用Ruby加密字节数据

Question

我正在用Ruby做一个关于AES加密的项目。Ruby的加密库以字符串的形式获取数据并开始对其进行加密，例如(http://ruby-doc.org/stdlib-2.0.0/libdoc/openssl/rdoc/OpenSSL/Cipher.html)。然而，我有一个字节数组数据，如；

seed_V = [0x08,0x06,0x02,0x01,0x03,0x07,0x01]

我想以字节为单位提供数据，并像Java或C# do ( Using AES encryption in C#)那样进行加密，我如何在Ruby中实现相同类型的加密呢？

Answer 1

考虑到我们使用的是AES-CBC：

require 'openssl'

class AesCrypto     
  def encrypt(iv, data)
    aes = ::OpenSSL::Cipher.new('AES-128-CBC')
    aes.encrypt
    aes.iv = iv
    aes.key = ciphering_key
    aes.update(data) + aes.final
  end

  def decrypt(iv, encrypted_data)
    aes = ::OpenSSL::Cipher.new('AES-128-CBC')
    aes.decrypt
    aes.iv = iv
    aes.key = ciphering_key
    aes.update(encrypted_data) + aes.final
  end

  private

  def ciphering_key
    # get from config or storage, etc
    'test_key_test_key'
  end
end

请注意，iv长度应该等于该CBC的块大小。

seed_v = [0x08,0x06,0x02,0x01,0x03,0x07,0x01,0x08,0x06,0x02,0x01,0x03,0x07,0x01,0x08,0x01]
iv = seed_v.pack('C*')
data = "hello!"

crypto = AesCrypto.new
ciphertext = crypto.encrypt(iv, data)
puts ciphertext
data = crypto.decrypt(iv, ciphertext)
puts data

如果您不确定如何选择iv，这是一个有用的答案。

CBC with a fixed or random IV

Answer 2

您可以将字节数组打包到字符串中：

seed_V = [0x08,0x06,0x02,0x01,0x03,0x07,0x01]
=> [8, 6, 2, 1, 3, 7, 1]

seed_V.pack('C*')
=> "\b\x06\x02\x01\x03\a\x01"

seed_V.pack('C*').unpack('C*')
=> [8, 6, 2, 1, 3, 7, 1]

http://www.rubydoc.info/stdlib/core/Array%3Apack