MD5加解密

#-*- coding:utf-8 -*-

import hashlib
import os

filenname = 'd:\\temp\\uat_1_71_2016_09_28.sql'
def md5hex(word):
""" MD5加密算法，返回32位小写16进制符号
"""
if isinstance(word, unicode):
word = word.encode("utf-8")
elif not isinstance(word, str):
word = str(word)
m = hashlib.md5()
m.update(word)
return m.hexdigest()

def md5sum(fname):
""" 计算文件的MD5值
"""
def read_chunks(fh):
fh.seek(0)
chunk = fh.read(8096)
while chunk:
yield chunk
chunk = fh.read(8096)
else: #最后要将游标放回文件开头
fh.seek(0)
m = hashlib.md5()
if isinstance(fname, basestring) \
and os.path.exists(fname):
with open(fname, "rb") as fh:
for chunk in read_chunks(fh):
m.update(chunk)
#上传的文件缓存 或 已打开的文件流
elif fname.__class__.__name__ in ["StringIO", "StringO"] \
or isinstance(fname, file):
for chunk in read_chunks(fname):
m.update(chunk)
else:
return ""
return m.hexdigest()

fmd5 = md5sum(filenname)
print fmd5