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Diffstat (limited to 'vendor/phpseclib/phpseclib/phpseclib/Crypt/RC2.php')
| -rw-r--r-- | vendor/phpseclib/phpseclib/phpseclib/Crypt/RC2.php | 640 |
1 files changed, 640 insertions, 0 deletions
diff --git a/vendor/phpseclib/phpseclib/phpseclib/Crypt/RC2.php b/vendor/phpseclib/phpseclib/phpseclib/Crypt/RC2.php new file mode 100644 index 0000000..654c906 --- /dev/null +++ b/vendor/phpseclib/phpseclib/phpseclib/Crypt/RC2.php @@ -0,0 +1,640 @@ +<?php + +/** + * Pure-PHP implementation of RC2. + * + * Uses mcrypt, if available, and an internal implementation, otherwise. + * + * PHP version 5 + * + * Useful resources are as follows: + * + * - {@link http://tools.ietf.org/html/rfc2268} + * + * Here's a short example of how to use this library: + * <code> + * <?php + * include 'vendor/autoload.php'; + * + * $rc2 = new \phpseclib3\Crypt\RC2('ctr'); + * + * $rc2->setKey('abcdefgh'); + * + * $plaintext = str_repeat('a', 1024); + * + * echo $rc2->decrypt($rc2->encrypt($plaintext)); + * ?> + * </code> + * + * @author Patrick Monnerat <[email protected]> + * @license http://www.opensource.org/licenses/mit-license.html MIT License + * @link http://phpseclib.sourceforge.net + */ + +namespace phpseclib3\Crypt; + +use phpseclib3\Crypt\Common\BlockCipher; +use phpseclib3\Exception\BadModeException; + +/** + * Pure-PHP implementation of RC2. + * + */ +class RC2 extends BlockCipher +{ + /** + * Block Length of the cipher + * + * @see \phpseclib3\Crypt\Common\SymmetricKey::block_size + * @var int + */ + protected $block_size = 8; + + /** + * The Key + * + * @see \phpseclib3\Crypt\Common\SymmetricKey::key + * @see self::setKey() + * @var string + */ + protected $key; + + /** + * The Original (unpadded) Key + * + * @see \phpseclib3\Crypt\Common\SymmetricKey::key + * @see self::setKey() + * @see self::encrypt() + * @see self::decrypt() + * @var string + */ + private $orig_key; + + /** + * Key Length (in bytes) + * + * @see \phpseclib3\Crypt\RC2::setKeyLength() + * @var int + */ + protected $key_length = 16; // = 128 bits + + /** + * The mcrypt specific name of the cipher + * + * @see \phpseclib3\Crypt\Common\SymmetricKey::cipher_name_mcrypt + * @var string + */ + protected $cipher_name_mcrypt = 'rc2'; + + /** + * Optimizing value while CFB-encrypting + * + * @see \phpseclib3\Crypt\Common\SymmetricKey::cfb_init_len + * @var int + */ + protected $cfb_init_len = 500; + + /** + * The key length in bits. + * + * {@internal Should be in range [1..1024].} + * + * {@internal Changing this value after setting the key has no effect.