在Ruby中解密PHP MCRYPT_RIJNDAEL_256 [英] Decrypting PHP MCRYPT_RIJNDAEL_256 in Ruby

问题描述

我有一个充满加密密码的数据库，我需要在Ruby中解密该密码才能进行平台更​​改.如何将该PHP代码移植到Ruby?曾尝试在具有AES_256的Ruby中使用OpenSSL，但收到错误解密"错误，以及我的密钥($ salt)不够长的错误.

I have a database filled with encrypted passwords that I need to decrypt in Ruby for a platform change. How can I port this PHP code to Ruby? Have tried to use OpenSSL in Ruby with AES_256 but getting 'Bad Decrypt' errors and also errors that my key ($salt) isn't long enough.

在下面的示例中，$ salt是25个字符串.

In the example below, $salt is a 25 character string.

这是PHP解密功能:

function decrypt_password($text, $salt)
{
    return trim(mcrypt_decrypt(MCRYPT_RIJNDAEL_256,
        $salt, base64_decode($text), MCRYPT_MODE_ECB, 
        mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB),
        MCRYPT_RAND)));
}

推荐答案

MCRYPT_RIJNDAEL_256算法不能实现em，不能实现AES，它使用256位块大小来实现Rijndael.这不是默认模式，您可以在此处.

MCRYPT_RIJNDAEL_256 algorithm does not implement AES, it implements Rijndael using a 256 bit block size. This is not a default mode, you can find an implementation for Ruby here.

此外，您似乎正在使用$salt变量作为键.密钥会自动扩展到下一个可用的密钥大小.对于25个 byte 密钥，我假设将使用256位(32字节)密钥.这是$salt值，扩展了值为00的字节.请注意，我假定每个字符在您的系统上都被编码为单个字节.

Furthermore, you seem to be using the $salt variable as a key. Keys are automatically extended to the next available key size. For 25 byte keys I presume a 256 bit (32 byte) key will be used. This is the $salt value, extended with bytes valued 00. Note that I'm presuming that each character is encoded as a single byte on your system.

最后一个惊喜是，您可以放心地忽略代码的mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB), MCRYPT_RAND)部分，因为ECB模式不使用IV，因此它返回的值被完全忽略.请注意，对字符串使用ECB模式-当然也对密码使用-是不安全的.

As a final surprise, you may safely disregard the mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB), MCRYPT_RAND) part of the code, as ECB mode does not use an IV, so the value it returns is fully ignored. Note that using ECB mode for strings - and therefore also passwords of course - is not secure.

您至少应使用随机IV的AES CBC.而且，您应该考虑使用 bcrypt 而不是如果您不需要密码本身的值，则进行加密.

You should, at the very minimum use AES CBC with a random IV. And you should consider using bcrypt instead of encryption if you don't need the value of the passwords itself.

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