| =pod |
| |
| =head1 NAME |
| |
| EVP_MAC-Poly1305 - The Poly1305 EVP_MAC implementation |
| |
| =head1 DESCRIPTION |
| |
| Support for computing Poly1305 MACs through the B<EVP_MAC> API. |
| |
| =head2 Identity |
| |
| This implementation is identified with this name and properties, to be |
| used with EVP_MAC_fetch(): |
| |
| =over 4 |
| |
| =item "POLY1305", "provider=default" |
| |
| =back |
| |
| =head2 Supported parameters |
| |
| The general description of these parameters can be found in |
| L<EVP_MAC(3)/PARAMETERS>. |
| |
| The following parameter can be set with EVP_MAC_CTX_set_params(): |
| |
| =over 4 |
| |
| =item "key" (B<OSSL_MAC_PARAM_KEY>) <octet string> |
| |
| Sets the MAC key. |
| Setting this parameter is identical to passing a I<key> to L<EVP_MAC_init(3)>. |
| |
| =back |
| |
| The following parameters can be retrieved with |
| EVP_MAC_CTX_get_params(): |
| |
| =over 4 |
| |
| =item "size" (B<OSSL_MAC_PARAM_SIZE>) <unsigned integer> |
| |
| Gets the MAC size. |
| |
| =back |
| |
| The "size" parameter can also be retrieved with with EVP_MAC_CTX_get_mac_size(). |
| The length of the "size" parameter should not exceed that of an B<unsigned int>. |
| |
| =head1 NOTES |
| |
| The OpenSSL implementation of the Poly 1305 MAC corresponds to RFC 7539. |
| |
| It is critical to never reuse the key. The security implication noted in |
| RFC 8439 applies equally to the OpenSSL implementation. |
| |
| =head1 SEE ALSO |
| |
| L<EVP_MAC_CTX_get_params(3)>, L<EVP_MAC_CTX_set_params(3)>, |
| L<EVP_MAC(3)/PARAMETERS>, L<OSSL_PARAM(3)> |
| |
| =head1 COPYRIGHT |
| |
| Copyright 2018-2021 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>. |
| |
| =cut |