} + * + * @see self::setKeyLength() + * @see self::setKey() + * @var int + */ + private $default_key_length = 1024; + + /** + * The key length in bits. + * + * {@internal Should be in range [1..1024].} + * + * @see self::isValidEnine() + * @see self::setKey() + * @var int + */ + private $current_key_length; + + /** + * The Key Schedule + * + * @see self::setupKey() + * @var array + */ + private $keys; + + /** + * Key expansion randomization table. + * Twice the same 256-value sequence to save a modulus in key expansion. + * + * @see self::setKey() + * @var array + */ + private static $pitable = [ + 0xD9, 0x78, 0xF9, 0xC4, 0x19, 0xDD, 0xB5, 0xED, + 0x28, 0xE9, 0xFD, 0x79, 0x4A, 0xA0, 0xD8, 0x9D, + 0xC6, 0x7E, 0x37, 0x83, 0x2B, 0x76, 0x53, 0x8E, + 0x62, 0x4C, 0x64, 0x88, 0x44, 0x8B, 0xFB, 0xA2, + 0x17, 0x9A, 0x59, 0xF5, 0x87, 0xB3, 0x4F, 0x13, + 0x61, 0x45, 0x6D, 0x8D, 0x09, 0x81, 0x7D, 0x32, + 0xBD, 0x8F, 0x40, 0xEB, 0x86, 0xB7, 0x7B, 0x0B, + 0xF0, 0x95, 0x21, 0x22, 0x5C, 0x6B, 0x4E, 0x82, + 0x54, 0xD6, 0x65, 0x93, 0xCE, 0x60, 0xB2, 0x1C, + 0x73, 0x56, 0xC0, 0x14, 0xA7, 0x8C, 0xF1, 0xDC, + 0x12, 0x75, 0xCA, 0x1F, 0x3B, 0xBE, 0xE4, 0xD1, + 0x42, 0x3D, 0xD4, 0x30, 0xA3, 0x3C, 0xB6, 0x26, + 0x6F, 0xBF, 0x0E, 0xDA, 0x46, 0x69, 0x07, 0x57, + 0x27, 0xF2, 0x1D, 0x9B, 0xBC, 0x94, 0x43, 0x03, + 0xF8, 0x11, 0xC7, 0xF6, 0x90, 0xEF, 0x3E, 0xE7, + 0x06, 0xC3, 0xD5, 0x2F, 0xC8, 0x66, 0x1E, 0xD7, + 0x08, 0xE8, 0xEA, 0xDE, 0x80, 0x52, 0xEE, 0xF7, + 0x84, 0xAA, 0x72, 0xAC, 0x35, 0x4D, 0x6A, 0x2A, + 0x96, 0x1A, 0xD2, 0x71, 0x5A, 0x15, 0x49, 0x74, + 0x4B, 0x9F, 0xD0, 0x5E, 0x04, 0x18, 0xA4, 0xEC, + 0xC2, 0xE0, 0x41, 0x6E, 0x0F, 0x51, 0xCB, 0xCC, + 0x24, 0x91, 0xAF, 0x50, 0xA1, 0xF4, 0x70, 0x39, + 0x99, 0x7C, 0x3A, 0x85, 0x23, 0xB8, 0xB4, 0x7A, + 0xFC, 0x02, 0x36, 0x5B, 0x25, 0x55, 0x97, 0x31, + 0x2D, 0x5D, 0xFA, 0x98, 0xE3, 0x8A, 0x92, 0xAE, + 0x05, 0xDF, 0x29, 0x10, 0x67, 0x6C, 0xBA, 0xC9, + 0xD3, 0x00, 0xE6, 0xCF, 0xE1, 0x9E, 0xA8, 0x2C, + 0x63, 0x16, 0x01, 0x3F, 0x58, 0xE2, 0x89, 0xA9, + 0x0D, 0x38, 0x34, 0x1B, 0xAB, 0x33, 0xFF, 0xB0, + 0xBB, 0x48, 0x0C, 0x5F, 0xB9, 0xB1, 0xCD, 0x2E, + 0xC5, 0xF3, 0xDB, 0x47, 0xE5, 0xA5, 0x9C, 0x77, + 0x0A, 0xA6, 0x20, 0x68, 0xFE, 0x7F, 0xC1, 0xAD, + 0xD9, 0x78, 0xF9, 0xC4, 0x19, 0xDD, 0xB5, 0xED, + 0x28, 0xE9, 0xFD, 0x79, 0x4A, 0xA0, 0xD8, 0x9D, + 0xC6, 0x7E, 0x37, 0x83, 0x2B, 0x76, 0x53, 0x8E, + 0x62, 0x4C, 0x64, 0x88, 0x44, 0x8B, 0xFB, 0xA2, + 0x17, 0x9A, 0x59, 0xF5, 0x87, 0xB3, 0x4F, 0x13, + 0x61, 0x45, 0x6D, 0x8D, 0x09, 0x81, 0x7D, 0x32, + 0xBD, 0x8F, 0x40, 0xEB, 0x86, 0xB7, 0x7B, 0x0B, + 0xF0, 0x95, 0x21, 0x22, 0x5C, 0x6B, 0x4E, 0x82, + 0x54, 0xD6, 0x65, 0x93, 0xCE, 0x60, 0xB2, 0x1C, + 0x73, 0x56, 0xC0, 0x14, 0xA7, 0x8C, 0xF1, 0xDC, + 0x12, 0x75, 0xCA, 0x1F, 0x3B, 0xBE, 0xE4, 0xD1, + 0x42, 0x3D, 0xD4, 0x30, 