124 | */ |
| 125 | /** |
| 126 | * Use the Probabilistic Signature Scheme for signing |
| 127 | * |
| 128 | * Uses sha1 by default. |
| 129 | * |
| 130 | * @see Crypt_RSA::setSaltLength() |
| 131 | * @see Crypt_RSA::setMGFHash() |
| 132 | */ |
| 133 | define('CRYPT_RSA_SIGNATURE_PSS', 1); |
| 134 | /** |
| 135 | * Use the PKCS#1 scheme by default. |
| 136 | * |
| 137 | * Although CRYPT_RSA_SIGNATURE_PSS offers more security, including PKCS#1 signing is necessary for purposes of backwards |
| 138 | * compatibility with protocols (like SSH-2) written before PSS's introduction. |
| 139 | */ |
| 140 | define('CRYPT_RSA_SIGNATURE_PKCS1', 2); |
| 141 | /**#@-*/ |
| 142 | |
| 143 | /**#@+ |
| 144 | * @access private |
| 145 | * @see Crypt_RSA::createKey() |
| 146 | */ |
| 147 | /** |
| 148 | * ASN1 Integer |
| 149 | */ |
| 150 | define('CRYPT_RSA_ASN1_INTEGER', 2); |
| 151 | /** |
| 152 | * ASN1 Bit String |
| 153 | */ |
| 154 | define('CRYPT_RSA_ASN1_BITSTRING', 3); |
| 155 | /** |
| 156 | * ASN1 Octet String |
| 157 | */ |
| 158 | define('CRYPT_RSA_ASN1_OCTETSTRING', 4); |
| 159 | /** |
| 160 | * ASN1 Object Identifier |
| 161 | */ |
| 162 | define('CRYPT_RSA_ASN1_OBJECT', 6); |
| 163 | /** |
| 164 | * ASN1 Sequence (with the constucted bit set) |
| 165 | */ |
| 166 | define('CRYPT_RSA_ASN1_SEQUENCE', 48); |
| 167 | /**#@-*/ |
| 168 | |
| 169 | /**#@+ |
| 170 | * @access private |
| 171 | * @see Crypt_RSA::Crypt_RSA() |
| 172 | */ |
| 173 | /** |
| 174 | * To use the pure-PHP implementation |
| 175 | */ |
| 176 | define('CRYPT_RSA_MODE_INTERNAL', 1); |
| 177 | /** |
| 178 | * To use the OpenSSL library |
| 179 | * |
| 180 | * (if enabled; otherwise, the internal implementation will be used) |
| 181 | */ |
| 182 | define('CRYPT_RSA_MODE_OPENSSL', 2); |
| 183 | /**#@-*/ |
| 184 | |
| 185 | /** |
| 186 | * Default openSSL configuration file. |
| 187 | */ |
| 188 | define('CRYPT_RSA_OPENSSL_CONFIG', dirname(__FILE__) . '/../openssl.cnf'); |
| 189 | |
| 190 | /**#@+ |
| 191 | * @access public |
| 192 | * @see Crypt_RSA::createKey() |
| 193 | * @see Crypt_RSA::setPrivateKeyFormat() |
| 194 | */ |
| 195 | /** |
| 196 | * PKCS#1 formatted private key |
| 197 | * |
| 198 | * Used by OpenSSH |
| 199 | */ |
| 200 | define('CRYPT_RSA_PRIVATE_FORMAT_PKCS1', 0); |
| 201 | /** |
| 202 | * PuTTY formatted private key |
| 203 | */ |
| 204 | define('CRYPT_RSA_PRIVATE_FORMAT_PUTTY', 1); |
| 205 | /** |
| 206 | * XML formatted private key |
| 207 | */ |
| 208 | define('CRYPT_RSA_PRIVATE_FORMAT_XML', 2); |
| 209 | /** |
| 210 | * PKCS#8 formatted private key |
| 211 | */ |
| 212 | define('CRYPT_RSA_PRIVATE_FORMAT_PKCS8', 3); |
| 213 | /**#@-*/ |
| 214 | |
| 215 | /**#@+ |
| 216 | * @access public |
| 217 | * @see Crypt_RSA::createKey() |
| 218 | * @see Crypt_RSA::setPublicKeyFormat() |
| 219 | */ |
| 220 | /** |
| 221 | * Raw public key |
| 222 | * |
| 223 | * An array containing two Math_BigInteger objects. |
| 224 | * |
| 225 | * The exponent can be indexed with any of the following: |
| 226 | * |
| 227 | * 0, e, exponent, publicExponent |
| 228 | * |
| 229 | * The modulus can be indexed with any of the following: |
| 230 | * |
| 231 | * 1, n, modulo, modulus |
| 232 | */ |
| 233 | define('CRYPT_RSA_PUBLIC_FORMAT_RAW', 3); |
| 234 | /** |
| 235 | * PKCS#1 formatted public key (raw) |
| 236 | * |
| 237 | * Used by File/X509.php |
| 238 | * |
| 239 | * Has the following header: |
| 240 | * |
| 241 | * -----BEGIN RSA PUBLIC KEY----- |
| 242 | * |
| 243 | * Analogous to ssh-keygen's pem format (as specified by -m) |
| 244 | */ |
| 245 | define('CRYPT_RSA_PUBLIC_FORMAT_PKCS1', 4); |
| 246 | define('CRYPT_RSA_PUBLIC_FORMAT_PKCS1_RAW', 4); |
| 247 | /** |
| 248 | * XML formatted public key |
| 249 | */ |
| 250 | define('CRYPT_RSA_PUBLIC_FORMAT_XML', 5); |
| 251 | /** |
| 252 | * OpenSSH formatted public key |
| 253 | * |
| 254 | * Place in $HOME/.ssh/authorized_keys |
| 255 | */ |
| 256 | define('CRYPT_RSA_PUBLIC_FORMAT_OPENSSH', 6); |
| 257 | /** |
| 258 | * PKCS#1 formatted public key (encapsulated) |
| 259 | * |
| 260 | * Used by PHP's openssl_public_encrypt() and openssl's rsautl (when -pubin is set) |
| 261 | * |
| 262 | * Has the following header: |
| 263 | * |
| 264 | * -----BEGIN PUBLIC KEY----- |
| 265 | * |
| 266 | * Analogous to ssh-keygen's pkcs8 format (as specified by -m). Although PKCS8 |
| 267 | * is specific to private keys it's basically creating a DER-encoded wrapper |
| 268 | * for keys. This just extends that same concept to public keys (much like ssh-keygen) |
| 269 | */ |
| 270 | define('CRYPT_RSA_PUBLIC_FORMAT_PKCS8', 7); |
| 271 | /**#@-*/ |
| 272 | |
| 273 | /** |
| 274 | * Pure-PHP PKCS#1 compliant implementation of RSA. |
| 275 | * |
| 276 | * @package Crypt_RSA |
| 277 | * @author Jim Wigginton <terrafrost@php.net> |
| 278 | * @access public |
| 279 | */ |
| 280 | class Crypt_RSA |
| 281 | { |
| 282 | /** |
| 283 | * Precomputed Zero |
| 284 | * |
| 285 | * @var Array |
| 286 | * @access private |
| 287 | */ |
| 288 | var $zero; |
| 289 | |
| 290 | /** |
| 291 | * Precomputed One |
| 292 | * |
| 293 | * @var Array |
| 294 | * @access private |
| 295 | */ |
| 296 | var $one; |
| 297 | |
| 298 | /** |
| 299 | * Private Key Format |
| 300 | * |
| 301 | * @var Integer |
| 302 | * @access private |
| 303 | */ |
| 304 | var $privateKeyFormat = CRYPT_RSA_PRIVATE_FORMAT_PKCS1; |
| 305 | |
| 306 | /** |
| 307 | * Public Key Format |
| 308 | * |
| 309 | * @var Integer |
| 310 | * @access public |
| 311 | */ |
| 312 | var $publicKeyFormat = CRYPT_RSA_PUBLIC_FORMAT_PKCS8; |
| 313 | |
| 314 | /** |
| 315 | * Modulus (ie. n) |
| 316 | * |
| 317 | * @var Math_BigInteger |
| 318 | * @access private |
| 319 | */ |
| 320 | var $modulus; |
| 321 | |
| 322 | /** |
| 323 | * Modulus length |
| 324 | * |
| 325 | * @var Math_BigInteger |
| 326 | * @access private |
| 327 | */ |
| 328 | var $k; |
| 329 | |
| 330 | /** |
| 331 | * Exponent (ie. e or d) |
| 332 | * |
| 333 | * @var Math_BigInteger |
| 334 | * @access private |
| 335 | */ |
| 336 | var $exponent; |
| 337 | |
| 338 | /** |
| 339 | * Primes for Chinese Remainder Theorem (ie. p and q) |
| 340 | * |
| 341 | * @var Array |
| 342 | * @access private |
| 343 | */ |
| 344 | var $primes; |
| 345 | |
| 346 | /** |
| 347 | * Exponents for Chinese Remainder Theorem (ie. dP and dQ) |
| 348 | * |
| 349 | * @var Array |
| 350 | * @access private |
| 351 | */ |
| 352 | var $exponents; |
| 353 | |
| 354 | /** |
| 355 | * Coefficients for Chinese Remainder Theorem (ie. qInv) |
| 356 | * |
| 357 | * @var Array |
| 358 | * @access private |
| 359 | */ |
| 360 | var $coefficients; |
| 361 | |
| 362 | /** |
| 363 | * Hash name |
| 364 | * |
| 365 | * @var String |
| 366 | * @access private |
| 367 | */ |
| 368 | var $hashName; |
| 369 | |
| 370 | /** |
| 371 | * Hash function |
| 372 | * |
| 373 | * @var Crypt_Hash |
| 374 | * @access private |
| 375 | */ |
| 376 | var $hash; |
| 377 | |
| 378 | /** |
| 379 | * Length of hash function output |
| 380 | * |
| 381 | * @var Integer |
| 382 | * @access private |
| 383 | */ |
| 384 | var $hLen; |
| 385 | |
| 386 | /** |
| 387 | * Length of salt |
| 388 | * |
| 389 | * @var Integer |
| 390 | * @access private |
| 391 | */ |
| 392 | var $sLen; |
| 393 | |
| 394 | /** |
| 395 | * Hash function for the Mask Generation Function |
| 396 | * |
| 397 | * @var Crypt_Hash |
| 398 | * @access private |
| 399 | */ |
| 400 | var $mgfHash; |
| 401 | |
| 402 | /** |
| 403 | * Length of MGF hash function output |
| 404 | * |
| 405 | * @var Integer |
| 406 | * @access private |
| 407 | */ |
| 408 | var $mgfHLen; |
| 409 | |
| 410 | /** |
| 411 | * Encryption mode |
| 412 | * |
| 413 | * @var Integer |
| 414 | * @access private |
| 415 | */ |
| 416 | var $encryptionMode = CRYPT_RSA_ENCRYPTION_OAEP; |
| 417 | |
| 418 | /** |
| 419 | * Signature mode |
| 420 | * |
| 421 | * @var Integer |
| 422 | * @access private |
| 423 | */ |
| 424 | var $signatureMode = CRYPT_RSA_SIGNATURE_PSS; |
| 425 | |
| 426 | /** |
| 427 | * Public Exponent |
| 428 | * |
| 429 | * @var Mixed |
| 430 | * @access private |
| 431 | */ |
| 432 | var $publicExponent = false; |
| 433 | |
| 434 | /** |
| 435 | * Password |
| 436 | * |
| 437 | * @var String |
| 438 | * @access private |
| 439 | */ |
| 440 | var $password = false; |
| 441 | |
| 442 | /** |
| 443 | * Components |
| 444 | * |
| 445 | * For use with parsing XML formatted keys. PHP's XML Parser functions use utilized - instead of PHP's DOM functions - |
| 446 | * because PHP's XML Parser functions work on PHP4 whereas PHP's DOM functions - although surperior - don't. |
| 447 | * |
| 448 | * @see Crypt_RSA::_start_element_handler() |
| 449 | * @var Array |
| 450 | * @access private |
| 451 | */ |
| 452 | var $components = array(); |
| 453 | |
| 454 | /** |
| 455 | * Current String |
| 456 | * |
| 457 | * For use with parsing XML formatted keys. |
| 458 | * |
| 459 | * @see Crypt_RSA::_character_handler() |
| 460 | * @see Crypt_RSA::_stop_element_handler() |
| 461 | * @var Mixed |
| 462 | * @access private |
| 463 | */ |
| 464 | var $current; |
| 465 | |
| 466 | /** |
| 467 | * OpenSSL configuration file name. |
| 468 | * |
| 469 | * Set to null to use system configuration file. |
| 470 | * @see Crypt_RSA::createKey() |
| 471 | * @var Mixed |
| 472 | * @Access public |
| 473 | */ |
| 474 | var $configFile; |
| 475 | |
| 476 | /** |
| 477 | * Public key comment field. |
| 478 | * |
| 479 | * @var String |
| 480 | * @access private |
| 481 | */ |
| 482 | var $comment = 'phpseclib-generated-key'; |
| 483 | |
| 484 | /** |
| 485 | * The constructor |
| 486 | * |
| 487 | * If you want to make use of the openssl extension, you'll need to set the mode manually, yourself. The reason |
| 488 | * Crypt_RSA doesn't do it is because OpenSSL doesn't fail gracefully. openssl_pkey_new(), in particular, requires |
| 489 | * openssl.cnf be present somewhere and, unfortunately, the only real way to find out is too late. |
| 490 | * |
| 491 | * @return Crypt_RSA |
| 492 | * @access public |
| 493 | */ |
| 494 | function Crypt_RSA() |
| 495 | { |
| 496 | if (!class_exists('Math_BigInteger')) { |
| 497 | include_once 'Math/BigInteger.php'; |
| 498 | } |
| 499 | |
| 500 | $this->configFile = CRYPT_RSA_OPENSSL_CONFIG; |
| 501 | |
| 502 | if (!defined('CRYPT_RSA_MODE')) { |
| 503 | switch (true) { |
| 504 | // Math/BigInteger's openssl requirements are a little less stringent than Crypt/RSA's. in particular, |
| 505 | // Math/BigInteger doesn't require an openssl.cfg file whereas Crypt/RSA does. so if Math/BigInteger |
| 506 | // can't use OpenSSL it can be pretty trivially assumed, then, that Crypt/RSA can't either. |
| 507 | case defined('MATH_BIGINTEGER_OPENSSL_DISABLE'): |
| 508 | define('CRYPT_RSA_MODE', CRYPT_RSA_MODE_INTERNAL); |
| 509 | break; |
| 510 | // openssl_pkey_get_details - which is used in the only place Crypt/RSA.php uses OpenSSL - was introduced in PHP 5.2.0 |
| 511 | case !function_exists('openssl_pkey_get_details'): |
| 512 | define('CRYPT_RSA_MODE', CRYPT_RSA_MODE_INTERNAL); |
| 513 | break; |
| 514 | case extension_loaded('openssl') && version_compare(PHP_VERSION, '4.2.0', '>=') && file_exists($this->configFile): |
| 515 | // some versions of XAMPP have mismatched versions of OpenSSL which causes it not to work |
| 516 | ob_start(); |
| 517 | @phpinfo(); |
| 518 | $content = ob_get_contents(); |
| 519 | ob_end_clean(); |
| 520 | |
| 521 | preg_match_all('#OpenSSL (Header|Library) Version(.*)#im', $content, $matches); |
| 522 | |
| 523 | $versions = array(); |
| 524 | if (!empty($matches[1])) { |
| 525 | for ($i = 0; $i < count($matches[1]); $i++) { |
| 526 | $fullVersion = trim(str_replace('=>', '', strip_tags($matches[2][$i]))); |
| 527 | |
| 528 | // Remove letter part in OpenSSL version |
| 529 | if (!preg_match('/(\d+\.\d+\.\d+)/i', $fullVersion, $m)) { |
| 530 | $versions[$matches[1][$i]] = $fullVersion; |
| 531 | } else { |
| 532 | $versions[$matches[1][$i]] = $m[0]; |
| 533 | } |
| 534 | } |
| 535 | } |
| 536 | |
| 537 | // it doesn't appear that OpenSSL versions were reported upon until PHP 5.3+ |
| 538 | switch (true) { |
| 539 | case !isset($versions['Header']): |
| 540 | case !isset($versions['Library']): |
| 541 | case $versions['Header'] == $versions['Library']: |
| 542 | define('CRYPT_RSA_MODE', CRYPT_RSA_MODE_OPENSSL); |
| 543 | break; |
| 544 | default: |
| 545 | define('CRYPT_RSA_MODE', CRYPT_RSA_MODE_INTERNAL); |
| 546 | define('MATH_BIGINTEGER_OPENSSL_DISABLE', true); |
| 547 | } |
| 548 | break; |
| 549 | default: |
| 550 | define('CRYPT_RSA_MODE', CRYPT_RSA_MODE_INTERNAL); |
| 551 | } |
| 552 | } |
| 553 | |
| 554 | $this->zero = new Math_BigInteger(); |
| 555 | $this->one = new Math_BigInteger(1); |
| 556 | |
| 557 | $this->hash = new Crypt_Hash('sha1'); |
| 558 | $this->hLen = $this->hash->getLength(); |
| 559 | $this->hashName = 'sha1'; |
| 560 | $this->mgfHash = new Crypt_Hash('sha1'); |
| 561 | $this->mgfHLen = $this->mgfHash->getLength(); |
| 562 | } |
| 563 | |
| 564 | /** |
| 565 | * Create public / private key pair |
| 566 | * |
| 567 | * Returns an array with the following three elements: |
| 568 | * - 'privatekey': The private key. |
| 569 | * - 'publickey': The public key. |
| 570 | * - 'partialkey': A partially computed key (if the execution time exceeded $timeout). |
| 571 | * Will need to be passed back to Crypt_RSA::createKey() as the third parameter for further processing. |
| 572 | * |
