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.IX Title "EVP_MAC-SIPHASH 7SSL"
.TH EVP_MAC-SIPHASH 7SSL 2024-04-11 3.3.0 OpenSSL
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.nh
.SH NAME
EVP_MAC\-Siphash \- The Siphash EVP_MAC implementation
.SH DESCRIPTION
.IX Header "DESCRIPTION"
Support for computing Siphash MACs through the \fBEVP_MAC\fR API.
.SS Identity
.IX Subsection "Identity"
This implementation is identified with this name and properties, to be
used with \fBEVP_MAC_fetch()\fR:
.IP """SIPHASH"", ""provider=default""" 4
.IX Item """SIPHASH"", ""provider=default"""
.SS "Supported parameters"
.IX Subsection "Supported parameters"
The general description of these parameters can be found in
"PARAMETERS" in \fBEVP_MAC\fR\|(3).
.PP
All these parameters can be set with \fBEVP_MAC_CTX_set_params()\fR.
Furthermore, the "size" parameter can be retrieved with
\&\fBEVP_MAC_CTX_get_params()\fR, or with \fBEVP_MAC_CTX_get_mac_size()\fR.
The length of the "size" parameter should not exceed that of a \fBsize_t\fR.
.IP """key"" (\fBOSSL_MAC_PARAM_KEY\fR) <octet string>" 4
.IX Item """key"" (OSSL_MAC_PARAM_KEY) <octet string>"
Sets the MAC key.
Setting this parameter is identical to passing a \fIkey\fR to \fBEVP_MAC_init\fR\|(3).
.IP """size"" (\fBOSSL_MAC_PARAM_SIZE\fR) <unsigned integer>" 4
.IX Item """size"" (OSSL_MAC_PARAM_SIZE) <unsigned integer>"
Sets the MAC size.
.IP """c\-rounds"" (\fBOSSL_MAC_PARAM_C_ROUNDS\fR) <unsigned integer>" 4
.IX Item """c-rounds"" (OSSL_MAC_PARAM_C_ROUNDS) <unsigned integer>"
Specifies the number of rounds per message block.  By default this is \fI2\fR.
.IP """d\-rounds"" (\fBOSSL_MAC_PARAM_D_ROUNDS\fR) <unsigned integer>" 4
.IX Item """d-rounds"" (OSSL_MAC_PARAM_D_ROUNDS) <unsigned integer>"
Specifies the number of finalisation rounds.  By default this is \fI4\fR.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBEVP_MAC_CTX_get_params\fR\|(3), \fBEVP_MAC_CTX_set_params\fR\|(3),
"PARAMETERS" in \fBEVP_MAC\fR\|(3), \fBOSSL_PARAM\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 "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>.