0xA3, 0x3C, 0xB6, 0x26, + 0x6F, 0xBF, 0x0E, 0xDA, 0x46, 0x69, 0x07, 0x57, + 0x27, 0xF2, 0x1D, 0x9B, 0xBC, 0x94, 0x43, 0x03, + 0xF8, 0x11, 0xC7, 0xF6, 0x90, 0xEF, 0x3E, 0xE7, + 0x06, 0xC3, 0xD5, 0x2F, 0xC8, 0x66, 0x1E, 0xD7, + 0x08, 0xE8, 0xEA, 0xDE, 0x80, 0x52, 0xEE, 0xF7, + 0x84, 0xAA, 0x72, 0xAC, 0x35, 0x4D, 0x6A, 0x2A, + 0x96, 0x1A, 0xD2, 0x71, 0x5A, 0x15, 0x49, 0x74, + 0x4B, 0x9F, 0xD0, 0x5E, 0x04, 0x18, 0xA4, 0xEC, + 0xC2, 0xE0, 0x41, 0x6E, 0x0F, 0x51, 0xCB, 0xCC, + 0x24, 0x91, 0xAF, 0x50, 0xA1, 0xF4, 0x70, 0x39, + 0x99, 0x7C, 0x3A, 0x85, 0x23, 0xB8, 0xB4, 0x7A, + 0xFC, 0x02, 0x36, 0x5B, 0x25, 0x55, 0x97, 0x31, + 0x2D, 0x5D, 0xFA, 0x98, 0xE3, 0x8A, 0x92, 0xAE, + 0x05, 0xDF, 0x29, 0x10, 0x67, 0x6C, 0xBA, 0xC9, + 0xD3, 0x00, 0xE6, 0xCF, 0xE1, 0x9E, 0xA8, 0x2C, + 0x63, 0x16, 0x01, 0x3F, 0x58, 0xE2, 0x89, 0xA9, + 0x0D, 0x38, 0x34, 0x1B, 0xAB, 0x33, 0xFF, 0xB0, + 0xBB, 0x48, 0x0C, 0x5F, 0xB9, 0xB1, 0xCD, 0x2E, + 0xC5, 0xF3, 0xDB, 0x47, 0xE5, 0xA5, 0x9C, 0x77, + 0x0A, 0xA6, 0x20, 0x68, 0xFE, 0x7F, 0xC1, 0xAD + ]; + + /** + * Inverse key expansion randomization table. + * + * @see self::setKey() + * @var array + */ + private static $invpitable = [ + 0xD1, 0xDA, 0xB9, 0x6F, 0x9C, 0xC8, 0x78, 0x66, + 0x80, 0x2C, 0xF8, 0x37, 0xEA, 0xE0, 0x62, 0xA4, + 0xCB, 0x71, 0x50, 0x27, 0x4B, 0x95, 0xD9, 0x20, + 0x9D, 0x04, 0x91, 0xE3, 0x47, 0x6A, 0x7E, 0x53, + 0xFA, 0x3A, 0x3B, 0xB4, 0xA8, 0xBC, 0x5F, 0x68, + 0x08, 0xCA, 0x8F, 0x14, 0xD7, 0xC0, 0xEF, 0x7B, + 0x5B, 0xBF, 0x2F, 0xE5, 0xE2, 0x8C, 0xBA, 0x12, + 0xE1, 0xAF, 0xB2, 0x54, 0x5D, 0x59, 0x76, 0xDB, + 0x32, 0xA2, 0x58, 0x6E, 0x1C, 0x29, 0x64, 0xF3, + 0xE9, 0x96, 0x0C, 0x98, 0x19, 0x8D, 0x3E, 0x26, + 0xAB, 0xA5, 0x85, 0x16, 0x40, 0xBD, 0x49, 0x67, + 0xDC, 0x22, 0x94, 0xBB, 0x3C, 0xC1, 0x9B, 0xEB, + 0x45, 0x28, 0x18, 0xD8, 0x1A, 0x42, 0x7D, 0xCC, + 0xFB, 0x65, 0x8E, 0x3D, 0xCD, 0x2A, 0xA3, 0x60, + 0xAE, 0x93, 0x8A, 0x48, 0x97, 0x51, 0x15, 0xF7, + 0x01, 0x0B, 0xB7, 0x36, 0xB1, 0x2E, 0x11, 0xFD, + 0x84, 0x2D, 0x3F, 0x13, 0x88, 0xB3, 0x34, 0x24, + 0x1B, 0xDE, 0xC5, 0x1D, 0x4D, 0x2B, 0x17, 0x31, + 0x74, 0xA9, 0xC6, 0x43, 0x6D, 0x39, 0x90, 0xBE, + 0xC3, 0xB0, 0x21, 0x6B, 0xF6, 0x0F, 0xD5, 0x99, + 0x0D, 0xAC, 0x1F, 0x5C, 0x9E, 0xF5, 0xF9, 0x4C, + 0xD6, 0xDF, 0x89, 0xE4, 0x8B, 0xFF, 0xC7, 0xAA, + 0xE7, 0xED, 0x46, 0x25, 0xB6, 0x06, 0x5E, 0x35, + 0xB5, 0xEC, 0xCE, 0xE8, 0x6C, 0x30, 0x55, 0x61, + 0x4A, 0xFE, 0xA0, 0x79, 0x03, 0xF0, 0x10, 0x72, + 0x7C, 0xCF, 0x52, 0xA6, 0xA7, 0xEE, 0x44, 0xD3, + 0x9A, 0x57, 0x92, 0xD0, 0x5A, 0x7A, 0x41, 0x7F, + 0x0E, 0x00, 0x63, 0xF2, 0x4F, 0x05, 0x83, 0xC9, + 0xA1, 0xD4, 0xDD, 0xC4, 0x56, 0xF4, 0xD2, 0x77, + 0x81, 0x09, 0x82, 0x33, 0x9F, 0x07, 0x86, 0x75, + 0x38, 0x4E, 0x69, 