1 """

     2 The md5 and sha modules are deprecated since Python 2.5, replaced by the

     3 hashlib module containing both hash algorithms. Here, we provide a common

     4 interface to the md5 and sha constructors, preferring the hashlib module when

     5 available.

     6 """

     7 

     8 try:

     9     import hashlib

    10     md5_constructor = hashlib.md5

    11     md5_hmac = md5_constructor

    12     sha_constructor = hashlib.sha1

    13     sha_hmac = sha_constructor

    14 except ImportError:

    15     import md5

    16     md5_constructor = md5.new

    17     md5_hmac = md5

    18     import sha

    19     sha_constructor = sha.new

    20     sha_hmac = sha