# Test hashlib module
#
# $Id$
#
#  Copyright (C) 2005-2010   Gregory P. Smith (greg@krypto.org)
#  Licensed to PSF under a Contributor Agreement.
#

import array
from binascii import unhexlify
import functools
import hashlib
import importlib
import itertools
import os
import sys
import threading
import unittest
import warnings
from test import support
from test.support import _4G, bigmemtest, import_fresh_module
from test.support import requires_hashdigest
from http.client import HTTPException

# Were we compiled --with-pydebug or with #define Py_DEBUG?
COMPILED_WITH_PYDEBUG = hasattr(sys, 'gettotalrefcount')

c_hashlib = import_fresh_module('hashlib', fresh=['_hashlib'])
py_hashlib = import_fresh_module('hashlib', blocked=['_hashlib'])

try:
    from _hashlib import HASH
except ImportError:
    HASH = None

try:
    import _blake2
except ImportError:
    _blake2 = None

requires_blake2 = unittest.skipUnless(_blake2, 'requires _blake2')

try:
    import _sha3
except ImportError:
    _sha3 = None

requires_sha3 = unittest.skipUnless(_sha3, 'requires _sha3')


def hexstr(s):
    assert isinstance(s, bytes), repr(s)
    h = "0123456789abcdef"
    r = ''
    for i in s:
        r += h[(i >> 4) & 0xF] + h[i & 0xF]
    return r


URL = "http://www.pythontest.net/hashlib/{}.txt"

def read_vectors(hash_name):
    url = URL.format(hash_name)
    try:
        testdata = support.open_urlresource(url)
    except (OSError, HTTPException):
        raise unittest.SkipTest("Could not retrieve {}".format(url))
    with testdata:
        for line in testdata:
            line = line.strip()
            if line.startswith('#') or not line:
                continue
            parts = line.split(',')
            parts[0] = bytes.fromhex(parts[0])
            yield parts


class HashLibTestCase(unittest.TestCase):
    supported_hash_names = ( 'md5', 'MD5', 'sha1', 'SHA1',
                             'sha224', 'SHA224', 'sha256', 'SHA256',
                             'sha384', 'SHA384', 'sha512', 'SHA512',
                             'blake2b', 'blake2s',
                             'sha3_224', 'sha3_256', 'sha3_384', 'sha3_512',
                             'shake_128', 'shake_256')

    shakes = {'shake_128', 'shake_256'}

    # Issue #14693: fallback modules are always compiled under POSIX
    _warn_on_extension_import = os.name == 'posix' or COMPILED_WITH_PYDEBUG

    def _conditional_import_module(self, module_name):
        """Import a module and return a reference to it or None on failure."""
        try:
            return importlib.import_module(module_name)
        except ModuleNotFoundError as error:
            if self._warn_on_extension_import:
                warnings.warn('Did a C extension fail to compile? %s' % error)
        return None

    def __init__(self, *args, **kwargs):
        algorithms = set()
        for algorithm in self.supported_hash_names:
            algorithms.add(algorithm.lower())

        _blake2 = self._conditional_import_module('_blake2')
        if _blake2:
            algorithms.update({'blake2b', 'blake2s'})

        self.constructors_to_test = {}
        for algorithm in algorithms:
            self.constructors_to_test[algorithm] = set()

        # For each algorithm, test the direct constructor and the use
        # of hashlib.new given the algorithm name.
        for algorithm, constructors in self.constructors_to_test.items():
            constructors.add(getattr(hashlib, algorithm))
            def _test_algorithm_via_hashlib_new(data=None, _alg=algorithm, **kwargs):
                if data is None:
                    return hashlib.new(_alg, **kwargs)
                return hashlib.new(_alg, data, **kwargs)
            constructors.add(_test_algorithm_via_hashlib_new)

        _hashlib = self._conditional_import_module('_hashlib')
        self._hashlib = _hashlib
        if _hashlib:
            # These two algorithms should always be present when this module
            # is compiled.  If not, something was compiled wrong.
            self.assertTrue(hasattr(_hashlib, 'openssl_md5'))
            self.assertTrue(hasattr(_hashlib, 'openssl_sha1'))
            for algorithm, constructors in self.constructors_to_test.items():
                constructor = getattr(_hashlib, 'openssl_'+algorithm, None)
                if constructor:
                    try:
                        constructor()
                    except ValueError:
                        # default constructor blocked by crypto policy
                        pass
                    else:
                        constructors.add(constructor)

        def add_builtin_constructor(name):
            constructor = getattr(hashlib, "__get_builtin_constructor")(name)
            self.constructors_to_test[name].add(constructor)

        _md5 = self._conditional_import_module('_md5')
        if _md5:
            add_builtin_constructor('md5')
        _sha1 = self._conditional_import_module('_sha1')
        if _sha1:
            add_builtin_constructor('sha1')
        _sha256 = self._conditional_import_module('_sha256')
        if _sha256:
            add_builtin_constructor('sha224')
            add_builtin_constructor('sha256')
        _sha512 = self._conditional_import_module('_sha512')
        if _sha512:
            add_builtin_constructor('sha384')
            add_builtin_constructor('sha512')
        if _blake2:
            add_builtin_constructor('blake2s')
            add_builtin_constructor('blake2b')