0xF1, 0xAD, 0x23, 0x73, 0x87, + 0x70, 0x02, 0xC2, 0x1E, 0xB8, 0x0A, 0xFC, 0xE6 + ]; + + /** + * Default Constructor. + * + * @param string $mode + * @throws \InvalidArgumentException if an invalid / unsupported mode is provided + */ + public function __construct($mode) + { + parent::__construct($mode); + + if ($this->mode == self::MODE_STREAM) { + throw new BadModeException('Block ciphers cannot be ran in stream mode'); + } + } + + /** + * Test for engine validity + * + * This is mainly just a wrapper to set things up for \phpseclib3\Crypt\Common\SymmetricKey::isValidEngine() + * + * @see \phpseclib3\Crypt\Common\SymmetricKey::__construct() + * @param int $engine + * @return bool + */ + protected function isValidEngineHelper($engine) + { + switch ($engine) { + case self::ENGINE_OPENSSL: + if ($this->current_key_length != 128 || strlen($this->orig_key) < 16) { + return false; + } + // quoting https://www.openssl.org/news/openssl-3.0-notes.html, OpenSSL 3.0.1 + // "Moved all variations of the EVP ciphers CAST5, BF, IDEA, SEED, RC2, RC4, RC5, and DES to the legacy provider" + // in theory openssl_get_cipher_methods() should catch this but, on GitHub Actions, at least, it does not + if (defined('OPENSSL_VERSION_TEXT') && version_compare(preg_replace('#OpenSSL (\d+\.\d+\.\d+) .*#', '$1', OPENSSL_VERSION_TEXT), '3.0.1', '>=')) { + return false; + } + $this->cipher_name_openssl_ecb = 'rc2-ecb'; + $this->cipher_name_openssl = 'rc2-' . $this->openssl_translate_mode(); + } + + return parent::isValidEngineHelper($engine); + } + + /** + * Sets the key length. + * + * Valid key lengths are 8 to 1024. + * Calling this function after setting the key has no effect until the next + * \phpseclib3\Crypt\RC2::setKey() call. + * + * @param int $length in bits + * @throws \LengthException if the key length isn't supported + */ + public function setKeyLength($length) + { + if ($length < 8 || $length > 1024) { + throw new \LengthException('Key size of ' . $length . ' bits is not supported by this algorithm. Only keys between 1 and 1024 bits, inclusive, are supported'); + } + + $this->default_key_length = $this->current_key_length = $length; + $this->explicit_key_length = $length >> 3; + } + + /** + * Returns the current key length + * + * @return int + */ + public function getKeyLength() + { + return $this->current_key_length; + } + + /** + * Sets the key. + * + * Keys can be of any length. RC2, itself, uses 8 to 1024 bit keys (eg. + * strlen($key) <= 128), however, we only use the first 128 bytes if $key + * has more then 128 bytes in it, and set $key to a single null byte if + * it is empty. + * + * @see \phpseclib3\Crypt\Common\SymmetricKey::setKey() + * @param