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.
This implementation is identified with this name and properties, to be used with
EVP_MAC_fetch():
- "HMAC", "provider=default" or
"provider=fips"
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():
- "key" (OSSL_MAC_PARAM_KEY) <octet
string>
- Sets the MAC key. Setting this parameter is identical to
passing a key to EVP_MAC_init(3).
- "digest" (OSSL_MAC_PARAM_DIGEST) <UTF8
string>
- Sets the name of the underlying digest to be used.
- "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 ("digest", or OSSL_MAC_PARAM_DIGEST) to be
considered valid.
- "digest-noinit"
(OSSL_MAC_PARAM_DIGEST_NOINIT) <integer>
- A flag to set the MAC digest to not initialise the
implementation specific data. The value 0 or 1 is expected.
- "digest-oneshot"
(OSSL_MAC_PARAM_DIGEST_ONESHOT) <integer>
- A flag to set the MAC digest to be a one-shot operation.
The value 0 or 1 is expected.
- "tls-data-size"
(OSSL_MAC_PARAM_TLS_DATA_SIZE) <unsigned integer>
The following parameter can be retrieved with
EVP_MAC_CTX_get_params():
- "size" (OSSL_MAC_PARAM_SIZE) <unsigned
integer>
- 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.
- "block-size" (OSSL_MAC_PARAM_BLOCK_SIZE)
<unsigned integer>
- 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 2018-2021 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
<
https://www.openssl.org/source/license.html>.