EVP_MAC-GMAC(7)

NAME
EVP_MAC-GMAC - The GMAC EVP_MAC implementation

DESCRIPTION
Support for computing GMAC MACs through the EVP_MAC API.

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

"GMAC", "provider=default" or "provider=fips"

  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():

"key" (OSSL_MAC_PARAM_KEY) <octet string>
"iv" (OSSL_MAC_PARAM_IV) <octet string>
"cipher" (OSSL_MAC_PARAM_CIPHER) <UTF8 string>
"properties" (OSSL_MAC_PARAM_PROPERTIES) <UTF8 string>

The following parameters 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_size(). The length of the "size" parameter is equal to that of an unsigned int.

SEE ALSO
EVP_MAC_CTX_get_params(3), EVP_MAC_CTX_set_params(3), "PARAMETERS" in EVP_MAC(3), OSSL_PARAM(3)

COPYRIGHT
Copyright 2018-2019 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>.