| 573 | * @access public |
| 574 | * @param optional Integer $bits |
| 575 | * @param optional Integer $timeout |
| 576 | * @param optional Math_BigInteger $p |
| 577 | */ |
| 578 | function createKey($bits = 1024, $timeout = false, $partial = array()) |
| 579 | { |
| 580 | if (!defined('CRYPT_RSA_EXPONENT')) { |
| 581 | // http://en.wikipedia.org/wiki/65537_%28number%29 |
| 582 | define('CRYPT_RSA_EXPONENT', '65537'); |
| 583 | } |
| 584 | // per <http://cseweb.ucsd.edu/~hovav/dist/survey.pdf#page=5>, this number ought not result in primes smaller |
| 585 | // than 256 bits. as a consequence if the key you're trying to create is 1024 bits and you've set CRYPT_RSA_SMALLEST_PRIME |
| 586 | // to 384 bits then you're going to get a 384 bit prime and a 640 bit prime (384 + 1024 % 384). at least if |
| 587 | // CRYPT_RSA_MODE is set to CRYPT_RSA_MODE_INTERNAL. if CRYPT_RSA_MODE is set to CRYPT_RSA_MODE_OPENSSL then |
| 588 | // CRYPT_RSA_SMALLEST_PRIME is ignored (ie. multi-prime RSA support is more intended as a way to speed up RSA key |
| 589 | // generation when there's a chance neither gmp nor OpenSSL are installed) |
| 590 | if (!defined('CRYPT_RSA_SMALLEST_PRIME')) { |
| 591 | define('CRYPT_RSA_SMALLEST_PRIME', 4096); |
| 592 | } |
| 593 | |
| 594 | // OpenSSL uses 65537 as the exponent and requires RSA keys be 384 bits minimum |
| 595 | if (CRYPT_RSA_MODE == CRYPT_RSA_MODE_OPENSSL && $bits >= 384 && CRYPT_RSA_EXPONENT == 65537) { |
| 596 | $config = array(); |
| 597 | if (isset($this->configFile)) { |
| 598 | $config['config'] = $this->configFile; |
| 599 | } |
| 600 | $rsa = openssl_pkey_new(array('private_key_bits' => $bits) + $config); |
| 601 | openssl_pkey_export($rsa, $privatekey, null, $config); |
| 602 | $publickey = openssl_pkey_get_details($rsa); |
| 603 | $publickey = $publickey['key']; |
| 604 | |
| 605 | $privatekey = call_user_func_array(array($this, '_convertPrivateKey'), array_values($this->_parseKey($privatekey, CRYPT_RSA_PRIVATE_FORMAT_PKCS1))); |
| 606 | $publickey = call_user_func_array(array($this, '_convertPublicKey'), array_values($this->_parseKey($publickey, CRYPT_RSA_PUBLIC_FORMAT_PKCS1))); |
| 607 | |
| 608 | // clear the buffer of error strings stemming from a minimalistic openssl.cnf |
| 609 | while (openssl_error_string() !== false) { |
| 610 | } |
| 611 | |
| 612 | return array( |
| 613 | 'privatekey' => $privatekey, |
| 614 | 'publickey' => $publickey, |
| 615 | 'partialkey' => false |
| 616 | ); |
| 617 | } |
| 618 | |
| 619 | static $e; |
| 620 | if (!isset($e)) { |
| 621 | $e = new Math_BigInteger(CRYPT_RSA_EXPONENT); |
| 622 | } |
| 623 | |
| 624 | extract($this->_generateMinMax($bits)); |
| 625 | $absoluteMin = $min; |
| 626 | $temp = $bits >> 1; // divide by two to see how many bits P and Q would be |
| 627 | if ($temp > CRYPT_RSA_SMALLEST_PRIME) { |
| 628 | $num_primes = floor($bits / CRYPT_RSA_SMALLEST_PRIME); |
| 629 | $temp = CRYPT_RSA_SMALLEST_PRIME; |
| 630 | } else { |
| 631 | $num_primes = 2; |
| 632 | } |
| 633 | extract($this->_generateMinMax($temp + $bits % $temp)); |
| 634 | $finalMax = $max; |
| 635 | extract($this->_generateMinMax($temp)); |
| 636 | |
| 637 | $generator = new Math_BigInteger(); |
| 638 | |
| 639 | $n = $this->one->copy(); |
| 640 | if (!empty($partial)) { |
| 641 | extract(unserialize($partial)); |
| 642 | } else { |
| 643 | $exponents = $coefficients = $primes = array(); |
| 644 | $lcm = array( |
| 645 | 'top' => $this->one->copy(), |
| 646 | 'bottom' => false |
| 647 | ); |
| 648 | } |
| 649 | |
| 650 | $start = time(); |
| 651 | $i0 = count($primes) + 1; |
| 652 | |
| 653 | do { |
| 654 | for ($i = $i0; $i <= $num_primes; $i++) { |
| 655 | if ($timeout !== false) { |
| 656 | $timeout-= time() - $start; |
| 657 | $start = time(); |
| 658 | if ($timeout <= 0) { |
| 659 | return array( |
| 660 | 'privatekey' => '', |
| 661 | 'publickey' => '', |
| 662 | 'partialkey' => serialize(array( |
| 663 | 'primes' => $primes, |
| 664 | 'coefficients' => $coefficients, |
| 665 | 'lcm' => $lcm, |
| 666 | 'exponents' => $exponents |
| 667 | )) |
| 668 | ); |
| 669 | } |
| 670 | } |
| 671 | |
| 672 | if ($i == $num_primes) { |
| 673 | list($min, $temp) = $absoluteMin->divide($n); |
| 674 | if (!$temp->equals($this->zero)) { |
| 675 | $min = $min->add($this->one); // ie. ceil() |
| 676 | } |
| 677 | $primes[$i] = $generator->randomPrime($min, $finalMax, $timeout); |
| 678 | } else { |
| 679 | $primes[$i] = $generator->randomPrime($min, $max, $timeout); |
| 680 | } |
| 681 | |
| 682 | if ($primes[$i] === false) { // if we've reached the timeout |
| 683 | if (count($primes) > 1) { |
| 684 | $partialkey = ''; |
| 685 | } else { |
| 686 | array_pop($primes); |
| 687 | $partialkey = serialize(array( |
| 688 | 'primes' => $primes, |
| 689 | 'coefficients' => $coefficients, |
| 690 | 'lcm' => $lcm, |
| 691 | 'exponents' => $exponents |
| 692 | )); |
| 693 | } |
| 694 | |
| 695 | return array( |
| 696 | 'privatekey' => '', |
| 697 | 'publickey' => '', |
| 698 | 'partialkey' => $partialkey |
| 699 | ); |
| 700 | } |
| 701 | |
| 702 | // the first coefficient is calculated differently from the rest |
| 703 | // ie. instead of being $primes[1]->modInverse($primes[2]), it's $primes[2]->modInverse($primes[1]) |
| 704 | if ($i > 2) { |
| 705 | $coefficients[$i] = $n->modInverse($primes[$i]); |
| 706 | } |
| 707 | |
| 708 | $n = $n->multiply($primes[$i]); |
| 709 | |
| 710 | $temp = $primes[$i]->subtract($this->one); |
| 711 | |
| 712 | // textbook RSA implementations use Euler's totient function instead of the least common multiple. |
| 713 | // see http://en.wikipedia.org/wiki/Euler%27s_totient_function |
| 714 | $lcm['top'] = $lcm['top']->multiply($temp); |
| 715 | $lcm['bottom'] = $lcm['bottom'] === false ? $temp : $lcm['bottom']->gcd($temp); |
| 716 | |
| 717 | $exponents[$i] = $e->modInverse($temp); |
| 718 | } |
| 719 | |
| 720 | list($temp) = $lcm['top']->divide($lcm['bottom']); |
| 721 | $gcd = $temp->gcd($e); |
| 722 | $i0 = 1; |
| 723 | } while (!$gcd->equals($this->one)); |
| 724 | |
| 725 | $d = $e->modInverse($temp); |
| 726 | |
| 727 | $coefficients[2] = $primes[2]->modInverse($primes[1]); |
| 728 | |
| 729 | // from <http://tools.ietf.org/html/rfc3447#appendix-A.1.2>: |
| 730 | // RSAPrivateKey ::= SEQUENCE { |
| 731 | // version Version, |
| 732 | // modulus INTEGER, -- n |
| 733 | // publicExponent INTEGER, -- e |
| 734 | // privateExponent INTEGER, -- d |
| 735 | // prime1 INTEGER, -- p |
| 736 | // prime2 INTEGER, -- q |
| 737 | // exponent1 INTEGER, -- d mod (p-1) |
| 738 | // exponent2 INTEGER, -- d mod (q-1) |
| 739 | // coefficient INTEGER, -- (inverse of q) mod p |
| 740 | // otherPrimeInfos OtherPrimeInfos OPTIONAL |
| 741 | // } |
| 742 | |
| 743 | return array( |
| 744 | 'privatekey' => $this->_convertPrivateKey($n, $e, $d, $primes, $exponents, $coefficients), |
| 745 | 'publickey' => $this->_convertPublicKey($n, $e), |
| 746 | 'partialkey' => false |
| 747 | ); |
| 748 | } |
| 749 | |
| 750 | /** |
| 751 | * Convert a private key to the appropriate format. |
| 752 | * |
| 753 | * @access private |
| 754 | * @see setPrivateKeyFormat() |
| 755 | * @param String $RSAPrivateKey |
| 756 | * @return String |
| 757 | */ |
| 758 | function _convertPrivateKey($n, $e, $d, $primes, $exponents, $coefficients) |
| 759 | { |
| 760 | $signed = $this->privateKeyFormat != CRYPT_RSA_PRIVATE_FORMAT_XML; |
| 761 | $num_primes = count($primes); |
| 762 | $raw = array( |
| 763 | 'version' => $num_primes == 2 ? chr(0) : chr(1), // two-prime vs. multi |
| 764 | 'modulus' => $n->toBytes($signed), |
| 765 | 'publicExponent' => $e->toBytes($signed), |
| 766 | 'privateExponent' => $d->toBytes($signed), |
| 767 | 'prime1' => $primes[1]->toBytes($signed), |
| 768 | 'prime2' => $primes[2]->toBytes($signed), |
| 769 | 'exponent1' => $exponents[1]->toBytes($signed), |
| 770 | 'exponent2' => $exponents[2]->toBytes($signed), |
| 771 | 'coefficient' => $coefficients[2]->toBytes($signed) |
| 772 | ); |
| 773 | |
| 774 | // if the format in question does not support multi-prime rsa and multi-prime rsa was used, |
| 775 | // call _convertPublicKey() instead. |
| 776 | switch ($this->privateKeyFormat) { |
| 777 | case CRYPT_RSA_PRIVATE_FORMAT_XML: |
| 778 | if ($num_primes != 2) { |
| 779 | return false; |
| 780 | } |
| 781 | return "<RSAKeyValue>\r\n" . |
| 782 | ' <Modulus>' . base64_encode($raw['modulus']) . "</Modulus>\r\n" . |
| 783 | ' <Exponent>' . base64_encode($raw['publicExponent']) . "</Exponent>\r\n" . |
| 784 | ' <P>' . base64_encode($raw['prime1']) . "</P>\r\n" . |
| 785 | ' <Q>' . base64_encode($raw['prime2']) . "</Q>\r\n" . |
| 786 | ' <DP>' . base64_encode($raw['exponent1']) . "</DP>\r\n" . |
| 787 | ' <DQ>' . base64_encode($raw['exponent2']) . "</DQ>\r\n" . |
| 788 | ' <InverseQ>' . base64_encode($raw['coefficient']) . "</InverseQ>\r\n" . |
| 789 | ' <D>' . base64_encode($raw['privateExponent']) . "</D>\r\n" . |
| 790 | '</RSAKeyValue>'; |
| 791 | break; |
| 792 | case CRYPT_RSA_PRIVATE_FORMAT_PUTTY: |
| 793 | if ($num_primes != 2) { |
| 794 | return false; |
| 795 | } |
| 796 | $key = "PuTTY-User-Key-File-2: ssh-rsa\r\nEncryption: "; |
| 797 | $encryption = (!empty($this->password) || is_string($this->password)) ? 'aes256-cbc' : 'none'; |
| 798 | $key.= $encryption; |
| 799 | $key.= "\r\nComment: " . $this->comment . "\r\n"; |
| 800 | $public = pack( |
| 801 | 'Na*Na*Na*', |
| 802 | strlen('ssh-rsa'), |
| 803 | 'ssh-rsa', |
| 804 | strlen($raw['publicExponent']), |
| 805 | $raw['publicExponent'], |
| 806 | strlen($raw['modulus']), |
| 807 | $raw['modulus'] |
| 808 | ); |
| 809 | $source = pack( |
| 810 | 'Na*Na*Na*Na*', |
| 811 | strlen('ssh-rsa'), |
| 812 | 'ssh-rsa', |
| 813 | strlen($encryption), |
| 814 | $encryption, |
| 815 | strlen($this->comment), |
| 816 | $this->comment, |
| 817 | strlen($public), |
| 818 | $public |
| 819 | ); |
| 820 | $public = base64_encode($public); |
| 821 | $key.= "Public-Lines: " . ((strlen($public) + 63) >> 6) . "\r\n"; |
| 822 | $key.= chunk_split($public, 64); |
| 823 | $private = pack( |
| 824 | 'Na*Na*Na*Na*', |
| 825 | strlen($raw['privateExponent']), |
| 826 | $raw['privateExponent'], |
| 827 | strlen($raw['prime1']), |
| 828 | $raw['prime1'], |
| 829 | strlen($raw['prime2']), |
| 830 | $raw['prime2'], |
| 831 | strlen($raw['coefficient']), |
| 832 | $raw['coefficient'] |
| 833 | ); |
| 834 | if (empty($this->password) && !is_string($this->password)) { |
| 835 | $source.= pack('Na*', strlen($private), $private); |
| 836 | $hashkey = 'putty-private-key-file-mac-key'; |
| 837 | } else { |
| 838 | $private.= crypt_random_string(16 - (strlen($private) & 15)); |
| 839 | $source.= pack('Na*', strlen($private), $private); |
| 840 | if (!class_exists('Crypt_AES')) { |
| 841 | include_once 'Crypt/AES.php'; |
| 842 | } |
| 843 | $sequence = 0; |
| 844 | $symkey = ''; |
| 845 | while (strlen($symkey) < 32) { |
| 846 | $temp = pack('Na*', $sequence++, $this->password); |
| 847 | $symkey.= pack('H*', sha1($temp)); |
| 848 | } |
| 849 | $symkey = substr($symkey, 0, 32); |
| 850 | $crypto = new Crypt_AES(); |
| 851 | |
| 852 | $crypto->setKey($symkey); |
| 853 | $crypto->disablePadding(); |
| 854 | $private = $crypto->encrypt($private); |
| 855 | $hashkey = 'putty-private-key-file-mac-key' . $this->password; |
| 856 | } |
| 857 | |
| 858 | $private = base64_encode($private); |
| 859 | $key.= 'Private-Lines: ' . ((strlen($private) + 63) >> 6) . "\r\n"; |
| 860 | $key.= chunk_split($private, 64); |
| 861 | if (!class_exists('Crypt_Hash')) { |
| 862 | include_once 'Crypt/Hash.php'; |
| 863 | } |
| 864 | $hash = new Crypt_Hash('sha1'); |
| 865 | $hash->setKey(pack('H*', sha1($hashkey))); |
| 866 | $key.= 'Private-MAC: ' . bin2hex($hash->hash($source)) . "\r\n"; |
| 867 | |
| 868 | return $key; |
| 869 | default: // eg. CRYPT_RSA_PRIVATE_FORMAT_PKCS1 |
| 870 | $components = array(); |
| 871 | foreach ($raw as $name => $value) { |
| 872 | $components[$name] = pack('Ca*a*', CRYPT_RSA_ASN1_INTEGER, $this->_encodeLength(strlen($value)), $value); |
| 873 | } |
| 874 | |
| 875 | $RSAPrivateKey = implode('', $components); |
| 876 | |
| 877 | if ($num_primes > 2) { |
| 878 | $OtherPrimeInfos = ''; |
| 879 | for ($i = 3; $i <= $num_primes; $i++) { |
| 880 | // OtherPrimeInfos ::= SEQUENCE SIZE(1..MAX) OF OtherPrimeInfo |
| 881 | // |
| 882 | // OtherPrimeInfo ::= SEQUENCE { |
| 883 | // prime INTEGER, -- ri |
| 884 | // exponent INTEGER, -- di |
| 885 | // coefficient INTEGER -- ti |
| 886 | // } |
| 887 | $OtherPrimeInfo = pack('Ca*a*', CRYPT_RSA_ASN1_INTEGER, $this->_encodeLength(strlen($primes[$i]->toBytes(true))), $primes[$i]->toBytes(true)); |
| 888 | $OtherPrimeInfo.= pack('Ca*a*', CRYPT_RSA_ASN1_INTEGER, $this->_encodeLength(strlen($exponents[$i]->toBytes(true))), $exponents[$i]->toBytes(true)); |
| 889 | $OtherPrimeInfo.= pack('Ca*a*', CRYPT_RSA_ASN1_INTEGER, $this->_encodeLength(strlen($coefficients[$i]->toBytes(true))), $coefficients[$i]->toBytes(true)); |
| 890 | $OtherPrimeInfos.= pack('Ca*a*', CRYPT_RSA_ASN1_SEQUENCE, $this->_encodeLength(strlen($OtherPrimeInfo)), $OtherPrimeInfo); |
| 891 | } |
| 892 | $RSAPrivateKey.= pack('Ca*a*', CRYPT_RSA_ASN1_SEQUENCE, $this->_encodeLength(strlen($OtherPrimeInfos)), $OtherPrimeInfos); |
| 893 | } |
| 894 | |
| 895 | $RSAPrivateKey = pack('Ca*a*', CRYPT_RSA_ASN1_SEQUENCE, $this->_encodeLength(strlen($RSAPrivateKey)), $RSAPrivateKey); |
| 896 | |