        _sha3 = self._conditional_import_module('_sha3')
        if _sha3:
            add_builtin_constructor('sha3_224')
            add_builtin_constructor('sha3_256')
            add_builtin_constructor('sha3_384')
            add_builtin_constructor('sha3_512')
            add_builtin_constructor('shake_128')
            add_builtin_constructor('shake_256')

        super(HashLibTestCase, self).__init__(*args, **kwargs)

    @property
    def hash_constructors(self):
        constructors = self.constructors_to_test.values()
        return itertools.chain.from_iterable(constructors)

    @support.refcount_test
    @unittest.skipIf(c_hashlib is None, 'Require _hashlib module')
    def test_refleaks_in_hash___init__(self):
        gettotalrefcount = support.get_attribute(sys, 'gettotalrefcount')
        sha1_hash = c_hashlib.new('sha1')
        refs_before = gettotalrefcount()
        for i in range(100):
            sha1_hash.__init__('sha1')
        self.assertAlmostEqual(gettotalrefcount() - refs_before, 0, delta=10)

    def test_hash_array(self):
        a = array.array("b", range(10))
        for cons in self.hash_constructors:
            c = cons(a)
            if c.name in self.shakes:
                c.hexdigest(16)
            else:
                c.hexdigest()

    def test_algorithms_guaranteed(self):
        self.assertEqual(hashlib.algorithms_guaranteed,
            set(_algo for _algo in self.supported_hash_names
                  if _algo.islower()))

    def test_algorithms_available(self):
        self.assertTrue(set(hashlib.algorithms_guaranteed).
                            issubset(hashlib.algorithms_available))

    def test_unknown_hash(self):
        self.assertRaises(ValueError, hashlib.new, 'spam spam spam spam spam')
        self.assertRaises(TypeError, hashlib.new, 1)

    def test_new_upper_to_lower(self):
        self.assertEqual(hashlib.new("SHA256").name, "sha256")

    def test_get_builtin_constructor(self):
        get_builtin_constructor = getattr(hashlib,
                                          '__get_builtin_constructor')
        builtin_constructor_cache = getattr(hashlib,
                                            '__builtin_constructor_cache')
        self.assertRaises(ValueError, get_builtin_constructor, 'test')
        try:
            import _md5
        except ImportError:
            self.skipTest("_md5 module not available")
        # This forces an ImportError for "import _md5" statements
        sys.modules['_md5'] = None
        # clear the cache
        builtin_constructor_cache.clear()
        try:
            self.assertRaises(ValueError, get_builtin_constructor, 'md5')
        finally:
            if '_md5' in locals():
                sys.modules['_md5'] = _md5
            else:
                del sys.modules['_md5']
        self.assertRaises(TypeError, get_builtin_constructor, 3)
        constructor = get_builtin_constructor('md5')
        self.assertIs(constructor, _md5.md5)
        self.assertEqual(sorted(builtin_constructor_cache), ['MD5', 'md5'])

    def test_hexdigest(self):
        for cons in self.hash_constructors:
            h = cons()
            if h.name in self.shakes:
                self.assertIsInstance(h.digest(16), bytes)
                self.assertEqual(hexstr(h.digest(16)), h.hexdigest(16))
            else:
                self.assertIsInstance(h.digest(), bytes)
                self.assertEqual(hexstr(h.digest()), h.hexdigest())

    def test_digest_length_overflow(self):
        # See issue #34922
        large_sizes = (2**29, 2**32-10, 2**32+10, 2**61, 2**64-10, 2**64+10)
        for cons in self.hash_constructors:
            h = cons()
            if h.name not in self.shakes:
                continue
            for digest in h.digest, h.hexdigest:
                self.assertRaises(ValueError, digest, -10)
                for length in large_sizes:
                    with self.assertRaises((ValueError, OverflowError)):
                        digest(length)

    def test_name_attribute(self):
        for cons in self.hash_constructors:
            h = cons()
            self.assertIsInstance(h.name, str)
            if h.name in self.supported_hash_names:
                self.assertIn(h.name, self.supported_hash_names)
            else:
                self.assertNotIn(h.name, self.supported_hash_names)
            self.assertEqual(h.name, hashlib.new(h.name).name)

    def test_large_update(self):
        aas = b'a' * 128
        bees = b'b' * 127
        cees = b'c' * 126
        dees = b'd' * 2048 #  HASHLIB_GIL_MINSIZE

        for cons in self.hash_constructors:
            m1 = cons()
            m1.update(aas)
            m1.update(bees)
            m1.update(cees)
            m1.update(dees)
            if m1.name in self.shakes:
                args = (16,)
            else:
                args = ()

            m2 = cons()
            m2.update(aas + bees + cees + dees)
            self.assertEqual(m1.digest(*args), m2.digest(*args))

            m3 = cons(aas + bees + cees + dees)
            self.assertEqual(m1.digest(*args), m3.digest(*args))

