AES-pycrypto加密在node.js加密解密

Question

我看了AES - Encryption with Crypto (node-js)/decryption with Pycrypto (python)后，因为我试图做的完全相反，但我似乎无法得到它的权利。这是我到目前为止已经试过......

Python的加密

import base64 
from Crypto import Random 
from Crypto.Cipher import AES 

text_file = open("cryptic.txt", "w") 

pad = lambda s: s + (BS - len(s) % BS) * chr(BS - len(s) % BS) 
unpad = lambda s : s[:-ord(s[len(s)-1:])] 

plaintxt = 'dolladollabillzz' 
iv = Random.new().read(AES.block_size) 
print AES.block_size 
key = 'totallyasecret!!' 
cipher = AES.new(key=key, mode=AES.MODE_CBC, IV=iv) 
encrypted = base64.b64encode(iv + cipher.encrypt(plaintxt)) 

text_file.write(encrypted) 
text_file.close() 

Node.js的解密

var fs = require('fs'); 
var crypto = require('crypto'); 
var Buffer = require('buffer').Buffer; 

var algorithm = 'aes-128-cbc'; 
var key = new Buffer('totallyasecret!!', 'binary'); 

var cryptic = fs.readFileSync('./cryptic.txt', 'base64'); 
var iv = cryptic.slice(0, 16); 
var ciphertext = cryptic.slice(16); 

var decipher = crypto.createDecipheriv(algorithm, key, iv); 
var decrypted = [decipher.update(ciphertext)]; 
decrypted.push(decipher.final('utf8')); 
var finished = Buffer.concat(decrypted).toString('utf8'); 
console.log(finished); 

每次我尝试运行Node.js的解密，我结束了与错误消息：

Error: error:0606506D:digital envelope routines:EVP_DecryptFinal_ex:wrong final block length 

Answer 1

由于IV是在Python随机产生的，它可以包含任何可能的字节VAL UE。其中一些字节值不是有效的UTF-8字符（例如，多个字节是一个字符），并且可能导致错误地切断IV，从而使实际密文轻微移位。

由于AES是分组密码，所以这些比特必须排队以便正确解密。这应该修复它：

var cryptic = fs.readFileSync('./cryptic.txt', 'utf8'); 
cryptic = new Buffer(cryptic, 'base64'); 
var iv = cryptic.slice(0, 16); 
var ciphertext = cryptic.slice(16); 

这将二进制字符串更改为完美处理二进制数据的缓冲区。