Method assert_hmac

Lib/test/test_hmac.py:234–275

Check that HMAC(key, msg) == digest. The 'hashfunc' and 'hashname' are used as 'digestmod' values, thereby allowing to test the underlying dispatching mechanism. Note that 'hashfunc' may be a string, a callable, or a PEP-257 module. Note that not all HMAC implementa

(
        self, key, msg, hexdigest, hashfunc, hashname, digest_size, block_size
    )

        return self.hmac_digest(key, msg, digestmod=hashname)

    def assert_hmac(
        self, key, msg, hexdigest, hashfunc, hashname, digest_size, block_size
    ):
        """Check that HMAC(key, msg) == digest.

        The 'hashfunc' and 'hashname' are used as 'digestmod' values,
        thereby allowing to test the underlying dispatching mechanism.

        Note that 'hashfunc' may be a string, a callable, or a PEP-257
        module. Note that not all HMAC implementations may recognize the
        same set of types for 'hashfunc', but they should always accept
        a hash function by its name.
        """
        if hashfunc == hashname:
            choices = [hashname]
        else:
            choices = [hashfunc, hashname]

        for digestmod in choices:
            with self.subTest(digestmod=digestmod):
                self.assert_hmac_new(
                    key, msg, hexdigest, digestmod,
                    hashname, digest_size, block_size
                )
                self.assert_hmac_hexdigest(
                    key, msg, hexdigest, digestmod, digest_size
                )
                self.assert_hmac_common_cases(
                    key, msg, hexdigest, digestmod,
                    hashname, digest_size, block_size
                )
                self.assert_hmac_extra_cases(
                    key, msg, hexdigest, digestmod,
                    hashname, digest_size, block_size
                )

        self.assert_hmac_new_by_name(
            key, msg, hexdigest, hashname, digest_size, block_size
        )
        self.assert_hmac_hexdigest_by_name(
            key, msg, hexdigest, hashname, digest_size
        )

    def assert_hmac_new(
        self, key, msg, hexdigest, digestmod, hashname, digest_size, block_size