module QyWechat::Prpcrypt

Public Instance Methods

decrypt(aes_key, text, corpid) click to toggle source

对密文进行解密. text 需要解密的密文

# File lib/qy_wechat/helpers/prpcrypt.rb, line 8
def decrypt(aes_key, text, corpid)
  status = 200
  text        = Base64.decode64(text)
  text        = handle_cipher(:decrypt, aes_key, text)
  result      = PKCS7Encoder.decode(text)
  content     = result[16...result.length]
  len_list    = content[0...4].unpack("N")
  xml_len     = len_list[0]
  xml_content = content[4...4 + xml_len]
  from_corpid = content[xml_len+4...content.size]
  # TODO: refactor
  if corpid != from_corpid
    Rails.logger.debug("#{__FILE__}:#{__LINE__} Failure because corpid != from_corpid")
    status = 401
  end
  [xml_content, status]
end
encrypt(aes_key, text, corpid) click to toggle source

加密

# File lib/qy_wechat/helpers/prpcrypt.rb, line 27
def encrypt(aes_key, text, corpid)
  text    = text.force_encoding("ASCII-8BIT")
  random  = SecureRandom.hex(8)
  msg_len = [text.length].pack("N")
  text    = "#{random}#{msg_len}#{text}#{corpid}"
  text    = PKCS7Encoder.encode(text)
  text    = handle_cipher(:encrypt, aes_key, text)
  Base64.encode64(text)
end

Private Instance Methods

handle_cipher(action, aes_key, text) click to toggle source
# File lib/qy_wechat/helpers/prpcrypt.rb, line 38
def handle_cipher(action, aes_key, text)
  cipher = OpenSSL::Cipher.new('AES-256-CBC')
  cipher.send(action)
  cipher.padding = 0
  cipher.key     = aes_key
  cipher.iv      = aes_key[0...16]
  cipher.update(text) + cipher.final
end