Python基于hashlib模块的文件MD5一致性加密验证示例

#python 检测文件MD5值#python version 2.6import hashlibimport os,sys#简单的测试一个字符串的MD5值def GetStrMd5(src):  m0=hashlib.md5()  m0.update(src)  print m0.hexdigest()  pass#大文件的MD5值def GetFileMd5(filename):  if not os.path.isfile(filename):    return  myhash = hashlib.md5()  f = file(filename,'rb')  while True:    b = f.read(8096)    if not b :      break    myhash.update(b)  f.close()  return myhash.hexdigest()def CalcSha1(filepath):  with open(filepath,'rb') as f:    sha1obj = hashlib.sha1()    sha1obj.update(f.read())    hash = sha1obj.hexdigest()    print(hash)    return hashdef CalcMD5(filepath):  with open(filepath,'rb') as f:    md5obj = hashlib.md5()    md5obj.update(f.read())    hash = md5obj.hexdigest()    print(hash)    return hashif __name__ == "__main__":  if len(sys.argv)==2 :    hashfile = sys.argv[1]    if not os.path.exists(hashfile):      hashfile = os.path.join(os.path.dirname(__file__),hashfile)      if not os.path.exists(hashfile):        print("cannot found file")      else        CalcMD5(hashfile)    else:      CalcMD5(hashfile)      #raw_input("pause")  else:    print("no filename")