准备在PHP 7.2中删除Mcrypt [英] Preparing for removal of Mcrypt in PHP 7.2

问题描述

因此随着时间的推移，mcrypt将在PHP 7.2中使用. 当然，还有一种选择:openssl.

So as time moves on mcrypt will go in PHP 7.2. Of course there is an alternative: openssl.

我发现很难使用AES 256 CBC和保留IV从mcrypt切换到openssl.我对密码学有点陌生，所以我并不真正了解所有内容，但我了解基本知识.

I find it difficult to switch from mcrypt to openssl, using AES 256 CBC and preserving IVs. I am sort of new to cryptography, so I don't really know everything, but I understand the basics.

假设我有以下代码

function encrypt($masterPassword, $data) 
{
    $keySize = mcrypt_get_key_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_CBC);
    $ivSize = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_CBC);
    $iv = mcrypt_create_iv($ivSize, MCRYPT_DEV_URANDOM);
    $key = mb_substr(hash('SHA256', $masterPassword), 0, $keySize);
    $encrypted = mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $key, $data, MCRYPT_MODE_CBC, $iv);
    return base64_encode($iv . $encrypted);
}

function decrypt($masterPassword, $base64) 
{
    $keySize = mcrypt_get_key_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_CBC);
    $ivSize = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_CBC);
    $key = mb_substr(hash('SHA256', $masterPassword), 0, $keySize);
    $data = base64_decode($base64);
    $iv = substr($data, 0, $ivSize);
    $encrypted = substr($data, $ivSize, strlen($data));
    $decrypted = mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $key, $encrypted, MCRYPT_MODE_CBC, $iv);
    return trim($decrypted);
}

如何转换"此代码以使用由mcrypt插入的openssl?

How can I "convert" this code to use openssl insted of mcrypt?

推荐答案

您无法进行转换，因为Rijndael-256不是AES-256，并且OpenSSL扩展不附带Rijndael-256支持. > AES-256是具有256位(32字节)密钥的Rijndael-128.

You can't convert it, because Rijndael-256 is not AES-256, and the OpenSSL extension doesn't ship with Rijndael-256 support.
AES-256 is Rijndael-128 with a 256-bit (32-byte) key.

不幸的是，您必须重新加密所有数据.

Unfortunately, you'll have to re-encrypt all of your data.

另外，您当前正在使用的方案存在一些问题:

Also, the scheme you're currently using has some problems:

• 它缺乏身份验证(HMAC是用PHP进行身份验证的最简单方法)
• 它缺少适当的填充(具有零字节的mcrypt填充；您需要像PKCS#5填充之类的东西)，这是块模式加密安全所必需的.
• 它不是字节安全的(您正在使用mb_substr())

好消息是OpenSSL将自动为您执行PKCS#5填充，但您应该走得更远，并使用

The good news is that OpenSSL will do PKCS#5 padding for you automatically, but you should go even further and use a solid encryption library like defuse/php-encryption.

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