5 EVP_MAC-Poly1305 - The Poly1305 EVP_MAC implementation
9 Support for computing Poly1305 MACs through the B<EVP_MAC> API.
13 This implementation is identified with this name and properties, to be
14 used with EVP_MAC_fetch():
18 =item "POLY1305", "provider=default"
22 =head2 Supported parameters
24 The general description of these parameters can be found in
25 L<EVP_MAC(3)/PARAMETERS>.
27 The following parameter can be set with EVP_MAC_CTX_set_params():
31 =item "key" (B<OSSL_MAC_PARAM_KEY>) <octet string>
34 Setting this parameter is identical to passing a I<key> to L<EVP_MAC_init(3)>.
38 The following parameters can be retrieved with
39 EVP_MAC_CTX_get_params():
43 =item "size" (B<OSSL_MAC_PARAM_SIZE>) <unsigned integer>
49 The "size" parameter can also be retrieved with with EVP_MAC_CTX_get_mac_size().
50 The length of the "size" parameter should not exceed that of an B<unsigned int>.
54 The OpenSSL implementation of the Poly 1305 MAC corresponds to RFC 7539.
56 It is critical to never reuse the key. The security implication noted in
57 RFC 8439 applies equally to the OpenSSL implementation.
61 L<EVP_MAC_CTX_get_params(3)>, L<EVP_MAC_CTX_set_params(3)>,
62 L<EVP_MAC(3)/PARAMETERS>, L<OSSL_PARAM(3)>
66 Copyright 2018-2021 The OpenSSL Project Authors. All Rights Reserved.
68 Licensed under the Apache License 2.0 (the "License"). You may not use
69 this file except in compliance with the License. You can obtain a copy
70 in the file LICENSE in the source distribution or at
71 L<https://www.openssl.org/source/license.html>.