#
# Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 The SCons Foundation
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# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
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# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
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__doc__ = """
hashlib backwards-compatibility module for older (pre-2.5) Python versions

This does not not NOT (repeat, *NOT*) provide complete hashlib
functionality.  It only wraps the portions of MD5 functionality used
by SCons, in an interface that looks like hashlib (or enough for our
purposes, anyway).  In fact, this module will raise an ImportError if
the underlying md5 module isn't available.
"""

__revision__ = "src/engine/SCons/compat/_scons_hashlib.py 5357 2011/09/09 21:31:03 bdeegan"

import md5
from string import hexdigits

class md5obj(object):

    md5_module = md5

    def __init__(self, name, string=''):
        if not name in ('MD5', 'md5'):
            raise ValueError("unsupported hash type")
        self.name = 'md5'
        self.m = self.md5_module.md5()

    def __repr__(self):
        return '<%s HASH object @ %#x>' % (self.name, id(self))

    def copy(self):
        import copy
        result = copy.copy(self)
        result.m = self.m.copy()
        return result

    def digest(self):
        return self.m.digest()

    def update(self, arg):
        return self.m.update(arg)

    def hexdigest(self):
        return self.m.hexdigest()

new = md5obj

def md5(string=''):
    return md5obj('md5', string)

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