| 897 | if ($this->privateKeyFormat == CRYPT_RSA_PRIVATE_FORMAT_PKCS8) { |
| 898 | $rsaOID = pack('H*', '300d06092a864886f70d0101010500'); // hex version of MA0GCSqGSIb3DQEBAQUA |
| 899 | $RSAPrivateKey = pack( |
| 900 | 'Ca*a*Ca*a*', |
| 901 | CRYPT_RSA_ASN1_INTEGER, |
| 902 | "\01\00", |
| 903 | $rsaOID, |
| 904 | 4, |
| 905 | $this->_encodeLength(strlen($RSAPrivateKey)), |
| 906 | $RSAPrivateKey |
| 907 | ); |
| 908 | $RSAPrivateKey = pack('Ca*a*', CRYPT_RSA_ASN1_SEQUENCE, $this->_encodeLength(strlen($RSAPrivateKey)), $RSAPrivateKey); |
| 909 | if (!empty($this->password) || is_string($this->password)) { |
| 910 | $salt = crypt_random_string(8); |
| 911 | $iterationCount = 2048; |
| 912 | |
| 913 | if (!class_exists('Crypt_DES')) { |
| 914 | include_once 'Crypt/DES.php'; |
| 915 | } |
| 916 | $crypto = new Crypt_DES(); |
| 917 | $crypto->setPassword($this->password, 'pbkdf1', 'md5', $salt, $iterationCount); |
| 918 | $RSAPrivateKey = $crypto->encrypt($RSAPrivateKey); |
| 919 | |
| 920 | $parameters = pack( |
| 921 | 'Ca*a*Ca*N', |
| 922 | CRYPT_RSA_ASN1_OCTETSTRING, |
| 923 | $this->_encodeLength(strlen($salt)), |
| 924 | $salt, |
| 925 | CRYPT_RSA_ASN1_INTEGER, |
| 926 | $this->_encodeLength(4), |
| 927 | $iterationCount |
| 928 | ); |
| 929 | $pbeWithMD5AndDES_CBC = "\x2a\x86\x48\x86\xf7\x0d\x01\x05\x03"; |
| 930 | |
| 931 | $encryptionAlgorithm = pack( |
| 932 | 'Ca*a*Ca*a*', |
| 933 | CRYPT_RSA_ASN1_OBJECT, |
| 934 | $this->_encodeLength(strlen($pbeWithMD5AndDES_CBC)), |
| 935 | $pbeWithMD5AndDES_CBC, |
| 936 | CRYPT_RSA_ASN1_SEQUENCE, |
| 937 | $this->_encodeLength(strlen($parameters)), |
| 938 | $parameters |
| 939 | ); |
| 940 | |
| 941 | $RSAPrivateKey = pack( |
| 942 | 'Ca*a*Ca*a*', |
| 943 | CRYPT_RSA_ASN1_SEQUENCE, |
| 944 | $this->_encodeLength(strlen($encryptionAlgorithm)), |
| 945 | $encryptionAlgorithm, |
| 946 | CRYPT_RSA_ASN1_OCTETSTRING, |
| 947 | $this->_encodeLength(strlen($RSAPrivateKey)), |
| 948 | $RSAPrivateKey |
| 949 | ); |
| 950 | |
| 951 | $RSAPrivateKey = pack('Ca*a*', CRYPT_RSA_ASN1_SEQUENCE, $this->_encodeLength(strlen($RSAPrivateKey)), $RSAPrivateKey); |
| 952 | |
| 953 | $RSAPrivateKey = "-----BEGIN ENCRYPTED PRIVATE KEY-----\r\n" . |
| 954 | chunk_split(base64_encode($RSAPrivateKey), 64) . |
| 955 | '-----END ENCRYPTED PRIVATE KEY-----'; |
| 956 | } else { |
| 957 | $RSAPrivateKey = "-----BEGIN PRIVATE KEY-----\r\n" . |
| 958 | chunk_split(base64_encode($RSAPrivateKey), 64) . |
| 959 | '-----END PRIVATE KEY-----'; |
| 960 | } |
| 961 | return $RSAPrivateKey; |
| 962 | } |
| 963 | |
| 964 | if (!empty($this->password) || is_string($this->password)) { |
| 965 | $iv = crypt_random_string(8); |
| 966 | $symkey = pack('H*', md5($this->password . $iv)); // symkey is short for symmetric key |
| 967 | $symkey.= substr(pack('H*', md5($symkey . $this->password . $iv)), 0, 8); |
| 968 | if (!class_exists('Crypt_TripleDES')) { |
| 969 | include_once 'Crypt/TripleDES.php'; |
| 970 | } |
| 971 | $des = new Crypt_TripleDES(); |
| 972 | $des->setKey($symkey); |
| 973 | $des->setIV($iv); |
| 974 | $iv = strtoupper(bin2hex($iv)); |
| 975 | $RSAPrivateKey = "-----BEGIN RSA PRIVATE KEY-----\r\n" . |
| 976 | "Proc-Type: 4,ENCRYPTED\r\n" . |
| 977 | "DEK-Info: DES-EDE3-CBC,$iv\r\n" . |
| 978 | "\r\n" . |
| 979 | chunk_split(base64_encode($des->encrypt($RSAPrivateKey)), 64) . |
| 980 | '-----END RSA PRIVATE KEY-----'; |
| 981 | } else { |
| 982 | $RSAPrivateKey = "-----BEGIN RSA PRIVATE KEY-----\r\n" . |
| 983 | chunk_split(base64_encode($RSAPrivateKey), 64) . |
| 984 | '-----END RSA PRIVATE KEY-----'; |
| 985 | } |
| 986 | |
| 987 | return $RSAPrivateKey; |
| 988 | } |
| 989 | } |
| 990 | |
| 991 | /** |
| 992 | * Convert a public key to the appropriate format |
| 993 | * |
| 994 | * @access private |
| 995 | * @see setPublicKeyFormat() |
| 996 | * @param String $RSAPrivateKey |
| 997 | * @return String |
| 998 | */ |
| 999 | function _convertPublicKey($n, $e) |
| 1000 | { |
| 1001 | $signed = $this->publicKeyFormat != CRYPT_RSA_PUBLIC_FORMAT_XML; |
| 1002 | |
| 1003 | $modulus = $n->toBytes($signed); |
| 1004 | $publicExponent = $e->toBytes($signed); |
| 1005 | |
| 1006 | switch ($this->publicKeyFormat) { |
| 1007 | case CRYPT_RSA_PUBLIC_FORMAT_RAW: |
| 1008 | return array('e' => $e->copy(), 'n' => $n->copy()); |
| 1009 | case CRYPT_RSA_PUBLIC_FORMAT_XML: |
| 1010 | return "<RSAKeyValue>\r\n" . |
| 1011 | ' <Modulus>' . base64_encode($modulus) . "</Modulus>\r\n" . |
| 1012 | ' <Exponent>' . base64_encode($publicExponent) . "</Exponent>\r\n" . |
| 1013 | '</RSAKeyValue>'; |
| 1014 | break; |
| 1015 | case CRYPT_RSA_PUBLIC_FORMAT_OPENSSH: |
| 1016 | // from <http://tools.ietf.org/html/rfc4253#page-15>: |
| 1017 | // string "ssh-rsa" |
| 1018 | // mpint e |
| 1019 | // mpint n |
| 1020 | $RSAPublicKey = pack('Na*Na*Na*', strlen('ssh-rsa'), 'ssh-rsa', strlen($publicExponent), $publicExponent, strlen($modulus), $modulus); |
| 1021 | $RSAPublicKey = 'ssh-rsa ' . base64_encode($RSAPublicKey) . ' ' . $this->comment; |
| 1022 | |
| 1023 | return $RSAPublicKey; |
| 1024 | default: // eg. CRYPT_RSA_PUBLIC_FORMAT_PKCS1_RAW or CRYPT_RSA_PUBLIC_FORMAT_PKCS1 |
| 1025 | // from <http://tools.ietf.org/html/rfc3447#appendix-A.1.1>: |
| 1026 | // RSAPublicKey ::= SEQUENCE { |
| 1027 | // modulus INTEGER, -- n |
| 1028 | // publicExponent INTEGER -- e |
| 1029 | // } |
| 1030 | $components = array( |
| 1031 | 'modulus' => pack('Ca*a*', CRYPT_RSA_ASN1_INTEGER, $this->_encodeLength(strlen($modulus)), $modulus), |
| 1032 | 'publicExponent' => pack('Ca*a*', CRYPT_RSA_ASN1_INTEGER, $this->_encodeLength(strlen($publicExponent)), $publicExponent) |
| 1033 | ); |
| 1034 | |
| 1035 | $RSAPublicKey = pack( |
| 1036 | 'Ca*a*a*', |
| 1037 | CRYPT_RSA_ASN1_SEQUENCE, |
| 1038 | $this->_encodeLength(strlen($components['modulus']) + strlen($components['publicExponent'])), |
| 1039 | $components['modulus'], |
| 1040 | $components['publicExponent'] |
| 1041 | ); |
| 1042 | |
| 1043 | if ($this->publicKeyFormat == CRYPT_RSA_PUBLIC_FORMAT_PKCS1_RAW) { |
| 1044 | $RSAPublicKey = "-----BEGIN RSA PUBLIC KEY-----\r\n" . |
| 1045 | chunk_split(base64_encode($RSAPublicKey), 64) . |
| 1046 | '-----END RSA PUBLIC KEY-----'; |
| 1047 | } else { |
| 1048 | // sequence(oid(1.2.840.113549.1.1.1), null)) = rsaEncryption. |
| 1049 | $rsaOID = pack('H*', '300d06092a864886f70d0101010500'); // hex version of MA0GCSqGSIb3DQEBAQUA |
| 1050 | $RSAPublicKey = chr(0) . $RSAPublicKey; |
| 1051 | $RSAPublicKey = chr(3) . $this->_encodeLength(strlen($RSAPublicKey)) . $RSAPublicKey; |
| 1052 | |
| 1053 | $RSAPublicKey = pack( |
| 1054 | 'Ca*a*', |
| 1055 | CRYPT_RSA_ASN1_SEQUENCE, |
| 1056 | $this->_encodeLength(strlen($rsaOID . $RSAPublicKey)), |
| 1057 | $rsaOID . $RSAPublicKey |
| 1058 | ); |
| 1059 | |
| 1060 | $RSAPublicKey = "-----BEGIN PUBLIC KEY-----\r\n" . |
| 1061 | chunk_split(base64_encode($RSAPublicKey), 64) . |
| 1062 | '-----END PUBLIC KEY-----'; |
| 1063 | } |
| 1064 | |
| 1065 | return $RSAPublicKey; |
| 1066 | } |
| 1067 | } |
| 1068 | |
| 1069 | /** |
| 1070 | * Break a public or private key down into its constituant components |
| 1071 | * |
| 1072 | * @access private |
| 1073 | * @see _convertPublicKey() |
| 1074 | * @see _convertPrivateKey() |
| 1075 | * @param String $key |
| 1076 | * @param Integer $type |
| 1077 | * @return Array |
| 1078 | */ |
| 1079 | function _parseKey($key, $type) |
| 1080 | { |
| 1081 | if ($type != CRYPT_RSA_PUBLIC_FORMAT_RAW && !is_string($key)) { |
| 1082 | return false; |
| 1083 | } |
| 1084 | |
| 1085 | switch ($type) { |
| 1086 | case CRYPT_RSA_PUBLIC_FORMAT_RAW: |
| 1087 | if (!is_array($key)) { |
| 1088 | return false; |
| 1089 | } |
| 1090 | $components = array(); |
| 1091 | switch (true) { |
| 1092 | case isset($key['e']): |
| 1093 | $components['publicExponent'] = $key['e']->copy(); |
| 1094 | break; |
| 1095 | case isset($key['exponent']): |
| 1096 | $components['publicExponent'] = $key['exponent']->copy(); |
| 1097 | break; |
| 1098 | case isset($key['publicExponent']): |
| 1099 | $components['publicExponent'] = $key['publicExponent']->copy(); |
| 1100 | break; |
| 1101 | case isset($key[0]): |
| 1102 | $components['publicExponent'] = $key[0]->copy(); |
| 1103 | } |
| 1104 | switch (true) { |
| 1105 | case isset($key['n']): |
| 1106 | $components['modulus'] = $key['n']->copy(); |
| 1107 | break; |
| 1108 | case isset($key['modulo']): |
| 1109 | $components['modulus'] = $key['modulo']->copy(); |
| 1110 | break; |
| 1111 | case isset($key['modulus']): |
| 1112 | $components['modulus'] = $key['modulus']->copy(); |
| 1113 | break; |
| 1114 | case isset($key[1]): |
| 1115 | $components['modulus'] = $key[1]->copy(); |
| 1116 | } |
| 1117 | return isset($components['modulus']) && isset($components['publicExponent']) ? $components : false; |
| 1118 | case CRYPT_RSA_PRIVATE_FORMAT_PKCS1: |
| 1119 | case CRYPT_RSA_PRIVATE_FORMAT_PKCS8: |
| 1120 | case CRYPT_RSA_PUBLIC_FORMAT_PKCS1: |
| 1121 | /* Although PKCS#1 proposes a format that public and private keys can use, encrypting them is |
| 1122 | "outside the scope" of PKCS#1. PKCS#1 then refers you to PKCS#12 and PKCS#15 if you're wanting to |
| 1123 | protect private keys, however, that's not what OpenSSL* does. OpenSSL protects private keys by adding |
| 1124 | two new "fields" to the key - DEK-Info and Proc-Type. These fields are discussed here: |
| 1125 | |
| 1126 | http://tools.ietf.org/html/rfc1421#section-4.6.1.1 |
| 1127 | http://tools.ietf.org/html/rfc1421#section-4.6.1.3 |
| 1128 | |
| 1129 | DES-EDE3-CBC as an algorithm, however, is not discussed anywhere, near as I can tell. |
| 1130 | DES-CBC and DES-EDE are discussed in RFC1423, however, DES-EDE3-CBC isn't, nor is its key derivation |
| 1131 | function. As is, the definitive authority on this encoding scheme isn't the IETF but rather OpenSSL's |
| 1132 | own implementation. ie. the implementation *is* the standard and any bugs that may exist in that |
| 1133 | implementation are part of the standard, as well. |
| 1134 | |
| 1135 | * OpenSSL is the de facto standard. It's utilized by OpenSSH and other projects */ |
| 1136 | if (preg_match('#DEK-Info: (.+),(.+)#', $key, $matches)) { |
| 1137 | $iv = pack('H*', trim($matches[2])); |
| 1138 | $symkey = pack('H*', md5($this->password . substr($iv, 0, 8))); // symkey is short for symmetric key |
| 1139 | $symkey.= pack('H*', md5($symkey . $this->password . substr($iv, 0, 8))); |
| 1140 | // remove the Proc-Type / DEK-Info sections as they're no longer needed |
| 1141 | $key = preg_replace('#^(?:Proc-Type|DEK-Info): .*#m', '', $key); |
| 1142 | $ciphertext = $this->_extractBER($key); |
| 1143 | if ($ciphertext === false) { |
| 1144 | $ciphertext = $key; |
| 1145 | } |
| 1146 | switch ($matches[1]) { |
| 1147 | case 'AES-256-CBC': |
| 1148 | if (!class_exists('Crypt_AES')) { |
| 1149 | include_once 'Crypt/AES.php'; |
| 1150 | } |
| 1151 | $crypto = new Crypt_AES(); |
| 1152 | break; |
| 1153 | case 'AES-128-CBC': |
| 1154 | if (!class_exists('Crypt_AES')) { |
| 1155 | include_once 'Crypt/AES.php'; |
| 1156 | } |
| 1157 | $symkey = substr($symkey, 0, 16); |
| 1158 | $crypto = new Crypt_AES(); |
| 1159 | break; |
| 1160 | case 'DES-EDE3-CFB': |
| 1161 | if (!class_exists('Crypt_TripleDES')) { |
| 1162 | include_once 'Crypt/TripleDES.php'; |
| 1163 | } |
| 1164 | $crypto = new Crypt_TripleDES(CRYPT_DES_MODE_CFB); |
| 1165 | break; |
| 1166 | case 'DES-EDE3-CBC': |
| 1167 | if (!class_exists('Crypt_TripleDES')) { |
| 1168 | include_once 'Crypt/TripleDES.php'; |
| 1169 | } |
| 1170 | $symkey = substr($symkey, 0, 24); |
| 1171 | $crypto = new Crypt_TripleDES(); |
| 1172 | break; |
| 1173 | case 'DES-CBC': |
| 1174 | if (!class_exists('Crypt_DES')) { |
| 1175 | include_once 'Crypt/DES.php'; |
| 1176 | } |
| 1177 | $crypto = new Crypt_DES(); |
| 1178 | break; |
| 1179 | default: |
| 1180 | return false; |
| 1181 | } |
| 1182 | $crypto->setKey($symkey); |
| 1183 | $crypto->setIV($iv); |
| 1184 | $decoded = $crypto->decrypt($ciphertext); |
| 1185 | } else { |
| 1186 | $decoded = $this->_extractBER($key); |
| 1187 | } |
| 1188 | |
| 1189 | if ($decoded !== false) { |
| 1190 | $key = $decoded; |
| 1191 | } |
| 1192 | |
| 1193 | $components = array(); |
| 1194 | |
| 1195 | if (ord($this->_string_shift($key)) != CRYPT_RSA_ASN1_SEQUENCE) { |
| 1196 | return false; |
| 1197 | } |
| 1198 | if ($this->_decodeLength($key) != strlen($key)) { |
| 1199 | return false; |
| 1200 | } |
| 1201 | |
| 1202 | $tag = ord($this->_string_shift($key)); |
| 1203 | /* intended for keys for which OpenSSL's asn1parse returns the following: |
| 1204 | |
| 1205 | 0:d=0 hl=4 l= 631 cons: SEQUENCE |
| 1206 | 4:d=1 hl=2 l= 1 prim: INTEGER :00 |
| 1207 | 7:d=1 hl=2 l= 13 cons: SEQUENCE |
| 1208 | 9:d=2 hl=2 l= 9 prim: OBJECT :rsaEncryption |
| 1209 | 20:d=2 hl=2 l= 0 prim: NULL |
| 1210 | 22:d=1 hl=4 l= 609 prim: OCTET STRING |
| 1211 | |
| 1212 | ie. PKCS8 keys*/ |
| 1213 | |
| 1214 | if ($tag == CRYPT_RSA_ASN1_INTEGER && substr($key, 0, 3) == "\x01\x00\x30") { |
| 1215 | $this->_string_shift($key, 3); |
| 1216 | $tag = CRYPT_RSA_ASN1_SEQUENCE; |
| 1217 | } |
| 1218 | |
| 1219 | if ($tag == CRYPT_RSA_ASN1_SEQUENCE) { |
| 1220 | $temp = $this->_string_shift($key, $this->_decodeLength($key)); |
| 1221 | if (ord($this->_string_shift($temp)) != CRYPT_RSA_ASN1_OBJECT) { |
| 1222 | return false; |
| 1223 | } |
| 1224 | $length = $this->_decodeLength($temp); |
| 1225 | switch ($this->_string_shift($temp, $length)) { |
