bpo-33604: Remove deprecated HMAC default value marked for removal in 3.8 (GH-7063)
HMAC's digestmod was deprecated marked for removal, this removes it as planned.
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@ -19,8 +19,7 @@ This module implements the HMAC algorithm as described by :rfc:`2104`.
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Return a new hmac object. *key* is a bytes or bytearray object giving the
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secret key. If *msg* is present, the method call ``update(msg)`` is made.
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*digestmod* is the digest name, digest constructor or module for the HMAC
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object to use. It supports any name suitable to :func:`hashlib.new` and
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defaults to the :data:`hashlib.md5` constructor.
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object to use. It supports any name suitable to :func:`hashlib.new`.
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.. versionchanged:: 3.4
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Parameter *key* can be a bytes or bytearray object.
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11
Lib/hmac.py
11
Lib/hmac.py
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@ -35,12 +35,9 @@ class HMAC:
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key: key for the keyed hash object.
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msg: Initial input for the hash, if provided.
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digestmod: A module supporting PEP 247. *OR*
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digestmod: Required. A module supporting PEP 247. *OR*
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A hashlib constructor returning a new hash object. *OR*
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A hash name suitable for hashlib.new().
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Defaults to hashlib.md5.
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Implicit default to hashlib.md5 is deprecated since Python
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3.4 and will be removed in Python 3.8.
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Note: key and msg must be a bytes or bytearray objects.
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"""
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@ -49,11 +46,7 @@ class HMAC:
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raise TypeError("key: expected bytes or bytearray, but got %r" % type(key).__name__)
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if digestmod is None:
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_warnings.warn("HMAC() without an explicit digestmod argument "
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"is deprecated since Python 3.4, and will be removed "
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"in 3.8",
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DeprecationWarning, 2)
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digestmod = _hashlib.md5
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raise ValueError('`digestmod` is required.')
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if callable(digestmod):
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self.digest_cons = digestmod
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@ -302,45 +302,38 @@ class TestVectorsTestCase(unittest.TestCase):
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hmac.HMAC(b'a', b'b', digestmod=MockCrazyHash)
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self.fail('Expected warning about small block_size')
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def test_with_digestmod_warning(self):
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with self.assertWarns(DeprecationWarning):
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def test_with_digestmod_no_default(self):
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with self.assertRaises(ValueError):
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key = b"\x0b" * 16
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data = b"Hi There"
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digest = "9294727A3638BB1C13F48EF8158BFC9D"
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h = hmac.HMAC(key, data)
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self.assertEqual(h.hexdigest().upper(), digest)
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hmac.HMAC(key, data, digestmod=None)
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class ConstructorTestCase(unittest.TestCase):
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@ignore_warning
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def test_normal(self):
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# Standard constructor call.
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failed = 0
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try:
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h = hmac.HMAC(b"key")
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h = hmac.HMAC(b"key", digestmod='md5')
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except Exception:
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self.fail("Standard constructor call raised exception.")
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@ignore_warning
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def test_with_str_key(self):
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# Pass a key of type str, which is an error, because it expects a key
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# of type bytes
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with self.assertRaises(TypeError):
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h = hmac.HMAC("key")
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h = hmac.HMAC("key", digestmod='md5')
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@ignore_warning
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def test_dot_new_with_str_key(self):
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# Pass a key of type str, which is an error, because it expects a key
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# of type bytes
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with self.assertRaises(TypeError):
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h = hmac.new("key")
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h = hmac.new("key", digestmod='md5')
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@ignore_warning
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def test_withtext(self):
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# Constructor call with text.
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try:
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h = hmac.HMAC(b"key", b"hash this!")
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h = hmac.HMAC(b"key", b"hash this!", digestmod='md5')
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except Exception:
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self.fail("Constructor call with text argument raised exception.")
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self.assertEqual(h.hexdigest(), '34325b639da4cfd95735b381e28cb864')
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@ -369,13 +362,6 @@ class ConstructorTestCase(unittest.TestCase):
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class SanityTestCase(unittest.TestCase):
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@ignore_warning
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def test_default_is_md5(self):
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# Testing if HMAC defaults to MD5 algorithm.
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# NOTE: this whitebox test depends on the hmac class internals
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h = hmac.HMAC(b"key")
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self.assertEqual(h.digest_cons, hashlib.md5)
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def test_exercise_all_methods(self):
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# Exercising all methods once.
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# This must not raise any exceptions
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@ -0,0 +1,2 @@
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Remove HMAC default to md5 marked for removal in 3.8 (removal originally
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planned in 3.6, bump to 3.8 in gh-7062).
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