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<?php |
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/** |
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* AesCbc.php |
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* |
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* PHP version 7 |
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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 AesCbc extends Aes |
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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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* 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(string $cyphertext, string $password, int $cost = 0): string |
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{ |
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// Find the IV at the beginning of the cypher text |
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$ivr = Str::substr($cyphertext, 0, self::IVSIZE); |
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// Derive key from password |
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$key = self::key($password, $ivr, $cost, self::mode()); |
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// Gather the checksum portion of the cypher text |
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$sum = Str::substr($cyphertext, self::IVSIZE, self::CKSIZE); |
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// Gather message portion of cyphertext after iv and checksum |
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$msg = Str::substr($cyphertext, self::IVSIZE + self::CKSIZE); |
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// Calculate verification checksum |
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$chk = self::checksum($msg, $ivr, $key, self::mode()); |
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// Verify HMAC before decrypting |
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self::checksumVerify($chk, $sum); |
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// Decrypt message and return |
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return \openssl_decrypt($msg, static::CIPHER, $key, 1, $ivr); |
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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(string $plaintext, string $password, int $cost = 0): string |
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{ |
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// Generate IV of appropriate size. |
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$ivr = \random_bytes(self::IVSIZE); |
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// Derive key from password |
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$key = self::key($password, $ivr, $cost, self::mode()); |
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// Encrypt the plaintext |
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$msg = \openssl_encrypt($plaintext, static::CIPHER, $key, 1, $ivr); |
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// If message could not be encrypted then throw an exception |
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if ($msg === false) { |
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throw new \exception('Could not encrypt the data.'); // @codeCoverageIgnore |
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} |
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// Create the cypher text prefix (iv + checksum) |
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$prefix = $ivr . self::checksum($msg, $ivr, $key, self::mode()); |
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// Return prefix + cyphertext |
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return $prefix . $msg; |
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} |
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} |
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mmeyer2k /
dcrypt
