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From wohali <...@git.apache.org>
Subject [GitHub] couchdb pull request: fixes COUCHDB-2362 admin auth in dev cluster
Date Sat, 25 Oct 2014 23:08:52 GMT
Github user wohali commented on a diff in the pull request:

    https://github.com/apache/couchdb/pull/269#discussion_r19378073
  
    --- Diff: dev/pbkdf2.py ---
    @@ -0,0 +1,130 @@
    +# -*- coding: utf-8 -*-
    +"""
    +    pbkdf2
    +    ~~~~~~
    +
    +    This module implements pbkdf2 for Python.  It also has some basic
    +    tests that ensure that it works.  The implementation is straightforward
    +    and uses stdlib only stuff and can be easily be copy/pasted into
    +    your favourite application.
    +
    +    Use this as replacement for bcrypt that does not need a c implementation
    +    of a modified blowfish crypto algo.
    +
    +    Example usage:
    +
    +    >>> pbkdf2_hex('what i want to hash', 'the random salt')
    +    'fa7cc8a2b0a932f8e6ea42f9787e9d36e592e0c222ada6a9'
    +
    +    How to use this:
    +
    +    1.  Use a constant time string compare function to compare the stored hash
    +        with the one you're generating::
    +
    +            def safe_str_cmp(a, b):
    +                if len(a) != len(b):
    +                    return False
    +                rv = 0
    +                for x, y in izip(a, b):
    +                    rv |= ord(x) ^ ord(y)
    +                return rv == 0
    +
    +    2.  Use `os.urandom` to generate a proper salt of at least 8 byte.
    +        Use a unique salt per hashed password.
    +
    +    3.  Store ``algorithm$salt:costfactor$hash`` in the database so that
    +        you can upgrade later easily to a different algorithm if you need
    +        one.  For instance ``PBKDF2-256$thesalt:10000$deadbeef...``.
    +
    +
    +    :copyright: (c) Copyright 2011 by Armin Ronacher.
    +    :license: BSD, see LICENSE for more details.
    +"""
    +import hmac
    +import hashlib
    +from struct import Struct
    +from operator import xor
    +from itertools import izip, starmap
    +
    +
    +_pack_int = Struct('>I').pack
    +
    +
    +def pbkdf2_hex(data, salt, iterations=1000, keylen=24, hashfunc=None):
    +    """Like :func:`pbkdf2_bin` but returns a hex encoded string."""
    +    return pbkdf2_bin(data, salt, iterations, keylen, hashfunc).encode('hex')
    +
    +
    +def pbkdf2_bin(data, salt, iterations=1000, keylen=24, hashfunc=None):
    +    """Returns a binary digest for the PBKDF2 hash algorithm of `data`
    +    with the given `salt`.  It iterates `iterations` time and produces a
    +    key of `keylen` bytes.  By default SHA-1 is used as hash function,
    +    a different hashlib `hashfunc` can be provided.
    +    """
    +    hashfunc = hashfunc or hashlib.sha1
    +    mac = hmac.new(data, None, hashfunc)
    +    def _pseudorandom(x, mac=mac):
    +        h = mac.copy()
    +        h.update(x)
    +        return map(ord, h.digest())
    +    buf = []
    +    for block in xrange(1, -(-keylen // mac.digest_size) + 1):
    +        rv = u = _pseudorandom(salt + _pack_int(block))
    +        for i in xrange(iterations - 1):
    +            u = _pseudorandom(''.join(map(chr, u)))
    +            rv = starmap(xor, izip(rv, u))
    +        buf.extend(rv)
    +    return ''.join(map(chr, buf))[:keylen]
    +
    +
    +def test():
    +    failed = []
    +    def check(data, salt, iterations, keylen, expected):
    +        rv = pbkdf2_hex(data, salt, iterations, keylen)
    +        if rv != expected:
    +            print 'Test failed:'
    +            print '  Expected:   %s' % expected
    +            print '  Got:        %s' % rv
    +            print '  Parameters:'
    +            print '    data=%s' % data
    +            print '    salt=%s' % salt
    +            print '    iterations=%d' % iterations
    +            print
    +            failed.append(1)
    +
    +    # From RFC 6070
    +    check('password', 'salt', 1, 20,
    +          '0c60c80f961f0e71f3a9b524af6012062fe037a6')
    +    check('password', 'salt', 2, 20,
    +          'ea6c014dc72d6f8ccd1ed92ace1d41f0d8de8957')
    +    check('password', 'salt', 4096, 20,
    +          '4b007901b765489abead49d926f721d065a429c1')
    +    check('passwordPASSWORDpassword', 'saltSALTsaltSALTsaltSALTsaltSALTsalt',
    +          4096, 25, '3d2eec4fe41c849b80c8d83662c0e44a8b291a964cf2f07038')
    +    check('pass\x00word', 'sa\x00lt', 4096, 16,
    +          '56fa6aa75548099dcc37d7f03425e0c3')
    +    # This one is from the RFC but it just takes for ages
    +    ##check('password', 'salt', 16777216, 20,
    +    ##      'eefe3d61cd4da4e4e9945b3d6ba2158c2634e984')
    +
    +    # From Crypt-PBKDF2
    +    check('password', 'ATHENA.MIT.EDUraeburn', 1, 16,
    +          'cdedb5281bb2f801565a1122b2563515')
    +    check('password', 'ATHENA.MIT.EDUraeburn', 1, 32,
    +          'cdedb5281bb2f801565a1122b25635150ad1f7a04bb9f3a333ecc0e2e1f70837')
    +    check('password', 'ATHENA.MIT.EDUraeburn', 2, 16,
    +          '01dbee7f4a9e243e988b62c73cda935d')
    +    check('password', 'ATHENA.MIT.EDUraeburn', 2, 32,
    +          '01dbee7f4a9e243e988b62c73cda935da05378b93244ec8f48a99e61ad799d86')
    +    check('password', 'ATHENA.MIT.EDUraeburn', 1200, 32,
    +          '5c08eb61fdf71e4e4ec3cf6ba1f5512ba7e52ddbc5e5142f708a31e2e62b1e13')
    +    check('X' * 64, 'pass phrase equals block size', 1200, 32,
    +          '139c30c0966bc32ba55fdbf212530ac9c5ec59f1a452f5cc9ad940fea0598ed1')
    +    check('X' * 65, 'pass phrase exceeds block size', 1200, 32,
    +          '9ccad6d468770cd51b10e6a68721be611a8b4d282601db3b36be9246915ec82a')
    +
    +    raise SystemExit(bool(failed))
    +
    +
    +if __name__ == '__main__':
    +    test()
    --- End diff --
    
    newline at end of file please


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