Python简单密码加密程序,加盐(salt)md5

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# -------------------------------------------
# Python简单密码加密程序
# 随机生成4位salt，与原始密码组合，通过md5加密
# Author : Lrg
# -------------------------------------------
# encoding = utf-8
from random import Random
from hashlib import md5

# 获取由4位随机大小写字母、数字组成的salt值
def create_salt(length = 4):
    salt = ''
    chars = 'AaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpQqRrSsTtUuVvWwXxYyZz0123456789'
    len_chars = len(chars) - 1
    random = Random()
    for i in xrange(length):
        # 每次从chars中随机取一位
        salt += chars[random.randint(0, len_chars)]
    return salt

# 获取原始密码+salt的md5值
def create_md5(pwd,salt):
    md5_obj = md5()
    md5_obj.update(pwd + salt)
    return md5_obj.hexdigest()

# 原始密码
pwd = '20141124'
# 随机生成4位salt
salt = create_salt()
# 加密后的密码
md5 = create_md5(pwd, salt)

print '[pwd]
',pwd
print '[salt]
', salt
print '[md5]
', md5

效果如下（由于salt每次随机取，MD5当然也不一样）：

[pwd]
20141124
[salt]
Ecm6
[md5]
dbe8860d0e7092e45a60f186e0bd4111