string $key + * @param int|boolean $t1 optional Effective key length in bits. + * @throws \LengthException if the key length isn't supported + */ + public function setKey($key, $t1 = false) + { + $this->orig_key = $key; + + if ($t1 === false) { + $t1 = $this->default_key_length; + } + + if ($t1 < 1 || $t1 > 1024) { + throw new \LengthException('Key size of ' . $length . ' bits is not supported by this algorithm. Only keys between 1 and 1024 bits, inclusive, are supported'); + } + + $this->current_key_length = $t1; + if (strlen($key) < 1 || strlen($key) > 128) { + throw new \LengthException('Key of size ' . strlen($key) . ' not supported by this algorithm. Only keys of sizes between 8 and 1024 bits, inclusive, are supported'); + } + + $t = strlen($key); + + // The mcrypt RC2 implementation only supports effective key length + // of 1024 bits. It is however possible to handle effective key + // lengths in range 1..1024 by expanding the key and applying + // inverse pitable mapping to the first byte before submitting it + // to mcrypt. + + // Key expansion. + $l = array_values(unpack('C*', $key)); + $t8 = ($t1 + 7) >> 3; + $tm = 0xFF >> (8 * $t8 - $t1); + + // Expand key. + $pitable = self::$pitable; + for ($i = $t; $i < 128; $i++) { + $l[$i] = $pitable[$l[$i - 1] + $l[$i - $t]]; + } + $i = 128 - $t8; + $l[$i] = $pitable[$l[$i] & $tm]; + while ($i--) { + $l[$i] = $pitable[$l[$i + 1] ^ $l[$i + $t8]]; + } + + // Prepare the key for mcrypt. + $l[0] = self::$invpitable[$l[0]]; + array_unshift($l, 'C*'); + + $this->key = pack(...$l); + $this->key_length = strlen($this->key); + $this->changed = $this->nonIVChanged = true; + $this->setEngine(); + } + + /** + * Encrypts a message. + * + * Mostly a wrapper for \phpseclib3\Crypt\Common\SymmetricKey::encrypt, with some additional OpenSSL handling code + * + * @see self::decrypt() + * @param string $plaintext + * @return string $ciphertext + */ + public function encrypt($plaintext) + { + if ($this->engine == self::ENGINE_OPENSSL) { + $temp = $this->key; + $this->key = $this->orig_key; + $result = parent::encrypt($plaintext); + $this->key = $temp; + return $result; + } + + return parent::encrypt($plaintext); + } + + /** + * Decrypts a message. + * + * Mostly a wrapper for \phpseclib3\Crypt\Common\SymmetricKey::decrypt, with some additional OpenSSL handling code + * + * @see self::encrypt() + * @param string $ciphertext + * @return string $plaintext + */ + public function decrypt($ciphertext) + { + if ($this->engine == self::ENGINE_OPENSSL) { + $temp = $this->key; + $this->key = $this->orig_key; + $result = parent::decrypt($ciphertext); + $this->key = $temp; + return $result; + } + + return