des结合base64加解密的python源码

#coding=utf8
from pyDes import *
import base64


class Crypt_Error():
    pass

"""
des方法,des(处理后的秘钥,加密方式，位移向量，位移方式，填充方式)
"""


def _get_key(key):
    if not key:
        key="U8y0R81k"
    elif len(key)>8:
        key=key[0:8]
    elif len(key)<8:
        raise Crypt_Error('秘钥长度不足八位，请检查秘钥')
    return key


def encrypt_data(data,key):
    """
    加密
    :return:
    """
    k = des(_get_key(key), ECB, "\0\0\0\0\0\0\0\0", pad=None, padmode=PAD_PKCS5)
    d = base64.encodestring(k.encrypt(data))
    return ''.join(d.split('\n')[:-1])


def decrypt_data(data,key):
    """
    解密
    :param data:
    :return:
    """
    data = base64.decodestring(data)
    k = des(_get_key(key), ECB, "\0\0\0\0\0\0\0\0", pad=None, padmode=PAD_PKCS5)
    return k.decrypt(data, pad=None, padmode=PAD_PKCS5)


# if __name__=='__main__':
#     data = "123456"
#     key= "e10adc3949ba59abbe56e057f20f88dd"
#     b=encrypt_data(data,key)
#
#     print b
#     print decrypt_data(b,key)