SpomkyLabs\Jose\Algorithm\ContentEncryption\AESMCrypt

Complexity

Total Complexity

4

Size/Duplication

Total Lines	40
Duplicated Lines	0 %

Coupling/Cohesion

Components	0
Dependencies	1

Importance

Changes	1
Bugs	0	Features	0

4 Methods

Rating	Name	Duplication	Size	Complexity
A	encrypt()	0	10	1
A	decrypt()	0	10	1
A	pad()	0	7	1
A	unpad()	0	7	1

<?php

/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2014-2016 Spomky-Labs
 *
 * This software may be modified and distributed under the terms
 * of the MIT license.  See the LICENSE file for details.
 */

namespace SpomkyLabs\Jose\Algorithm\ContentEncryption;

use Jose\Util\StringUtil;

/**
 */
final class AESMCrypt implements AESInterface
{
    public static function encrypt($data, $k, $iv)
    {
        $resource = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, '');
        $padded_text = self::pad($data, 16);
        mcrypt_generic_init($resource, $k, $iv);
        $cipherText = mcrypt_generic($resource, $padded_text);
        mcrypt_generic_deinit($resource);

        return $cipherText;
    }

    public static function decrypt($data, $k, $iv)
    {
        $resource = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, '');
        mcrypt_generic_init($resource, $k, $iv);
        $decrypted = mdecrypt_generic($resource, $data);
        mcrypt_generic_deinit($resource);
        $decrypted_text = self::unpad($decrypted);

        return $decrypted_text;
    }

    private static function pad($data, $block_size)
    {
        $padding = $block_size - (StringUtil::getStringLength($data) % $block_size);
        $pattern = chr($padding);

        return $data.str_repeat($pattern, $padding);
    }

    private static function unpad($data)
    {
        $padChar = StringUtil::getSubString($data, -1);
        $padLength = ord($padChar);

        return StringUtil::getSubString($data, 0, -$padLength);
    }
}