如何将128 CFB加密到Ruby？ [英] How can I mcrypt 128 CFB to Ruby?

问题描述

我需要交换一个隐藏请求和答案的PHP API。在我身边，我在rails 4.0.0（ruby 2.0），我不能使它工作。

我已经阅读了关于这个主题的很多答案，并试图了解mcrypt的工作原理，例如 http://www.chilkatsoft.com/p/php_aes.asp ，但没有成功。我仍然无法解密加密的PHP或加密PHP可以解密的东西

你能帮我看看我做错了什么？

PHP代码

  $ secretKey =1234567891234567; 
 $ encrypt = urlencode（base64_encode（mcrypt_encrypt（
 MCRYPT_RIJNDAEL_128，
 md5（$ secretKey））
 $ cleartext，
 MCRYPT_MODE_CFB，
 $ secretKey 
）））; 
 
 $ input = urldecode（$ input）; 
 $ decrypt = mcrypt_decrypt（MCRYPT_RIJNDAEL_128，
 md5（$ secretKey），
 base64_decode（$ input），
 MCRYPT_MODE_CFB，
 $ secretKey）; 
  

Ruby代码

$ b $
密码= OpenSSL :: Cipher :: AES.new（256，：CFB）
密码。
cipher.key = Digest :: MD5.hexdigest（1234567891234567）
cipher.iv =1234567891234567
encrypted = cipher.update（params.to_query）+ cipher.final

CGI.escape（Base64.strict_encode64（加密））
end

def self.decode（answer）
decrypted = Base64.decode64（CGI。 unescape（answer））

解密= OpenSSL :: Cipher :: AES.new（256，：CFB）
decipher.decrypt
decipher.key = Digest :: MD5。 hexdigest（1234567891234567）
decipher.iv =1234567891234567
decoded = decipher.update（decryptpted）+ decipher.final
end
/ pre>

解决方案

你必须使用'ncfb' code> PHP代码中的MCRYPT_MODE_CFB 。 PHP默认为8位反馈，而不是整个块大小的反馈。

或者您可以指定：CFB8 在Ruby中与PHP兼容。在OpenSSL文档中阅读CFB的文档后，我猜这个。

非常感谢这个Q / A的IT安全性，我才发现，因为我知道我在寻找什么。 >

I need to exchange with a PHP API which crypts the requests and answers. On my side I am in rails 4.0.0 (ruby 2.0) and I cannot make it work.

I have read a lot of answers on this subject and have tried to understand how mcrypt works, e.g. http://www.chilkatsoft.com/p/php_aes.asp, but without success. I still cannot decrypt the encrypted from PHP or encrypt something that the PHP can decrypt

Could you help me please and see what I am doing wrong?

PHP code:

$secretKey = "1234567891234567";
$encrypt = urlencode( base64_encode( mcrypt_encrypt(
             MCRYPT_RIJNDAEL_128,
             md5($secretKey),
             $cleartext,
             MCRYPT_MODE_CFB,
             $secretKey
           ) ) );

$input = urldecode($input);
$decrypt = mcrypt_decrypt( MCRYPT_RIJNDAEL_128,
                           md5($secretKey),
                           base64_decode($input),
                           MCRYPT_MODE_CFB,
                           $secretKey );

Ruby code:

def self.encode(params = {})
  cipher = OpenSSL::Cipher::AES.new(256, :CFB)
  cipher.encrypt
  cipher.key = Digest::MD5.hexdigest("1234567891234567")
  cipher.iv = "1234567891234567"
  encrypted = cipher.update(params.to_query) + cipher.final

  CGI.escape(Base64.strict_encode64(encrypted))
end

def self.decode(answer)
  decrypted = Base64.decode64(CGI.unescape(answer))

  decipher = OpenSSL::Cipher::AES.new(256, :CFB)
  decipher.decrypt
  decipher.key = Digest::MD5.hexdigest("1234567891234567")
  decipher.iv = "1234567891234567"
  decoded = decipher.update(decrypted) + decipher.final
end

解决方案

You have to use 'ncfb' instead of MCRYPT_MODE_CFB in the PHP code. PHP defaults to an 8 bit feed back instead of a feed back of the full block size.

Alternatively you can specify :CFB8 to be compatible with PHP in Ruby. This one I guessed after reading the documentation for CFB in the OpenSSL documentation.

Many thanks to this Q/A on IT security which I only found because I knew what I was looking for.

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