拉莫斯之舞

我將通過一些更正重新發(fā)布您的代碼（我不想掩蓋您的版本）。當您的代碼正常工作時，它不會檢測到填充周圍的一些錯誤。特別是，如果提供的解密密鑰不正確，則填充邏輯可能會做一些奇怪的事情。如果您同意我的更改，則可以更新您的解決方案。from hashlib import md5from Crypto.Cipher import AESfrom Crypto import Randomdef derive_key_and_iv(password, salt, key_length, iv_length):? ? d = d_i = ''? ? while len(d) < key_length + iv_length:? ? ? ? d_i = md5(d_i + password + salt).digest()? ? ? ? d += d_i? ? return d[:key_length], d[key_length:key_length+iv_length]# This encryption mode is no longer secure by today's standards.# See note in original question above.def obsolete_encrypt(in_file, out_file, password, key_length=32):? ? bs = AES.block_size? ? salt = Random.new().read(bs - len('Salted__'))? ? key, iv = derive_key_and_iv(password, salt, key_length, bs)? ? cipher = AES.new(key, AES.MODE_CBC, iv)? ? out_file.write('Salted__' + salt)? ? finished = False? ? while not finished:? ? ? ? chunk = in_file.read(1024 * bs)? ? ? ? if len(chunk) == 0 or len(chunk) % bs != 0:? ? ? ? ? ? padding_length = bs - (len(chunk) % bs)? ? ? ? ? ? chunk += padding_length * chr(padding_length)? ? ? ? ? ? finished = True? ? ? ? out_file.write(cipher.encrypt(chunk))def decrypt(in_file, out_file, password, key_length=32):? ? bs = AES.block_size? ? salt = in_file.read(bs)[len('Salted__'):]? ? key, iv = derive_key_and_iv(password, salt, key_length, bs)? ? cipher = AES.new(key, AES.MODE_CBC, iv)? ? next_chunk = ''? ? finished = False? ? while not finished:? ? ? ? chunk, next_chunk = next_chunk, cipher.decrypt(in_file.read(1024 * bs))? ? ? ? if len(next_chunk) == 0:? ? ? ? ? ? padding_length = ord(chunk[-1])? ? ? ? ? ? if padding_length < 1 or padding_length > bs:? ? ? ? ? ? ? ?raise ValueError("bad decrypt pad (%d)" % padding_length)? ? ? ? ? ? # all the pad-bytes must be the same? ? ? ? ? ? if chunk[-padding_length:] != (padding_length * chr(padding_length)):? ? ? ? ? ? ? ?# this is similar to the bad decrypt:evp_enc.c from openssl program? ? ? ? ? ? ? ?raise ValueError("bad decrypt")? ? ? ? ? ? chunk = chunk[:-padding_length]? ? ? ? ? ? finished = True? ? ? ? out_file.write(chunk)

總結

以上是生活随笔為你收集整理的python怎样打开加密的文件_如何在Python中解密OpenSSL AES加密的文件？的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。