Python上的3DES加密产生与Nodejs/Java不同的结果

Question

我正在建立一个需要信用卡3DES加密的结账台， 但是我在Python和NodeJs上得到了不同的结果

Python代码： （im使用pycryptodome包）

import binascii
import base64
from Crypto.Cipher import DES3
import json

iv = '04njBuE3/dc='
iv = base64.b64decode(iv)
key = 'DpzDLcvVCHdVoRqE/NuIHs0QJ0xFdH2p'
key = base64.b64decode(key)
data = {'CartaoNumero': '0000000000000000',
'CartaoMesAno':'00/0000',
'CartaoSeg': '000',
'CartaoNome':'Teste Teste',
'IdentFatura':'Teste',
'Valor':'1000',
'NomeCliente':'Teste Teste',
'EmailCliente':'teste@teste.com',
'CpfCliente':'11122233344'}
data = json.dumps(data)
data = base64.b64encode(data.encode('utf-8'))
#print (data)

def card_encrypt(iv,key, data):
    desT = DES3.new(key, DES3.MODE_CBC, IV=iv)
    desT_key = desT.encrypt(data)
    desT_key = base64.b64encode(desT_key)
    return (desT_key)

Result: b'+TSfdiGmLAir8RVEze4yr72d3Sm5RBkDBwLYhpv1NKIIfVM+AnIhoSArFzV5am7qOdaFO0Ob4KSS8vXRYnBAO1xyk9MEoNc93uf/53cCMVHbZ8FUx14Vilx3Mg8+kbSMsASki5Dn+hlKE0ElFC/nyiWoOJvkWmtndoL+EEb4rkFil0zg637YXFE7f0yTOWhz97G6CEb4mvegCPpizuVdh2sBQQFDsJMEQE1kGeY2gDiDADwRQiMTrznhWFn3H6SylMxjQaNJTxu820BNitefMgcwAUTUJSrZt6DyuJ59e7772DK2jLubpK8/8xNolKalcjYMx106T7jOxDoPWZEoIe7YSGn9+Z3IGe5R7YFQJVLJUJ3SzlwWLptr3ZbMRnDCh2rB4FbTsM4igic4ZUQjS3DUzUVpT5URQyGjJK9+434ivMehknko4x+1owaEgcLGsPT9zBADlKFQ+OE8JqOhwJ5IztyoWeOmBVPZsOQdYvo='

Nodejs代码：

var secretKey = 'DpzDLcvVCHdVoRqE/NuIHs0QJ0xFdH2p'
 var secretIV = '04njBuE3/dc='
 var dataOfCard = {'CartaoNumero': '0000000000000000',
'CartaoMesAno':'00/0000',
'CartaoSeg': '000',
'CartaoNome':'Teste Teste',
'IdentFatura':'Teste',
'Valor':'1000',
'NomeCliente':'Teste Teste',
'EmailCliente':'teste@teste.com',
'CpfCliente':'11122233344'}

const crypto = require('crypto');
 
async function encryptCardData(dataOfCard, secretKey, secretIV) {
    try {
        const des3_key = new Buffer.from(secretKey, "base64");
        console.log(des3_key)
        const des3_iv = new Buffer.from(secretIV, "base64");
        console.log(des3_iv)
        const cardString = JSON.stringify(dataOfCard);
        console.log(cardString)
      
        const cipher = crypto.createCipheriv('des-ede3-cbc', des3_key, des3_iv);

        const encrypted = cipher.update(cardString, 'utf8', 'base64');
    
        return encrypted + cipher.final('base64');        
    } catch (error) {
        console.error("Error:", error.message);
        throw error;
    }
}

encryptCardData(dataOfCard, secretKey, secretIV)

Result: '7pkXCZCKIDY1ueGwkfLk5W5AnDw2iP4jiZ5YHUBRMd56eDhVyZvnJ6EG+mh/wmHl3ljrJ+sfDMgAbpOgljRRQb4pOc1LQKHdkgcl3ZWmlvmqv8mGKdGaZYTgXnQ9pZGwoUQJAcuQgOCYWD5wMvIA6g4zd8O1iy/IsXWkBEzCkQA3x6NIkwrCNdftogu3JZlbmOIj90flo8t+J2X89rXzQmWKw6uCWrzzfGQvmvqqNf7ecDduTtCXee3WCdvcC3Ar7TbVpSv+NenoK+Oh+Tkj6Y8h4t6YAexyE8HxQ1GqCqFlMAzdCa2TtA=='

节点正在生成正确的结果。 我需要在Python模型上更正什么

Answer 1

Python代码与NodeJS代码不同，原因如下：

• 使用json.dumps()转换为JSON字符串与使用JSON.stringify()转换为JSON字符串略有不同json.dumps()与JSON.stringify()不同，在分隔符后插入空格（为了更好的可读性），请参见here。要避免这种情况，请使用以下修改：

  dataJSON = json.dumps(data, separators=(',', ':'))
  

• 在NodeJS代码中，填充是用PKCS7隐式地完成的，而不是用Python。这里必须显式地执行填充，，PyCryptodome为此提供了一个padding module：

  from Crypto.Util.Padding import pad
  ...
  dataPadded = pad(dataJSON.encode('utf-8'), 8)
  

  8是以字节为单位的3DES块大小

• 必须删除数据的Base64编码：

  #data = base64.b64encode(data.encode('utf-8'))
  

因此：

ciphertext = card_encrypt(iv,key, dataPadded)
print (ciphertext)

返回密文：

b'7pkXCZCKIDY1ueGwkfLk5W5AnDw2iP4jiZ5YHUBRMd56eDhVyZvnJ6EG+mh/wmHl3ljrJ+sfDMgAbpOgljRRQb4pOc1LQKHdkgcl3ZWmlvmqv8mGKdGaZYTgXnQ9pZGwoUQJAcuQgOCYWD5wMvIA6g4zd8O1iy/IsXWkBEzCkQA3x6NIkwrCNdftogu3JZlbmOIj90flo8t+J2X89rXzQmWKw6uCWrzzfGQvmvqqNf7ecDduTtCXee3WCdvcC3Ar7TbVpSv+NenoK+Oh+Tkj6Y8h4t6YAexyE8HxQ1GqCqFlMAzdCa2TtA=='

它与NodeJS代码的密文匹配

请注意，3DES已被弃用，应替换为更现代、更高性能的AES，shere。除此之外，静态IV的使用通常是不安全的