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<?php |
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/** |
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* Mcrypt.php |
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* |
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* PHP version 5 |
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* |
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* @category Dcrypt |
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* @package Dcrypt |
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* @author Michael Meyer (mmeyer2k) <[email protected]> |
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* @license http://opensource.org/licenses/MIT The MIT License (MIT) |
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* @link https://github.com/mmeyer2k/dcrypt |
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*/ |
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namespace Dcrypt; |
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/** |
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* Symmetric Mcrypt wrapper functions. |
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* |
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* Features: |
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* - PKCS #7 padding of messages |
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* - random IV selection |
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* - checksum validation with HMAC |
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* - tested to be compatible with many ciphers, modes and hashing algorithms. |
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* - highly customizable, but default options are most secure |
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* |
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* @category Dcrypt |
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* @package Dcrypt |
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* @author Michael Meyer (mmeyer2k) <[email protected]> |
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* @license http://opensource.org/licenses/MIT The MIT License (MIT) |
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* @link https://github.com/mmeyer2k/dcrypt |
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* @link https://apigen.ci/github/mmeyer2k/dcrypt/namespace-Dcrypt.html |
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*/ |
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final class Mcrypt extends Cryptobase |
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{ |
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/** |
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* Decrypt cyphertext |
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* |
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* @param string $cyphertext Cypher text to decrypt |
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* @param string $password Password that should be used to decrypt input data |
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* @param int $cost Number of HMAC iterations to perform on key |
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* @param string $cipher Mcrypt cipher |
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* @param string $mode Mcrypt mode |
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* @param string $algo Hashing algorithm to use for internal operations |
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* |
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* @return string|boolean Returns false on checksum validation failure |
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*/ |
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public static function decrypt($cyphertext, $password, $cost = 0, $cipher = MCRYPT_RIJNDAEL_128, $mode = MCRYPT_MODE_CBC, $algo = 'sha256') |
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{ |
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// Determine that size of the IV in bytes |
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$ivsize = \mcrypt_get_iv_size($cipher, $mode); |
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// Find the IV at the beginning of the cypher text |
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$iv = Str::substr($cyphertext, 0, $ivsize); |
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// Gather the checksum portion of the cypher text |
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$chksum = Str::substr($cyphertext, $ivsize, Str::hashSize($algo)); |
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// Gather message portion of cyphertext after iv and checksum |
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$message = Str::substr($cyphertext, $ivsize + Str::hashSize($algo)); |
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// Derive key from password |
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$key = self::key($password, $iv, $cost, $cipher, $mode, $algo); |
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// Calculate verification checksum |
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$verify = self::checksum($message, $iv, $key, $cipher, $mode, $algo); |
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// If checksum could not be verified return false |
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self::checksumVerify($verify, $chksum); |
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// Decrypt unpad return |
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return Pkcs7::unpad(\mcrypt_decrypt($cipher, $key, $message, $mode, $iv)); |
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} |
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/** |
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* Encrypt plaintext |
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* |
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* @param string $plaintext Plaintext string to encrypt |
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* @param string $password Key used to encrypt data |
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* @param int $cost Number of HMAC iterations to perform on key |
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* @param string $cipher Mcrypt cipher |
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* @param string $mode Mcrypt mode |
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* @param string $algo Hashing algorithm to use for internal operations |
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* |
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* @return string |
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*/ |
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public static function encrypt($plaintext, $password, $cost = 0, $cipher = MCRYPT_RIJNDAEL_128, $mode = MCRYPT_MODE_CBC, $algo = 'sha256') |
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{ |
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// Pad the input string to a multiple of block size |
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$padded = Pkcs7::pad($plaintext, \mcrypt_get_block_size($cipher, $mode)); |
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// Generate IV of appropriate size |
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$iv = Random::bytes(\mcrypt_get_iv_size($cipher, $mode)); |
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// Derive key from password |
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$key = self::key($password, $iv, $cost, $cipher, $mode, $algo); |
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// Encrypt the plaintext |
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$message = \mcrypt_encrypt($cipher, $key, $padded, $mode, $iv); |
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// If message could not be encrypted then throw an exception |
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if ($message === false) { |
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throw new \exception('Could not encrypt the data.'); |
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} |
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1 |
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// Create the cypher text prefix (iv + checksum) |
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$prefix = $iv . self::checksum($message, $iv, $key, $cipher, $mode, $algo); |
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// Return prefix + cyphertext |
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return $prefix . $message; |
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} |
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} |
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mmeyer2k /
dcrypt
