python - python aes 加密/解密不返回相同的结果

Question

下面的代码示例在加密/解密操作后不返回原始文本，我试图找出原因

from Crypto.Cipher import AES

text = """This is plain text 
to use.
It should be exqctly 128 characters long to avoid padding and it is split
with new lines as in 
file"""

password = "password........"

block = 32
mode = AES.MODE_CBC

enc = AES.new(password, mode)

encrypted = enc.encrypt(text)

print "ORIGINAL: " + text

print "ENCRYPTED: " + str(encrypted)

print "DECRYPTED: " + str(enc.decrypt(encrypted))

有人能说出为什么文本的第一部分格式错误吗？

Answer 1

我认为，您需要重置初始化向量（IV），以获得所需的结果。最简单的方法可能是创建一个新的 AES 对象进行解密：

enc = AES.new(password, mode)
encrypted = enc.encrypt(text)
print "ORIGINAL: " + text
print "ENCRYPTED: " + str(encrypted)
dec = AES.new(password, mode)
print "DECRYPTED: " + str(dec.decrypt(encrypted))