예제 #1
0
파일: Otp.php 프로젝트: dopecode/dcrypt
 /**
  * Encrypt or decrypt a binary input string.
  * 
  * @param string $input    Input data to encrypt
  * @param string $password Encryption/decryption key to use on input
  * @param string $algo     Hashing algo to generate keystream
  * 
  * @return string
  */
 public static function crypt($input, $password, $algo = 'sha512')
 {
     $chunks = \str_split($input, Str::hashSize($algo));
     foreach ($chunks as $i => &$chunk) {
         $chunk = $chunk ^ \hash($algo, $password . $i, true);
     }
     return \implode($chunks);
 }
예제 #2
0
파일: Mcrypt.php 프로젝트: dopecode/dcrypt
 /**
  * Decrypt cyphertext
  * 
  * @param string $cyphertext Cypher text to decrypt
  * @param string $password   Password that should be used to decrypt input data
  * @param int    $cost       Number of HMAC iterations to perform on key
  * @param string $cipher     Mcrypt cipher
  * @param string $mode       Mcrypt mode
  * @param string $algo       Hashing algorithm to use for internal operations
  * 
  * @return string|boolean Returns false on checksum validation failure
  */
 public static function decrypt($cyphertext, $password, $cost = 0, $cipher = MCRYPT_RIJNDAEL_128, $mode = MCRYPT_MODE_CBC, $algo = 'sha256')
 {
     // Determine that size of the IV in bytes
     $ivsize = \mcrypt_get_iv_size($cipher, $mode);
     // Find the IV at the beginning of the cypher text
     $iv = Str::substr($cyphertext, 0, $ivsize);
     // Gather the checksum portion of the cypher text
     $chksum = Str::substr($cyphertext, $ivsize, Str::hashSize($algo));
     // Gather message portion of cyphertext after iv and checksum
     $message = Str::substr($cyphertext, $ivsize + Str::hashSize($algo));
     // Derive key from password
     $key = self::key($password, $iv, $cost, $cipher, $mode, $algo);
     // Calculate verification checksum
     $verify = self::checksum($message, $iv, $key, $cipher, $mode, $algo);
     // If checksum could not be verified return false
     self::checksumVerify($verify, $chksum);
     // Decrypt unpad return
     return Pkcs7::unpad(\mcrypt_decrypt($cipher, $key, $message, $mode, $iv));
 }