如何将128 CFB转换为Ruby?

时间:2014-10-15 17:45:33

标签: php ruby encryption aes mcrypt

我需要使用PHP API来交换请求和答案。在我这边我是在rails 4.0.0(ruby 2.0),我无法使它工作。

我已经阅读了很多有关此主题的答案,并尝试了解mcrypt的工作原理,例如: http://www.chilkatsoft.com/p/php_aes.asp,但没有成功。我仍然无法解密从PHP加密或加密PHP可以解密的东西

你能帮助我,看看我做错了吗?

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:

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

2 个答案:

答案 0 :(得分:5)

您必须在PHP代码中使用'ncfb'而不是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与Ruby中的PHP兼容。我在OpenSSL文档中阅读CFB文档后猜到了这一点。

非常感谢this Q/A on IT security,我才发现因为我知道我在寻找什么。

答案 1 :(得分:1)

看看https://github.com/kingpong/ruby-mcrypt

在你的gem文件中添加

gem "ruby-mcrypt", :lib => "mcrypt"

<强>用法

crypto = Mcrypt.new(:twofish, :cbc, MY_KEY, MY_IV, :pkcs)

# encryption and decryption in one step
ciphertext = crypto.encrypt(plaintext)
plaintext  = crypto.decrypt(ciphertext)

# encrypt in smaller steps
while chunk = $stdin.read(4096)
  $stdout << crypto.encrypt_more(chunk)
end
$stdout << crypto.encrypt_finish

# or decrypt:
while chunk = $stdin.read(4096)
  $stdout << crypto.decrypt_more(chunk)
end
$stdout << crypto.decrypt_finish

您还可以查看https://stackoverflow.com/a/21489711/1380867