AES-python中的Pycrypto加密和节点中的加密解密。js

Question

我已经看过了AES-Encryption with Crypto（node js）/decryption with Pycrypto（python）的文章，因为我正试图做完全相反的事情，但我似乎做得不对。这是我到目前为止试过的。。。

Python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()

节点。js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);

每次我尝试运行节点时。js解密，我最终得到错误消息：

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

Answer 1

因为IV是在Python中随机生成的，所以它可以包含任何可能的字节值。那些字节值中的一些不是有效的UTF-8字符（例如多个字节是一个字符）并且可能导致被错误地切掉IV，从而使实际的密文稍微偏移。

因为AES是一个分组密码，所以位必须排队才能被正确解密。这应该可以解决它：

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

这会将二进制字符串更改为完全处理二进制数据的缓冲区。