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<?php |
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/** |
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* Aes.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 AES-256-CBC encryption functions powered by OpenSSL. |
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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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class Aes extends Cryptobase |
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{ |
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/** |
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* AES-256 cipher identifier that will be passed to openssl |
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* |
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* @var string |
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*/ |
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const CIPHER = 'aes-256-cbc'; |
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/** |
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* Size of initialization vector in bytes |
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* |
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* @var int |
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*/ |
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const IVSIZE = 16; |
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/** |
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* Size of checksum in bytes |
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* |
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* @var int |
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*/ |
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const CKSIZE = 32; |
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/** |
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* This string is used when hashing to ensure cross compatibility between |
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* dcrypt\mcrypt and dcrypt\aes. |
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*/ |
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const RIJNDA = 'rijndael-128'; |
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/** |
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* Decrypt cyphertext |
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* |
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* @param string $cyphertext Cyphertext to decrypt |
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* @param string $password Password that should be used to decrypt input data |
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* @param int $cost Number of extra HMAC iterations to perform on key |
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* |
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* @return string |
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*/ |
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public static function decrypt($cyphertext, $password, $cost = 0) |
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{ |
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// Find the IV at the beginning of the cypher text |
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$iv = Str::substr($cyphertext, 0, self::IVSIZE); |
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// Gather the checksum portion of the cypher text |
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$chksum = Str::substr($cyphertext, self::IVSIZE, self::CKSIZE); |
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// Gather message portion of cyphertext after iv and checksum |
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$message = Str::substr($cyphertext, self::IVSIZE + self::CKSIZE); |
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// Derive key from password |
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$key = self::key($password, $iv, $cost, self::RIJNDA, self::mode()); |
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// Calculate verification checksum |
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$verify = self::checksum($message, $iv, $key, self::RIJNDA, self::mode()); |
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// Verify HMAC before decrypting |
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self::checksumVerify($verify, $chksum); |
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// Decrypt message and return |
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return \openssl_decrypt($message, static::CIPHER, $key, 1, $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 Password used to encrypt data. |
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* @param int $cost Number of extra HMAC iterations to perform on key |
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* |
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* @return string |
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*/ |
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public static function encrypt($plaintext, $password, $cost = 0) |
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{ |
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// Generate IV of appropriate size. |
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$iv = Random::bytes(self::IVSIZE); |
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// Derive key from password |
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$key = self::key($password, $iv, $cost, self::RIJNDA, self::mode()); |
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// Encrypt the plaintext |
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$message = \openssl_encrypt($plaintext, static::CIPHER, $key, 1, $iv); |
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// If message could not be encrypted then throw an exception |
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if ($message === false) { |
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throw new \exception('Could not encrypt the data.'); |
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} |
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// Create the cypher text prefix (iv + checksum) |
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$prefix = $iv . self::checksum($message, $iv, $key, self::RIJNDA, self::mode()); |
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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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* Return the encryption mode string. "cbc" or "ctr" |
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* |
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* @return string |
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*/ |
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protected static function mode() |
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{ |
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return substr(static::CIPHER, -3); |
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} |
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} |
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mmeyer2k /
dcrypt
