1=pod 2 3=head1 NAME 4 5EVP_MAC-CMAC - The CMAC EVP_MAC implementation 6 7=head1 DESCRIPTION 8 9Support for computing CMAC MACs through the B<EVP_MAC> API. 10 11This implementation uses EVP_CIPHER functions to get access to the underlying 12cipher. 13 14=head2 Identity 15 16This implementation is identified with this name and properties, to be 17used with EVP_MAC_fetch(): 18 19=over 4 20 21=item "CMAC", "provider=default" or "provider=fips" 22 23=back 24 25=head2 Supported parameters 26 27The general description of these parameters can be found in 28L<EVP_MAC(3)/PARAMETERS>. 29 30The following parameter can be set with EVP_MAC_CTX_set_params(): 31 32=over 4 33 34=item "key" (B<OSSL_MAC_PARAM_KEY>) <octet string> 35 36Sets the MAC key. 37Setting this parameter is identical to passing a I<key> to L<EVP_MAC_init(3)>. 38 39=item "cipher" (B<OSSL_MAC_PARAM_CIPHER>) <UTF8 string> 40 41Sets the name of the underlying cipher to be used. 42 43=item "properties" (B<OSSL_MAC_PARAM_PROPERTIES>) <UTF8 string> 44 45Sets the properties to be queried when trying to fetch the underlying cipher. 46This must be given together with the cipher naming parameter to be considered 47valid. 48 49=back 50 51The following parameters can be retrieved with 52EVP_MAC_CTX_get_params(): 53 54=over 4 55 56=item "size" (B<OSSL_MAC_PARAM_SIZE>) <unsigned integer> 57 58The "size" parameter can also be retrieved with with EVP_MAC_CTX_get_mac_size(). 59The length of the "size" parameter is equal to that of an B<unsigned int>. 60 61=back 62 63=over 4 64 65=item "block-size" (B<OSSL_MAC_PARAM_SIZE>) <unsigned integer> 66 67Gets the MAC block size. The "block-size" parameter can also be retrieved with 68EVP_MAC_CTX_get_block_size(). 69 70=back 71 72=head1 SEE ALSO 73 74L<EVP_MAC_CTX_get_params(3)>, L<EVP_MAC_CTX_set_params(3)>, 75L<EVP_MAC(3)/PARAMETERS>, L<OSSL_PARAM(3)> 76 77=head1 COPYRIGHT 78 79Copyright 2018-2021 The OpenSSL Project Authors. All Rights Reserved. 80 81Licensed under the Apache License 2.0 (the "License"). You may not use 82this file except in compliance with the License. You can obtain a copy 83in the file LICENSE in the source distribution or at 84L<https://www.openssl.org/source/license.html>. 85 86=cut 87