rails加密/解密

Question

我需要在我的rails应用程序中进行加密和解密.我试图使用ezcrypto,但每当我做解密时,我得到这个错误.

OpenSSL::Cipher::CipherError in ProfilesController#show

wrong final block length

需要更改什么才能阻止此错误.我尝试使用另一种openssl实现(从我的模型中调用的方法)

def encrypt_attr(unencrypted)
    c = OpenSSL::Cipher.new("aes-256-cbc")
    c.encrypt
    c.key = Digest::SHA1.hexdigest('pass')
    e = c.update(unencrypted)
    e << c.final
    return e
end

def decrypt_attr(encrypted_attr)
  if encrypted_attr != ""
    c = OpenSSL::Cipher::Cipher.new("aes-256-cbc")
    c.decrypt
    c.key = Digest::SHA1.hexdigest('pass')
    d = c.update(encrypted_attr)
    d << c.final
    return d
  end
end

它会在解密时抛出完全相同的错误.我该怎么做加密和解密而不是这个openssl错误.

Answer 1

require 'openssl'
require 'base64'

class AesEncryptDecrypt

  KEY = "EncryptDecryptGurudathBN"
  ALGORITHM = 'AES-128-ECB'

  def self.encryption(msg)
    begin
      cipher = OpenSSL::Cipher.new(ALGORITHM)
      cipher.encrypt()
      cipher.key = KEY
      crypt = cipher.update(msg) + cipher.final()
      crypt_string = (Base64.encode64(crypt))
      return crypt_string
    rescue Exception => exc
      puts ("Message for the encryption log file for message #{msg} = #{exc.message}")
    end
  end

  def self.decryption(msg)
    begin
      cipher = OpenSSL::Cipher.new(ALGORITHM)
      cipher.decrypt()
      cipher.key = KEY
      tempkey = Base64.decode64(msg)
      crypt = cipher.update(tempkey)
      crypt << cipher.final()
      return crypt
    rescue Exception => exc
      puts ("Message for the decryption log file for message #{msg} = #{exc.message}")
    end
  end
end

加密

irb(main):007:0> AesEncryptDecrypt.encryption('gurudath')
=> "rUPKObydUJd9cY9agm3Glw==\n"

解密

irb(main):008:0> AesEncryptDecrypt.decryption('rUPKObydUJd9cY9agm3Glw==')
=> "gurudath"

Answer 2

我知道 Ruby 包的文档非常少openssl。但是，如果您想使用密码块链接，这里有一个简短的代码片段，概述了如何使用AES-256-CBC密码：

require 'openssl'

# your data
raw  = 'the data to be encrypted goes here'
pwd  = 'secret'
salt = OpenSSL::Random.random_bytes(8)

# prepare cipher for encryption
e = OpenSSL::Cipher.new('AES-256-CBC')
e.encrypt
# next, generate a PKCS5-based string for your key + initialization vector 
key_iv = OpenSSL::PKCS5.pbkdf2_hmac_sha1(pwd, salt, 2000, e.key_len+e.iv_len)
key = key_iv[0, e.key_len]
iv  = key_iv[e.key_len, e.iv_len]

# now set the key and iv for the encrypting cipher
e.key = key
e.iv  = iv

# encrypt the data!
encrypted = '' << e.update(raw) << e.final
p encrypted

# and now we prepare to decrypt
d = OpenSSL::Cipher.new('AES-256-CBC')
d.decrypt
# now set the key and iv for the decrypting cipher
# this assumes that the password, salt, and iv are known,
# so then you would be able to generate the key as per above
d.key = key
d.iv  = iv

# decrypt the data!
decrypted = '' << d.update(encrypted) << d.final
p decrypted

这段代码几乎是逐字摘自Ruby 标准库文档的日语（原始？）版本openssl。但是，它确实给您和您的应用程序设计提出了一些问题：

1. 您需要保存该salt值。它与密码一起使用来生成密钥（您不需要保存密钥）。
2. 您需要保存iv初始化向量。这用于启动密码块链中的第一个块。无需加密该值，但应为您加密的每条消息生成该值。

祝你好运！