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.\" ========================================================================
.\"
.IX Title "OPENSSL-MAC 1ossl"
.TH OPENSSL-MAC 1ossl "2024-12-20" "3.1.7+quic" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
openssl\-mac \- perform Message Authentication Code operations
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
\&\fBopenssl mac\fR
[\fB\-help\fR]
[\fB\-cipher\fR]
[\fB\-digest\fR]
[\fB\-macopt\fR]
[\fB\-in\fR \fIfilename\fR]
[\fB\-out\fR \fIfilename\fR]
[\fB\-binary\fR]
[\fB\-provider\fR \fIname\fR]
[\fB\-provider\-path\fR \fIpath\fR]
[\fB\-propquery\fR \fIpropq\fR]
\&\fImac_name\fR
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The message authentication code functions output the \s-1MAC\s0 of a supplied input
file.
.SH "OPTIONS"
.IX Header "OPTIONS"
.IP "\fB\-help\fR" 4
.IX Item "-help"
Print a usage message.
.IP "\fB\-in\fR \fIfilename\fR" 4
.IX Item "-in filename"
Input filename to calculate a \s-1MAC\s0 for, or standard input by default.
Standard input is used if the filename is '\-'.
Files and standard input are expected to be in binary format.
.IP "\fB\-out\fR \fIfilename\fR" 4
.IX Item "-out filename"
Filename to output to, or standard output by default.
.IP "\fB\-binary\fR" 4
.IX Item "-binary"
Output the \s-1MAC\s0 in binary form. Uses hexadecimal text format if not specified.
.IP "\fB\-cipher\fR \fIname\fR" 4
.IX Item "-cipher name"
Used by \s-1CMAC\s0 and \s-1GMAC\s0 to specify the cipher algorithm.
For \s-1CMAC\s0 it must be one of \s-1AES\-128\-CBC, AES\-192\-CBC, AES\-256\-CBC\s0 or
\&\s-1DES\-EDE3\-CBC.\s0
For \s-1GMAC\s0 it should be a \s-1GCM\s0 mode cipher e.g. \s-1AES\-128\-GCM.\s0
.IP "\fB\-digest\fR \fIname\fR" 4
.IX Item "-digest name"
Used by \s-1HMAC\s0 as an alphanumeric string (use if the key contains printable
characters only).
The string length must conform to any restrictions of the \s-1MAC\s0 algorithm.
To see the list of supported digests, use \f(CW\*(C`openssl list \-digest\-commands\*(C'\fR.
.IP "\fB\-macopt\fR \fInm\fR:\fIv\fR" 4
.IX Item "-macopt nm:v"
Passes options to the \s-1MAC\s0 algorithm.
A comprehensive list of controls can be found in the \s-1EVP_MAC\s0 implementation
documentation.
Common parameter names used by \fBEVP_MAC_CTX_get_params()\fR are:
.RS 4
.IP "\fBkey:\fR\fIstring\fR" 4
.IX Item "key:string"
Specifies the \s-1MAC\s0 key as an alphanumeric string (use if the key contains
printable characters only).
The string length must conform to any restrictions of the \s-1MAC\s0 algorithm.
A key must be specified for every \s-1MAC\s0 algorithm.
.IP "\fBhexkey:\fR\fIstring\fR" 4
.IX Item "hexkey:string"
Specifies the \s-1MAC\s0 key in hexadecimal form (two hex digits per byte).
The key length must conform to any restrictions of the \s-1MAC\s0 algorithm.
A key must be specified for every \s-1MAC\s0 algorithm.
.IP "\fBiv:\fR\fIstring\fR" 4
.IX Item "iv:string"
Used by \s-1GMAC\s0 to specify an \s-1IV\s0 as an alphanumeric string (use if the \s-1IV\s0 contains
printable characters only).
.IP "\fBhexiv:\fR\fIstring\fR" 4
.IX Item "hexiv:string"
Used by \s-1GMAC\s0 to specify an \s-1IV\s0 in hexadecimal form (two hex digits per byte).
.IP "\fBsize:\fR\fIint\fR" 4
.IX Item "size:int"
Used by \s-1KMAC128\s0 or \s-1KMAC256\s0 to specify an output length.
