Cryptography and SSL/TLS Toolkit



EVP_MAC-Poly1305 - The Poly1305 EVP_MAC implementation


Support for computing Poly1305 MACs through the EVP_MAC API.


This implementation is identified with this name and properties, to be used with EVP_MAC_fetch():

"POLY1305", "provider=default"

Supported parameters

The general description of these parameters can be found in "PARAMETERS" in EVP_MAC(3).

The following parameter can be set with EVP_MAC_set_ctx_params():

"key" (OSSL_MAC_PARAM_KEY) <octet string>

The following parameters can be retrieved with EVP_MAC_get_ctx_params():

"size" (OSSL_MAC_PARAM_SIZE) <unsigned integer>

The "size" parameter can also be retrieved with with EVP_MAC_size(). The length of the "size" parameter should not exceed that of an unsigned int.


EVP_MAC_get_ctx_params(3), EVP_MAC_set_ctx_params(3), "PARAMETERS" in EVP_MAC(3), OSSL_PARAM(3)

Copyright 2018-2020 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