PYTHON / PHP compatible AES encryption.

encrypt.php

<?php

/**
 * 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 :
 */

function encrypt($key, $iv, $data)
{
    $padding = ceil(strlen($data) / 16) * 16;
    $data = str_pad("$data", $padding, "\x00");
    return base64_encode(openssl_encrypt($data, 'AES-128-CBC', $key, OPENSSL_RAW_DATA|OPENSSL_ZERO_PADDING, $iv));
}

/**
 * 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 $data - data to be decrypted in base64 encoding with iv attached at the end after a :
 * @return decrypted data
 */
function decrypt($key, $iv, $data)
{
    $decrypt = openssl_decrypt(base64_decode($data), 'AES-128-CBC', $key, OPENSSL_RAW_DATA|OPENSSL_ZERO_PADDING, $iv);
    return str_replace("\x00", "", $decrypt);
}

$iv   = 'fedcba9876543210';
$key  = '12345678abcdefgh';

$data = "facebook+1523";
print "To encrypt < 16: $data\n";
$crypted = encrypt($key, $iv, $data);
print "Crypted: $crypted\n";
$decrypted = decrypt($key, $iv, $crypted);
print "Decrypted: $decrypted\n\n";

$data = "facebook+1523543";
print "To encrypt == 16: $data\n";
$crypted = encrypt($key, $iv, $data);
print "Crypted: $crypted\n";
$decrypted = decrypt($key, $iv, $crypted);
print "Decrypted: $decrypted\n\n";

$data = "facebook+152354332";
print "To encrypt > 16: $data\n";
$crypted = encrypt($key, $iv, $data);
print "Crypted: $crypted\n";
$decrypted = decrypt($key, $iv, $crypted);
print "Decrypted: $decrypted\n\n";


/*
RESULT:

To encrypt < 16: facebook+1523
Crypted: oDAXGlc7cQyngARlWmshdA==
Decrypted: facebook+1523

To encrypt == 16: facebook+1523543
Crypted: BGLZf3mdETNSgVqeSQXwNA==
Decrypted: facebook+1523543

To encrypt > 16: facebook+152354332
Crypted: BGLZf3mdETNSgVqeSQXwNA0XXXXfc4bjucOQqUyvaJ4=
Decrypted: facebook+152354332
*/

encrypt.py

import math
import base64

from Crypto.Cipher import AES


def encrypt(key, iv, data):
    padding_size = int(math.ceil(len(data) / 16.0)) * 16
    data = data.ljust(padding_size, '\x00')

    cipher = AES.new(key, AES.MODE_CBC, iv)
    return base64.b64encode(cipher.encrypt(data)).decode('ascii')


def decrypt(key, iv, data):
    cipher = AES.new(key, AES.MODE_CBC, iv)
    return cipher.decrypt(base64.b64decode(data)).replace('\x00', '')


if __name__ == '__main__':
    iv = 'fedcba9876543210'
    key = '12345678abcdefgh'

    data = "facebook+1523"
    print("To encrypt < 16: {}".format(data))
    crypted = encrypt(key, iv, data)
    print("Encriptado: {}".format(crypted))
    decrypted = decrypt(key, iv, crypted)
    print("Decrypted: {}\n".format(decrypted))

    data = "facebook+1523543"
    print("To encrypt == 16: {}".format(data))
    crypted = encrypt(key, iv, data)
    print("Crypted: {}".format(crypted))
    decrypted = decrypt(key, iv, crypted)
    print("Decrypted: {}\n".format(decrypted))

    data = "facebook+152354332"
    print("To encrypt > 16: {}".format(data))
    crypted = encrypt(key, iv, data)
    print("Crypted: {}".format(crypted))
    decrypted = decrypt(key, iv, crypted)
    print("Decrypted: {}\n".format(decrypted))


/*
RESULT:

To encrypt < 16: facebook+1523
Crypted: oDAXGlc7cQyngARlWmshdA==
Decrypted: facebook+1523

To encrypt == 16: facebook+1523543
Crypted: BGLZf3mdETNSgVqeSQXwNA==
Decrypted: facebook+1523543

To encrypt > 16: facebook+152354332
Crypted: BGLZf3mdETNSgVqeSQXwNA0XXXXfc4bjucOQqUyvaJ4=
Decrypted: facebook+152354332
*/