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<?php /** * http://stackoverflow.com/questions/9262109/php-simplest-two-way-encryption/30189841#30189841 * * This is not safe to use */ class UnsafeCrypto { const METHOD = 'aes-256-ctr'; /** * Encrypts (but does not authenticate) a message * * @param string $message - plaintext message * @param string $key - encryption key (raw binary expected) * @param boolean $encode - set to TRUE to return a base64-encoded * @return string (raw binary) */ public static function encrypt($message, $key, $encode = false) { $nonceSize = openssl_cipher_iv_length(self::METHOD); $nonce = openssl_random_pseudo_bytes($nonceSize); $ciphertext = openssl_encrypt( $message, self::METHOD, $key, OPENSSL_RAW_DATA, $nonce ); // Now let's pack the IV and the ciphertext together // Naively, we can just concatenate if ($encode) { return base64_encode($nonce.$ciphertext); } return $nonce.$ciphertext; } /** * Decrypts (but does not verify) a message * * @param string $message - ciphertext message * @param string $key - encryption key (raw binary expected) * @param boolean $encoded - are we expecting an encoded string? * @return string */ public static function decrypt($message, $key, $encoded = false) { if ($encoded) { $message = base64_decode($message, true); if ($message === false) { throw new Exception('Encryption failure'); } } $nonceSize = openssl_cipher_iv_length(self::METHOD); $nonce = mb_substr($message, 0, $nonceSize, '8bit'); $ciphertext = mb_substr($message, $nonceSize, null, '8bit'); $plaintext = openssl_decrypt( $ciphertext, self::METHOD, $key, OPENSSL_RAW_DATA, $nonce ); return $plaintext; } } class SaferCrypto extends UnsafeCrypto { const HASH_ALGO = 'sha256'; /** * Encrypts then MACs a message * * @param string $message - plaintext message * @param string $key - encryption key (raw binary expected) * @param boolean $encode - set to TRUE to return a base64-encoded string * @return string (raw binary) */ public static function encrypt($message, $key, $encode = false) { list($encKey, $authKey) = self::splitKeys($key); // Pass to UnsafeCrypto::encrypt $ciphertext = parent::encrypt($message, $encKey); // Calculate a MAC of the IV and ciphertext $mac = hash_hmac(self::HASH_ALGO, $ciphertext, $authKey, true); if ($encode) { return base64_encode($mac.$ciphertext); } // Prepend MAC to the ciphertext and return to caller return $mac.$ciphertext; } /** * Decrypts a message (after verifying integrity) * * @param string $message - ciphertext message * @param string $key - encryption key (raw binary expected) * @param boolean $encoded - are we expecting an encoded string? * @return string (raw binary) */ public static function decrypt($message, $key, $encoded = false) { list($encKey, $authKey) = self::splitKeys($key); if ($encoded) { $message = base64_decode($message, true); if ($message === false) { throw new Exception('Encryption failure'); } } // Hash Size -- in case HASH_ALGO is changed $hs = mb_strlen(hash(self::HASH_ALGO, '', true), '8bit'); $mac = mb_substr($message, 0, $hs, '8bit'); $ciphertext = mb_substr($message, $hs, null, '8bit'); $calculated = hash_hmac( self::HASH_ALGO, $ciphertext, $authKey, true ); if (!self::hashEquals($mac, $calculated)) { throw new Exception('Encryption failure'); } // Pass to UnsafeCrypto::decrypt $plaintext = parent::decrypt($ciphertext, $encKey); return $plaintext; } /** * Splits a key into two separate keys; one for encryption * and the other for authenticaiton * * @param string $masterKey (raw binary) * @return array (two raw binary strings) */ protected static function splitKeys($masterKey) { // You really want to implement HKDF here instead! return [ hash_hmac(self::HASH_ALGO, 'ENCRYPTION', $masterKey, true), hash_hmac(self::HASH_ALGO, 'AUTHENTICATION', $masterKey, true) ]; } /** * Compare two strings without leaking timing information * * @param string $a * @param string $b * @return boolean */ protected static function hashEquals($a, $b) { if (function_exists('hash_equals')) { return hash_equals($a, $b); } $nonce = openssl_random_pseudo_bytes(32); return hash_hmac(self::HASH_ALGO, $a, $nonce) === hash_hmac(self::HASH_ALGO, $b, $nonce); } } $message = 'dmNPaTJveDdYN1MxQURUenRjTmEzM2ExRWd4ZW9iL0J4SzFoRWx1QjczeUZDV3VtdXhySEFsbldkNFd4ZlJnTGJZNmlGQ0tBNU9ZMXVZWXM4UDdIRms5bFJwcEd1ODI5VVA0QkU2aUVJd29FVXZhNW5ZRHE5NHhueFNmd1ArU05SQkNTZnZaTlcyc3VDbnFBMzNzRXluTDFyQnZjeXU0WXJTTUU0cVA2NmdVPXxDVHFmR1pOdHM4M3hTaWJkQTlRNjN4R1hNeFhaSUplNTNodHpaNXBKSUJvPQ=='; $key = hex2bin('000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f'); $encrypted = SaferCrypto::encrypt($message, $key, true); $decrypted = SaferCrypto::decrypt($message, $key, true); var_dump($encrypted, $decrypted);
based on r7Ms8
Output for 7.0.0 - 7.1.7
Fatal error: Uncaught Exception: Encryption failure in /in/svtos:133 Stack trace: #0 /in/svtos(180): SaferCrypto::decrypt('vcOi2ox7X7S1ADT...', '\x00\x01\x02\x03\x04\x05\x06\x07\x08\t\n\v\f\r\x0E...', true) #1 {main} thrown in /in/svtos on line 133
Process exited with code 255.
Output for 5.4.29 - 5.6.28
Fatal error: Uncaught exception 'Exception' with message 'Encryption failure' in /in/svtos:133 Stack trace: #0 /in/svtos(180): SaferCrypto::decrypt('dmNPaTJveDdYN1M...', '\x00\x01\x02\x03\x04\x05\x06\x07\x08\t\n\v\f\r\x0E...', true) #1 {main} thrown in /in/svtos on line 133
Process exited with code 255.
Output for 5.4.27 - 5.4.28
Fatal error: Uncaught exception 'Exception' with message 'Encryption failure' in /in/svtos:133 Stack trace: #0 /in/svtos(180): SaferCrypto::decrypt('dmNPaTJveDdYN1M...', '\x00\x01\x02\x03\x04\x05\x03\x04\x05\x03\x04\x05\x03\x04\x05\x03\x04\x05\x03\x04\x05true) #1 {main} thrown in /in/svtos on line 133
Process exited with code 255.
Output for 5.4.15 - 5.4.26
Fatal error: Uncaught exception 'Exception' with message 'Encryption failure' in /in/svtos:133 Stack trace: #0 /in/svtos(180): SaferCrypto::decrypt('dmNPaTJveDdYN1M...', '???????????????...', true) #1 {main} thrown in /in/svtos on line 133
Process exited with code 255.
Output for 5.4.0 - 5.4.14
Fatal error: Call to undefined function openssl_cipher_iv_length() in /in/svtos on line 21
Process exited with code 255.
Output for 5.3.19 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/svtos on line 152
Process exited with code 255.