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@joshhartman
Last active November 25, 2022 10:10
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Rijndael 256-bit Encryption (CBC) Class
<?php
class Crypt {
private $key;
function __construct($key){
$this->setKey($key);
}
public function encrypt($encrypt){
$encrypt = serialize($encrypt);
$iv = mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_CBC), MCRYPT_DEV_URANDOM);
$key = pack('H*', $this->key);
$mac = hash_hmac('sha256', $encrypt, substr($this->key, -32));
$passcrypt = mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $key, $encrypt . $mac, MCRYPT_MODE_CBC, $iv);
$encoded = base64_encode($passcrypt) . '|' . base64_encode($iv);
return $encoded;
}
public function decrypt($decrypt){
$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*', $this->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', $decrypted, substr($this->key, -32));
if($calcmac !== $mac){
return false;
}
$decrypted = unserialize($decrypted);
return $decrypted;
}
public function setKey($key){
if(ctype_xdigit($key) && strlen($key) === 64){
$this->key = $key;
}else{
trigger_error('Invalid key. Key must be a 32-byte (64 character) hexadecimal string.', E_USER_ERROR);
}
}
}
$crypt = new Crypt('d0a7e7997b6d5fcd55f4b5c32611b87cd923e88837b63bf2941ef819dc8ca282');
echo '<h1>Rijndael 256-bit CBC Encryption Function</h1>';
$data = 'Super secret confidential string data.';
$encrypted_data = $crypt->encrypt($data);
echo '<h2>Example #1: String Data</h2>';
echo 'Data to be Encrypted: ' . $data . '<br/>';
echo 'Encrypted Data: ' . $encrypted_data . '<br/>';
echo 'Decrypted Data: ' . $crypt->decrypt($encrypted_data) . '</br>';
$data = array(1, 5, 8, new DateTime(), 22, 10, 61, array('apple' => array('red', 'green')));
$encrypted_data = $crypt->encrypt($data);
echo '<h2>Example #2: Non-String Data</h2>';
echo 'Data to be Encrypted: <pre>';
print_r($data);
echo '</pre><br/>';
echo 'Encrypted Data: ' . $encrypted_data . '<br/>';
echo 'Decrypted Data: <pre>';
print_r($crypt->decrypt($encrypted_data));
echo '</pre>';
@xcount
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xcount commented Jun 1, 2017

The above class is deprecated in php 7.1
Could someone upgrade?

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