| 1226 | case "\x2a\x86\x48\x86\xf7\x0d\x01\x01\x01": // rsaEncryption |
| 1227 | break; |
| 1228 | case "\x2a\x86\x48\x86\xf7\x0d\x01\x05\x03": // pbeWithMD5AndDES-CBC |
| 1229 | /* |
| 1230 | PBEParameter ::= SEQUENCE { |
| 1231 | salt OCTET STRING (SIZE(8)), |
| 1232 | iterationCount INTEGER } |
| 1233 | */ |
| 1234 | if (ord($this->_string_shift($temp)) != CRYPT_RSA_ASN1_SEQUENCE) { |
| 1235 | return false; |
| 1236 | } |
| 1237 | if ($this->_decodeLength($temp) != strlen($temp)) { |
| 1238 | return false; |
| 1239 | } |
| 1240 | $this->_string_shift($temp); // assume it's an octet string |
| 1241 | $salt = $this->_string_shift($temp, $this->_decodeLength($temp)); |
| 1242 | if (ord($this->_string_shift($temp)) != CRYPT_RSA_ASN1_INTEGER) { |
| 1243 | return false; |
| 1244 | } |
| 1245 | $this->_decodeLength($temp); |
| 1246 | list(, $iterationCount) = unpack('N', str_pad($temp, 4, chr(0), STR_PAD_LEFT)); |
| 1247 | $this->_string_shift($key); // assume it's an octet string |
| 1248 | $length = $this->_decodeLength($key); |
| 1249 | if (strlen($key) != $length) { |
| 1250 | return false; |
| 1251 | } |
| 1252 | |
| 1253 | if (!class_exists('Crypt_DES')) { |
| 1254 | include_once 'Crypt/DES.php'; |
| 1255 | } |
| 1256 | $crypto = new Crypt_DES(); |
| 1257 | $crypto->setPassword($this->password, 'pbkdf1', 'md5', $salt, $iterationCount); |
| 1258 | $key = $crypto->decrypt($key); |
| 1259 | if ($key === false) { |
| 1260 | return false; |
| 1261 | } |
| 1262 | return $this->_parseKey($key, CRYPT_RSA_PRIVATE_FORMAT_PKCS1); |
| 1263 | default: |
| 1264 | return false; |
| 1265 | } |
| 1266 | /* intended for keys for which OpenSSL's asn1parse returns the following: |
| 1267 | |
| 1268 | 0:d=0 hl=4 l= 290 cons: SEQUENCE |
| 1269 | 4:d=1 hl=2 l= 13 cons: SEQUENCE |
| 1270 | 6:d=2 hl=2 l= 9 prim: OBJECT :rsaEncryption |
| 1271 | 17:d=2 hl=2 l= 0 prim: NULL |
| 1272 | 19:d=1 hl=4 l= 271 prim: BIT STRING */ |
| 1273 | $tag = ord($this->_string_shift($key)); // skip over the BIT STRING / OCTET STRING tag |
| 1274 | $this->_decodeLength($key); // skip over the BIT STRING / OCTET STRING length |
| 1275 | // "The initial octet shall encode, as an unsigned binary integer wtih bit 1 as the least significant bit, the number of |
| 1276 | // unused bits in the final subsequent octet. The number shall be in the range zero to seven." |
| 1277 | // -- http://www.itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf (section 8.6.2.2) |
| 1278 | if ($tag == CRYPT_RSA_ASN1_BITSTRING) { |
| 1279 | $this->_string_shift($key); |
| 1280 | } |
| 1281 | if (ord($this->_string_shift($key)) != CRYPT_RSA_ASN1_SEQUENCE) { |
| 1282 | return false; |
| 1283 | } |
| 1284 | if ($this->_decodeLength($key) != strlen($key)) { |
| 1285 | return false; |
| 1286 | } |
| 1287 | $tag = ord($this->_string_shift($key)); |
| 1288 | } |
| 1289 | if ($tag != CRYPT_RSA_ASN1_INTEGER) { |
| 1290 | return false; |
| 1291 | } |
| 1292 | |
| 1293 | $length = $this->_decodeLength($key); |
| 1294 | $temp = $this->_string_shift($key, $length); |
| 1295 | if (strlen($temp) != 1 || ord($temp) > 2) { |
| 1296 | $components['modulus'] = new Math_BigInteger($temp, 256); |
| 1297 | $this->_string_shift($key); // skip over CRYPT_RSA_ASN1_INTEGER |
| 1298 | $length = $this->_decodeLength($key); |
| 1299 | $components[$type == CRYPT_RSA_PUBLIC_FORMAT_PKCS1 ? 'publicExponent' : 'privateExponent'] = new Math_BigInteger($this->_string_shift($key, $length), 256); |
| 1300 | |
| 1301 | return $components; |
| 1302 | } |
| 1303 | if (ord($this->_string_shift($key)) != CRYPT_RSA_ASN1_INTEGER) { |
| 1304 | return false; |
| 1305 | } |
| 1306 | $length = $this->_decodeLength($key); |
| 1307 | $components['modulus'] = new Math_BigInteger($this->_string_shift($key, $length), 256); |
| 1308 | $this->_string_shift($key); |
| 1309 | $length = $this->_decodeLength($key); |
| 1310 | $components['publicExponent'] = new Math_BigInteger($this->_string_shift($key, $length), 256); |
| 1311 | $this->_string_shift($key); |
| 1312 | $length = $this->_decodeLength($key); |
| 1313 | $components['privateExponent'] = new Math_BigInteger($this->_string_shift($key, $length), 256); |
| 1314 | $this->_string_shift($key); |
| 1315 | $length = $this->_decodeLength($key); |
| 1316 | $components['primes'] = array(1 => new Math_BigInteger($this->_string_shift($key, $length), 256)); |
| 1317 | $this->_string_shift($key); |
| 1318 | $length = $this->_decodeLength($key); |
| 1319 | $components['primes'][] = new Math_BigInteger($this->_string_shift($key, $length), 256); |
| 1320 | $this->_string_shift($key); |
| 1321 | $length = $this->_decodeLength($key); |
| 1322 | $components['exponents'] = array(1 => new Math_BigInteger($this->_string_shift($key, $length), 256)); |
| 1323 | $this->_string_shift($key); |
| 1324 | $length = $this->_decodeLength($key); |
| 1325 | $components['exponents'][] = new Math_BigInteger($this->_string_shift($key, $length), 256); |
| 1326 | $this->_string_shift($key); |
| 1327 | $length = $this->_decodeLength($key); |
| 1328 | $components['coefficients'] = array(2 => new Math_BigInteger($this->_string_shift($key, $length), 256)); |
| 1329 | |
| 1330 | if (!empty($key)) { |
| 1331 | if (ord($this->_string_shift($key)) != CRYPT_RSA_ASN1_SEQUENCE) { |
| 1332 | return false; |
| 1333 | } |
| 1334 | $this->_decodeLength($key); |
| 1335 | while (!empty($key)) { |
| 1336 | if (ord($this->_string_shift($key)) != CRYPT_RSA_ASN1_SEQUENCE) { |
| 1337 | return false; |
| 1338 | } |
| 1339 | $this->_decodeLength($key); |
| 1340 | $key = substr($key, 1); |
| 1341 | $length = $this->_decodeLength($key); |
| 1342 | $components['primes'][] = new Math_BigInteger($this->_string_shift($key, $length), 256); |
| 1343 | $this->_string_shift($key); |
| 1344 | $length = $this->_decodeLength($key); |
| 1345 | $components['exponents'][] = new Math_BigInteger($this->_string_shift($key, $length), 256); |
| 1346 | $this->_string_shift($key); |
| 1347 | $length = $this->_decodeLength($key); |
| 1348 | $components['coefficients'][] = new Math_BigInteger($this->_string_shift($key, $length), 256); |
| 1349 | } |
| 1350 | } |
| 1351 | |
| 1352 | return $components; |
| 1353 | case CRYPT_RSA_PUBLIC_FORMAT_OPENSSH: |
| 1354 | $parts = explode(' ', $key, 3); |
| 1355 | |
| 1356 | $key = isset($parts[1]) ? base64_decode($parts[1]) : false; |
| 1357 | if ($key === false) { |
| 1358 | return false; |
| 1359 | } |
| 1360 | |
| 1361 | $comment = isset($parts[2]) ? $parts[2] : false; |
| 1362 | |
| 1363 | $cleanup = substr($key, 0, 11) == "\0\0\0\7ssh-rsa"; |
| 1364 | |
| 1365 | if (strlen($key) <= 4) { |
| 1366 | return false; |
| 1367 | } |
| 1368 | extract(unpack('Nlength', $this->_string_shift($key, 4))); |
| 1369 | $publicExponent = new Math_BigInteger($this->_string_shift($key, $length), -256); |
| 1370 | if (strlen($key) <= 4) { |
| 1371 | return false; |
| 1372 | } |
| 1373 | extract(unpack('Nlength', $this->_string_shift($key, 4))); |
| 1374 | $modulus = new Math_BigInteger($this->_string_shift($key, $length), -256); |
| 1375 | |
| 1376 | if ($cleanup && strlen($key)) { |
| 1377 | if (strlen($key) <= 4) { |
| 1378 | return false; |
| 1379 | } |
| 1380 | extract(unpack('Nlength', $this->_string_shift($key, 4))); |
| 1381 | $realModulus = new Math_BigInteger($this->_string_shift($key, $length), -256); |
| 1382 | return strlen($key) ? false : array( |
| 1383 | 'modulus' => $realModulus, |
| 1384 | 'publicExponent' => $modulus, |
| 1385 | 'comment' => $comment |
| 1386 | ); |
| 1387 | } else { |
| 1388 | return strlen($key) ? false : array( |
| 1389 | 'modulus' => $modulus, |
| 1390 | 'publicExponent' => $publicExponent, |
| 1391 | 'comment' => $comment |
| 1392 | ); |
| 1393 | } |
| 1394 | // http://www.w3.org/TR/xmldsig-core/#sec-RSAKeyValue |
| 1395 | // http://en.wikipedia.org/wiki/XML_Signature |
| 1396 | case CRYPT_RSA_PRIVATE_FORMAT_XML: |
| 1397 | case CRYPT_RSA_PUBLIC_FORMAT_XML: |
| 1398 | $this->components = array(); |
| 1399 | |
| 1400 | $xml = xml_parser_create('UTF-8'); |
| 1401 | xml_set_object($xml, $this); |
| 1402 | xml_set_element_handler($xml, '_start_element_handler', '_stop_element_handler'); |
| 1403 | xml_set_character_data_handler($xml, '_data_handler'); |
| 1404 | // add <xml></xml> to account for "dangling" tags like <BitStrength>...</BitStrength> that are sometimes added |
| 1405 | if (!xml_parse($xml, '<xml>' . $key . '</xml>')) { |
| 1406 | return false; |
| 1407 | } |
| 1408 | |
| 1409 | return isset($this->components['modulus']) && isset($this->components['publicExponent']) ? $this->components : false; |
| 1410 | // from PuTTY's SSHPUBK.C |
| 1411 | case CRYPT_RSA_PRIVATE_FORMAT_PUTTY: |
| 1412 | $components = array(); |
| 1413 | $key = preg_split('#\r\n|\r|\n#', $key); |
| 1414 | $type = trim(preg_replace('#PuTTY-User-Key-File-2: (.+)#', '$1', $key[0])); |
| 1415 | if ($type != 'ssh-rsa') { |
| 1416 | return false; |
| 1417 | } |
| 1418 | $encryption = trim(preg_replace('#Encryption: (.+)#', '$1', $key[1])); |
| 1419 | $comment = trim(preg_replace('#Comment: (.+)#', '$1', $key[2])); |
| 1420 | |
| 1421 | $publicLength = trim(preg_replace('#Public-Lines: (\d+)#', '$1', $key[3])); |
| 1422 | $public = base64_decode(implode('', array_map('trim', array_slice($key, 4, $publicLength)))); |
| 1423 | $public = substr($public, 11); |
| 1424 | extract(unpack('Nlength', $this->_string_shift($public, 4))); |
| 1425 | $components['publicExponent'] = new Math_BigInteger($this->_string_shift($public, $length), -256); |
| 1426 | extract(unpack('Nlength', $this->_string_shift($public, 4))); |
| 1427 | $components['modulus'] = new Math_BigInteger($this->_string_shift($public, $length), -256); |
| 1428 | |
| 1429 | $privateLength = trim(preg_replace('#Private-Lines: (\d+)#', '$1', $key[$publicLength + 4])); |
| 1430 | $private = base64_decode(implode('', array_map('trim', array_slice($key, $publicLength + 5, $privateLength)))); |
| 1431 | |
| 1432 | switch ($encryption) { |
| 1433 | case 'aes256-cbc': |
| 1434 | if (!class_exists('Crypt_AES')) { |
| 1435 | include_once 'Crypt/AES.php'; |
| 1436 | } |
| 1437 | $symkey = ''; |
| 1438 | $sequence = 0; |
| 1439 | while (strlen($symkey) < 32) { |
| 1440 | $temp = pack('Na*', $sequence++, $this->password); |
| 1441 | $symkey.= pack('H*', sha1($temp)); |
| 1442 | } |
| 1443 | $symkey = substr($symkey, 0, 32); |
| 1444 | $crypto = new Crypt_AES(); |
| 1445 | } |
| 1446 | |
| 1447 | if ($encryption != 'none') { |
| 1448 | $crypto->setKey($symkey); |
| 1449 | $crypto->disablePadding(); |
| 1450 | $private = $crypto->decrypt($private); |
| 1451 | if ($private === false) { |
| 1452 | return false; |
| 1453 | } |
| 1454 | } |
| 1455 | |
| 1456 | extract(unpack('Nlength', $this->_string_shift($private, 4))); |
| 1457 | if (strlen($private) < $length) { |
| 1458 | return false; |
| 1459 | } |
| 1460 | $components['privateExponent'] = new Math_BigInteger($this->_string_shift($private, $length), -256); |
| 1461 | extract(unpack('Nlength', $this->_string_shift($private, 4))); |
| 1462 | if (strlen($private) < $length) { |
| 1463 | return false; |
| 1464 | } |
| 1465 | $components['primes'] = array(1 => new Math_BigInteger($this->_string_shift($private, $length), -256)); |
| 1466 | extract(unpack('Nlength', $this->_string_shift($private, 4))); |
| 1467 | if (strlen($private) < $length) { |
| 1468 | return false; |
| 1469 | } |
| 1470 | $components['primes'][] = new Math_BigInteger($this->_string_shift($private, $length), -256); |
| 1471 | |
| 1472 | $temp = $components['primes'][1]->subtract($this->one); |
| 1473 | $components['exponents'] = array(1 => $components['publicExponent']->modInverse($temp)); |
| 1474 | $temp = $components['primes'][2]->subtract($this->one); |
| 1475 | $components['exponents'][] = $components['publicExponent']->modInverse($temp); |
| 1476 | |
| 1477 | extract(unpack('Nlength', $this->_string_shift($private, 4))); |
| 1478 | if (strlen($private) < $length) { |
| 1479 | return false; |
| 1480 | } |
| 1481 | $components['coefficients'] = array(2 => new Math_BigInteger($this->_string_shift($private, $length), -256)); |
| 1482 | |
| 1483 | return $components; |
| 1484 | } |
| 1485 | } |
| 1486 | |
| 1487 | /** |
| 1488 | * Returns the key size |
| 1489 | * |
| 1490 | * More specifically, this returns the size of the modulo in bits. |
| 1491 | * |
| 1492 | * @access public |
| 1493 | * @return Integer |
| 1494 | */ |
| 1495 | function getSize() |
| 1496 | { |
| 1497 | return !isset($this->modulus) ? 0 : strlen($this->modulus->toBits()); |
| 1498 | } |
| 1499 | |
| 1500 | /** |
| 1501 | * Start Element Handler |
| 1502 | * |
| 1503 | * Called by xml_set_element_handler() |
| 1504 | * |
| 1505 | * @access private |
| 1506 | * @param Resource $parser |
| 1507 | * @param String $name |
| 1508 | * @param Array $attribs |
| 1509 | */ |
| 1510 | function _start_element_handler($parser, $name, $attribs) |
| 1511 | { |
| 1512 | //$name = strtoupper($name); |
| 1513 | switch ($name) { |
| 1514 | case 'MODULUS': |
| 1515 | $this->current = &$this->components['modulus']; |
| 1516 | break; |
| 1517 | case 'EXPONENT': |
| 1518 | $this->current = &$this->components['publicExponent']; |
| 1519 | break; |
| 1520 | case 'P': |
| 1521 | $this->current = &$this->components['primes'][1]; |
| 1522 | break; |
| 1523 | case 'Q': |
| 1524 | $this->current = &$this->components['primes'][2]; |
| 1525 | break; |
| 1526 | case 'DP': |
