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 directory/sub-directory 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出现此异常的文件是 .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)

我是这样加密的：

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： python3.6

def 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)

使用 AES 加密时的字节问题

byte problems while encrypting with AES

python

encryption

byte

aes