1=pod 2 3=head1 NAME 4 5EVP_MAC-Siphash - The Siphash EVP_MAC implementation 6 7=head1 DESCRIPTION 8 9Support for computing Siphash MACs through the B<EVP_MAC> API. 10 11=head2 Identity 12 13This implementation is identified with this name and properties, to be 14used with EVP_MAC_fetch(): 15 16=over 4 17 18=item "SIPHASH", "provider=default" 19 20=back 21 22 23=head2 Supported parameters 24 25The general description of these parameters can be found in 26L<EVP_MAC(3)/PARAMETERS>. 27 28All these parameters can be set with EVP_MAC_CTX_set_params(). 29Furthermore, the "size" parameter can be retrieved with 30EVP_MAC_CTX_get_params(), or with EVP_MAC_CTX_get_mac_size(). 31The length of the "size" parameter should not exceed that of a B<size_t>. 32 33=over 4 34 35=item "key" (B<OSSL_MAC_PARAM_KEY>) <octet string> 36 37Sets the MAC key. 38Setting this parameter is identical to passing a I<key> to L<EVP_MAC_init(3)>. 39 40=item "size" (B<OSSL_MAC_PARAM_SIZE>) <unsigned integer> 41 42Sets the MAC size. 43 44=item "c-rounds" (B<OSSL_MAC_PARAM_C_ROUNDS>) <unsigned integer> 45 46Specifies the number of rounds per message block. By default this is I<2>. 47 48=item "d-rounds" (B<OSSL_MAC_PARAM_D_ROUNDS>) <unsigned integer> 49 50Specifies the number of finalisation rounds. By default this is I<4>. 51 52=back 53 54=head1 SEE ALSO 55 56L<EVP_MAC_CTX_get_params(3)>, L<EVP_MAC_CTX_set_params(3)>, 57L<EVP_MAC(3)/PARAMETERS>, L<OSSL_PARAM(3)> 58 59=head1 COPYRIGHT 60 61Copyright 2018-2021 The OpenSSL Project Authors. All Rights Reserved. 62 63Licensed under the Apache License 2.0 (the "License"). You may not use 64this file except in compliance with the License. You can obtain a copy 65in the file LICENSE in the source distribution or at 66L<https://www.openssl.org/source/license.html>. 67 68=cut 69