            # verify copy() doesn't touch original
            m4 = cons(aas + bees + cees)
            m4_digest = m4.digest(*args)
            m4_copy = m4.copy()
            m4_copy.update(dees)
            self.assertEqual(m1.digest(*args), m4_copy.digest(*args))
            self.assertEqual(m4.digest(*args), m4_digest)

    def check(self, name, data, hexdigest, shake=False, **kwargs):
        length = len(hexdigest)//2
        hexdigest = hexdigest.lower()
        constructors = self.constructors_to_test[name]
        # 2 is for hashlib.name(...) and hashlib.new(name, ...)
        self.assertGreaterEqual(len(constructors), 2)
        for hash_object_constructor in constructors:
            m = hash_object_constructor(data, **kwargs)
            computed = m.hexdigest() if not shake else m.hexdigest(length)
            self.assertEqual(
                    computed, hexdigest,
                    "Hash algorithm %s constructed using %s returned hexdigest"
                    " %r for %d byte input data that should have hashed to %r."
                    % (name, hash_object_constructor,
                       computed, len(data), hexdigest))
            computed = m.digest() if not shake else m.digest(length)
            digest = bytes.fromhex(hexdigest)
            self.assertEqual(computed, digest)
            if not shake:
                self.assertEqual(len(digest), m.digest_size)

    def check_no_unicode(self, algorithm_name):
        # Unicode objects are not allowed as input.
        constructors = self.constructors_to_test[algorithm_name]
        for hash_object_constructor in constructors:
            self.assertRaises(TypeError, hash_object_constructor, 'spam')

    def test_no_unicode(self):
        self.check_no_unicode('md5')
        self.check_no_unicode('sha1')
        self.check_no_unicode('sha224')
        self.check_no_unicode('sha256')
        self.check_no_unicode('sha384')
        self.check_no_unicode('sha512')

    @requires_blake2
    def test_no_unicode_blake2(self):
        self.check_no_unicode('blake2b')
        self.check_no_unicode('blake2s')

    @requires_sha3
    def test_no_unicode_sha3(self):
        self.check_no_unicode('sha3_224')
        self.check_no_unicode('sha3_256')
        self.check_no_unicode('sha3_384')
        self.check_no_unicode('sha3_512')
        self.check_no_unicode('shake_128')
        self.check_no_unicode('shake_256')

    def check_blocksize_name(self, name, block_size=0, digest_size=0,
                             digest_length=None):
        constructors = self.constructors_to_test[name]
        for hash_object_constructor in constructors:
            m = hash_object_constructor()
            self.assertEqual(m.block_size, block_size)
            self.assertEqual(m.digest_size, digest_size)
            if digest_length:
                self.assertEqual(len(m.digest(digest_length)),
                                 digest_length)
                self.assertEqual(len(m.hexdigest(digest_length)),
                                 2*digest_length)
            else:
                self.assertEqual(len(m.digest()), digest_size)
                self.assertEqual(len(m.hexdigest()), 2*digest_size)
            self.assertEqual(m.name, name)
            # split for sha3_512 / _sha3.sha3 object
            self.assertIn(name.split("_")[0], repr(m))

    def test_blocksize_name(self):
        self.check_blocksize_name('md5', 64, 16)
        self.check_blocksize_name('sha1', 64, 20)
        self.check_blocksize_name('sha224', 64, 28)
        self.check_blocksize_name('sha256', 64, 32)
        self.check_blocksize_name('sha384', 128, 48)
        self.check_blocksize_name('sha512', 128, 64)

    @requires_sha3
    def test_blocksize_name_sha3(self):
        self.check_blocksize_name('sha3_224', 144, 28)
        self.check_blocksize_name('sha3_256', 136, 32)
        self.check_blocksize_name('sha3_384', 104, 48)
        self.check_blocksize_name('sha3_512', 72, 64)
        self.check_blocksize_name('shake_128', 168, 0, 32)
        self.check_blocksize_name('shake_256', 136, 0, 64)

    def check_sha3(self, name, capacity, rate, suffix):
        constructors = self.constructors_to_test[name]
        for hash_object_constructor in constructors:
            m = hash_object_constructor()
            if HASH is not None and isinstance(m, HASH):
                # _hashopenssl's variant does not have extra SHA3 attributes
                continue
            self.assertEqual(capacity + rate, 1600)
            self.assertEqual(m._capacity_bits, capacity)
            self.assertEqual(m._rate_bits, rate)
            self.assertEqual(m._suffix, suffix)

    @requires_sha3
    def test_extra_sha3(self):
        self.check_sha3('sha3_224', 448, 1152, b'\x06')
        self.check_sha3('sha3_256', 512, 1088, b'\x06')
        self.check_sha3('sha3_384', 768, 832, b'\x06')
        self.check_sha3('sha3_512', 1024, 576, b'\x06')
        self.check_sha3('shake_128', 256, 1344, b'\x1f')
        self.check_sha3('shake_256', 512, 1088, b'\x1f')

    @requires_blake2
    def test_blocksize_name_blake2(self):
        self.check_blocksize_name('blake2b', 128, 64)
        self.check_blocksize_name('blake2s', 64, 32)

    def test_case_md5_0(self):
        self.check('md5', b'', 'd41d8cd98f00b204e9800998ecf8427e')

    def test_case_md5_1(self):
        self.check('md5', b'abc', '900150983cd24fb0d6963f7d28e17f72')

    def test_case_md5_2(self):
        self.check('md5',
                   b'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789',
                   'd174ab98d277d9f5a5611c2c9f419d9f')

    @unittest.skipIf(sys.maxsize < _4G + 5, 'test cannot run on 32-bit systems')
    @bigmemtest(size=_4G + 5, memuse=1, dry_run=False)
    def test_case_md5_huge(self, size):
        self.check('md5', b'A'*size, 'c9af2dff37468ce5dfee8f2cfc0a9c6d')