The default sizes are 32 or 64 bytes respectively.
.IP "\fBcustom:\fR\fIstring\fR" 4
.IX Item "custom:string"
Used by \s-1KMAC128\s0 or \s-1KMAC256\s0 to specify a customization string.
The default is the empty string "".
.IP "\fBdigest:\fR\fIstring\fR" 4
.IX Item "digest:string"
This option is identical to the \fB\-digest\fR option.
.IP "\fBcipher:\fR\fIstring\fR" 4
.IX Item "cipher:string"
This option is identical to the \fB\-cipher\fR option.
.RE
.RS 4
.RE
.IP "\fB\-provider\fR \fIname\fR" 4
.IX Item "-provider name"
.PD 0
.IP "\fB\-provider\-path\fR \fIpath\fR" 4
.IX Item "-provider-path path"
.IP "\fB\-propquery\fR \fIpropq\fR" 4
.IX Item "-propquery propq"
.PD
See \*(L"Provider Options\*(R" in \fBopenssl\fR\|(1), \fBprovider\fR\|(7), and \fBproperty\fR\|(7).
.IP "\fImac_name\fR" 4
.IX Item "mac_name"
Specifies the name of a supported \s-1MAC\s0 algorithm which will be used.
To see the list of supported \s-1MAC\s0's use the command \f(CW\*(C`openssl list
\&\-mac\-algorithms\*(C'\fR.
.SH "EXAMPLES"
.IX Header "EXAMPLES"
To create a hex-encoded \s-1HMAC\-SHA1 MAC\s0 of a file and write to stdout:
.PP
.Vb 3
\& openssl mac \-digest SHA1 \e
\&         \-macopt hexkey:000102030405060708090A0B0C0D0E0F10111213 \e
\&         \-in msg.bin HMAC
.Ve
.PP
To create a SipHash \s-1MAC\s0 from a file with a binary file output:
.PP
.Vb 2
\& openssl mac \-macopt hexkey:000102030405060708090A0B0C0D0E0F \e
\&         \-in msg.bin \-out out.bin \-binary SipHash
.Ve
.PP
To create a hex-encoded \s-1CMAC\-AES\-128\-CBC MAC\s0 from a file:
.PP
.Vb 3
\& openssl mac \-cipher AES\-128\-CBC \e
\&         \-macopt hexkey:77A77FAF290C1FA30C683DF16BA7A77B \e
\&         \-in msg.bin CMAC
.Ve
.PP
To create a hex-encoded \s-1KMAC128 MAC\s0 from a file with a Customisation String
\&'Tag' and output length of 16:
.PP
.Vb 2
\& openssl mac \-macopt custom:Tag \-macopt hexkey:40414243444546 \e
\&         \-macopt size:16 \-in msg.bin KMAC128
.Ve
.PP
To create a hex-encoded \s-1GMAC\-AES\-128\-GCM\s0 with a \s-1IV\s0 from a file:
.PP
.Vb 2
\& openssl mac \-cipher AES\-128\-GCM \-macopt hexiv:E0E00F19FED7BA0136A797F3 \e
\&         \-macopt hexkey:77A77FAF290C1FA30C683DF16BA7A77B \-in msg.bin GMAC
.Ve
.SH "NOTES"
.IX Header "NOTES"
The \s-1MAC\s0 mechanisms that are available will depend on the options
used when building OpenSSL.
Use \f(CW\*(C`openssl list \-mac\-algorithms\*(C'\fR to list them.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBopenssl\fR\|(1),
\&\s-1\fBEVP_MAC\s0\fR\|(3),
\&\s-1\fBEVP_MAC\-CMAC\s0\fR\|(7),
\&\s-1\fBEVP_MAC\-GMAC\s0\fR\|(7),
\&\s-1\fBEVP_MAC\-HMAC\s0\fR\|(7),
\&\s-1\fBEVP_MAC\-KMAC\s0\fR\|(7),
\&\fBEVP_MAC\-Siphash\fR\|(7),
\&\fBEVP_MAC\-Poly1305\fR\|(7)
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2018\-2024 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>.