parent::decrypt($ciphertext); + } + + /** + * Encrypts a block + * + * @see \phpseclib3\Crypt\Common\SymmetricKey::encryptBlock() + * @see \phpseclib3\Crypt\Common\SymmetricKey::encrypt() + * @param string $in + * @return string + */ + protected function encryptBlock($in) + { + list($r0, $r1, $r2, $r3) = array_values(unpack('v*', $in)); + $keys = $this->keys; + $limit = 20; + $actions = [$limit => 44, 44 => 64]; + $j = 0; + + for (;;) { + // Mixing round. + $r0 = (($r0 + $keys[$j++] + ((($r1 ^ $r2) & $r3) ^ $r1)) & 0xFFFF) << 1; + $r0 |= $r0 >> 16; + $r1 = (($r1 + $keys[$j++] + ((($r2 ^ $r3) & $r0) ^ $r2)) & 0xFFFF) << 2; + $r1 |= $r1 >> 16; + $r2 = (($r2 + $keys[$j++] + ((($r3 ^ $r0) & $r1) ^ $r3)) & 0xFFFF) << 3; + $r2 |= $r2 >> 16; + $r3 = (($r3 + $keys[$j++] + ((($r0 ^ $r1) & $r2) ^ $r0)) & 0xFFFF) << 5; + $r3 |= $r3 >> 16; + + if ($j === $limit) { + if ($limit === 64) { + break; + } + + // Mashing round. + $r0 += $keys[$r3 & 0x3F]; + $r1 += $keys[$r0 & 0x3F]; + $r2 += $keys[$r1 & 0x3F]; + $r3 += $keys[$r2 & 0x3F]; + $limit = $actions[$limit]; + } + } + + return pack('vvvv', $r0, $r1, $r2, $r3); + } + + /** + * Decrypts a block + * + * @see \phpseclib3\Crypt\Common\SymmetricKey::decryptBlock() + * @see \phpseclib3\Crypt\Common\SymmetricKey::decrypt() + * @param string $in + * @return string + */ + protected function decryptBlock($in) + { + list($r0, $r1, $r2, $r3) = array_values(unpack('v*', $in)); + $keys = $this->keys; + $limit = 44; + $actions = [$limit => 20, 20 => 0]; + $j = 64; + + for (;;) { + // R-mixing round. + $r3 = ($r3 | ($r3 << 16)) >> 5; + $r3 = ($r3 - $keys[--$j] - ((($r0 ^ $r1) & $r2) ^ $r0)) & 0xFFFF; + $r2 = ($r2 | ($r2 << 16)) >> 3; + $r2 = ($r2 - $keys[--$j] - ((($r3 ^ $r0) & $r1) ^ $r3)) & 0xFFFF; + $r1 = ($r1 | ($r1 << 16)) >> 2; + $r1 = ($r1 - $keys[--$j] - ((($r2 ^ $r3) & $r0) ^ $r2)) & 0xFFFF; + $r0 = ($r0 | ($r0 << 16)) >> 1; + $r0 = ($r0 - $keys[--$j] - ((($r1 ^ $r2) & $r3) ^ $r1)) & 0xFFFF; + + if ($j === $limit) { + if ($limit === 0) { + break; + } + + // R-mashing round. + $r3 = ($r3 - $keys[$r2 & 0x3F]) & 0xFFFF; + $r2 = ($r2 - $keys[$r1 & 0x3F]) & 0xFFFF; + $r1 = ($r1 - $keys[$r0 & 0x3F]) & 0xFFFF; + $r0 = ($r0 - $keys[$r3 & 0x3F]) & 0xFFFF; + $limit = $actions[$limit]; + } + } + + return pack('vvvv', $r0, $r1, $r2, $r3); + } + + /** + * Creates the key schedule + * + * @see \phpseclib3\Crypt\Common\SymmetricKey::setupKey() + */ + protected function setupKey() + { + if (!isset($this->key)) { + $this->setKey(''); + } + + // Key has already been expanded in \phpseclib3\Crypt\RC2::setKey(): + // Only the first value must be altered. + $l = unpack('Ca/Cb/v*', $this->key); + array_unshift($l, self::$pitable[$l['a']] | ($l['b'] << 