import hashlib

m = hashlib.md5()   #创建hash对象，md5:(message-Digest Algorithm 5)消息摘要算法,得出一个128位的密文

print m             #<md5 HASH object @ 000000000254ADF0>

m.update('BeginMan')#更新哈希对象以字符串参数

print m.digest()    #返回摘要，作为二进制数据字符串值

print m.hexdigest() #返回十六进制数字字符串    0b28251e684dfbd9102f8b6f0281c0c5

print m.digest_size #16

print m.block_size  #64

h = hashlib.new('md5')

print h     #<md5 HASH object @ 000000000260BDB0>

h2 = hashlib.new('ripemd160','what')

print h2    #<ripemd160 HASH object @ 000000000271B9F0>

h.update('beginman')

print h.hexdigest() #666fc5baa93a7fb207c5bfff03b67732

#等效

s = hashlib.md5()

s.update('beginman')

print s.hexdigest() #666fc5baa93a7fb207c5bfff03b67732

print h2.hexdigest()    #9c1185a5c5e9fc54612808977ee8f548b2258d31

#属性

print hashlib.algorithms    #('md5', 'sha1', 'sha224', 'sha256', 'sha384', 'sha512')    列出所有加密算法

print h.digest_size         #16 产生的散列的字节大小。

print h.block_size          #64 The internal block size of the hash algorithm in bytes.

import datetime

KEY_VALUE = '/BeginMan/'

now = datetime.datetime.now()

m = hashlib.md5()

str = '%s%s' %(KEY_VALUE,now.strftime("%Y%m%d"))

m.update(str)

value = m.hexdigest()

print value #8db42d3e90b41105ed061b8347a7c850