.\" $NetBSD: EVP_MAC-GMAC.7,v 1.2.2.3 2023/11/02 19:32:23 sborrill Exp $ .\" .\" Automatically generated by Pod::Man 4.14 (Pod::Simple 3.43) .\" .\" Standard preamble: .\" ======================================================================== .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" Set up some character translations and predefined strings. \*(-- will .\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left .\" double quote, and \*(R" will give a right double quote. \*(C+ will .\" give a nicer C++. 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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" EVP_MAC\-GMAC \- The GMAC EVP_MAC implementation .SH "DESCRIPTION" .IX Header "DESCRIPTION" Support for computing \s-1GMAC\s0 MACs through the \fB\s-1EVP_MAC\s0\fR \s-1API.\s0 .PP This implementation uses \s-1EVP_CIPHER\s0 functions to get access to the underlying cipher. .SS "Identity" .IX Subsection "Identity" This implementation is identified with this name and properties, to be used with \fBEVP_MAC_fetch()\fR: .ie n .IP """\s-1GMAC"",\s0 ""provider=default"" or ""provider=fips""" 4 .el .IP "``\s-1GMAC'',\s0 ``provider=default'' or ``provider=fips''" 4 .IX Item "GMAC, provider=default or provider=fips" .SS "Supported parameters" .IX Subsection "Supported parameters" The general description of these parameters can be found in \&\*(L"\s-1PARAMETERS\*(R"\s0 in \s-1\fBEVP_MAC\s0\fR\|(3). .PP The following parameter can be set with \fBEVP_MAC_CTX_set_params()\fR: .ie n .IP """key"" (\fB\s-1OSSL_MAC_PARAM_KEY\s0\fR) " 4 .el .IP "``key'' (\fB\s-1OSSL_MAC_PARAM_KEY\s0\fR) " 4 .IX Item "key (OSSL_MAC_PARAM_KEY) " Sets the \s-1MAC\s0 key. Setting this parameter is identical to passing a \fIkey\fR to \fBEVP_MAC_init\fR\|(3). .ie n .IP """iv"" (\fB\s-1OSSL_MAC_PARAM_IV\s0\fR) " 4 .el .IP "``iv'' (\fB\s-1OSSL_MAC_PARAM_IV\s0\fR) " 4 .IX Item "iv (OSSL_MAC_PARAM_IV) " Sets the \s-1IV\s0 of the underlying cipher, when applicable. .ie n .IP """cipher"" (\fB\s-1OSSL_MAC_PARAM_CIPHER\s0\fR) <\s-1UTF8\s0 string>" 4 .el .IP "``cipher'' (\fB\s-1OSSL_MAC_PARAM_CIPHER\s0\fR) <\s-1UTF8\s0 string>" 4 .IX Item "cipher (OSSL_MAC_PARAM_CIPHER) " Sets the name of the underlying cipher to be used. .ie n .IP """properties"" (\fB\s-1OSSL_MAC_PARAM_PROPERTIES\s0\fR) <\s-1UTF8\s0 string>" 4 .el .IP "``properties'' (\fB\s-1OSSL_MAC_PARAM_PROPERTIES\s0\fR) <\s-1UTF8\s0 string>" 4 .IX Item "properties (OSSL_MAC_PARAM_PROPERTIES) " Sets the properties to be queried when trying to fetch the underlying cipher. This must be given together with the cipher naming parameter to be considered valid. .PP The following parameters can be retrieved with \&\fBEVP_MAC_CTX_get_params()\fR: .ie n .IP """size"" (\fB\s-1OSSL_MAC_PARAM_SIZE\s0\fR) " 4 .el .IP "``size'' (\fB\s-1OSSL_MAC_PARAM_SIZE\s0\fR) " 4 .IX Item "size (OSSL_MAC_PARAM_SIZE) " Gets the \s-1MAC\s0 size. .PP The \*(L"size\*(R" parameter can also be retrieved with \fBEVP_MAC_CTX_get_mac_size()\fR. The length of the \*(L"size\*(R" parameter is equal to that of an \fBunsigned int\fR. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBEVP_MAC_CTX_get_params\fR\|(3), \fBEVP_MAC_CTX_set_params\fR\|(3), \&\*(L"\s-1PARAMETERS\*(R"\s0 in \s-1\fBEVP_MAC\s0\fR\|(3), \s-1\fBOSSL_PARAM\s0\fR\|(3) .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2018\-2021 The OpenSSL Project Authors. All Rights Reserved. .PP 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 .