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Encrypt sensitive data with PHP

Encrypt sensitive data with PHP and MySQL


Class created with construct now add methods to encrypt and decrypt:


class Encryption
{
    const CIPHER = MCRYPT_RIJNDAEL_128; // Rijndael-128 is AES
    const MODE   = MCRYPT_MODE_CBC;

    private $key;
    public function __construct($key) {
        $this->key = $key;
    }

    public function encrypt($plaintext) {
        $ivSize = mcrypt_get_iv_size(self::CIPHER, self::MODE); //Gets the size of the IV belonging to a specific cipher/mode combination.
        $iv = mcrypt_create_iv($ivSize, MCRYPT_DEV_RANDOM); //Creates an initialization vector (IV) from a random source.
        $ciphertext = mcrypt_encrypt(self::CIPHER, $this->key, $plaintext, self::MODE, $iv); //Encrypts the data and returns it.
        return base64_encode($iv.$ciphertext); //Encode Base 64
    }

    public function decrypt($ciphertext) {
        $ciphertext = base64_decode($ciphertext); //Decode Base 64
        $ivSize = mcrypt_get_iv_size(self::CIPHER, self::MODE); //Gets the size of the IV belonging to a specific cipher/mode combination.
        if (strlen($ciphertext) < $ivSize) {
            throw new Exception('Missing initialization vector');
        }

        $iv = substr($ciphertext, 0, $ivSize);
        $ciphertext = substr($ciphertext, $ivSize);
        $plaintext = mcrypt_decrypt(self::CIPHER, $this->key, $ciphertext, self::MODE, $iv); //Decrypts the data and returns it.
        return rtrim($plaintext, "\0");
    }
}

Usage of the class:


$key = "1234567890qbcdefgh"; // Encryption Key
$crypt = new Encryption($key);

$secret = 'secret data'; // your sensitive data

$encrypted_string = $crypt->encrypt($secret); // Encrypt your sensitive data
$decrypted_string = $crypt->decrypt($encrypted_string); // Decrypt your encrypted string.

// Show Results
echo $secret;
echo $encrypted_string;
echo $decrypted_string;

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