Class: Wechat::Callback::MessageDecryption

Inherits:
Object
  • Object
show all
Extended by:
Wechat::Core::Common
Defined in:
lib/wechat/callback/message_decryption.rb

Overview

Message Decryption 是消息解密类。

Class Method Summary collapse

Class Method Details

.create(encoded_message, encoded_aes_keys) ⇒ Object

消息加解密 mp.weixin.qq.com/wiki/6/90f7259c0d0739bbb41d9f4c4c8e59a2.html

解密方式如下：

  1. aes_msg = Base64_Decode(msg_encrypt)

  2. rand_msg = AES_Decrypt(aes_msg)



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# File 'lib/wechat/callback/message_decryption.rb', line 16

def self.create(encoded_message, encoded_aes_keys)

  assert_present! :encoded_message,  encoded_message
  assert_present! :encoded_aes_keys, encoded_aes_keys

  encrypted_message = Base64.decode64(encoded_message).bytes.inject('') do |buffer, byte| buffer += [ byte ].pack 'C' end
  aes_keys          = encoded_aes_keys.map { |encoded_aes_key| Base64.decode64 "#{encoded_aes_key}=" }

  cipher = OpenSSL::Cipher::AES.new(256, 'CBC')
  cipher.decrypt
  cipher.padding = 0
  cipher.key     = aes_keys.first

  cipher.update(encrypted_message)+cipher.final

end