    @unittest.skipIf(sys.maxsize < _4G - 1, 'test cannot run on 32-bit systems')
    @bigmemtest(size=_4G - 1, memuse=1, dry_run=False)
    def test_case_md5_uintmax(self, size):
        self.check('md5', b'A'*size, '28138d306ff1b8281f1a9067e1a1a2b3')

    @unittest.skipIf(sys.maxsize < _4G - 1, 'test cannot run on 32-bit systems')
    @bigmemtest(size=_4G - 1, memuse=1, dry_run=False)
    def test_sha3_update_overflow(self, size):
        """Regression test for gh-98517 CVE-2022-37454."""
        h = hashlib.sha3_224()
        h.update(b'\x01')
        h.update(b'\x01'*0xffff_ffff)
        self.assertEqual(h.hexdigest(), '80762e8ce6700f114fec0f621fd97c4b9c00147fa052215294cceeed')

    # use the three examples from Federal Information Processing Standards
    # Publication 180-1, Secure Hash Standard,  1995 April 17
    # http://www.itl.nist.gov/div897/pubs/fip180-1.htm

    def test_case_sha1_0(self):
        self.check('sha1', b"",
                   "da39a3ee5e6b4b0d3255bfef95601890afd80709")

    def test_case_sha1_1(self):
        self.check('sha1', b"abc",
                   "a9993e364706816aba3e25717850c26c9cd0d89d")

    def test_case_sha1_2(self):
        self.check('sha1',
                   b"abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq",
                   "84983e441c3bd26ebaae4aa1f95129e5e54670f1")

    def test_case_sha1_3(self):
        self.check('sha1', b"a" * 1000000,
                   "34aa973cd4c4daa4f61eeb2bdbad27316534016f")


    # use the examples from Federal Information Processing Standards
    # Publication 180-2, Secure Hash Standard,  2002 August 1
    # http://csrc.nist.gov/publications/fips/fips180-2/fips180-2.pdf

    def test_case_sha224_0(self):
        self.check('sha224', b"",
          "d14a028c2a3a2bc9476102bb288234c415a2b01f828ea62ac5b3e42f")

    def test_case_sha224_1(self):
        self.check('sha224', b"abc",
          "23097d223405d8228642a477bda255b32aadbce4bda0b3f7e36c9da7")

    def test_case_sha224_2(self):
        self.check('sha224',
          b"abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq",
          "75388b16512776cc5dba5da1fd890150b0c6455cb4f58b1952522525")

    def test_case_sha224_3(self):
        self.check('sha224', b"a" * 1000000,
          "20794655980c91d8bbb4c1ea97618a4bf03f42581948b2ee4ee7ad67")


    def test_case_sha256_0(self):
        self.check('sha256', b"",
          "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855")

    def test_case_sha256_1(self):
        self.check('sha256', b"abc",
          "ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad")

    def test_case_sha256_2(self):
        self.check('sha256',
          b"abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq",
          "248d6a61d20638b8e5c026930c3e6039a33ce45964ff2167f6ecedd419db06c1")

    def test_case_sha256_3(self):
        self.check('sha256', b"a" * 1000000,
          "cdc76e5c9914fb9281a1c7e284d73e67f1809a48a497200e046d39ccc7112cd0")


    def test_case_sha384_0(self):
        self.check('sha384', b"",
          "38b060a751ac96384cd9327eb1b1e36a21fdb71114be07434c0cc7bf63f6e1da"+
          "274edebfe76f65fbd51ad2f14898b95b")

    def test_case_sha384_1(self):
        self.check('sha384', b"abc",
          "cb00753f45a35e8bb5a03d699ac65007272c32ab0eded1631a8b605a43ff5bed"+
          "8086072ba1e7cc2358baeca134c825a7")

    def test_case_sha384_2(self):
        self.check('sha384',
                   b"abcdefghbcdefghicdefghijdefghijkefghijklfghijklmghijklmn"+
                   b"hijklmnoijklmnopjklmnopqklmnopqrlmnopqrsmnopqrstnopqrstu",
          "09330c33f71147e83d192fc782cd1b4753111b173b3b05d22fa08086e3b0f712"+
          "fcc7c71a557e2db966c3e9fa91746039")

    def test_case_sha384_3(self):
        self.check('sha384', b"a" * 1000000,
          "9d0e1809716474cb086e834e310a4a1ced149e9c00f248527972cec5704c2a5b"+
          "07b8b3dc38ecc4ebae97ddd87f3d8985")


    def test_case_sha512_0(self):
        self.check('sha512', b"",
          "cf83e1357eefb8bdf1542850d66d8007d620e4050b5715dc83f4a921d36ce9ce"+
          "47d0d13c5d85f2b0ff8318d2877eec2f63b931bd47417a81a538327af927da3e")

    def test_case_sha512_1(self):
        self.check('sha512', b"abc",
          "ddaf35a193617abacc417349ae20413112e6fa4e89a97ea20a9eeee64b55d39a"+
          "2192992a274fc1a836ba3c23a3feebbd454d4423643ce80e2a9ac94fa54ca49f")

    def test_case_sha512_2(self):
        self.check('sha512',
                   b"abcdefghbcdefghicdefghijdefghijkefghijklfghijklmghijklmn"+
                   b"hijklmnoijklmnopjklmnopqklmnopqrlmnopqrsmnopqrstnopqrstu",
          "8e959b75dae313da8cf4f72814fc143f8f7779c6eb9f7fa17299aeadb6889018"+
          "501d289e4900f7e4331b99dec4b5433ac7d329eeb6dd26545e96e55b874be909")

