"""

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, preferring the hashlib module when

available.

"""

try:

    import hashlib

    md5_constructor = hashlib.md5

    md5_hmac = md5_constructor

    sha_constructor = hashlib.sha1

    sha_hmac = sha_constructor

except ImportError:

    import md5

    md5_constructor = md5.new

    md5_hmac = md5

    import sha

    sha_constructor = sha.new

    sha_hmac = sha