如何解决Ruby+OpenSSL 3DES加密后多了8字节的问题

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问题描述：

       明文“abcdefgHabcdefgH”  用key:”abcdefgH12345678“ 加密后的密文应该是 "ec3f23575fea50b2ec3f23575fea50b2。但使用Ruby+openssl的结果是"ec3f23575fea50b2ec3f23575fea50b2  9eda321f26b6909f  "， 多出了后面的8字节：  9eda321f26b6909f

    # abcdefgHabcdefgH => ["ec3f23575fea50b2ec3f23575fea50b29eda321f26b6909f"](7D8jV1/qULLsPyNXX+pQsp7aMh8mtpCf)  key:`abcdefgH12345678` OK
    # abcdefgHabcdefgH => ["ec3f23575fea50b2ec3f23575fea50b2"](7D8jV1/qULLsPyNXX+pQsg==)  key:`abcdefgH12345678` OK

原因：

填充方法的使用问题

解决后的代码：

明文的长度必须是8的整数倍，否则会报错：:in `final': data not multiple of block length (OpenSSL::Cipher::CipherError)

require 'openssl'

module Des3
  # puts  OpenSSL::Cipher.ciphers
  def self.cipher(mode, key , data)
    # cipher = OpenSSL::Cipher.new('DES-EDE3-CBC').send(mode)
    # cipher = OpenSSL::Cipher.new('DES-EDE3').send(mode) # 192 bits KEY
    cipher = OpenSSL::Cipher.new('DES-EDE').send(mode) # 128 bits key
    # cipher = OpenSSL::Cipher.new('DES3').send(mode)  # 192 bits KEY
    cipher.key = key
    cipher.padding =0 #!!! 0：加密后不会多出8bytes
    # key:`abcdefgH12345678`, `abcdefgHabcdefgH`` => `["ec3f23575fea50b2ec3f23575fea50b2"]`(7D8jV1/qULLsPyNXX+pQsg==)   OK
    # key:`abcdefgH12345678`, `abcdefgHabcdefgH`` => `["ec3f23575fea50b2ec3f23575fea50b29eda321f26b6909f"]`(7D8jV1/qULLsPyNXX+pQsp7aMh8mtpCf)   OK
    encrypted = ''
    encrypted << cipher.update(data)
    encrypted << cipher.final
    encrypted
  end
 

  def self.encrypt(key,   data)
    cipher(:encrypt, key,   data)
  end

  def self.decrypt(key,  data)
    cipher(:decrypt, key,    data)
  end
end

def test_case(dat)
  key, data, dataExpected = dat[:key], dat[:data], dat[:dataExpected].downcase.gsub(" ","")
  dataEnrypted = Des3::encrypt(key ,data)
  dataDecrypted =  Des3::decrypt(key ,dataEnrypted)
  print("key:`#{key}` `#{data}` => 0x:#{dataEnrypted.unpack("H*")[0]}  #{dataDecrypted==data ? 'OK' : "FAIL"} #{dataExpected==dataEnrypted.unpack("H*")[0] ? 'OK' : "FAIL(Expected:#{dataExpected})"} \n")
  puts "  key0x:#{key.unpack("H*")[0]},  0x:#{data.unpack("H*")[0]} => 0x:#{dataEnrypted.unpack("H*")[0]}  #{dataDecrypted==data ? 'OK' : 'FAIL'}  #{dataExpected==dataEnrypted.unpack("H*")[0] ? 'OK' : 'FAIL'} "
end

def unit_test
  dat1=[
    {key:"abcdefgH12345678", data:"abcdefgHabcdefgH", dataExpected:"ec3f23575fea50b2ec3f23575fea50b2"},
    {key:"\x12\x34\x56\x78\x90\x12\x34\x56\xab\xcd\xef\x12\x34\x56\x78\x90",data:"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",dataExpected:"c4 fe a9 c5 6c 89 64 11 c4 fe a9 c5 6c 89 64 11"},
    ]
  dat1.each do |dat| test_case(dat) end
end

unit_test

运行结果

key:`abcdefgH12345678` `abcdefgHabcdefgH` => 0x:ec3f23575fea50b2ec3f23575fea50b2  OK OK
  key0x:61626364656667483132333435363738,  0x:61626364656667486162636465666748 => 0x:ec3f23575fea50b2ec3f23575fea50b2  OK  OK
key:`4Vx�4V���4Vx�` `                ` => 0x:c4fea9c56c896411c4fea9c56c896411  OK OK
  key0x:1234567890123456abcdef1234567890,  0x:00000000000000000000000000000000 => 0x:c4fea9c56c896411c4fea9c56c896411  OK  OK

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