    def test_case_sha512_3(self):
        self.check('sha512', b"a" * 1000000,
          "e718483d0ce769644e2e42c7bc15b4638e1f98b13b2044285632a803afa973eb"+
          "de0ff244877ea60a4cb0432ce577c31beb009c5c2c49aa2e4eadb217ad8cc09b")

    def check_blake2(self, constructor, salt_size, person_size, key_size,
                     digest_size, max_offset):
        self.assertEqual(constructor.SALT_SIZE, salt_size)
        for i in range(salt_size + 1):
            constructor(salt=b'a' * i)
        salt = b'a' * (salt_size + 1)
        self.assertRaises(ValueError, constructor, salt=salt)

        self.assertEqual(constructor.PERSON_SIZE, person_size)
        for i in range(person_size+1):
            constructor(person=b'a' * i)
        person = b'a' * (person_size + 1)
        self.assertRaises(ValueError, constructor, person=person)

        self.assertEqual(constructor.MAX_DIGEST_SIZE, digest_size)
        for i in range(1, digest_size + 1):
            constructor(digest_size=i)
        self.assertRaises(ValueError, constructor, digest_size=-1)
        self.assertRaises(ValueError, constructor, digest_size=0)
        self.assertRaises(ValueError, constructor, digest_size=digest_size+1)

        self.assertEqual(constructor.MAX_KEY_SIZE, key_size)
        for i in range(key_size+1):
            constructor(key=b'a' * i)
        key = b'a' * (key_size + 1)
        self.assertRaises(ValueError, constructor, key=key)
        self.assertEqual(constructor().hexdigest(),
                         constructor(key=b'').hexdigest())

        for i in range(0, 256):
            constructor(fanout=i)
        self.assertRaises(ValueError, constructor, fanout=-1)
        self.assertRaises(ValueError, constructor, fanout=256)

        for i in range(1, 256):
            constructor(depth=i)
        self.assertRaises(ValueError, constructor, depth=-1)
        self.assertRaises(ValueError, constructor, depth=0)
        self.assertRaises(ValueError, constructor, depth=256)

        for i in range(0, 256):
            constructor(node_depth=i)
        self.assertRaises(ValueError, constructor, node_depth=-1)
        self.assertRaises(ValueError, constructor, node_depth=256)

        for i in range(0, digest_size + 1):
            constructor(inner_size=i)
        self.assertRaises(ValueError, constructor, inner_size=-1)
        self.assertRaises(ValueError, constructor, inner_size=digest_size+1)

        constructor(leaf_size=0)
        constructor(leaf_size=(1<<32)-1)
        self.assertRaises(ValueError, constructor, leaf_size=-1)
        self.assertRaises(OverflowError, constructor, leaf_size=1<<32)

        constructor(node_offset=0)
        constructor(node_offset=max_offset)
        self.assertRaises(ValueError, constructor, node_offset=-1)
        self.assertRaises(OverflowError, constructor, node_offset=max_offset+1)

        self.assertRaises(TypeError, constructor, data=b'')
        self.assertRaises(TypeError, constructor, string=b'')
        self.assertRaises(TypeError, constructor, '')

        constructor(
            b'',
            key=b'',
            salt=b'',
            person=b'',
            digest_size=17,
            fanout=1,
            depth=1,
            leaf_size=256,
            node_offset=512,
            node_depth=1,
            inner_size=7,
            last_node=True
        )

    def blake2_rfc7693(self, constructor, md_len, in_len):
        def selftest_seq(length, seed):
            mask = (1<<32)-1
            a = (0xDEAD4BAD * seed) & mask
            b = 1
            out = bytearray(length)
            for i in range(length):
                t = (a + b) & mask
                a, b = b, t
                out[i] = (t >> 24) & 0xFF
            return out
        outer = constructor(digest_size=32)
        for outlen in md_len:
            for inlen in in_len:
                indata = selftest_seq(inlen, inlen)
                key = selftest_seq(outlen, outlen)
                unkeyed = constructor(indata, digest_size=outlen)
                outer.update(unkeyed.digest())
                keyed = constructor(indata, key=key, digest_size=outlen)
                outer.update(keyed.digest())
        return outer.hexdigest()

    @requires_blake2
    def test_blake2b(self):
        self.check_blake2(hashlib.blake2b, 16, 16, 64, 64, (1<<64)-1)
        b2b_md_len = [20, 32, 48, 64]
        b2b_in_len = [0, 3, 128, 129, 255, 1024]
        self.assertEqual(
            self.blake2_rfc7693(hashlib.blake2b, b2b_md_len, b2b_in_len),
            "c23a7800d98123bd10f506c61e29da5603d763b8bbad2e737f5e765a7bccd475")

    @requires_blake2
    def test_case_blake2b_0(self):
        self.check('blake2b', b"",
          "786a02f742015903c6c6fd852552d272912f4740e15847618a86e217f71f5419"+
          "d25e1031afee585313896444934eb04b903a685b1448b755d56f701afe9be2ce")

    @requires_blake2
    def test_case_blake2b_1(self):
        self.check('blake2b', b"abc",
          "ba80a53f981c4d0d6a2797b69f12f6e94c212f14685ac4b74b12bb6fdbffa2d1"+
          "7d87c5392aab792dc252d5de4533cc9518d38aa8dbf1925ab92386edd4009923")

