EVP_MAC-HMAC - The HMAC EVP_MAC implementation Support for computing HMAC MACs through the EVP_MAC API. This implementation uses EVP_MD functions to get access to the underlying digest.

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

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_CTX_set_params(): Sets the MAC key. Setting this parameter is identical to passing a key to EVP_MAC_init(3). Sets the name of the underlying digest to be used. Sets the properties to be queried when trying to fetch the underlying digest. This must be given together with the digest naming parameter ("digest", or OSSL_MAC_PARAM_DIGEST) to be considered valid. A flag to set the MAC digest to not initialise the implementation specific data. The value 0 or 1 is expected. A flag to set the MAC digest to be a one-shot operation. The value 0 or 1 is expected. The following parameter can be retrieved with EVP_MAC_CTX_get_params(): The "size" parameter can also be retrieved with EVP_MAC_CTX_get_mac_size(). The length of the "size" parameter is equal to that of an unsigned int. Gets the MAC block size. The "block-size" parameter can also be retrieved with EVP_MAC_CTX_get_block_size(). EVP_MAC_CTX_get_params(3), EVP_MAC_CTX_set_params(3), "PARAMETERS" in EVP_MAC(3), OSSL_PARAM(3), HMAC(3) Copyright 2018-2023 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 <https://www.openssl.org/source/license.html>.