diff --git a/Doc/library/hmac.rst b/Doc/library/hmac.rst
@@ -114,6 +114,12 @@ A hash object has the following attributes:
   .. versionadded:: 3.4


This module also provides the following helper function:

.. function:: compare_digest(a, b)

diff --git a/Lib/hmac.py b/Lib/hmac.py
@@ -30,6 +30,10 @@ class HMAC:
    """
    blocksize = 64  # 512-bit HMAC; can be changed in subclasses.

    def __init__(self, key, msg=None, digestmod=''):
        """Create a new HMAC object.

@@ -51,18 +55,18 @@ def __init__(self, key, msg=None, digestmod=''):
            raise TypeError("Missing required parameter 'digestmod'.")

        if callable(digestmod):
-            self.digest_cons = digestmod
        elif isinstance(digestmod, str):
-            self.digest_cons = lambda d=b'': _hashlib.new(digestmod, d)
        else:
-            self.digest_cons = lambda d=b'': digestmod.new(d)

-        self.outer = self.digest_cons()
-        self.inner = self.digest_cons()
-        self.digest_size = self.inner.digest_size

-        if hasattr(self.inner, 'block_size'):
-            blocksize = self.inner.block_size
            if blocksize < 16:
                _warnings.warn('block_size of %d seems too small; using our '
                               'default of %d.' % (blocksize, self.blocksize),
@@ -79,21 +83,33 @@ def __init__(self, key, msg=None, digestmod=''):
        self.block_size = blocksize

        if len(key) > blocksize:
-            key = self.digest_cons(key).digest()

        key = key.ljust(blocksize, b'\0')
-        self.outer.update(key.translate(trans_5C))
-        self.inner.update(key.translate(trans_36))
        if msg is not None:
            self.update(msg)

    @property
    def name(self):
-        return "hmac-" + self.inner.name

    def update(self, msg):
        """Feed data from msg into this hashing object."""
-        self.inner.update(msg)

    def copy(self):
        """Return a separate copy of this hashing object.
@@ -102,19 +118,19 @@ def copy(self):
        """
        # Call __new__ directly to avoid the expensive __init__.
        other = self.__class__.__new__(self.__class__)
-        other.digest_cons = self.digest_cons
        other.digest_size = self.digest_size
-        other.inner = self.inner.copy()
-        other.outer = self.outer.copy()
        return other

    def _current(self):
        """Return a hash object for the current state.

        To be used only internally with digest() and hexdigest().
        """
-        h = self.outer.copy()
-        h.update(self.inner.digest())
        return h

    def digest(self):

diff --git a/Misc/NEWS.d/next/Library/2020-05-16-19-34-38.bpo-40645.7ibMt-.rst b/Misc/NEWS.d/next/Library/2020-05-16-19-34-38.bpo-40645.7ibMt-.rst
@@ -0,0 +1,3 @@
Original file line number	Diff line number	Diff line change
Expand Up		@@ -114,6 +114,12 @@ A hash object has the following attributes:
		.. versionadded:: 3.4


		This module also provides the following helper function:

		.. function:: compare_digest(a, b)