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<?php // Define a 32-byte (64 character) hexadecimal encryption key // Note: The same encryption key used to encrypt the data must be used to decrypt the data define('ENCRYPTION_KEY', 'd0a7e7997b6d5fcd55f4b5c32611b87cd923e88837b63bf2941ef819dc8ca282'); // Encrypt Function function mc_encrypt($encrypt, $key){ $encrypt = serialize($encrypt); $iv = mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_CBC), MCRYPT_DEV_URANDOM); $key = pack('H*', $key); $mac = hash_hmac('sha256', $encrypt, substr(bin2hex($key), -32)); $passcrypt = mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $key, $encrypt.$mac, MCRYPT_MODE_CBC, $iv); $encoded = base64_encode($passcrypt).'|'.base64_encode($iv); return $encoded; } // Decrypt Function function mc_decrypt($decrypt, $key){ $decrypt = explode('|', $decrypt.'|'); $decoded = base64_decode($decrypt[0]); $iv = base64_decode($decrypt[1]); if(strlen($iv)!==mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_CBC)){ return false; } $key = pack('H*', $key); $decrypted = trim(mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $key, $decoded, MCRYPT_MODE_CBC, $iv)); $mac = substr($decrypted, -64); $decrypted = substr($decrypted, 0, -64); $calcmac = hash_hmac('sha256', $decrypted, substr(bin2hex($key), -32)); if($calcmac!==$mac){ return false; } $decrypted = unserialize($decrypted); return $decrypted; } echo '<h1>Rijndael 256-bit CBC Encryption Function</h1>'; $data = 'Super secret confidential string data.'; $encrypted_data = mc_encrypt('pssst ... đon’t tell anyøne!', ENCRYPTION_KEY); echo '<h2>Example #1: String Data</h2>'; echo 'Data to be Encrypted: ' . $data . '<br/>'; echo 'Encrypted Data: ' . $encrypted_data . '<br/>'; echo 'Decrypted Data: ' . mc_decrypt($encrypted_data, ENCRYPTION_KEY) . '</br>'; $data = array(1, 5, 8, 9, 22, 10, 61); $encrypted_data = mc_encrypt($data, ENCRYPTION_KEY); echo '<h2>Example #2: Non-String Data</h2>'; echo 'Data to be Encrypted: <pre>'; print_r($data); echo '</pre><br/>'; echo 'Encrypted Data: ' . $encrypted_data . '<br/>'; echo 'Decrypted Data: <pre>'; print_r(mc_decrypt($encrypted_data, ENCRYPTION_KEY)); echo '</pre>'; ?>