PHP_AES_CHIPER

AES CHIPER

class PHP_AES_Cipher {

    private static $OPENSSL_CIPHER_NAME = "aes-128-cbc"; //Name of OpenSSL Cipher 
    private static $CIPHER_KEY_LEN = 16; //128 bits

    /**
     * Encrypt data using AES Cipher (CBC) with 128 bit key
     * 
     * @param type $key - key to use should be 16 bytes long (128 bits)
     * @param type $iv - initialization vector
     * @param type $data - data to encrypt
     * @return encrypted data in base64 encoding with iv attached at end after a :
     */

    static function encryp_my($key, $iv, $data) {
        if (strlen($key) < PHP_AES_Cipher::$CIPHER_KEY_LEN) {
            $key = str_pad("$key", PHP_AES_Cipher::$CIPHER_KEY_LEN, "0"); //0 pad to len 16
        } else if (strlen($key) > PHP_AES_Cipher::$CIPHER_KEY_LEN) {
            $key = substr($key, 0, PHP_AES_Cipher::$CIPHER_KEY_LEN); //truncate to 16 bytes
        }
        
        $encodedEncryptedData = base64_encode(openssl_encrypt($data, PHP_AES_Cipher::$OPENSSL_CIPHER_NAME, $key, OPENSSL_RAW_DATA, $iv));
        $encodedIV = base64_encode($iv);
        $encryptedPayload = $encodedEncryptedData.":".$encodedIV;
        
        return $encryptedPayload;
        
    }

    /**
     * Decrypt data using AES Cipher (CBC) with 128 bit key
     * 
     * @param type $key - key to use should be 16 bytes long (128 bits)
     * @param type $data - data to be decrypted in base64 encoding with iv attached at the end after a :
     * @return decrypted data
     */
    static function decrypt_my($key, $data) {
        if (strlen($key) < PHP_AES_Cipher::$CIPHER_KEY_LEN) {
            $key = str_pad("$key", PHP_AES_Cipher::$CIPHER_KEY_LEN, "0"); //0 pad to len 16
        } else if (strlen($key) > PHP_AES_Cipher::$CIPHER_KEY_LEN) {
            $key = substr($key, 0, PHP_AES_Cipher::$CIPHER_KEY_LEN); //truncate to 16 bytes
        }
        
        $parts = explode(':', $data); //Separate Encrypted data from iv.
        $decryptedData = openssl_decrypt(base64_decode($parts[0]), PHP_AES_Cipher::$OPENSSL_CIPHER_NAME, $key, OPENSSL_RAW_DATA, base64_decode($parts[1]));
        
        return $decryptedData;
    }

}

function generateRandomString($length = 24) {
    $characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
    $charactersLength = strlen($characters);
    $randomString = '';
    for ($i = 0; $i < $length; $i++) {
        $randomString .= $characters[rand(0, $charactersLength - 1)];
    }
    return $randomString;
}

//Cara Penggunaannya Encrypt
~===========================~
$iv = generateRandomString(16); #Same as in JAVA
$key = generateRandomString(24).'=='; #Same as in JAVA
$data = "data yang di encrypt";
$data_encrypt = \PHP_AES_Cipher::encryp_my($key, $iv, $data).':'.$key;

//Cara Penggunaannya Decrypt
~===========================~
$data_encrypt ="MWCkYOtUSlc5Be/enZAIZ0mGf6hex/gefyqB/HFNXEo=:ODlrY055MDRieHBteDNmUg==:T5MaTCSPq40TdgxiGQkjuA1r==";
$data = substr($data_encrypt, 0, strlen($data_encrypt) -27);
$key = substr($data_encrypt, -26);
$data_decrypt = \PHP_AES_Cipher::decrypt_my($key, $data);