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.IX Title "EVP_MAC-BLAKE2 7ossl"
.TH EVP_MAC-BLAKE2 7ossl "2023-09-19" "3.0.11" "OpenSSL"
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.nh
.SH "NAME"
EVP_MAC\-BLAKE2, EVP_MAC\-BLAKE2BMAC, EVP_MAC\-BLAKE2SMAC
\&\- The BLAKE2 EVP_MAC implementations
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Support for computing \s-1BLAKE2\s0 MACs through the \fB\s-1EVP_MAC\s0\fR \s-1API.\s0
.SS "Identity"
.IX Subsection "Identity"
These implementations are identified with one of these names and
properties, to be used with \fBEVP_MAC_fetch()\fR:
.ie n .IP """\s-1BLAKE2BMAC"",\s0 ""provider=default""" 4
.el .IP "``\s-1BLAKE2BMAC'',\s0 ``provider=default''" 4
.IX Item "BLAKE2BMAC, provider=default"
.PD 0
.ie n .IP """\s-1BLAKE2SMAC"",\s0 ""provider=default""" 4
.el .IP "``\s-1BLAKE2SMAC'',\s0 ``provider=default''" 4
.IX Item "BLAKE2SMAC, provider=default"
.PD
.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
All these parameters can be set with \fBEVP_MAC_CTX_set_params()\fR.
Furthermore, the \*(L"size\*(R" parameter can be retrieved with
\&\fBEVP_MAC_CTX_get_params()\fR, or with \fBEVP_MAC_CTX_get_mac_size()\fR.
The length of the \*(L"size\*(R" parameter should not exceed that of a \fBsize_t\fR.
Likewise, the \*(L"block-size\*(R" parameter can be retrieved with
\&\fBEVP_MAC_CTX_get_params()\fR, or with \fBEVP_MAC_CTX_get_block_size()\fR.
.ie n .IP """key"" (\fB\s-1OSSL_MAC_PARAM_KEY\s0\fR) <octet string>" 4
.el .IP "``key'' (\fB\s-1OSSL_MAC_PARAM_KEY\s0\fR) <octet string>" 4
.IX Item "key (OSSL_MAC_PARAM_KEY) <octet string>"
Sets the \s-1MAC\s0 key.
It may be at most 64 bytes for \s-1BLAKE2BMAC\s0 or 32 for \s-1BLAKE2SMAC\s0 and at
least 1 byte in both cases.
Setting this parameter is identical to passing a \fIkey\fR to \fBEVP_MAC_init\fR\|(3).
.ie n .IP """custom"" (\fB\s-1OSSL_MAC_PARAM_CUSTOM\s0\fR) <octet string>" 4
.el .IP "``custom'' (\fB\s-1OSSL_MAC_PARAM_CUSTOM\s0\fR) <octet string>" 4
.IX Item "custom (OSSL_MAC_PARAM_CUSTOM) <octet string>"
Sets the custom value.
It is an optional value of at most 16 bytes for \s-1BLAKE2BMAC\s0 or 8 for
\&\s-1BLAKE2SMAC,\s0 and is empty by default.
.ie n .IP """salt"" (\fB\s-1OSSL_MAC_PARAM_SALT\s0\fR) <octet string>" 4
.el .IP "``salt'' (\fB\s-1OSSL_MAC_PARAM_SALT\s0\fR) <octet string>" 4
.IX Item "salt (OSSL_MAC_PARAM_SALT) <octet string>"
Sets the salt.
It is an optional value of at most 16 bytes for \s-1BLAKE2BMAC\s0 or 8 for
\&\s-1BLAKE2SMAC,\s0 and is empty by default.
.ie n .IP """size"" (\fB\s-1OSSL_MAC_PARAM_SIZE\s0\fR) <unsigned integer>" 4
.el .IP "``size'' (\fB\s-1OSSL_MAC_PARAM_SIZE\s0\fR) <unsigned integer>" 4
.IX Item "size (OSSL_MAC_PARAM_SIZE) <unsigned integer>"
Sets the \s-1MAC\s0 size.
It can be any number between 1 and 32 for \s-1EVP_MAC_BLAKE2S\s0 or between 1
and 64 for \s-1EVP_MAC_BLAKE2B.\s0
It is 32 and 64 respectively by default.
.ie n .IP """block-size"" (\fB\s-1OSSL_MAC_PARAM_SIZE\s0\fR) <unsigned integer>" 4
.el .IP "``block-size'' (\fB\s-1OSSL_MAC_PARAM_SIZE\s0\fR) <unsigned integer>" 4
.IX Item "block-size (OSSL_MAC_PARAM_SIZE) <unsigned integer>"
Gets the \s-1MAC\s0 block size.
By default, it is 64 for \s-1EVP_MAC_BLAKE2S\s0 and 128 for \s-1EVP_MAC_BLAKE2B.\s0
.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 "HISTORY"
.IX Header "HISTORY"
The macros and functions described here were added to OpenSSL 3.0.
.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
<https://www.openssl.org/source/license.html>.