| 1527 | $this->current = &$this->components['exponents'][1]; |
| 1528 | break; |
| 1529 | case 'DQ': |
| 1530 | $this->current = &$this->components['exponents'][2]; |
| 1531 | break; |
| 1532 | case 'INVERSEQ': |
| 1533 | $this->current = &$this->components['coefficients'][2]; |
| 1534 | break; |
| 1535 | case 'D': |
| 1536 | $this->current = &$this->components['privateExponent']; |
| 1537 | } |
| 1538 | $this->current = ''; |
| 1539 | } |
| 1540 | |
| 1541 | /** |
| 1542 | * Stop Element Handler |
| 1543 | * |
| 1544 | * Called by xml_set_element_handler() |
| 1545 | * |
| 1546 | * @access private |
| 1547 | * @param Resource $parser |
| 1548 | * @param String $name |
| 1549 | */ |
| 1550 | function _stop_element_handler($parser, $name) |
| 1551 | { |
| 1552 | if (isset($this->current)) { |
| 1553 | $this->current = new Math_BigInteger(base64_decode($this->current), 256); |
| 1554 | unset($this->current); |
| 1555 | } |
| 1556 | } |
| 1557 | |
| 1558 | /** |
| 1559 | * Data Handler |
| 1560 | * |
| 1561 | * Called by xml_set_character_data_handler() |
| 1562 | * |
| 1563 | * @access private |
| 1564 | * @param Resource $parser |
| 1565 | * @param String $data |
| 1566 | */ |
| 1567 | function _data_handler($parser, $data) |
| 1568 | { |
| 1569 | if (!isset($this->current) || is_object($this->current)) { |
| 1570 | return; |
| 1571 | } |
| 1572 | $this->current.= trim($data); |
| 1573 | } |
| 1574 | |
| 1575 | /** |
| 1576 | * Loads a public or private key |
| 1577 | * |
| 1578 | * Returns true on success and false on failure (ie. an incorrect password was provided or the key was malformed) |
| 1579 | * |
| 1580 | * @access public |
| 1581 | * @param String $key |
| 1582 | * @param Integer $type optional |
| 1583 | */ |
| 1584 | function loadKey($key, $type = false) |
| 1585 | { |
| 1586 | if (is_object($key) && strtolower(get_class($key)) == 'crypt_rsa') { |
| 1587 | $this->privateKeyFormat = $key->privateKeyFormat; |
| 1588 | $this->publicKeyFormat = $key->publicKeyFormat; |
| 1589 | $this->k = $key->k; |
| 1590 | $this->hLen = $key->hLen; |
| 1591 | $this->sLen = $key->sLen; |
| 1592 | $this->mgfHLen = $key->mgfHLen; |
| 1593 | $this->encryptionMode = $key->encryptionMode; |
| 1594 | $this->signatureMode = $key->signatureMode; |
| 1595 | $this->password = $key->password; |
| 1596 | $this->configFile = $key->configFile; |
| 1597 | $this->comment = $key->comment; |
| 1598 | |
| 1599 | if (is_object($key->hash)) { |
| 1600 | $this->hash = new Crypt_Hash($key->hash->getHash()); |
| 1601 | } |
| 1602 | if (is_object($key->mgfHash)) { |
| 1603 | $this->mgfHash = new Crypt_Hash($key->mgfHash->getHash()); |
| 1604 | } |
| 1605 | |
| 1606 | if (is_object($key->modulus)) { |
| 1607 | $this->modulus = $key->modulus->copy(); |
| 1608 | } |
| 1609 | if (is_object($key->exponent)) { |
| 1610 | $this->exponent = $key->exponent->copy(); |
| 1611 | } |
| 1612 | if (is_object($key->publicExponent)) { |
| 1613 | $this->publicExponent = $key->publicExponent->copy(); |
| 1614 | } |
| 1615 | |
| 1616 | $this->primes = array(); |
| 1617 | $this->exponents = array(); |
| 1618 | $this->coefficients = array(); |
| 1619 | |
| 1620 | foreach ($this->primes as $prime) { |
| 1621 | $this->primes[] = $prime->copy(); |
| 1622 | } |
| 1623 | foreach ($this->exponents as $exponent) { |
| 1624 | $this->exponents[] = $exponent->copy(); |
| 1625 | } |
| 1626 | foreach ($this->coefficients as $coefficient) { |
| 1627 | $this->coefficients[] = $coefficient->copy(); |
| 1628 | } |
| 1629 | |
| 1630 | return true; |
| 1631 | } |
| 1632 | |
| 1633 | if ($type === false) { |
| 1634 | $types = array( |
| 1635 | CRYPT_RSA_PUBLIC_FORMAT_RAW, |
| 1636 | CRYPT_RSA_PRIVATE_FORMAT_PKCS1, |
| 1637 | CRYPT_RSA_PRIVATE_FORMAT_XML, |
| 1638 | CRYPT_RSA_PRIVATE_FORMAT_PUTTY, |
| 1639 | CRYPT_RSA_PUBLIC_FORMAT_OPENSSH |
| 1640 | ); |
| 1641 | foreach ($types as $type) { |
| 1642 | $components = $this->_parseKey($key, $type); |
| 1643 | if ($components !== false) { |
| 1644 | break; |
| 1645 | } |
| 1646 | } |
| 1647 | |
| 1648 | } else { |
| 1649 | $components = $this->_parseKey($key, $type); |
| 1650 | } |
| 1651 | |
| 1652 | if ($components === false) { |
| 1653 | return false; |
| 1654 | } |
| 1655 | |
| 1656 | if (isset($components['comment']) && $components['comment'] !== false) { |
| 1657 | $this->comment = $components['comment']; |
| 1658 | } |
| 1659 | $this->modulus = $components['modulus']; |
| 1660 | $this->k = strlen($this->modulus->toBytes()); |
| 1661 | $this->exponent = isset($components['privateExponent']) ? $components['privateExponent'] : $components['publicExponent']; |
| 1662 | if (isset($components['primes'])) { |
| 1663 | $this->primes = $components['primes']; |
| 1664 | $this->exponents = $components['exponents']; |
| 1665 | $this->coefficients = $components['coefficients']; |
| 1666 | $this->publicExponent = $components['publicExponent']; |
| 1667 | } else { |
| 1668 | $this->primes = array(); |
| 1669 | $this->exponents = array(); |
| 1670 | $this->coefficients = array(); |
| 1671 | $this->publicExponent = false; |
| 1672 | } |
| 1673 | |
| 1674 | switch ($type) { |
| 1675 | case CRYPT_RSA_PUBLIC_FORMAT_OPENSSH: |
| 1676 | case CRYPT_RSA_PUBLIC_FORMAT_RAW: |
| 1677 | $this->setPublicKey(); |
| 1678 | break; |
| 1679 | case CRYPT_RSA_PRIVATE_FORMAT_PKCS1: |
| 1680 | switch (true) { |
| 1681 | case strpos($key, '-BEGIN PUBLIC KEY-') !== false: |
| 1682 | case strpos($key, '-BEGIN RSA PUBLIC KEY-') !== false: |
| 1683 | $this->setPublicKey(); |
| 1684 | } |
| 1685 | } |
| 1686 | |
| 1687 | return true; |
| 1688 | } |
| 1689 | |
| 1690 | /** |
| 1691 | * Sets the password |
| 1692 | * |
| 1693 | * Private keys can be encrypted with a password. To unset the password, pass in the empty string or false. |
| 1694 | * Or rather, pass in $password such that empty($password) && !is_string($password) is true. |
| 1695 | * |
| 1696 | * @see createKey() |
| 1697 | * @see loadKey() |
| 1698 | * @access public |
| 1699 | * @param String $password |
| 1700 | */ |
| 1701 | function setPassword($password = false) |
| 1702 | { |
| 1703 | $this->password = $password; |
| 1704 | } |
| 1705 | |
| 1706 | /** |
| 1707 | * Defines the public key |
| 1708 | * |
| 1709 | * Some private key formats define the public exponent and some don't. Those that don't define it are problematic when |
| 1710 | * used in certain contexts. For example, in SSH-2, RSA authentication works by sending the public key along with a |
| 1711 | * message signed by the private key to the server. The SSH-2 server looks the public key up in an index of public keys |
| 1712 | * and if it's present then proceeds to verify the signature. Problem is, if your private key doesn't include the public |
| 1713 | * exponent this won't work unless you manually add the public exponent. phpseclib tries to guess if the key being used |
| 1714 | * is the public key but in the event that it guesses incorrectly you might still want to explicitly set the key as being |
| 1715 | * public. |
| 1716 | * |
| 1717 | * Do note that when a new key is loaded the index will be cleared. |
| 1718 | * |
| 1719 | * Returns true on success, false on failure |
| 1720 | * |
| 1721 | * @see getPublicKey() |
| 1722 | * @access public |
| 1723 | * @param String $key optional |
| 1724 | * @param Integer $type optional |
| 1725 | * @return Boolean |
| 1726 | */ |
| 1727 | function setPublicKey($key = false, $type = false) |
| 1728 | { |
| 1729 | // if a public key has already been loaded return false |
| 1730 | if (!empty($this->publicExponent)) { |
| 1731 | return false; |
| 1732 | } |
| 1733 | |
| 1734 | if ($key === false && !empty($this->modulus)) { |
| 1735 | $this->publicExponent = $this->exponent; |
| 1736 | return true; |
| 1737 | } |
| 1738 | |
| 1739 | if ($type === false) { |
| 1740 | $types = array( |
| 1741 | CRYPT_RSA_PUBLIC_FORMAT_RAW, |
| 1742 | CRYPT_RSA_PUBLIC_FORMAT_PKCS1, |
| 1743 | CRYPT_RSA_PUBLIC_FORMAT_XML, |
| 1744 | CRYPT_RSA_PUBLIC_FORMAT_OPENSSH |
| 1745 | ); |
| 1746 | foreach ($types as $type) { |
| 1747 | $components = $this->_parseKey($key, $type); |
| 1748 | if ($components !== false) { |
| 1749 | break; |
| 1750 | } |
| 1751 | } |
| 1752 | } else { |
| 1753 | $components = $this->_parseKey($key, $type); |
| 1754 | } |
| 1755 | |
| 1756 | if ($components === false) { |
| 1757 | return false; |
| 1758 | } |
| 1759 | |
| 1760 | if (empty($this->modulus) || !$this->modulus->equals($components['modulus'])) { |
| 1761 | $this->modulus = $components['modulus']; |
| 1762 | $this->exponent = $this->publicExponent = $components['publicExponent']; |
| 1763 | return true; |
| 1764 | } |
| 1765 | |
| 1766 | $this->publicExponent = $components['publicExponent']; |
| 1767 | |
| 1768 | return true; |
| 1769 | } |
| 1770 | |
| 1771 | /** |
| 1772 | * Defines the private key |
| 1773 | * |
| 1774 | * If phpseclib guessed a private key was a public key and loaded it as such it might be desirable to force |
| 1775 | * phpseclib to treat the key as a private key. This function will do that. |
| 1776 | * |
| 1777 | * Do note that when a new key is loaded the index will be cleared. |
| 1778 | * |
| 1779 | * Returns true on success, false on failure |
| 1780 | * |
| 1781 | * @see getPublicKey() |
| 1782 | * @access public |
| 1783 | * @param String $key optional |
| 1784 | * @param Integer $type optional |
| 1785 | * @return Boolean |
| 1786 | */ |
| 1787 | function setPrivateKey($key = false, $type = false) |
| 1788 | { |
| 1789 | if ($key === false && !empty($this->publicExponent)) { |
| 1790 | unset($this->publicExponent); |
| 1791 | return true; |
| 1792 | } |
| 1793 | |
| 1794 | $rsa = new Crypt_RSA(); |
| 1795 | if (!$rsa->loadKey($key, $type)) { |
| 1796 | return false; |
| 1797 | } |
| 1798 | unset($rsa->publicExponent); |
| 1799 | |
| 1800 | // don't overwrite the old key if the new key is invalid |
| 1801 | $this->loadKey($rsa); |
| 1802 | return true; |
| 1803 | } |
| 1804 | |
| 1805 | /** |
| 1806 | * Returns the public key |
| 1807 | * |
| 1808 | * The public key is only returned under two circumstances - if the private key had the public key embedded within it |
| 1809 | * or if the public key was set via setPublicKey(). If the currently loaded key is supposed to be the public key this |
| 1810 | * function won't return it since this library, for the most part, doesn't distinguish between public and private keys. |
| 1811 | * |
| 1812 | * @see getPublicKey() |
| 1813 | * @access public |
| 1814 | * @param String $key |
| 1815 | * @param Integer $type optional |
| 1816 | */ |
| 1817 | function getPublicKey($type = CRYPT_RSA_PUBLIC_FORMAT_PKCS8) |
| 1818 | { |
| 1819 | if (empty($this->modulus) || empty($this->publicExponent)) { |
| 1820 | return false; |
| 1821 | } |
| 1822 | |
| 1823 | $oldFormat = $this->publicKeyFormat; |
| 1824 | $this->publicKeyFormat = $type; |
| 1825 | $temp = $this->_convertPublicKey($this->modulus, $this->publicExponent); |
| 1826 | $this->publicKeyFormat = $oldFormat; |
| 1827 | return $temp; |
| 1828 | } |
| 1829 | |
| 1830 | /** |
| 1831 | * Returns the public key's fingerprint |
| 1832 | * |
| 1833 | * The public key's fingerprint is returned, which is equivalent to running `ssh-keygen -lf rsa.pub`. If there is |
| 1834 | * no public key currently loaded, false is returned. |
| 1835 | * Example output (md5): "c1:b1:30:29:d7:b8:de:6c:97:77:10:d7:46:41:63:87" (as specified by RFC 4716) |
| 1836 | * |
| 1837 | * @access public |
| 1838 | * @param String $algorithm The hashing algorithm to be used. Valid options are 'md5' and 'sha256'. False is returned |
| 1839 | * for invalid values. |
| 1840 | */ |
| 1841 | public function getPublicKeyFingerprint($algorithm = 'md5') |
| 1842 | { |
| 1843 | if (empty($this->modulus) || empty($this->publicExponent)) { |
| 1844 | return false; |
| 1845 | } |
| 1846 | |
| 1847 | $modulus = $this->modulus->toBytes(true); |
| 1848 | $publicExponent = $this->publicExponent->toBytes(true); |
| 1849 | |
| 1850 | $RSAPublicKey = pack('Na*Na*Na*', strlen('ssh-rsa'), 'ssh-rsa', strlen($publicExponent), $publicExponent, strlen($modulus), $modulus); |
| 1851 | |
| 1852 | switch ($algorithm) { |
| 1853 | case 'sha256': |
| 1854 | $hash = new Crypt_Hash('sha256'); |
| 1855 | $base = base64_encode($hash->hash($RSAPublicKey)); |
| 1856 | return substr($base, 0, strlen($base) - 1); |
| 1857 | case 'md5': |
| 1858 | return substr(chunk_split(md5($RSAPublicKey), 2, ':'), 0, -1); |
| 1859 | default: |
| 1860 | return false; |
| 1861 | } |
| 1862 | |
| 1863 | } |
| 1864 | |
| 1865 | /** |
| 1866 | * Returns the private key |
| 1867 | * |
| 1868 | * The private key is only returned if the currently loaded key contains the constituent prime numbers. |
| 1869 | * |
| 1870 | * @see getPublicKey() |
| 1871 | * @access public |
| 1872 | * @param String $key |
| 1873 | * @param Integer $type optional |
| 1874 | */ |
| 1875 | function getPrivateKey($type = CRYPT_RSA_PUBLIC_FORMAT_PKCS1) |
| 1876 | { |
| 1877 | if (empty($this->primes)) { |
| 1878 | return false; |
| 1879 | } |
| 1880 | |
| 1881 | $oldFormat = $this->privateKeyFormat; |
| 1882 | $this->privateKeyFormat = $type; |
| 1883 | $temp = $this->_convertPrivateKey($this->modulus, $this->publicExponent, $this->exponent, $this->primes, $this->exponents, $this->coefficients); |
| 1884 | $this->privateKeyFormat = $oldFormat; |
| 1885 | return $temp; |
| 1886 | } |
| 1887 | |
| 1888 | /** |
| 1889 | * Returns a minimalistic private key |
