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=head1 NAME

EVP_SIGNATURE-HMAC, EVP_SIGNATURE-SIPHASH, EVP_SIGNATURE-POLY1305,
EVP_SIGNATURE-CMAC
- The legacy B<EVP_PKEY> MAC signature implementations

=head1 DESCRIPTION

The algorithms described here have legacy support for creating MACs using
L<EVP_DigestSignInit(3)> and related functions. This is not the preferred way of
creating MACs. Instead you should use the newer L<EVP_MAC_init(3)> functions.
This mechanism is provided for backwards compatibility with older versions of
OpenSSL. 

There are no parameters supported by the legacy EVP_PKEY MAC signature
algorithms. See L<EVP_PKEY-HMAC(7)>, L<EVP_PKEY-SIPHASH(7)>,
L<EVP_PKEY-POLY1305(7)> or L<EVP_PKEY-CMAC(7)> for details about parameters that
are supported during the creation of an EVP_PKEY.

=head1 SEE ALSO

L<EVP_MAC_init(3)>,
L<EVP_DigestSignInit(3)>,
L<EVP_PKEY-HMAC(7)>,
L<EVP_PKEY-SIPHASH(7)>,
L<EVP_PKEY-POLY1305(7)>,
L<EVP_PKEY-CMAC(7)>,
L<provider-signature(7)>,

=head1 COPYRIGHT

Copyright 2020 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the Apache License 2.0 (the "License").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file LICENSE in the source distribution or at
L<https://www.openssl.org/source/license.html>.

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