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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 should be a \s-1CBC\s0 mode cipher e.g. \s-1AES\-128\-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 \fIEVP_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 \fIopenssl\fR\|(1), \fIprovider\fR\|(7), and \fIproperty\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: \e openssl mac \-digest \s-1SHA1\s0 \e \-macopt hexkey:000102030405060708090A0B0C0D0E0F10111213 \e \-in msg.bin \s-1HMAC\s0 .PP To create a SipHash \s-1MAC\s0 from a file with a binary file output: \e openssl mac \-macopt hexkey:000102030405060708090A0B0C0D0E0F \e \-in msg.bin \-out out.bin \-binary SipHash .PP To create a hex-encoded \s-1CMAC\-AES\-128\-CBC MAC\s0 from a file:\e openssl mac \-cipher \s-1AES\-128\-CBC\s0 \e \-macopt hexkey:77A77FAF290C1FA30C683DF16BA7A77B \e \-in msg.bin \s-1CMAC\s0 .PP To create a hex-encoded \s-1KMAC128 MAC\s0 from a file with a Customisation String \&'Tag' and output length of 16: \e openssl mac \-macopt custom:Tag \-macopt hexkey:40414243444546 \e \-macopt size:16 \-in msg.bin \s-1KMAC128\s0 .PP To create a hex-encoded \s-1GMAC\-AES\-128\-GCM\s0 with a \s-1IV\s0 from a file: \e openssl mac \-cipher \s-1AES\-128\-GCM\s0 \-macopt hexiv:E0E00F19FED7BA0136A797F3 \e \-macopt hexkey:77A77FAF290C1FA30C683DF16BA7A77B \-in msg.bin \s-1GMAC\s0 .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" \&\fIopenssl\fR\|(1), \&\s-1\fIEVP_MAC\s0\fR\|(3), \&\s-1\fIEVP_MAC\-CMAC\s0\fR\|(7), \&\s-1\fIEVP_MAC\-GMAC\s0\fR\|(7), \&\s-1\fIEVP_MAC\-HMAC\s0\fR\|(7), \&\s-1\fIEVP_MAC\-KMAC\s0\fR\|(7), \&\fIEVP_MAC\-Siphash\fR\|(7), \&\fIEVP_MAC\-Poly1305\fR\|(7) .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2018\-2023 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 .