8)); + unset($l['a']); + unset($l['b']); + $this->keys = $l; + } + + /** + * Setup the performance-optimized function for de/encrypt() + * + * @see \phpseclib3\Crypt\Common\SymmetricKey::setupInlineCrypt() + */ + protected function setupInlineCrypt() + { + // Init code for both, encrypt and decrypt. + $init_crypt = '$keys = $this->keys;'; + + $keys = $this->keys; + + // $in is the current 8 bytes block which has to be en/decrypt + $encrypt_block = $decrypt_block = ' + $in = unpack("v4", $in); + $r0 = $in[1]; + $r1 = $in[2]; + $r2 = $in[3]; + $r3 = $in[4]; + '; + + // Create code for encryption. + $limit = 20; + $actions = [$limit => 44, 44 => 64]; + $j = 0; + + for (;;) { + // Mixing round. + $encrypt_block .= ' + $r0 = (($r0 + ' . $keys[$j++] . ' + + ((($r1 ^ $r2) & $r3) ^ $r1)) & 0xFFFF) << 1; + $r0 |= $r0 >> 16; + $r1 = (($r1 + ' . $keys[$j++] . ' + + ((($r2 ^ $r3) & $r0) ^ $r2)) & 0xFFFF) << 2; + $r1 |= $r1 >> 16; + $r2 = (($r2 + ' . $keys[$j++] . ' + + ((($r3 ^ $r0) & $r1) ^ $r3)) & 0xFFFF) << 3; + $r2 |= $r2 >> 16; + $r3 = (($r3 + ' . $keys[$j++] . ' + + ((($r0 ^ $r1) & $r2) ^ $r0)) & 0xFFFF) << 5; + $r3 |= $r3 >> 16;'; + + if ($j === $limit) { + if ($limit === 64) { + break; + } + + // Mashing round. + $encrypt_block .= ' + $r0 += $keys[$r3 & 0x3F]; + $r1 += $keys[$r0 & 0x3F]; + $r2 += $keys[$r1 & 0x3F]; + $r3 += $keys[$r2 & 0x3F];'; + $limit = $actions[$limit]; + } + } + + $encrypt_block .= '$in = pack("v4", $r0, $r1, $r2, $r3);'; + + // Create code for decryption. + $limit = 44; + $actions = [$limit => 20, 20 => 0]; + $j = 64; + + for (;;) { + // R-mixing round. + $decrypt_block .= ' + $r3 = ($r3 | ($r3 << 16)) >> 5; + $r3 = ($r3 - ' . $keys[--$j] . ' - + ((($r0 ^ $r1) & $r2) ^ $r0)) & 0xFFFF; + $r2 = ($r2 | ($r2 << 16)) >> 3; + $r2 = ($r2 - ' . $keys[--$j] . ' - + ((($r3 ^ $r0) & $r1) ^ $r3)) & 0xFFFF; + $r1 = ($r1 | ($r1 << 16)) >> 2; + $r1 = ($r1 - ' . $keys[--$j] . ' - + ((($r2 ^ $r3) & $r0) ^ $r2)) & 0xFFFF; + $r0 = ($r0 | ($r0 << 16)) >> 1; + $r0 = ($r0 - ' . $keys[--$j] . ' - + ((($r1 ^ $r2) & $r3) ^ $r1)) & 0xFFFF;'; + + if ($j === $limit) { + if ($limit === 0) { + break; + } + + // R-mashing round. + $decrypt_block .= ' + $r3 = ($r3 - $keys[$r2 & 0x3F]) & 0xFFFF; + $r2 = ($r2 - $keys[$r1 & 0x3F]) & 0xFFFF; + $r1 = ($r1 - $keys[$r0 & 0x3F]) & 0xFFFF; + $r0 = ($r0 - $keys[$r3 & 0x3F]) & 0xFFFF;'; + $limit = $actions[$limit]; + } + } + + $decrypt_block .= '$in = pack("v4", $r0, $r1, $r2, $r3);'; + + // Creates the inline-crypt function + $this->inline_crypt = $this->createInlineCryptFunction( + [ + 'init_crypt' => $init_crypt, + 'encrypt_block' => $encrypt_block, + 'decrypt_block' => $decrypt_block + ] + ); + } +} |