| 1890 | * |
| 1891 | * Returns the private key without the prime number constituants. Structurally identical to a public key that |
| 1892 | * hasn't been set as the public key |
| 1893 | * |
| 1894 | * @see getPrivateKey() |
| 1895 | * @access private |
| 1896 | * @param String $key |
| 1897 | * @param Integer $type optional |
| 1898 | */ |
| 1899 | function _getPrivatePublicKey($mode = CRYPT_RSA_PUBLIC_FORMAT_PKCS8) |
| 1900 | { |
| 1901 | if (empty($this->modulus) || empty($this->exponent)) { |
| 1902 | return false; |
| 1903 | } |
| 1904 | |
| 1905 | $oldFormat = $this->publicKeyFormat; |
| 1906 | $this->publicKeyFormat = $mode; |
| 1907 | $temp = $this->_convertPublicKey($this->modulus, $this->exponent); |
| 1908 | $this->publicKeyFormat = $oldFormat; |
| 1909 | return $temp; |
| 1910 | } |
| 1911 | |
| 1912 | /** |
| 1913 | * __toString() magic method |
| 1914 | * |
| 1915 | * @access public |
| 1916 | */ |
| 1917 | function __toString() |
| 1918 | { |
| 1919 | $key = $this->getPrivateKey($this->privateKeyFormat); |
| 1920 | if ($key !== false) { |
| 1921 | return $key; |
| 1922 | } |
| 1923 | $key = $this->_getPrivatePublicKey($this->publicKeyFormat); |
| 1924 | return $key !== false ? $key : ''; |
| 1925 | } |
| 1926 | |
| 1927 | /** |
| 1928 | * __clone() magic method |
| 1929 | * |
| 1930 | * @access public |
| 1931 | */ |
| 1932 | function __clone() |
| 1933 | { |
| 1934 | $key = new Crypt_RSA(); |
| 1935 | $key->loadKey($this); |
| 1936 | return $key; |
| 1937 | } |
| 1938 | |
| 1939 | /** |
| 1940 | * Generates the smallest and largest numbers requiring $bits bits |
| 1941 | * |
| 1942 | * @access private |
| 1943 | * @param Integer $bits |
| 1944 | * @return Array |
| 1945 | */ |
| 1946 | function _generateMinMax($bits) |
| 1947 | { |
| 1948 | $bytes = $bits >> 3; |
| 1949 | $min = str_repeat(chr(0), $bytes); |
| 1950 | $max = str_repeat(chr(0xFF), $bytes); |
| 1951 | $msb = $bits & 7; |
| 1952 | if ($msb) { |
| 1953 | $min = chr(1 << ($msb - 1)) . $min; |
| 1954 | $max = chr((1 << $msb) - 1) . $max; |
| 1955 | } else { |
| 1956 | $min[0] = chr(0x80); |
| 1957 | } |
| 1958 | |
| 1959 | return array( |
| 1960 | 'min' => new Math_BigInteger($min, 256), |
| 1961 | 'max' => new Math_BigInteger($max, 256) |
| 1962 | ); |
| 1963 | } |
| 1964 | |
| 1965 | /** |
| 1966 | * DER-decode the length |
| 1967 | * |
| 1968 | * DER supports lengths up to (2**8)**127, however, we'll only support lengths up to (2**8)**4. See |
| 1969 | * {@link http://itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf#p=13 X.690 paragraph 8.1.3} for more information. |
| 1970 | * |
| 1971 | * @access private |
| 1972 | * @param String $string |
| 1973 | * @return Integer |
| 1974 | */ |
| 1975 | function _decodeLength(&$string) |
| 1976 | { |
| 1977 | $length = ord($this->_string_shift($string)); |
| 1978 | if ($length & 0x80) { // definite length, long form |
| 1979 | $length&= 0x7F; |
| 1980 | $temp = $this->_string_shift($string, $length); |
| 1981 | list(, $length) = unpack('N', substr(str_pad($temp, 4, chr(0), STR_PAD_LEFT), -4)); |
| 1982 | } |
| 1983 | return $length; |
| 1984 | } |
| 1985 | |
| 1986 | /** |
| 1987 | * DER-encode the length |
| 1988 | * |
| 1989 | * DER supports lengths up to (2**8)**127, however, we'll only support lengths up to (2**8)**4. See |
| 1990 | * {@link http://itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf#p=13 X.690 paragraph 8.1.3} for more information. |
| 1991 | * |
| 1992 | * @access private |
| 1993 | * @param Integer $length |
| 1994 | * @return String |
| 1995 | */ |
| 1996 | function _encodeLength($length) |
| 1997 | { |
| 1998 | if ($length <= 0x7F) { |
| 1999 | return chr($length); |
| 2000 | } |
| 2001 | |
| 2002 | $temp = ltrim(pack('N', $length), chr(0)); |
| 2003 | return pack('Ca*', 0x80 | strlen($temp), $temp); |
| 2004 | } |
| 2005 | |
| 2006 | /** |
| 2007 | * String Shift |
| 2008 | * |
| 2009 | * Inspired by array_shift |
| 2010 | * |
| 2011 | * @param String $string |
| 2012 | * @param optional Integer $index |
| 2013 | * @return String |
| 2014 | * @access private |
| 2015 | */ |
| 2016 | function _string_shift(&$string, $index = 1) |
| 2017 | { |
| 2018 | $substr = substr($string, 0, $index); |
| 2019 | $string = substr($string, $index); |
| 2020 | return $substr; |
| 2021 | } |
| 2022 | |
| 2023 | /** |
| 2024 | * Determines the private key format |
| 2025 | * |
| 2026 | * @see createKey() |
| 2027 | * @access public |
| 2028 | * @param Integer $format |
| 2029 | */ |
| 2030 | function setPrivateKeyFormat($format) |
| 2031 | { |
| 2032 | $this->privateKeyFormat = $format; |
| 2033 | } |
| 2034 | |
| 2035 | /** |
| 2036 | * Determines the public key format |
| 2037 | * |
| 2038 | * @see createKey() |
| 2039 | * @access public |
| 2040 | * @param Integer $format |
| 2041 | */ |
| 2042 | function setPublicKeyFormat($format) |
| 2043 | { |
| 2044 | $this->publicKeyFormat = $format; |
| 2045 | } |
| 2046 | |
| 2047 | /** |
| 2048 | * Determines which hashing function should be used |
| 2049 | * |
| 2050 | * Used with signature production / verification and (if the encryption mode is CRYPT_RSA_ENCRYPTION_OAEP) encryption and |
| 2051 | * decryption. If $hash isn't supported, sha1 is used. |
| 2052 | * |
| 2053 | * @access public |
| 2054 | * @param String $hash |
| 2055 | */ |
| 2056 | function setHash($hash) |
| 2057 | { |
| 2058 | // Crypt_Hash supports algorithms that PKCS#1 doesn't support. md5-96 and sha1-96, for example. |
| 2059 | switch ($hash) { |
| 2060 | case 'md2': |
| 2061 | case 'md5': |
| 2062 | case 'sha1': |
| 2063 | case 'sha256': |
| 2064 | case 'sha384': |
| 2065 | case 'sha512': |
| 2066 | $this->hash = new Crypt_Hash($hash); |
| 2067 | $this->hashName = $hash; |
| 2068 | break; |
| 2069 | default: |
| 2070 | $this->hash = new Crypt_Hash('sha1'); |
| 2071 | $this->hashName = 'sha1'; |
| 2072 | } |
| 2073 | $this->hLen = $this->hash->getLength(); |
| 2074 | } |
| 2075 | |
| 2076 | /** |
| 2077 | * Determines which hashing function should be used for the mask generation function |
| 2078 | * |
| 2079 | * The mask generation function is used by CRYPT_RSA_ENCRYPTION_OAEP and CRYPT_RSA_SIGNATURE_PSS and although it's |
| 2080 | * best if Hash and MGFHash are set to the same thing this is not a requirement. |
| 2081 | * |
| 2082 | * @access public |
| 2083 | * @param String $hash |
| 2084 | */ |
| 2085 | function setMGFHash($hash) |
| 2086 | { |
| 2087 | // Crypt_Hash supports algorithms that PKCS#1 doesn't support. md5-96 and sha1-96, for example. |
| 2088 | switch ($hash) { |
| 2089 | case 'md2': |
| 2090 | case 'md5': |
| 2091 | case 'sha1': |
| 2092 | case 'sha256': |
| 2093 | case 'sha384': |
| 2094 | case 'sha512': |
| 2095 | $this->mgfHash = new Crypt_Hash($hash); |
| 2096 | break; |
| 2097 | default: |
| 2098 | $this->mgfHash = new Crypt_Hash('sha1'); |
| 2099 | } |
| 2100 | $this->mgfHLen = $this->mgfHash->getLength(); |
| 2101 | } |
| 2102 | |
| 2103 | /** |
| 2104 | * Determines the salt length |
| 2105 | * |
| 2106 | * To quote from {@link http://tools.ietf.org/html/rfc3447#page-38 RFC3447#page-38}: |
| 2107 | * |
| 2108 | * Typical salt lengths in octets are hLen (the length of the output |
| 2109 | * of the hash function Hash) and 0. |
| 2110 | * |
| 2111 | * @access public |
| 2112 | * @param Integer $format |
| 2113 | */ |
| 2114 | function setSaltLength($sLen) |
| 2115 | { |
| 2116 | $this->sLen = $sLen; |
| 2117 | } |
| 2118 | |
| 2119 | /** |
| 2120 | * Integer-to-Octet-String primitive |
| 2121 | * |
| 2122 | * See {@link http://tools.ietf.org/html/rfc3447#section-4.1 RFC3447#section-4.1}. |
| 2123 | * |
| 2124 | * @access private |
| 2125 | * @param Math_BigInteger $x |
| 2126 | * @param Integer $xLen |
| 2127 | * @return String |
| 2128 | */ |
| 2129 | function _i2osp($x, $xLen) |
| 2130 | { |
| 2131 | $x = $x->toBytes(); |
| 2132 | if (strlen($x) > $xLen) { |
| 2133 | user_error('Integer too large'); |
| 2134 | return false; |
| 2135 | } |
| 2136 | return str_pad($x, $xLen, chr(0), STR_PAD_LEFT); |
| 2137 | } |
| 2138 | |
| 2139 | /** |
| 2140 | * Octet-String-to-Integer primitive |
| 2141 | * |
| 2142 | * See {@link http://tools.ietf.org/html/rfc3447#section-4.2 RFC3447#section-4.2}. |
| 2143 | * |
| 2144 | * @access private |
| 2145 | * @param String $x |
| 2146 | * @return Math_BigInteger |
| 2147 | */ |
| 2148 | function _os2ip($x) |
| 2149 | { |
| 2150 | return new Math_BigInteger($x, 256); |
| 2151 | } |
| 2152 | |
| 2153 | /** |
| 2154 | * Exponentiate with or without Chinese Remainder Theorem |
| 2155 | * |
| 2156 | * See {@link http://tools.ietf.org/html/rfc3447#section-5.1.1 RFC3447#section-5.1.2}. |
| 2157 | * |
| 2158 | * @access private |
| 2159 | * @param Math_BigInteger $x |
| 2160 | * @return Math_BigInteger |
| 2161 | */ |
| 2162 | function _exponentiate($x) |
| 2163 | { |
| 2164 | if (empty($this->primes) || empty($this->coefficients) || empty($this->exponents)) { |
| 2165 | return $x->modPow($this->exponent, $this->modulus); |
| 2166 | } |
| 2167 | |
| 2168 | $num_primes = count($this->primes); |
| 2169 | |
| 2170 | if (defined('CRYPT_RSA_DISABLE_BLINDING')) { |
| 2171 | $m_i = array( |
| 2172 | 1 => $x->modPow($this->exponents[1], $this->primes[1]), |
| 2173 | 2 => $x->modPow($this->exponents[2], $this->primes[2]) |
| 2174 | ); |
| 2175 | $h = $m_i[1]->subtract($m_i[2]); |
| 2176 | $h = $h->multiply($this->coefficients[2]); |
| 2177 | list(, $h) = $h->divide($this->primes[1]); |
| 2178 | $m = $m_i[2]->add($h->multiply($this->primes[2])); |
| 2179 | |
| 2180 | $r = $this->primes[1]; |
| 2181 | for ($i = 3; $i <= $num_primes; $i++) { |
| 2182 | $m_i = $x->modPow($this->exponents[$i], $this->primes[$i]); |
| 2183 | |
| 2184 | $r = $r->multiply($this->primes[$i - 1]); |
| 2185 | |
| 2186 | $h = $m_i->subtract($m); |
| 2187 | $h = $h->multiply($this->coefficients[$i]); |
| 2188 | list(, $h) = $h->divide($this->primes[$i]); |
| 2189 | |
| 2190 | $m = $m->add($r->multiply($h)); |
| 2191 | } |
| 2192 | } else { |
| 2193 | $smallest = $this->primes[1]; |
| 2194 | for ($i = 2; $i <= $num_primes; $i++) { |
| 2195 | if ($smallest->compare($this->primes[$i]) > 0) { |
| 2196 | $smallest = $this->primes[$i]; |
| 2197 | } |
| 2198 | } |
| 2199 | |
| 2200 | $one = new Math_BigInteger(1); |
| 2201 | |
| 2202 | $r = $one->random($one, $smallest->subtract($one)); |
| 2203 | |
| 2204 | $m_i = array( |
| 2205 | 1 => $this->_blind($x, $r, 1), |
| 2206 | 2 => $this->_blind($x, $r, 2) |
| 2207 | ); |
| 2208 | $h = $m_i[1]->subtract($m_i[2]); |
| 2209 | $h = $h->multiply($this->coefficients[2]); |
| 2210 | list(, $h) = $h->divide($this->primes[1]); |
| 2211 | $m = $m_i[2]->add($h->multiply($this->primes[2])); |
| 2212 | |
| 2213 | $r = $this->primes[1]; |
| 2214 | for ($i = 3; $i <= $num_primes; $i++) { |
| 2215 | $m_i = $this->_blind($x, $r, $i); |
| 2216 | |
| 2217 | $r = $r->multiply($this->primes[$i - 1]); |
| 2218 | |
| 2219 | $h = $m_i->subtract($m); |
| 2220 | $h = $h->multiply($this->coefficients[$i]); |
| 2221 | list(, $h) = $h->divide($this->primes[$i]); |
| 2222 | |
| 2223 | $m = $m->add($r->multiply($h)); |
| 2224 | } |
| 2225 | } |
| 2226 | |
| 2227 | return $m; |
| 2228 | } |
| 2229 | |
| 2230 | /** |
| 2231 | * Performs RSA Blinding |
| 2232 | * |
| 2233 | * Protects against timing attacks by employing RSA Blinding. |
| 2234 | * Returns $x->modPow($this->exponents[$i], $this->primes[$i]) |
| 2235 | * |
| 2236 | * @access private |
| 2237 | * @param Math_BigInteger $x |
| 2238 | * @param Math_BigInteger $r |
| 2239 | * @param Integer $i |
| 2240 | * @return Math_BigInteger |
| 2241 | */ |
| 2242 | function _blind($x, $r, $i) |
| 2243 | { |
| 2244 | $x = $x->multiply($r->modPow($this->publicExponent, $this->primes[$i])); |
| 2245 | $x = $x->modPow($this->exponents[$i], $this->primes[$i]); |
| 2246 | |
| 2247 | $r = $r->modInverse($this->primes[$i]); |
| 2248 | $x = $x->multiply($r); |
| 2249 | list(, $x) = $x->divide($this->primes[$i]); |
| 2250 | |
| 2251 | return $x; |
| 2252 | } |
| 2253 | |
| 2254 | /** |
| 2255 | * Performs blinded RSA equality testing |
| 2256 | * |
| 2257 | * Protects against a particular type of timing attack described. |
| 2258 | * |
| 2259 | * See {@link http://codahale.com/a-lesson-in-timing-attacks/ A Lesson In Timing Attacks (or, Don't use MessageDigest.isEquals)} |
| 2260 | * |
| 2261 | * Thanks for the heads up singpolyma! |
| 2262 | * |
| 2263 | * @access private |
| 2264 | * @param String $x |
| 2265 | * @param String $y |
| 2266 | * @return Boolean |
| 2267 | */ |
| 2268 | function _equals($x, $y) |
| 2269 | { |
| 2270 | if (strlen($x) != strlen($y)) { |
| 2271 | return false; |
| 2272 | } |
| 2273 | |
| 2274 | $result = 0; |
| 2275 | for ($i = 0; $i < strlen($x); $i++) { |
| 2276 | $result |= ord($x[$i]) ^ ord($y[$i]); |
| 2277 | } |
| 2278 | |
| 2279 | return $result == 0; |
| 2280 | } |
| 2281 | |
| 2282 | /** |
| 2283 | * RSAEP |
| 2284 | * |
| 2285 | * See {@link http://tools.ietf.org/html/rfc3447#section-5.1.1 RFC3447#section-5.1.1}. |
| 2286 | * |
| 2287 | * @access private |
| 2288 | * @param Math_BigInteger $m |
| 2289 | * @return Math_BigInteger |
| 2290 | */ |
| 2291 | function _rsaep($m) |
| 2292 | { |
| 2293 | if ($m->compare($this->zero) < 0 || $m->compare($this->modulus) > 0) { |
| 2294 | user_error('Message representative out of range'); |
| 2295 | return false; |
| 2296 | } |
| 2297 | return $this->_exponentiate($m); |
| 2298 | } |
| 2299 | |
