使用 AES 加密时的字节问题

Question

我使用 Crypto.cipher 编写了一个代码，它将遍历目录/子目录中的所有文件并使用 AES-ECB 对其进行加密。现在的问题是，由于某种原因我得到这个错误：raise ValueError("Error %d while encrypting in ECB mode" % result) ValueError: Error 3 while encrypting in ECB mode我尝试将字节转换为 base64，但我仍然遇到同样的问题，起初我认为它可能只是某些文件以不同的方式编码，但后来我查看了列表和一些给出这个的文件例外是 .txt，其中只有一些数字，所以我不确定问题出在哪里。with open(loc, 'rb') as file:     data = file.read()     Edata = Encrypt(data)这就是我加密它的方式：def Encrypt(msg): #AES    pad = lambda x: x + (SIZE - len(x) % SIZE) * PADDING    print(type(msg))    msg = pad(msg)    cipher = AES.new(hkey,AES.MODE_ECB)    cipherTxt = cipher.encrypt(msg)    return cipherTxt编辑：python 3.6def Decrypt(msg): #AES    decipher = AES.new(hkey,AES.MODE_ECB)    plain = decipher.decrypt(msg)    index = plain.find(b".")    original = msg[:index]    return original

Answer 1

加密二进制数据适用于我的加密包（来自 anaconda）。您可能正在使用不同的包 - 如果您尝试加密字符串，我的包会出错。这可能只是一个稻草人，但这对我有用：

from Crypto.Cipher import AES

from Crypto.Hash import SHA256

import random

password = "temp"

hashObj = SHA256.new(password.encode("utf-8"))

hkey = hashObj.digest()

def Encrypt(msg, blocksize=16):

    """encrypt msg with padding to blocksize. Padding rule is to fill with

    NUL up to the final character which is the padding size as an 8-bit

    integer (retrieved as `msg[-1]`)

    """

    assert blocksize > 2 and blocksize < 256

    last = len(msg) % blocksize

    pad = blocksize - last

    random_pad = bytes(random.sample(range(255), pad-1))

    msg = msg + random_pad + bytes([pad])

    cipher = AES.new(hkey,AES.MODE_ECB)

    cipherTxt = cipher.encrypt(msg)

    return cipherTxt

def Decrypt(msg): #AES

    decipher = AES.new(hkey,AES.MODE_ECB)

    print('msg size', len(msg))

    plain = decipher.decrypt(msg)

    print('plain', plain)

    original = plain[:-plain[-1]]

    return original

# test binary data

sample = bytes(range(41))

print('sample', sample)

encrypted = Encrypt(sample, 16)

print('encrypted', encrypted)

print(len(sample), len(encrypted))

decrypted = Decrypt(encrypted)

print('decrypted', decrypted)

print('matched', decrypted == sample)

# test blocksize boundary

sample = bytes(range(48))

decrypted = Decrypt(Encrypt(sample))

print('on blocksize', sample==decrypted)