203 lines
7.0 KiB
Plaintext
203 lines
7.0 KiB
Plaintext
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.\" ========================================================================
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.\"
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.IX Title "EVP_MAC-GMAC 7ossl"
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.TH EVP_MAC-GMAC 7ossl "2024-01-30" "3.2.1" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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EVP_MAC\-GMAC \- The GMAC EVP_MAC implementation
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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Support for computing \s-1GMAC\s0 MACs through the \fB\s-1EVP_MAC\s0\fR \s-1API.\s0
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.PP
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This implementation uses \s-1EVP_CIPHER\s0 functions to get access to the underlying
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cipher.
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.SS "Identity"
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.IX Subsection "Identity"
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This implementation is identified with this name and properties, to be
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used with \fIEVP_MAC_fetch()\fR:
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.ie n .IP """\s-1GMAC"", \s0""provider=default"" or ""provider=fips""" 4
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.el .IP "``\s-1GMAC'', \s0``provider=default'' or ``provider=fips''" 4
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.IX Item "GMAC, provider=default or provider=fips"
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.SS "Supported parameters"
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.IX Subsection "Supported parameters"
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The general description of these parameters can be found in
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\&\*(L"\s-1PARAMETERS\*(R"\s0 in \s-1\fIEVP_MAC\s0\fR\|(3).
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.PP
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The following parameter can be set with \fIEVP_MAC_CTX_set_params()\fR:
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.ie n .IP """key"" (\fB\s-1OSSL_MAC_PARAM_KEY\s0\fR) <octet string>" 4
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.el .IP "``key'' (\fB\s-1OSSL_MAC_PARAM_KEY\s0\fR) <octet string>" 4
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.IX Item "key (OSSL_MAC_PARAM_KEY) <octet string>"
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Sets the \s-1MAC\s0 key.
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Setting this parameter is identical to passing a \fIkey\fR to \fIEVP_MAC_init\fR\|(3).
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.ie n .IP """iv"" (\fB\s-1OSSL_MAC_PARAM_IV\s0\fR) <octet string>" 4
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.el .IP "``iv'' (\fB\s-1OSSL_MAC_PARAM_IV\s0\fR) <octet string>" 4
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.IX Item "iv (OSSL_MAC_PARAM_IV) <octet string>"
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Sets the \s-1IV\s0 of the underlying cipher, when applicable.
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.ie n .IP """cipher"" (\fB\s-1OSSL_MAC_PARAM_CIPHER\s0\fR) <\s-1UTF8\s0 string>" 4
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.el .IP "``cipher'' (\fB\s-1OSSL_MAC_PARAM_CIPHER\s0\fR) <\s-1UTF8\s0 string>" 4
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.IX Item "cipher (OSSL_MAC_PARAM_CIPHER) <UTF8 string>"
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Sets the name of the underlying cipher to be used.
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.ie n .IP """properties"" (\fB\s-1OSSL_MAC_PARAM_PROPERTIES\s0\fR) <\s-1UTF8\s0 string>" 4
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.el .IP "``properties'' (\fB\s-1OSSL_MAC_PARAM_PROPERTIES\s0\fR) <\s-1UTF8\s0 string>" 4
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.IX Item "properties (OSSL_MAC_PARAM_PROPERTIES) <UTF8 string>"
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Sets the properties to be queried when trying to fetch the underlying cipher.
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This must be given together with the cipher naming parameter to be considered
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valid.
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.PP
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The following parameters can be retrieved with
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\&\fIEVP_MAC_CTX_get_params()\fR:
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.ie n .IP """size"" (\fB\s-1OSSL_MAC_PARAM_SIZE\s0\fR) <unsigned integer>" 4
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.el .IP "``size'' (\fB\s-1OSSL_MAC_PARAM_SIZE\s0\fR) <unsigned integer>" 4
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.IX Item "size (OSSL_MAC_PARAM_SIZE) <unsigned integer>"
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Gets the \s-1MAC\s0 size.
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.PP
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The \*(L"size\*(R" parameter can also be retrieved with \fIEVP_MAC_CTX_get_mac_size()\fR.
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The length of the \*(L"size\*(R" parameter is equal to that of an \fBunsigned int\fR.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIEVP_MAC_CTX_get_params\fR\|(3), \fIEVP_MAC_CTX_set_params\fR\|(3),
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\&\*(L"\s-1PARAMETERS\*(R"\s0 in \s-1\fIEVP_MAC\s0\fR\|(3), \s-1\fIOSSL_PARAM\s0\fR\|(3)
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.SH "COPYRIGHT"
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.IX Header "COPYRIGHT"
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Copyright 2018\-2021 The OpenSSL Project Authors. All Rights Reserved.
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.PP
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Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file \s-1LICENSE\s0 in the source distribution or at
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<https://www.openssl.org/source/license.html>.
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