    @requires_blake2
    def test_case_blake2b_all_parameters(self):
        # This checks that all the parameters work in general, and also that
        # parameter byte order doesn't get confused on big endian platforms.
        self.check('blake2b', b"foo",
          "920568b0c5873b2f0ab67bedb6cf1b2b",
          digest_size=16,
          key=b"bar",
          salt=b"baz",
          person=b"bing",
          fanout=2,
          depth=3,
          leaf_size=4,
          node_offset=5,
          node_depth=6,
          inner_size=7,
          last_node=True)

    @requires_blake2
    def test_blake2b_vectors(self):
        for msg, key, md in read_vectors('blake2b'):
            key = bytes.fromhex(key)
            self.check('blake2b', msg, md, key=key)

    @requires_blake2
    def test_blake2s(self):
        self.check_blake2(hashlib.blake2s, 8, 8, 32, 32, (1<<48)-1)
        b2s_md_len = [16, 20, 28, 32]
        b2s_in_len = [0, 3, 64, 65, 255, 1024]
        self.assertEqual(
            self.blake2_rfc7693(hashlib.blake2s, b2s_md_len, b2s_in_len),
            "6a411f08ce25adcdfb02aba641451cec53c598b24f4fc787fbdc88797f4c1dfe")

    @requires_blake2
    def test_case_blake2s_0(self):
        self.check('blake2s', b"",
          "69217a3079908094e11121d042354a7c1f55b6482ca1a51e1b250dfd1ed0eef9")

    @requires_blake2
    def test_case_blake2s_1(self):
        self.check('blake2s', b"abc",
          "508c5e8c327c14e2e1a72ba34eeb452f37458b209ed63a294d999b4c86675982")

    @requires_blake2
    def test_case_blake2s_all_parameters(self):
        # This checks that all the parameters work in general, and also that
        # parameter byte order doesn't get confused on big endian platforms.
        self.check('blake2s', b"foo",
          "bf2a8f7fe3c555012a6f8046e646bc75",
          digest_size=16,
          key=b"bar",
          salt=b"baz",
          person=b"bing",
          fanout=2,
          depth=3,
          leaf_size=4,
          node_offset=5,
          node_depth=6,
          inner_size=7,
          last_node=True)

    @requires_blake2
    def test_blake2s_vectors(self):
        for msg, key, md in read_vectors('blake2s'):
            key = bytes.fromhex(key)
            self.check('blake2s', msg, md, key=key)

    @requires_sha3
    def test_case_sha3_224_0(self):
        self.check('sha3_224', b"",
          "6b4e03423667dbb73b6e15454f0eb1abd4597f9a1b078e3f5b5a6bc7")

    @requires_sha3
    def test_case_sha3_224_vector(self):
        for msg, md in read_vectors('sha3_224'):
            self.check('sha3_224', msg, md)

    @requires_sha3
    def test_case_sha3_256_0(self):
        self.check('sha3_256', b"",
          "a7ffc6f8bf1ed76651c14756a061d662f580ff4de43b49fa82d80a4b80f8434a")

    @requires_sha3
    def test_case_sha3_256_vector(self):
        for msg, md in read_vectors('sha3_256'):
            self.check('sha3_256', msg, md)

    @requires_sha3
    def test_case_sha3_384_0(self):
        self.check('sha3_384', b"",
          "0c63a75b845e4f7d01107d852e4c2485c51a50aaaa94fc61995e71bbee983a2a"+
          "c3713831264adb47fb6bd1e058d5f004")

    @requires_sha3
    def test_case_sha3_384_vector(self):
        for msg, md in read_vectors('sha3_384'):
            self.check('sha3_384', msg, md)

    @requires_sha3
    def test_case_sha3_512_0(self):
        self.check('sha3_512', b"",
          "a69f73cca23a9ac5c8b567dc185a756e97c982164fe25859e0d1dcc1475c80a6"+
          "15b2123af1f5f94c11e3e9402c3ac558f500199d95b6d3e301758586281dcd26")

    @requires_sha3
    def test_case_sha3_512_vector(self):
        for msg, md in read_vectors('sha3_512'):
            self.check('sha3_512', msg, md)

    @requires_sha3
    def test_case_shake_128_0(self):
        self.check('shake_128', b"",
          "7f9c2ba4e88f827d616045507605853ed73b8093f6efbc88eb1a6eacfa66ef26",
          True)
        self.check('shake_128', b"", "7f9c", True)

    @requires_sha3
    def test_case_shake128_vector(self):
        for msg, md in read_vectors('shake_128'):
            self.check('shake_128', msg, md, True)

    @requires_sha3
    def test_case_shake_256_0(self):
        self.check('shake_256', b"",
          "46b9dd2b0ba88d13233b3feb743eeb243fcd52ea62b81b82b50c27646ed5762f",
          True)
        self.check('shake_256', b"", "46b9", True)

