=pod

=head1 NAME

EVP_SIGNATURE-HMAC, EVP_SIGNATURE-Siphash, EVP_SIGNATURE-Poly1305,
EVP_SIGNATURE-CMAC
- The legacy EVP_PKEY B<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.

The same signature parameters can be set using EVP_PKEY_CTX_set_params() as can
be set via EVP_MAC_CTX_set_params() for the underlying EVP_MAC. See
L<EVP_MAC-HMAC(7)>, L<EVP_MAC-Siphash(7)>, L<EVP_MAC-Poly1305(7)> and
L<EVP_MAC-CMAC(7)> for details.

 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<EVP_MAC-HMAC(7)>,
L<EVP_MAC-Siphash(7)>,
L<EVP_MAC-Poly1305(7)>,
L<EVP_MAC-CMAC(7)>,
L<provider-signature(7)>,

=head1 COPYRIGHT

Copyright 2020-2026 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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