openssl mac

Perform Message Authentication Code operations 

openssl command

SYNOPSIS

openssl mac [-help] [-cipher] [-digest] [-macopt] [-in filename] [-out filename] [-binary] [-provider name] [-provider-path path] [-propquery propq] [mac_name]

DESCRIPTION

This command is used to print out version information about OpenSSL.

Options

-help 

Print out a usage message.

-in filename 

Input filename to calculate a MAC 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.

-out filename 

Filename to output to, or standard output by default.

-binary 

Output the MAC in binary form. Uses hexadecimal text format if not specified.

-cipher name 

Used by CMAC and GMAC to specify the cipher algorithm. For CMAC it should be a CBC mode cipher e.g. AES-128-CBC. For GMAC it should be a GCM mode cipher e.g. AES-128-GCM.

-digest name 

Used by HMAC as an alphanumeric string (use if the key contains printable characters only). The string length must conform to any restrictions of the MAC algorithm. To see the list of supported digests, use openssl list -digest-commands.

-macopt nm:v 

Passes options to the MAC algorithm. A comprehensive list of controls can be found in the EVP_MAC implementation documentation. Common parameter names used by EVP_MAC_CTX_get_params() are:

key:string 

Specifies the MAC key as an alphanumeric string (use if the key contains printable characters only). The string length must conform to any restrictions of the MAC algorithm. A key must be specified for every MAC algorithm.

hexkey:string 

Specifies the MAC key in hexadecimal form (two hex digits per byte). The key length must conform to any restrictions of the MAC algorithm. A key must be specified for every MAC algorithm.

iv:string 

Used by GMAC to specify an IV as an alphanumeric string (use if the IV contains printable characters only).

hexiv:string 

Used by GMAC to specify an IV in hexadecimal form (two hex digits per byte).

size:int 

Used by KMAC128 or KMAC256 to specify an output length. The default sizes are 32 or 64 bytes respectively.

custom:string 

Used by KMAC128 or KMAC256 to specify a customization string. The default is the empty string "".

digest:string 

This option is identical to the -digest option.

cipher:string 

This option is identical to the -cipher option.

-provider name 
-provider-path path 
-propquery propq 

See Provider Options in openssl for details.

mac_name 

Specifies the name of a supported MAC algorithm which will be used. To see the list of supported MACs, use the command openssl list -mac-algorithms.

EXAMPLES

To create a hex-encoded HMAC-SHA1 MAC of a file and write to stdout: 

        openssl mac -digest SHA1 \
                -macopt hexkey:000102030405060708090A0B0C0D0E0F10111213 \
                -in msg.bin HMAC

To create a SipHash MAC from a file with a binary file output: 

        openssl mac -macopt hexkey:000102030405060708090A0B0C0D0E0F \
                -in msg.bin -out out.bin -binary SipHash

To create a hex-encoded CMAC-AES-128-CBC MAC from a file: 

        openssl mac -cipher AES-128-CBC \
                -macopt hexkey:77A77FAF290C1FA30C683DF16BA7A77B \
                -in msg.bin CMAC

To create a hex-encoded KMAC128 MAC from a file with a Customisation String 'Tag' and output length of 16: 

        openssl mac -macopt custom:Tag -macopt hexkey:40414243444546 \
                -macopt size:16 -in msg.bin KMAC128

To create a hex-encoded GMAC-AES-128-GCM with a IV from a file: 

        openssl mac -cipher AES-128-GCM -macopt hexiv:E0E00F19FED7BA0136A797F3
       \
                -macopt hexkey:77A77FAF290C1FA30C683DF16BA7A77B -in msg.bin

NOTES

The MAC mechanisms that are available will depend on the options used when building OpenSSL. Use openssl list -mac-algorithms to list them.

COPYRIGHT

Copyright 2000-2023 The OpenSSL Project Authors. All Rights Reserved.

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 here: OpenSSL.

AVAILABILITY

PTC MKS Toolkit for System Administrators
PTC MKS Toolkit for Developers
PTC MKS Toolkit for Interoperability
PTC MKS Toolkit for Professional Developers
PTC MKS Toolkit for Professional Developers 64-Bit Edition
PTC MKS Toolkit for Enterprise Developers
PTC MKS Toolkit for Enterprise Developers 64-Bit Edition

PTC MKS Toolkit 10.5 Documentation Build 40.