| 2300 | /** |
| 2301 | * RSADP |
| 2302 | * |
| 2303 | * See {@link http://tools.ietf.org/html/rfc3447#section-5.1.2 RFC3447#section-5.1.2}. |
| 2304 | * |
| 2305 | * @access private |
| 2306 | * @param Math_BigInteger $c |
| 2307 | * @return Math_BigInteger |
| 2308 | */ |
| 2309 | function _rsadp($c) |
| 2310 | { |
| 2311 | if ($c->compare($this->zero) < 0 || $c->compare($this->modulus) > 0) { |
| 2312 | user_error('Ciphertext representative out of range'); |
| 2313 | return false; |
| 2314 | } |
| 2315 | return $this->_exponentiate($c); |
| 2316 | } |
| 2317 | |
| 2318 | /** |
| 2319 | * RSASP1 |
| 2320 | * |
| 2321 | * See {@link http://tools.ietf.org/html/rfc3447#section-5.2.1 RFC3447#section-5.2.1}. |
| 2322 | * |
| 2323 | * @access private |
| 2324 | * @param Math_BigInteger $m |
| 2325 | * @return Math_BigInteger |
| 2326 | */ |
| 2327 | function _rsasp1($m) |
| 2328 | { |
| 2329 | if ($m->compare($this->zero) < 0 || $m->compare($this->modulus) > 0) { |
| 2330 | user_error('Message representative out of range'); |
| 2331 | return false; |
| 2332 | } |
| 2333 | return $this->_exponentiate($m); |
| 2334 | } |
| 2335 | |
| 2336 | /** |
| 2337 | * RSAVP1 |
| 2338 | * |
| 2339 | * See {@link http://tools.ietf.org/html/rfc3447#section-5.2.2 RFC3447#section-5.2.2}. |
| 2340 | * |
| 2341 | * @access private |
| 2342 | * @param Math_BigInteger $s |
| 2343 | * @return Math_BigInteger |
| 2344 | */ |
| 2345 | function _rsavp1($s) |
| 2346 | { |
| 2347 | if ($s->compare($this->zero) < 0 || $s->compare($this->modulus) > 0) { |
| 2348 | user_error('Signature representative out of range'); |
| 2349 | return false; |
| 2350 | } |
| 2351 | return $this->_exponentiate($s); |
| 2352 | } |
| 2353 | |
| 2354 | /** |
| 2355 | * MGF1 |
| 2356 | * |
| 2357 | * See {@link http://tools.ietf.org/html/rfc3447#appendix-B.2.1 RFC3447#appendix-B.2.1}. |
| 2358 | * |
| 2359 | * @access private |
| 2360 | * @param String $mgfSeed |
| 2361 | * @param Integer $mgfLen |
| 2362 | * @return String |
| 2363 | */ |
| 2364 | function _mgf1($mgfSeed, $maskLen) |
| 2365 | { |
| 2366 | // if $maskLen would yield strings larger than 4GB, PKCS#1 suggests a "Mask too long" error be output. |
| 2367 | |
| 2368 | $t = ''; |
| 2369 | $count = ceil($maskLen / $this->mgfHLen); |
| 2370 | for ($i = 0; $i < $count; $i++) { |
| 2371 | $c = pack('N', $i); |
| 2372 | $t.= $this->mgfHash->hash($mgfSeed . $c); |
| 2373 | } |
| 2374 | |
| 2375 | return substr($t, 0, $maskLen); |
| 2376 | } |
| 2377 | |
| 2378 | /** |
| 2379 | * RSAES-OAEP-ENCRYPT |
| 2380 | * |
| 2381 | * See {@link http://tools.ietf.org/html/rfc3447#section-7.1.1 RFC3447#section-7.1.1} and |
| 2382 | * {http://en.wikipedia.org/wiki/Optimal_Asymmetric_Encryption_Padding OAES}. |
| 2383 | * |
| 2384 | * @access private |
| 2385 | * @param String $m |
| 2386 | * @param String $l |
| 2387 | * @return String |
| 2388 | */ |
| 2389 | function _rsaes_oaep_encrypt($m, $l = '') |
| 2390 | { |
| 2391 | $mLen = strlen($m); |
| 2392 | |
| 2393 | // Length checking |
| 2394 | |
| 2395 | // if $l is larger than two million terrabytes and you're using sha1, PKCS#1 suggests a "Label too long" error |
| 2396 | // be output. |
| 2397 | |
| 2398 | if ($mLen > $this->k - 2 * $this->hLen - 2) { |
| 2399 | user_error('Message too long'); |
| 2400 | return false; |
| 2401 | } |
| 2402 | |
| 2403 | // EME-OAEP encoding |
| 2404 | |
| 2405 | $lHash = $this->hash->hash($l); |
| 2406 | $ps = str_repeat(chr(0), $this->k - $mLen - 2 * $this->hLen - 2); |
| 2407 | $db = $lHash . $ps . chr(1) . $m; |
| 2408 | $seed = crypt_random_string($this->hLen); |
| 2409 | $dbMask = $this->_mgf1($seed, $this->k - $this->hLen - 1); |
| 2410 | $maskedDB = $db ^ $dbMask; |
| 2411 | $seedMask = $this->_mgf1($maskedDB, $this->hLen); |
| 2412 | $maskedSeed = $seed ^ $seedMask; |
| 2413 | $em = chr(0) . $maskedSeed . $maskedDB; |
| 2414 | |
| 2415 | // RSA encryption |
| 2416 | |
| 2417 | $m = $this->_os2ip($em); |
| 2418 | $c = $this->_rsaep($m); |
| 2419 | $c = $this->_i2osp($c, $this->k); |
| 2420 | |
| 2421 | // Output the ciphertext C |
| 2422 | |
| 2423 | return $c; |
| 2424 | } |
| 2425 | |
| 2426 | /** |
| 2427 | * RSAES-OAEP-DECRYPT |
| 2428 | * |
| 2429 | * See {@link http://tools.ietf.org/html/rfc3447#section-7.1.2 RFC3447#section-7.1.2}. The fact that the error |
| 2430 | * messages aren't distinguishable from one another hinders debugging, but, to quote from RFC3447#section-7.1.2: |
| 2431 | * |
| 2432 | * Note. Care must be taken to ensure that an opponent cannot |
| 2433 | * distinguish the different error conditions in Step 3.g, whether by |
| 2434 | * error message or timing, or, more generally, learn partial |
| 2435 | * information about the encoded message EM. Otherwise an opponent may |
| 2436 | * be able to obtain useful information about the decryption of the |
| 2437 | * ciphertext C, leading to a chosen-ciphertext attack such as the one |
| 2438 | * observed by Manger [36]. |
| 2439 | * |
| 2440 | * As for $l... to quote from {@link http://tools.ietf.org/html/rfc3447#page-17 RFC3447#page-17}: |
| 2441 | * |
| 2442 | * Both the encryption and the decryption operations of RSAES-OAEP take |
| 2443 | * the value of a label L as input. In this version of PKCS #1, L is |
| 2444 | * the empty string; other uses of the label are outside the scope of |
| 2445 | * this document. |
| 2446 | * |
| 2447 | * @access private |
| 2448 | * @param String $c |
| 2449 | * @param String $l |
| 2450 | * @return String |
| 2451 | */ |
| 2452 | function _rsaes_oaep_decrypt($c, $l = '') |
| 2453 | { |
| 2454 | // Length checking |
| 2455 | |
| 2456 | // if $l is larger than two million terrabytes and you're using sha1, PKCS#1 suggests a "Label too long" error |
| 2457 | // be output. |
| 2458 | |
| 2459 | if (strlen($c) != $this->k || $this->k < 2 * $this->hLen + 2) { |
| 2460 | user_error('Decryption error'); |
| 2461 | return false; |
| 2462 | } |
| 2463 | |
| 2464 | // RSA decryption |
| 2465 | |
| 2466 | $c = $this->_os2ip($c); |
| 2467 | $m = $this->_rsadp($c); |
| 2468 | if ($m === false) { |
| 2469 | user_error('Decryption error'); |
| 2470 | return false; |
| 2471 | } |
| 2472 | $em = $this->_i2osp($m, $this->k); |
| 2473 | |
| 2474 | // EME-OAEP decoding |
| 2475 | |
| 2476 | $lHash = $this->hash->hash($l); |
| 2477 | $y = ord($em[0]); |
| 2478 | $maskedSeed = substr($em, 1, $this->hLen); |
| 2479 | $maskedDB = substr($em, $this->hLen + 1); |
| 2480 | $seedMask = $this->_mgf1($maskedDB, $this->hLen); |
| 2481 | $seed = $maskedSeed ^ $seedMask; |
| 2482 | $dbMask = $this->_mgf1($seed, $this->k - $this->hLen - 1); |
| 2483 | $db = $maskedDB ^ $dbMask; |
| 2484 | $lHash2 = substr($db, 0, $this->hLen); |
| 2485 | $m = substr($db, $this->hLen); |
| 2486 | if ($lHash != $lHash2) { |
| 2487 | user_error('Decryption error'); |
| 2488 | return false; |
| 2489 | } |
| 2490 | $m = ltrim($m, chr(0)); |
| 2491 | if (ord($m[0]) != 1) { |
| 2492 | user_error('Decryption error'); |
| 2493 | return false; |
| 2494 | } |
| 2495 | |
| 2496 | // Output the message M |
| 2497 | |
| 2498 | return substr($m, 1); |
| 2499 | } |
| 2500 | |
| 2501 | /** |
| 2502 | * Raw Encryption / Decryption |
| 2503 | * |
| 2504 | * Doesn't use padding and is not recommended. |
| 2505 | * |
| 2506 | * @access private |
| 2507 | * @param String $m |
| 2508 | * @return String |
| 2509 | */ |
| 2510 | function _raw_encrypt($m) |
| 2511 | { |
| 2512 | $temp = $this->_os2ip($m); |
| 2513 | $temp = $this->_rsaep($temp); |
| 2514 | return $this->_i2osp($temp, $this->k); |
| 2515 | } |
| 2516 | |
| 2517 | /** |
| 2518 | * RSAES-PKCS1-V1_5-ENCRYPT |
| 2519 | * |
| 2520 | * See {@link http://tools.ietf.org/html/rfc3447#section-7.2.1 RFC3447#section-7.2.1}. |
| 2521 | * |
| 2522 | * @access private |
| 2523 | * @param String $m |
| 2524 | * @return String |
| 2525 | */ |
| 2526 | function _rsaes_pkcs1_v1_5_encrypt($m) |
| 2527 | { |
| 2528 | $mLen = strlen($m); |
| 2529 | |
| 2530 | // Length checking |
| 2531 | |
| 2532 | if ($mLen > $this->k - 11) { |
| 2533 | user_error('Message too long'); |
| 2534 | return false; |
| 2535 | } |
| 2536 | |
| 2537 | // EME-PKCS1-v1_5 encoding |
| 2538 | |
| 2539 | $psLen = $this->k - $mLen - 3; |
| 2540 | $ps = ''; |
| 2541 | while (strlen($ps) != $psLen) { |
| 2542 | $temp = crypt_random_string($psLen - strlen($ps)); |
| 2543 | $temp = str_replace("\x00", '', $temp); |
| 2544 | $ps.= $temp; |
| 2545 | } |
| 2546 | $type = 2; |
| 2547 | // see the comments of _rsaes_pkcs1_v1_5_decrypt() to understand why this is being done |
| 2548 | if (defined('CRYPT_RSA_PKCS15_COMPAT') && (!isset($this->publicExponent) || $this->exponent !== $this->publicExponent)) { |
| 2549 | $type = 1; |
| 2550 | // "The padding string PS shall consist of k-3-||D|| octets. ... for block type 01, they shall have value FF" |
| 2551 | $ps = str_repeat("\xFF", $psLen); |
| 2552 | } |
| 2553 | $em = chr(0) . chr($type) . $ps . chr(0) . $m; |
| 2554 | |
| 2555 | // RSA encryption |
| 2556 | $m = $this->_os2ip($em); |
| 2557 | $c = $this->_rsaep($m); |
| 2558 | $c = $this->_i2osp($c, $this->k); |
| 2559 | |
| 2560 | // Output the ciphertext C |
| 2561 | |
| 2562 | return $c; |
| 2563 | } |
| 2564 | |
| 2565 | /** |
| 2566 | * RSAES-PKCS1-V1_5-DECRYPT |
| 2567 | * |
| 2568 | * See {@link http://tools.ietf.org/html/rfc3447#section-7.2.2 RFC3447#section-7.2.2}. |
| 2569 | * |
| 2570 | * For compatibility purposes, this function departs slightly from the description given in RFC3447. |
| 2571 | * The reason being that RFC2313#section-8.1 (PKCS#1 v1.5) states that ciphertext's encrypted by the |
| 2572 | * private key should have the second byte set to either 0 or 1 and that ciphertext's encrypted by the |
| 2573 | * public key should have the second byte set to 2. In RFC3447 (PKCS#1 v2.1), the second byte is supposed |
| 2574 | * to be 2 regardless of which key is used. For compatibility purposes, we'll just check to make sure the |
| 2575 | * second byte is 2 or less. If it is, we'll accept the decrypted string as valid. |
| 2576 | * |
| 2577 | * As a consequence of this, a private key encrypted ciphertext produced with Crypt_RSA may not decrypt |
| 2578 | * with a strictly PKCS#1 v1.5 compliant RSA implementation. Public key encrypted ciphertext's should but |
| 2579 | * not private key encrypted ciphertext's. |
| 2580 | * |
| 2581 | * @access private |
| 2582 | * @param String $c |
| 2583 | * @return String |
| 2584 | */ |
| 2585 | function _rsaes_pkcs1_v1_5_decrypt($c) |
| 2586 | { |
| 2587 | // Length checking |
| 2588 | |
| 2589 | if (strlen($c) != $this->k) { // or if k < 11 |
| 2590 | user_error('Decryption error'); |
| 2591 | return false; |
| 2592 | } |
| 2593 | |
| 2594 | // RSA decryption |
| 2595 | |
| 2596 | $c = $this->_os2ip($c); |
| 2597 | $m = $this->_rsadp($c); |
| 2598 | |
| 2599 | if ($m === false) { |
| 2600 | user_error('Decryption error'); |
| 2601 | return false; |
| 2602 | } |
| 2603 | $em = $this->_i2osp($m, $this->k); |
| 2604 | |
| 2605 | // EME-PKCS1-v1_5 decoding |
| 2606 | |
| 2607 | if (ord($em[0]) != 0 || ord($em[1]) > 2) { |
| 2608 | user_error('Decryption error'); |
| 2609 | return false; |
| 2610 | } |
| 2611 | |
| 2612 | $ps = substr($em, 2, strpos($em, chr(0), 2) - 2); |
| 2613 | $m = substr($em, strlen($ps) + 3); |
| 2614 | |
| 2615 | if (strlen($ps) < 8) { |
| 2616 | user_error('Decryption error'); |
| 2617 | return false; |
| 2618 | } |
| 2619 | |
| 2620 | // Output M |
| 2621 | |
| 2622 | return $m; |
| 2623 | } |
| 2624 | |
| 2625 | /** |
| 2626 | * EMSA-PSS-ENCODE |
| 2627 | * |
| 2628 | * See {@link http://tools.ietf.org/html/rfc3447#section-9.1.1 RFC3447#section-9.1.1}. |
| 2629 | * |
| 2630 | * @access private |
| 2631 | * @param String $m |
| 2632 | * @param Integer $emBits |
| 2633 | */ |
| 2634 | function _emsa_pss_encode($m, $emBits) |
| 2635 | { |
| 2636 | // if $m is larger than two million terrabytes and you're using sha1, PKCS#1 suggests a "Label too long" error |
| 2637 | // be output. |
| 2638 | |
| 2639 | $emLen = ($emBits + 1) >> 3; // ie. ceil($emBits / 8) |
| 2640 | $sLen = $this->sLen === false ? $this->hLen : $this->sLen; |
| 2641 | |
| 2642 | $mHash = $this->hash->hash($m); |
| 2643 | if ($emLen < $this->hLen + $sLen + 2) { |
| 2644 | user_error('Encoding error'); |
| 2645 | return false; |
| 2646 | } |
| 2647 | |
| 2648 | $salt = crypt_random_string($sLen); |
| 2649 | $m2 = "\0\0\0\0\0\0\0\0" . $mHash . $salt; |
| 2650 | $h = $this->hash->hash($m2); |
| 2651 | $ps = str_repeat(chr(0), $emLen - $sLen - $this->hLen - 2); |
| 2652 | $db = $ps . chr(1) . $salt; |
| 2653 | $dbMask = $this->_mgf1($h, $emLen - $this->hLen - 1); |
| 2654 | $maskedDB = $db ^ $dbMask; |
| 2655 | $maskedDB[0] = ~chr(0xFF << ($emBits & 7)) & $maskedDB[0]; |
| 2656 | $em = $maskedDB . $h . chr(0xBC); |
| 2657 | |
| 2658 | return $em; |
| 2659 | } |
| 2660 | |
| 2661 | /** |
| 2662 | * EMSA-PSS-VERIFY |
| 2663 | * |
| 2664 | * See {@link http://tools.ietf.org/html/rfc3447#section-9.1.2 RFC3447#section-9.1.2}. |
| 2665 | * |
| 2666 | * @access private |
| 2667 | * @param String $m |
| 2668 | * @param String $em |
| 2669 | * @param Integer $emBits |
| 2670 | * @return String |
| 2671 | */ |
| 2672 | function _emsa_pss_verify($m, $em, $emBits) |
| 2673 | { |
| 2674 | // if $m is larger than two million terrabytes and you're using sha1, PKCS#1 suggests a "Label too long" error |
| 2675 | // be output. |
| 2676 | |
