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OPENSSL-MAC(1ossl) OpenSSL OPENSSL-MAC(1ossl) NAME openssl-mac - perform Message Authentication Code operations SYNOPSIS openssl mac [-help] [-cipher] [-digest] [-macopt] [-in filename] [-out filename] [-binary] [-provider name] [-provider-path path] [-propquery propq] mac_name DESCRIPTION The message authentication code functions output the MAC of a supplied input file. OPTIONS -help Print 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 must be one of AES-128-CBC, AES-192-CBC, AES-256-CBC or DES-EDE3-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. 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(1), provider(7), and property(7). mac_name Specifies the name of a supported MAC algorithm which will be used. To see the list of supported MAC's 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 GMAC NOTES The MAC mechanisms that are available will depend on the options used when building OpenSSL. Use "openssl list -mac-algorithms" to list them. SEE ALSO openssl(1), EVP_MAC(3), EVP_MAC-CMAC(7), EVP_MAC-GMAC(7), 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>. 3.0.11 2023-09-22 OPENSSL-MAC(1ossl)