使用DES/3DES与python

Question

python中使用des/3des进行加密/解密的最佳模块/包是什么.有人可以提供示例来使用python上的des/3des加密数据.

Answer 1

pyDes可用于DES和3DES.样品用法:

from pyDes import *

data = "Please encrypt my data"
k = des("DESCRYPT", CBC, "\0\0\0\0\0\0\0\0", pad=None, padmode=PAD_PKCS5)
d = k.encrypt(data)
print "Encrypted: %r" % d
print "Decrypted: %r" % k.decrypt(d)
assert k.decrypt(d, padmode=PAD_PKCS5) == data

另一种选择是Chillkat Python加密库,它支持许多加密算法(包括DES和3DES),但它不是免费的.样品用法:

crypt.put_CryptAlgorithm("des")
crypt.put_CipherMode("cbc")
crypt.put_KeyLength(64)
crypt.put_PaddingScheme(0)
crypt.put_EncodingMode("hex")
ivHex = "0001020304050607"
crypt.SetEncodedIV(ivHex,"hex")
keyHex = "0001020304050607"
crypt.SetEncodedKey(keyHex,"hex")
encStr = crypt.encryptStringENC("The quick brown fox jumps over the lazy dog.")
print encStr
decStr = crypt.decryptStringENC(encStr)
print decStr

无论如何,我希望你知道现在DES和3DES都不被认为是安全的,有很多更好的选择(如果你想坚持标准,首先是AES,或者Twofish,Blowfish等......)

Answer 2

您可以将M2Crypto Python包装器用于OpenSSL.它具有快速(与OpenSSL一样快)的优点,但文档的缺点是有限的.

以下是我对"如何使用M2Crypto包装器在Python中加密3DES？ "的回答中的示例.

with open(keyfile, 'rb') as f:
    key = f.read()
encrypt = 1
cipher = Cipher(alg='des_ede3_ecb', key=key, op=encrypt, iv='\0'*16)
ciphertext = cipher.update(plaintext)
ciphertext += cipher.final()