python基于pyDes库实现des加密的方法_Python

python基于pyDes库实现des加密的方法

2020-10-05 11:31SunboyL Python

这篇文章主要介绍了python基于pyDes库实现des加密的方法,结合实例形式较为详细的分析了pyDes库的下载、安装及使用pyDes库进行加密的相关操作技巧,需要的朋友可以参考下

本文实例讲述了python基于pyDes库实现des加密的方法。分享给大家供大家参考，具体如下：

下载及简介地址：https://twhiteman.netfirms.com/des.html

如需要在python中使用des加密，可以直接使用pyDes库加密，该库提供了CBC和ECB两种加密方式。

1、Windows下安装

下载后pyDes-x.x.x.zip并解压后，里面有setup.py文件，使用命令 setup.py --help可查看详细使用。

你可以使用命令python setup.py install命令安装，也可以直接将压缩包内的pyDes.py拷贝到本地的python lib库下直接开始使用

2、使用

使用参数如下（拷贝自上述提供的地址）：

Class initialization
--------------------
pyDes.des(key, [mode], [IV], [pad], [padmode])
pyDes.triple_des(key, [mode], [IV], [pad], [padmode])
key     -> Bytes containing the encryption key. 8 bytes for DES, 16 or 24 bytes
    for Triple DES
mode    -> Optional argument for encryption type, can be either
    pyDes.ECB (Electronic Code Book) or pyDes.CBC (Cypher Block Chaining)
IV      -> Optional Initial Value bytes, must be supplied if using CBC mode.
    Length must be 8 bytes.
pad     -> Optional argument, set the pad character (PAD_NORMAL) to use during
    all encrypt/decrpt operations done with this instance.
padmode -> Optional argument, set the padding mode (PAD_NORMAL or PAD_PKCS5)
    to use during all encrypt/decrpt operations done with this instance.
I recommend to use PAD_PKCS5 padding, as then you never need to worry about any
padding issues, as the padding can be removed unambiguously upon decrypting
data that was encrypted using PAD_PKCS5 padmode.

Common methods
--------------
encrypt(data, [pad], [padmode])
decrypt(data, [pad], [padmode])
data    -> Bytes to be encrypted/decrypted
pad     -> Optional argument. Only when using padmode of PAD_NORMAL. For
    encryption, adds this characters to the end of the data block when
    data is not a multiple of 8 bytes. For decryption, will remove the
    trailing characters that match this pad character from the last 8
    bytes of the unencrypted data block.
padmode -> Optional argument, set the padding mode, must be one of PAD_NORMAL
    or PAD_PKCS5). Defaults to PAD_NORMAL

Example：

									from pyDes import *

									# For Python3, you'll need to use bytes, i.e.:

									#  data = b"Please encrypt my data"

									#  k = des(b"DESCRYPT", CBC, b"\0\0\0\0\0\0\0\0", pad=None, padmode=PAD_PKCS5)

									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) == dat

以下是本人使用的例子,使用CBC加密的方式：

									import base64

									from pyDes import *

									Des_Key = "BHC#@*UM" # Key

									Des_IV = "\x22\x33\x35\x81\xBC\x38\x5A\xE7" # 自定IV向量

									def DesEncrypt(str):

									  k = des(Des_Key, CBC, Des_IV, pad=None, padmode=PAD_PKCS5)

									  EncryptStr = k.encrypt(str)

									  return base64.b64encode(EncryptStr) #转base64编码返回