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Title "EVP_MAC-HMAC 7ossl" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
EVP_MAC-HMAC - The HMAC EVP_MAC implementation Header "DESCRIPTION" Support for computing \s-1HMAC\s0 MACs through the \s-1EVP_MAC\s0 \s-1API.\s0

This implementation uses \s-1EVP_MD\s0 functions to get access to the underlying digest.

Subsection "Identity" This implementation is identified with this name and properties, to be used with EVP_MAC_fetch(): Item "HMAC, provider=default or provider=fips" Subsection "Supported parameters" The general description of these parameters can be found in \*(L"\s-1PARAMETERS\*(R"\s0 in \s-1EVP_MAC\s0\|(3).

The following parameter can be set with EVP_MAC_CTX_set_params(): Item "key (OSSL_MAC_PARAM_KEY) <octet string>" Sets the \s-1MAC\s0 key. Setting this parameter is identical to passing a key to EVP_MAC_init\|(3). Item "digest (OSSL_MAC_PARAM_DIGEST) <UTF8 string>" Sets the name of the underlying digest to be used. Item "properties (OSSL_MAC_PARAM_PROPERTIES) <UTF8 string>" Sets the properties to be queried when trying to fetch the underlying digest. This must be given together with the digest naming parameter (\*(L"digest\*(R", or \fB\s-1OSSL_MAC_PARAM_DIGEST\s0) to be considered valid. Item "digest-noinit (OSSL_MAC_PARAM_DIGEST_NOINIT) <integer>" A flag to set the \s-1MAC\s0 digest to not initialise the implementation specific data. The value 0 or 1 is expected. Item "digest-oneshot (OSSL_MAC_PARAM_DIGEST_ONESHOT) <integer>" A flag to set the \s-1MAC\s0 digest to be a one-shot operation. The value 0 or 1 is expected. Item "tls-data-size (OSSL_MAC_PARAM_TLS_DATA_SIZE) <unsigned integer>"

The following parameter can be retrieved with EVP_MAC_CTX_get_params(): Item "size (OSSL_MAC_PARAM_SIZE) <unsigned integer>" The \*(L"size\*(R" parameter can also be retrieved with EVP_MAC_CTX_get_mac_size(). The length of the \*(L"size\*(R" parameter is equal to that of an unsigned int. Item "block-size (OSSL_MAC_PARAM_SIZE) <unsigned integer>" Gets the \s-1MAC\s0 block size. The \*(L"block-size\*(R" parameter can also be retrieved with \fBEVP_MAC_CTX_get_block_size().

Header "SEE ALSO" \fBEVP_MAC_CTX_get_params\|(3), EVP_MAC_CTX_set_params\|(3), \*(L"\s-1PARAMETERS\*(R"\s0 in \s-1EVP_MAC\s0\|(3), \s-1OSSL_PARAM\s0\|(3), \s-1HMAC\s0\|(3) Header "COPYRIGHT" Copyright 2018-2021 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.