# /usr/bin/python
# -*- coding:utf-8 -*-
import base64
try:
    import hashlib
    hash = hashlib.md5()
except ImportError:
    # for Python << 2.5
    import md5
    hash = md5.new()
hash.update('spam,spam,and egges')
value = hash.digest()
print repr(value)   #得到的是二进制的字符串
print hash.hexdigest()  #得到的是一个十六进制的值
print base64.encodestring(value) #得到base64的值

# /usr/bin/python
# -*- coding:utf-8 -*-
# 客户端与服务器端通信的信息的验证

import string
import random

def getchallenge():
    challenge = map(lambda i: chr(random.randint(0,255)),range(16))
    return string.join(challenge,"")

def getresponse(password,challenge):
    try:
        import hashlib
        hash = hashlib.md5()
    except ImportError:
        # for Python << 2.5
        import md5
        hash = md5.new()
    hash.update(password)
    hash.update(challenge)
    return  hash.digest()

print "client: ","connect"
challenge= getchallenge()
print "server: ",repr(challenge)
client_response = getresponse("trustno1",challenge)
print "client: ",repr(client_response)
server_response = getresponse("trustno1",challenge)
if client_response == server_response:
    print "server:","login ok"

# /usr/bin/python
# -*- coding:utf-8 -*-

import crypt
import random,string

def getsalt(chars = string.letters+string.digits):
    return random.choice(chars)+random.choice(chars)

salt = getsalt()
print salt
print crypt.crypt('bananas',salt)