    @requires_sha3
    def test_case_shake256_vector(self):
        for msg, md in read_vectors('shake_256'):
            self.check('shake_256', msg, md, True)

    def test_gil(self):
        # Check things work fine with an input larger than the size required
        # for multithreaded operation (which is hardwired to 2048).
        gil_minsize = 2048

        for cons in self.hash_constructors:
            m = cons()
            m.update(b'1')
            m.update(b'#' * gil_minsize)
            m.update(b'1')

            m = cons(b'x' * gil_minsize)
            m.update(b'1')

        m = hashlib.md5()
        m.update(b'1')
        m.update(b'#' * gil_minsize)
        m.update(b'1')
        self.assertEqual(m.hexdigest(), 'cb1e1a2cbc80be75e19935d621fb9b21')

        m = hashlib.md5(b'x' * gil_minsize)
        self.assertEqual(m.hexdigest(), 'cfb767f225d58469c5de3632a8803958')

    @support.reap_threads
    def test_threaded_hashing(self):
        # Updating the same hash object from several threads at once
        # using data chunk sizes containing the same byte sequences.
        #
        # If the internal locks are working to prevent multiple
        # updates on the same object from running at once, the resulting
        # hash will be the same as doing it single threaded upfront.
        hasher = hashlib.sha1()
        num_threads = 5
        smallest_data = b'swineflu'
        data = smallest_data * 200000
        expected_hash = hashlib.sha1(data*num_threads).hexdigest()

        def hash_in_chunks(chunk_size):
            index = 0
            while index < len(data):
                hasher.update(data[index:index + chunk_size])
                index += chunk_size

        threads = []
        for threadnum in range(num_threads):
            chunk_size = len(data) // (10 ** threadnum)
            self.assertGreater(chunk_size, 0)
            self.assertEqual(chunk_size % len(smallest_data), 0)
            thread = threading.Thread(target=hash_in_chunks,
                                      args=(chunk_size,))
            threads.append(thread)

        for thread in threads:
            thread.start()
        for thread in threads:
            thread.join()

        self.assertEqual(expected_hash, hasher.hexdigest())


class KDFTests(unittest.TestCase):

    pbkdf2_test_vectors = [
        (b'password', b'salt', 1, None),
        (b'password', b'salt', 2, None),
        (b'password', b'salt', 4096, None),
        # too slow, it takes over a minute on a fast CPU.
        #(b'password', b'salt', 16777216, None),
        (b'passwordPASSWORDpassword', b'saltSALTsaltSALTsaltSALTsaltSALTsalt',
         4096, -1),
        (b'pass\0word', b'sa\0lt', 4096, 16),
    ]

    scrypt_test_vectors = [
        (b'', b'', 16, 1, 1, unhexlify('77d6576238657b203b19ca42c18a0497f16b4844e3074ae8dfdffa3fede21442fcd0069ded0948f8326a753a0fc81f17e8d3e0fb2e0d3628cf35e20c38d18906')),
        (b'password', b'NaCl', 1024, 8, 16, unhexlify('fdbabe1c9d3472007856e7190d01e9fe7c6ad7cbc8237830e77376634b3731622eaf30d92e22a3886ff109279d9830dac727afb94a83ee6d8360cbdfa2cc0640')),
        (b'pleaseletmein', b'SodiumChloride', 16384, 8, 1, unhexlify('7023bdcb3afd7348461c06cd81fd38ebfda8fbba904f8e3ea9b543f6545da1f2d5432955613f0fcf62d49705242a9af9e61e85dc0d651e40dfcf017b45575887')),
   ]

    pbkdf2_results = {
        "sha1": [
            # official test vectors from RFC 6070
            (bytes.fromhex('0c60c80f961f0e71f3a9b524af6012062fe037a6'), None),
            (bytes.fromhex('ea6c014dc72d6f8ccd1ed92ace1d41f0d8de8957'), None),
            (bytes.fromhex('4b007901b765489abead49d926f721d065a429c1'), None),
            #(bytes.fromhex('eefe3d61cd4da4e4e9945b3d6ba2158c2634e984'), None),
            (bytes.fromhex('3d2eec4fe41c849b80c8d83662c0e44a8b291a964c'
                           'f2f07038'), 25),
            (bytes.fromhex('56fa6aa75548099dcc37d7f03425e0c3'), None),],
        "sha256": [
            (bytes.fromhex('120fb6cffcf8b32c43e7225256c4f837'
                           'a86548c92ccc35480805987cb70be17b'), None),
            (bytes.fromhex('ae4d0c95af6b46d32d0adff928f06dd0'
                           '2a303f8ef3c251dfd6e2d85a95474c43'), None),
            (bytes.fromhex('c5e478d59288c841aa530db6845c4c8d'
                           '962893a001ce4e11a4963873aa98134a'), None),
            #(bytes.fromhex('cf81c66fe8cfc04d1f31ecb65dab4089'
            #               'f7f179e89b3b0bcb17ad10e3ac6eba46'), None),
            (bytes.fromhex('348c89dbcbd32b2f32d814b8116e84cf2b17'
                           '347ebc1800181c4e2a1fb8dd53e1c635518c7dac47e9'), 40),
            (bytes.fromhex('89b69d0516f829893c696226650a8687'), None),],
        "sha512": [
            (bytes.fromhex('867f70cf1ade02cff3752599a3a53dc4af34c7a669815ae5'
                           'd513554e1c8cf252c02d470a285a0501bad999bfe943c08f'
                           '050235d7d68b1da55e63f73b60a57fce'), None),
            (bytes.fromhex('e1d9c16aa681708a45f5c7c4e215ceb66e011a2e9f004071'
                           '3f18aefdb866d53cf76cab2868a39b9f7840edce4fef5a82'
                           'be67335c77a6068e04112754f27ccf4e'), None),
            (bytes.fromhex('d197b1b33db0143e018b12f3d1d1479e6cdebdcc97c5c0f8'
                           '7f6902e072f457b5143f30602641b3d55cd335988cb36b84'
                           '376060ecd532e039b742a239434af2d5'), None),
            (bytes.fromhex('8c0511f4c6e597c6ac6315d8f0362e225f3c501495ba23b8'
                           '68c005174dc4ee71115b59f9e60cd9532fa33e0f75aefe30'
                           '225c583a186cd82bd4daea9724a3d3b8'), 64),
            (bytes.fromhex('9d9e9c4cd21fe4be24d5b8244c759665'), None),],
    }

