pyDes库 实现python的des加密

时间：2024-07-06 13:08:08

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
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