| 2677 | $emLen = ($emBits + 1) >> 3; // ie. ceil($emBits / 8); |
| 2678 | $sLen = $this->sLen === false ? $this->hLen : $this->sLen; |
| 2679 | |
| 2680 | $mHash = $this->hash->hash($m); |
| 2681 | if ($emLen < $this->hLen + $sLen + 2) { |
| 2682 | return false; |
| 2683 | } |
| 2684 | |
| 2685 | if ($em[strlen($em) - 1] != chr(0xBC)) { |
| 2686 | return false; |
| 2687 | } |
| 2688 | |
| 2689 | $maskedDB = substr($em, 0, -$this->hLen - 1); |
| 2690 | $h = substr($em, -$this->hLen - 1, $this->hLen); |
| 2691 | $temp = chr(0xFF << ($emBits & 7)); |
| 2692 | if ((~$maskedDB[0] & $temp) != $temp) { |
| 2693 | return false; |
| 2694 | } |
| 2695 | $dbMask = $this->_mgf1($h, $emLen - $this->hLen - 1); |
| 2696 | $db = $maskedDB ^ $dbMask; |
| 2697 | $db[0] = ~chr(0xFF << ($emBits & 7)) & $db[0]; |
| 2698 | $temp = $emLen - $this->hLen - $sLen - 2; |
| 2699 | if (substr($db, 0, $temp) != str_repeat(chr(0), $temp) || ord($db[$temp]) != 1) { |
| 2700 | return false; |
| 2701 | } |
| 2702 | $salt = substr($db, $temp + 1); // should be $sLen long |
| 2703 | $m2 = "\0\0\0\0\0\0\0\0" . $mHash . $salt; |
| 2704 | $h2 = $this->hash->hash($m2); |
| 2705 | return $this->_equals($h, $h2); |
| 2706 | } |
| 2707 | |
| 2708 | /** |
| 2709 | * RSASSA-PSS-SIGN |
| 2710 | * |
| 2711 | * See {@link http://tools.ietf.org/html/rfc3447#section-8.1.1 RFC3447#section-8.1.1}. |
| 2712 | * |
| 2713 | * @access private |
| 2714 | * @param String $m |
| 2715 | * @return String |
| 2716 | */ |
| 2717 | function _rsassa_pss_sign($m) |
| 2718 | { |
| 2719 | // EMSA-PSS encoding |
| 2720 | |
| 2721 | $em = $this->_emsa_pss_encode($m, 8 * $this->k - 1); |
| 2722 | |
| 2723 | // RSA signature |
| 2724 | |
| 2725 | $m = $this->_os2ip($em); |
| 2726 | $s = $this->_rsasp1($m); |
| 2727 | $s = $this->_i2osp($s, $this->k); |
| 2728 | |
| 2729 | // Output the signature S |
| 2730 | |
| 2731 | return $s; |
| 2732 | } |
| 2733 | |
| 2734 | /** |
| 2735 | * RSASSA-PSS-VERIFY |
| 2736 | * |
| 2737 | * See {@link http://tools.ietf.org/html/rfc3447#section-8.1.2 RFC3447#section-8.1.2}. |
| 2738 | * |
| 2739 | * @access private |
| 2740 | * @param String $m |
| 2741 | * @param String $s |
| 2742 | * @return String |
| 2743 | */ |
| 2744 | function _rsassa_pss_verify($m, $s) |
| 2745 | { |
| 2746 | // Length checking |
| 2747 | |
| 2748 | if (strlen($s) != $this->k) { |
| 2749 | user_error('Invalid signature'); |
| 2750 | return false; |
| 2751 | } |
| 2752 | |
| 2753 | // RSA verification |
| 2754 | |
| 2755 | $modBits = 8 * $this->k; |
| 2756 | |
| 2757 | $s2 = $this->_os2ip($s); |
| 2758 | $m2 = $this->_rsavp1($s2); |
| 2759 | if ($m2 === false) { |
| 2760 | user_error('Invalid signature'); |
| 2761 | return false; |
| 2762 | } |
| 2763 | $em = $this->_i2osp($m2, $modBits >> 3); |
| 2764 | if ($em === false) { |
| 2765 | user_error('Invalid signature'); |
| 2766 | return false; |
| 2767 | } |
| 2768 | |
| 2769 | // EMSA-PSS verification |
| 2770 | |
| 2771 | return $this->_emsa_pss_verify($m, $em, $modBits - 1); |
| 2772 | } |
| 2773 | |
| 2774 | /** |
| 2775 | * EMSA-PKCS1-V1_5-ENCODE |
| 2776 | * |
| 2777 | * See {@link http://tools.ietf.org/html/rfc3447#section-9.2 RFC3447#section-9.2}. |
| 2778 | * |
| 2779 | * @access private |
| 2780 | * @param String $m |
| 2781 | * @param Integer $emLen |
| 2782 | * @return String |
| 2783 | */ |
| 2784 | function _emsa_pkcs1_v1_5_encode($m, $emLen) |
| 2785 | { |
| 2786 | $h = $this->hash->hash($m); |
| 2787 | if ($h === false) { |
| 2788 | return false; |
| 2789 | } |
| 2790 | |
| 2791 | // see http://tools.ietf.org/html/rfc3447#page-43 |
| 2792 | switch ($this->hashName) { |
| 2793 | case 'md2': |
| 2794 | $t = pack('H*', '3020300c06082a864886f70d020205000410'); |
| 2795 | break; |
| 2796 | case 'md5': |
| 2797 | $t = pack('H*', '3020300c06082a864886f70d020505000410'); |
| 2798 | break; |
| 2799 | case 'sha1': |
| 2800 | $t = pack('H*', '3021300906052b0e03021a05000414'); |
| 2801 | break; |
| 2802 | case 'sha256': |
| 2803 | $t = pack('H*', '3031300d060960864801650304020105000420'); |
| 2804 | break; |
| 2805 | case 'sha384': |
| 2806 | $t = pack('H*', '3041300d060960864801650304020205000430'); |
| 2807 | break; |
| 2808 | case 'sha512': |
| 2809 | $t = pack('H*', '3051300d060960864801650304020305000440'); |
| 2810 | } |
| 2811 | $t.= $h; |
| 2812 | $tLen = strlen($t); |
| 2813 | |
| 2814 | if ($emLen < $tLen + 11) { |
| 2815 | user_error('Intended encoded message length too short'); |
| 2816 | return false; |
| 2817 | } |
| 2818 | |
| 2819 | $ps = str_repeat(chr(0xFF), $emLen - $tLen - 3); |
| 2820 | |
| 2821 | $em = "\0\1$ps\0$t"; |
| 2822 | |
| 2823 | return $em; |
| 2824 | } |
| 2825 | |
| 2826 | /** |
| 2827 | * RSASSA-PKCS1-V1_5-SIGN |
| 2828 | * |
| 2829 | * See {@link http://tools.ietf.org/html/rfc3447#section-8.2.1 RFC3447#section-8.2.1}. |
| 2830 | * |
| 2831 | * @access private |
| 2832 | * @param String $m |
| 2833 | * @return String |
| 2834 | */ |
| 2835 | function _rsassa_pkcs1_v1_5_sign($m) |
| 2836 | { |
| 2837 | // EMSA-PKCS1-v1_5 encoding |
| 2838 | |
| 2839 | $em = $this->_emsa_pkcs1_v1_5_encode($m, $this->k); |
| 2840 | if ($em === false) { |
| 2841 | user_error('RSA modulus too short'); |
| 2842 | return false; |
| 2843 | } |
| 2844 | |
| 2845 | // RSA signature |
| 2846 | |
| 2847 | $m = $this->_os2ip($em); |
| 2848 | $s = $this->_rsasp1($m); |
| 2849 | $s = $this->_i2osp($s, $this->k); |
| 2850 | |
| 2851 | // Output the signature S |
| 2852 | |
| 2853 | return $s; |
| 2854 | } |
| 2855 | |
| 2856 | /** |
| 2857 | * RSASSA-PKCS1-V1_5-VERIFY |
| 2858 | * |
| 2859 | * See {@link http://tools.ietf.org/html/rfc3447#section-8.2.2 RFC3447#section-8.2.2}. |
| 2860 | * |
| 2861 | * @access private |
| 2862 | * @param String $m |
| 2863 | * @return String |
| 2864 | */ |
| 2865 | function _rsassa_pkcs1_v1_5_verify($m, $s) |
| 2866 | { |
| 2867 | // Length checking |
| 2868 | |
| 2869 | if (strlen($s) != $this->k) { |
| 2870 | user_error('Invalid signature'); |
| 2871 | return false; |
| 2872 | } |
| 2873 | |
| 2874 | // RSA verification |
| 2875 | |
| 2876 | $s = $this->_os2ip($s); |
| 2877 | $m2 = $this->_rsavp1($s); |
| 2878 | if ($m2 === false) { |
| 2879 | user_error('Invalid signature'); |
| 2880 | return false; |
| 2881 | } |
| 2882 | $em = $this->_i2osp($m2, $this->k); |
| 2883 | if ($em === false) { |
| 2884 | user_error('Invalid signature'); |
| 2885 | return false; |
| 2886 | } |
| 2887 | |
| 2888 | // EMSA-PKCS1-v1_5 encoding |
| 2889 | |
| 2890 | $em2 = $this->_emsa_pkcs1_v1_5_encode($m, $this->k); |
| 2891 | if ($em2 === false) { |
| 2892 | user_error('RSA modulus too short'); |
| 2893 | return false; |
| 2894 | } |
| 2895 | |
| 2896 | // Compare |
| 2897 | return $this->_equals($em, $em2); |
| 2898 | } |
| 2899 | |
| 2900 | /** |
| 2901 | * Set Encryption Mode |
| 2902 | * |
| 2903 | * Valid values include CRYPT_RSA_ENCRYPTION_OAEP and CRYPT_RSA_ENCRYPTION_PKCS1. |
| 2904 | * |
| 2905 | * @access public |
| 2906 | * @param Integer $mode |
| 2907 | */ |
| 2908 | function setEncryptionMode($mode) |
| 2909 | { |
| 2910 | $this->encryptionMode = $mode; |
| 2911 | } |
| 2912 | |
| 2913 | /** |
| 2914 | * Set Signature Mode |
| 2915 | * |
| 2916 | * Valid values include CRYPT_RSA_SIGNATURE_PSS and CRYPT_RSA_SIGNATURE_PKCS1 |
| 2917 | * |
| 2918 | * @access public |
| 2919 | * @param Integer $mode |
| 2920 | */ |
| 2921 | function setSignatureMode($mode) |
| 2922 | { |
| 2923 | $this->signatureMode = $mode; |
| 2924 | } |
| 2925 | |
| 2926 | /** |
| 2927 | * Set public key comment. |
| 2928 | * |
| 2929 | * @access public |
| 2930 | * @param String $comment |
| 2931 | */ |
| 2932 | function setComment($comment) |
| 2933 | { |
| 2934 | $this->comment = $comment; |
| 2935 | } |
| 2936 | |
| 2937 | /** |
| 2938 | * Get public key comment. |
| 2939 | * |
| 2940 | * @access public |
| 2941 | * @return String |
| 2942 | */ |
| 2943 | function getComment() |
| 2944 | { |
| 2945 | return $this->comment; |
| 2946 | } |
| 2947 | |
| 2948 | /** |
| 2949 | * Encryption |
| 2950 | * |
| 2951 | * Both CRYPT_RSA_ENCRYPTION_OAEP and CRYPT_RSA_ENCRYPTION_PKCS1 both place limits on how long $plaintext can be. |
| 2952 | * If $plaintext exceeds those limits it will be broken up so that it does and the resultant ciphertext's will |
| 2953 | * be concatenated together. |
| 2954 | * |
| 2955 | * @see decrypt() |
| 2956 | * @access public |
| 2957 | * @param String $plaintext |
| 2958 | * @return String |
| 2959 | */ |
| 2960 | function encrypt($plaintext) |
| 2961 | { |
| 2962 | switch ($this->encryptionMode) { |
| 2963 | case CRYPT_RSA_ENCRYPTION_NONE: |
| 2964 | $plaintext = str_split($plaintext, $this->k); |
| 2965 | $ciphertext = ''; |
| 2966 | foreach ($plaintext as $m) { |
| 2967 | $ciphertext.= $this->_raw_encrypt($m); |
| 2968 | } |
| 2969 | return $ciphertext; |
| 2970 | case CRYPT_RSA_ENCRYPTION_PKCS1: |
| 2971 | $length = $this->k - 11; |
| 2972 | if ($length <= 0) { |
| 2973 | return false; |
| 2974 | } |
| 2975 | |
| 2976 | $plaintext = str_split($plaintext, $length); |
| 2977 | $ciphertext = ''; |
| 2978 | foreach ($plaintext as $m) { |
| 2979 | $ciphertext.= $this->_rsaes_pkcs1_v1_5_encrypt($m); |
| 2980 | } |
| 2981 | return $ciphertext; |
| 2982 | //case CRYPT_RSA_ENCRYPTION_OAEP: |
| 2983 | default: |
| 2984 | $length = $this->k - 2 * $this->hLen - 2; |
| 2985 | if ($length <= 0) { |
| 2986 | return false; |
| 2987 | } |
| 2988 | |
| 2989 | $plaintext = str_split($plaintext, $length); |
| 2990 | $ciphertext = ''; |
| 2991 | foreach ($plaintext as $m) { |
| 2992 | $ciphertext.= $this->_rsaes_oaep_encrypt($m); |
| 2993 | } |
| 2994 | return $ciphertext; |
| 2995 | } |
| 2996 | } |
| 2997 | |
| 2998 | /** |
| 2999 | * Decryption |
| 3000 | * |
| 3001 | * @see encrypt() |
| 3002 | * @access public |
| 3003 | * @param String $plaintext |
| 3004 | * @return String |
| 3005 | */ |
| 3006 | function decrypt($ciphertext) |
| 3007 | { |
| 3008 | if ($this->k <= 0) { |
| 3009 | return false; |
| 3010 | } |
| 3011 | |
| 3012 | $ciphertext = str_split($ciphertext, $this->k); |
| 3013 | $ciphertext[count($ciphertext) - 1] = str_pad($ciphertext[count($ciphertext) - 1], $this->k, chr(0), STR_PAD_LEFT); |
| 3014 | |
| 3015 | $plaintext = ''; |
| 3016 | |
| 3017 | switch ($this->encryptionMode) { |
| 3018 | case CRYPT_RSA_ENCRYPTION_NONE: |
| 3019 | $decrypt = '_raw_encrypt'; |
| 3020 | break; |
| 3021 | case CRYPT_RSA_ENCRYPTION_PKCS1: |
| 3022 | $decrypt = '_rsaes_pkcs1_v1_5_decrypt'; |
| 3023 | break; |
| 3024 | //case CRYPT_RSA_ENCRYPTION_OAEP: |
| 3025 | default: |
| 3026 | $decrypt = '_rsaes_oaep_decrypt'; |
| 3027 | } |
| 3028 | |
| 3029 | foreach ($ciphertext as $c) { |
| 3030 | $temp = $this->$decrypt($c); |
| 3031 | if ($temp === false) { |
| 3032 | return false; |
| 3033 | } |
| 3034 | $plaintext.= $temp; |
| 3035 | } |
| 3036 | |
| 3037 | return $plaintext; |
| 3038 | } |
| 3039 | |
| 3040 | /** |
| 3041 | * Create a signature |
| 3042 | * |
| 3043 | * @see verify() |
| 3044 | * @access public |
| 3045 | * @param String $message |
| 3046 | * @return String |
| 3047 | */ |
| 3048 | function sign($message) |
| 3049 | { |
| 3050 | if (empty($this->modulus) || empty($this->exponent)) { |
| 3051 | return false; |
| 3052 | } |
| 3053 | |
| 3054 | switch ($this->signatureMode) { |
| 3055 | case CRYPT_RSA_SIGNATURE_PKCS1: |
| 3056 | return $this->_rsassa_pkcs1_v1_5_sign($message); |
| 3057 | //case CRYPT_RSA_SIGNATURE_PSS: |
| 3058 | default: |
| 3059 | return $this->_rsassa_pss_sign($message); |
| 3060 | } |
| 3061 | } |
| 3062 | |
| 3063 | /** |
| 3064 | * Verifies a signature |
| 3065 | * |
| 3066 | * @see sign() |
| 3067 | * @access public |
| 3068 | * @param String $message |
| 3069 | * @param String $signature |
| 3070 | * @return Boolean |
| 3071 | */ |
| 3072 | function verify($message, $signature) |
| 3073 | { |
| 3074 | if (empty($this->modulus) || empty($this->exponent)) { |
| 3075 | return false; |
| 3076 | } |
| 3077 | |
| 3078 | switch ($this->signatureMode) { |
| 3079 | case CRYPT_RSA_SIGNATURE_PKCS1: |
| 3080 | return $this->_rsassa_pkcs1_v1_5_verify($message, $signature); |
| 3081 | //case CRYPT_RSA_SIGNATURE_PSS: |
| 3082 | default: |
| 3083 | return $this->_rsassa_pss_verify($message, $signature); |
| 3084 | } |
| 3085 | } |
| 3086 | |
| 3087 | /** |
| 3088 | * Extract raw BER from Base64 encoding |
| 3089 | * |
| 3090 | * @access private |
| 3091 | * @param String $str |
| 3092 | * @return String |
| 3093 | */ |
| 3094 | function _extractBER($str) |
| 3095 | { |
| 3096 | /* X.509 certs are assumed to be base64 encoded but sometimes they'll have additional things in them |
| 3097 | * above and beyond the ceritificate. |
| 3098 | * ie. some may have the following preceding the -----BEGIN CERTIFICATE----- line: |
| 3099 | * |
| 3100 | * Bag Attributes |
| 3101 | * localKeyID: 01 00 00 00 |
| 3102 | * subject=/O=organization/OU=org unit/CN=common name |
| 3103 | * issuer=/O=organization/CN=common name |
| 3104 | */ |
| 3105 | $temp = preg_replace('#.*?^-+[^-]+-+#ms', '', $str, 1); |
| 3106 | // remove the -----BEGIN CERTIFICATE----- and -----END CERTIFICATE----- stuff |
| 3107 | $temp = preg_replace('#-+[^-]+-+#', '', $temp); |
| 3108 | // remove new lines |
| 3109 | $temp = str_replace(array("\r", "\n", ' '), '', $temp); |
| 3110 | $temp = preg_match('#^[a-zA-Z\d/+]*={0,2}$#', $temp) ? base64_decode($temp) : false; |
| 3111 | return $temp != false ? $temp : $str; |
| 3112 | } |
| 3113 | } |