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.\" ========================================================================
.\"
.IX Title "EVP_PKEY-HMAC 7ossl"
.TH EVP_PKEY-HMAC 7ossl "2024-10-22" "3.4.0" "OpenSSL"
.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.nh
.SH "NAME"
EVP_PKEY\-HMAC, EVP_KEYMGMT\-HMAC, EVP_PKEY\-Siphash, EVP_KEYMGMT\-Siphash,
EVP_PKEY\-Poly1305, EVP_KEYMGMT\-Poly1305, EVP_PKEY\-CMAC, EVP_KEYMGMT\-CMAC
\&\- EVP_PKEY legacy MAC keytypes and algorithm support
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The \fB\s-1HMAC\s0\fR and \fB\s-1CMAC\s0\fR key types are implemented in OpenSSL's default and \s-1FIPS\s0
providers. Additionally the \fBSiphash\fR and \fBPoly1305\fR key types are implemented
in the default provider. Performing \s-1MAC\s0 operations via an \s-1EVP_PKEY\s0
is considered legacy and are only available for backwards compatibility purposes
and for a restricted set of algorithms. The preferred way of performing \s-1MAC\s0
operations is via the \s-1EVP_MAC\s0 APIs. See \fBEVP_MAC_init\fR\|(3).
.PP
For further details on using \s-1EVP_PKEY\s0 based \s-1MAC\s0 keys see
\&\s-1\fBEVP_SIGNATURE\-HMAC\s0\fR\|(7), \fBEVP_SIGNATURE\-Siphash\fR\|(7),
\&\fBEVP_SIGNATURE\-Poly1305\fR\|(7) or \s-1\fBEVP_SIGNATURE\-CMAC\s0\fR\|(7).
.SS "Common \s-1MAC\s0 parameters"
.IX Subsection "Common MAC parameters"
All the \fB\s-1MAC\s0\fR keytypes support the following parameters.
.ie n .IP """priv"" (\fB\s-1OSSL_PKEY_PARAM_PRIV_KEY\s0\fR) <octet string>" 4
.el .IP "``priv'' (\fB\s-1OSSL_PKEY_PARAM_PRIV_KEY\s0\fR) <octet string>" 4
.IX Item "priv (OSSL_PKEY_PARAM_PRIV_KEY) <octet string>"
The \s-1MAC\s0 key value.
.ie n .IP """properties"" (\fB\s-1OSSL_PKEY_PARAM_PROPERTIES\s0\fR) <\s-1UTF8\s0 string>" 4
.el .IP "``properties'' (\fB\s-1OSSL_PKEY_PARAM_PROPERTIES\s0\fR) <\s-1UTF8\s0 string>" 4
.IX Item "properties (OSSL_PKEY_PARAM_PROPERTIES) <UTF8 string>"
A property query string to be used when any algorithms are fetched.
.SS "\s-1CMAC\s0 parameters"
.IX Subsection "CMAC parameters"
As well as the parameters described above, the \fB\s-1CMAC\s0\fR keytype additionally
supports the following parameters.
.ie n .IP """cipher"" (\fB\s-1OSSL_PKEY_PARAM_CIPHER\s0\fR) <\s-1UTF8\s0 string>" 4
.el .IP "``cipher'' (\fB\s-1OSSL_PKEY_PARAM_CIPHER\s0\fR) <\s-1UTF8\s0 string>" 4
.IX Item "cipher (OSSL_PKEY_PARAM_CIPHER) <UTF8 string>"
The name of a cipher to be used when generating the \s-1MAC.\s0
.ie n .IP """engine"" (\fB\s-1OSSL_PKEY_PARAM_ENGINE\s0\fR) <\s-1UTF8\s0 string>" 4
.el .IP "``engine'' (\fB\s-1OSSL_PKEY_PARAM_ENGINE\s0\fR) <\s-1UTF8\s0 string>" 4
.IX Item "engine (OSSL_PKEY_PARAM_ENGINE) <UTF8 string>"
The name of an engine to be used for the specified cipher (if any).
.SS "Common \s-1MAC\s0 key generation parameters"
.IX Subsection "Common MAC key generation parameters"
\&\s-1MAC\s0 key generation is unusual in that no new key is actually generated. Instead
a new provider side key object is created with the supplied raw key value. This
is done for backwards compatibility with previous versions of OpenSSL.
.ie n .IP """priv"" (\fB\s-1OSSL_PKEY_PARAM_PRIV_KEY\s0\fR) <octet string>" 4
.el .IP "``priv'' (\fB\s-1OSSL_PKEY_PARAM_PRIV_KEY\s0\fR) <octet string>" 4
.IX Item "priv (OSSL_PKEY_PARAM_PRIV_KEY) <octet string>"
The \s-1MAC\s0 key value.
.SS "\s-1CMAC\s0 key generation parameters"
.IX Subsection "CMAC key generation parameters"
In addition to the common \s-1MAC\s0 key generation parameters, the \s-1CMAC\s0 key generation
additionally recognises the following.
.ie n .IP """cipher"" (\fB\s-1OSSL_PKEY_PARAM_CIPHER\s0\fR) <\s-1UTF8\s0 string>" 4
.el .IP "``cipher'' (\fB\s-1OSSL_PKEY_PARAM_CIPHER\s0\fR) <\s-1UTF8\s0 string>" 4
.IX Item "cipher (OSSL_PKEY_PARAM_CIPHER) <UTF8 string>"
The name of a cipher to be used when generating the \s-1MAC.\s0
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\s-1\fBEVP_KEYMGMT\s0\fR\|(3), \s-1\fBEVP_PKEY\s0\fR\|(3), \fBprovider\-keymgmt\fR\|(7)
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2020 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>.
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