"""
The md5 and sha modules are deprecated since Python 2.5, replaced by the
hashlib module containing both hash algorithms. Here, we provide a common
interface to the md5 and sha constructors, depending on system version.
"""

import sys
if sys.version_info >= (2, 5):
    import hashlib
    md5_constructor = hashlib.md5
    md5_hmac = md5_constructor
    sha_constructor = hashlib.sha1
    sha_hmac = sha_constructor
else:
    import md5
    md5_constructor = md5.new
    md5_hmac = md5
    import sha
    sha_constructor = sha.new
    sha_hmac = sha