    def _test_pbkdf2_hmac(self, pbkdf2):
        for digest_name, results in self.pbkdf2_results.items():
            for i, vector in enumerate(self.pbkdf2_test_vectors):
                password, salt, rounds, dklen = vector
                expected, overwrite_dklen = results[i]
                if overwrite_dklen:
                    dklen = overwrite_dklen
                out = pbkdf2(digest_name, password, salt, rounds, dklen)
                self.assertEqual(out, expected,
                                 (digest_name, password, salt, rounds, dklen))
                out = pbkdf2(digest_name, memoryview(password),
                             memoryview(salt), rounds, dklen)
                out = pbkdf2(digest_name, bytearray(password),
                             bytearray(salt), rounds, dklen)
                self.assertEqual(out, expected)
                if dklen is None:
                    out = pbkdf2(digest_name, password, salt, rounds)
                    self.assertEqual(out, expected,
                                     (digest_name, password, salt, rounds))

        self.assertRaises(TypeError, pbkdf2, b'sha1', b'pass', b'salt', 1)
        self.assertRaises(TypeError, pbkdf2, 'sha1', 'pass', 'salt', 1)
        self.assertRaises(ValueError, pbkdf2, 'sha1', b'pass', b'salt', 0)
        self.assertRaises(ValueError, pbkdf2, 'sha1', b'pass', b'salt', -1)
        self.assertRaises(ValueError, pbkdf2, 'sha1', b'pass', b'salt', 1, 0)
        self.assertRaises(ValueError, pbkdf2, 'sha1', b'pass', b'salt', 1, -1)
        with self.assertRaisesRegex(ValueError, 'unsupported hash type'):
            pbkdf2('unknown', b'pass', b'salt', 1)
        out = pbkdf2(hash_name='sha1', password=b'password', salt=b'salt',
            iterations=1, dklen=None)
        self.assertEqual(out, self.pbkdf2_results['sha1'][0][0])

    def test_pbkdf2_hmac_py(self):
        self._test_pbkdf2_hmac(py_hashlib.pbkdf2_hmac)

    @unittest.skipUnless(hasattr(c_hashlib, 'pbkdf2_hmac'),
                     '   test requires OpenSSL > 1.0')
    def test_pbkdf2_hmac_c(self):
        self._test_pbkdf2_hmac(c_hashlib.pbkdf2_hmac)


    @unittest.skipUnless(hasattr(c_hashlib, 'scrypt'),
                     '   test requires OpenSSL > 1.1')
    def test_scrypt(self):
        for password, salt, n, r, p, expected in self.scrypt_test_vectors:
            result = hashlib.scrypt(password, salt=salt, n=n, r=r, p=p)
            self.assertEqual(result, expected)

        # this values should work
        hashlib.scrypt(b'password', salt=b'salt', n=2, r=8, p=1)
        # password and salt must be bytes-like
        with self.assertRaises(TypeError):
            hashlib.scrypt('password', salt=b'salt', n=2, r=8, p=1)
        with self.assertRaises(TypeError):
            hashlib.scrypt(b'password', salt='salt', n=2, r=8, p=1)
        # require keyword args
        with self.assertRaises(TypeError):
            hashlib.scrypt(b'password')
        with self.assertRaises(TypeError):
            hashlib.scrypt(b'password', b'salt')
        with self.assertRaises(TypeError):
            hashlib.scrypt(b'password', 2, 8, 1, salt=b'salt')
        for n in [-1, 0, 1, None]:
            with self.assertRaises((ValueError, OverflowError, TypeError)):
                hashlib.scrypt(b'password', salt=b'salt', n=n, r=8, p=1)
        for r in [-1, 0, None]:
            with self.assertRaises((ValueError, OverflowError, TypeError)):
                hashlib.scrypt(b'password', salt=b'salt', n=2, r=r, p=1)
        for p in [-1, 0, None]:
            with self.assertRaises((ValueError, OverflowError, TypeError)):
                hashlib.scrypt(b'password', salt=b'salt', n=2, r=8, p=p)
        for maxmem in [-1, None]:
            with self.assertRaises((ValueError, OverflowError, TypeError)):
                hashlib.scrypt(b'password', salt=b'salt', n=2, r=8, p=1,
                               maxmem=maxmem)
        for dklen in [-1, None]:
            with self.assertRaises((ValueError, OverflowError, TypeError)):
                hashlib.scrypt(b'password', salt=b'salt', n=2, r=8, p=1,
                               dklen=dklen)

    def test_normalized_name(self):
        self.assertNotIn("blake2b512", hashlib.algorithms_available)
        self.assertNotIn("sha3-512", hashlib.algorithms_available)


if __name__ == "__main__":
    unittest.main()
