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Title "OPENSSL-MAC 1ossl" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
openssl-mac - perform Message Authentication Code operations Header "SYNOPSIS" \fBopenssl mac [-help] [-cipher] [-digest] [-macopt] [-in filename] [-out filename] [-binary] [-provider name] [-provider-path path] [-propquery propq] \fImac_name Header "DESCRIPTION" The message authentication code functions output the \s-1MAC\s0 of a supplied input file. Header "OPTIONS" Item "-help" Print a usage message. 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. Item "-out filename" Filename to output to, or standard output by default. Item "-binary" Output the \s-1MAC\s0 in binary form. Uses hexadecimal text format if not specified. 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 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 \*(C`openssl list -digest-commands\*(C'. 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 EVP_MAC_CTX_get_params() are: Item "-provider name"

0

Item "-provider-path path" Item "-propquery propq"

See \*(L"Provider Options\*(R" in openssl\|(1), provider\|(7), and property\|(7).

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 \*(C`openssl list \-mac-algorithms\*(C'. 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

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

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

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

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

Header "NOTES" The \s-1MAC\s0 mechanisms that are available will depend on the options used when building OpenSSL. Use \*(C`openssl list -mac-algorithms\*(C' to list them. Header "SEE ALSO" \fBopenssl\|(1), \s-1EVP_MAC\s0\|(3), \s-1EVP_MAC-CMAC\s0\|(7), \s-1EVP_MAC-GMAC\s0\|(7), \s-1EVP_MAC-HMAC\s0\|(7), \s-1EVP_MAC-KMAC\s0\|(7), \fBEVP_MAC-Siphash\|(7), \fBEVP_MAC-Poly1305\|(7) Header "COPYRIGHT" Copyright 2018-2022 The OpenSSL Project Authors. All Rights Reserved.

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>.