mirror of
https://github.com/openssl/openssl.git
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175 lines
4.5 KiB
Plaintext
175 lines
4.5 KiB
Plaintext
=pod
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{- OpenSSL::safe::output_do_not_edit_headers(); -}
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=head1 NAME
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openssl-mac - perform Message Authentication Code operations
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=head1 SYNOPSIS
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B<openssl mac>
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[B<-help>]
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[B<-cipher>]
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[B<-digest>]
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[B<-macopt>]
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[B<-in> I<filename>]
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[B<-out> I<filename>]
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[B<-binary>]
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{- $OpenSSL::safe::opt_provider_synopsis -}
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I<mac_name>
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=head1 DESCRIPTION
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The message authentication code functions output the MAC of a supplied input
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file.
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=head1 OPTIONS
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=over 4
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=item B<-help>
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Print a usage message.
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=item B<-in> I<filename>
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Input filename to calculate a MAC for, or standard input by default.
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Standard input is used if the filename is '-'.
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Files and standard input are expected to be in binary format.
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=item B<-out> I<filename>
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Filename to output to, or standard output by default.
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=item B<-binary>
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Output the MAC in binary form. Uses hexadecimal text format if not specified.
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=item B<-cipher> I<name>
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Used by CMAC and GMAC to specify the cipher algorithm.
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For CMAC it should be a CBC mode cipher e.g. AES-128-CBC.
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For GMAC it should be a GCM mode cipher e.g. AES-128-GCM.
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=item B<-digest> I<name>
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Used by HMAC as an alphanumeric string (use if the key contains printable
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characters only).
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The string length must conform to any restrictions of the MAC algorithm.
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To see the list of supported digests, use C<openssl list -digest-commands>.
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=item B<-macopt> I<nm>:I<v>
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Passes options to the MAC algorithm.
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A comprehensive list of controls can be found in the EVP_MAC implementation
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documentation.
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Common parameter names used by EVP_MAC_CTX_get_params() are:
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=over 4
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=item B<key:>I<string>
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Specifies the MAC key as an alphanumeric string (use if the key contains
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printable characters only).
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The string length must conform to any restrictions of the MAC algorithm.
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A key must be specified for every MAC algorithm.
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=item B<hexkey:>I<string>
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Specifies the MAC key in hexadecimal form (two hex digits per byte).
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The key length must conform to any restrictions of the MAC algorithm.
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A key must be specified for every MAC algorithm.
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=item B<iv:>I<string>
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Used by GMAC to specify an IV as an alphanumeric string (use if the IV contains
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printable characters only).
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=item B<hexiv:>I<string>
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Used by GMAC to specify an IV in hexadecimal form (two hex digits per byte).
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=item B<size:>I<int>
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Used by KMAC128 or KMAC256 to specify an output length.
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The default sizes are 32 or 64 bytes respectively.
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=item B<custom:>I<string>
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Used by KMAC128 or KMAC256 to specify a customization string.
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The default is the empty string "".
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=item B<digest:>I<string>
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This option is identical to the B<-digest> option.
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=item B<cipher:>I<string>
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This option is identical to the B<-cipher> option.
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=back
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{- $OpenSSL::safe::opt_provider_item -}
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=item I<mac_name>
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Specifies the name of a supported MAC algorithm which will be used.
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To see the list of supported MAC's use the command C<openssl list
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-mac-algorithms>.
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=back
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=head1 EXAMPLES
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To create a hex-encoded HMAC-SHA1 MAC of a file and write to stdout: \
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openssl mac -digest SHA1 \
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-macopt hexkey:000102030405060708090A0B0C0D0E0F10111213 \
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-in msg.bin HMAC
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To create a SipHash MAC from a file with a binary file output: \
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openssl mac -macopt hexkey:000102030405060708090A0B0C0D0E0F \
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-in msg.bin -out out.bin -binary SipHash
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To create a hex-encoded CMAC-AES-128-CBC MAC from a file:\
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openssl mac -cipher AES-128-CBC \
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-macopt hexkey:77A77FAF290C1FA30C683DF16BA7A77B \
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-in msg.bin CMAC
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To create a hex-encoded KMAC128 MAC from a file with a Customisation String
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'Tag' and output length of 16: \
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openssl mac -macopt custom:Tag -macopt hexkey:40414243444546 \
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-macopt size:16 -in msg.bin KMAC128
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To create a hex-encoded GMAC-AES-128-GCM with a IV from a file: \
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openssl mac -cipher AES-128-GCM -macopt hexiv:E0E00F19FED7BA0136A797F3 \
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-macopt hexkey:77A77FAF290C1FA30C683DF16BA7A77B -in msg.bin GMAC
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=head1 NOTES
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The MAC mechanisms that are available will depend on the options
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used when building OpenSSL.
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Use C<openssl list -mac-algorithms> to list them.
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=head1 SEE ALSO
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L<openssl(1)>,
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L<EVP_MAC(3)>,
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L<EVP_MAC-CMAC(7)>,
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L<EVP_MAC-GMAC(7)>,
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L<EVP_MAC-HMAC(7)>,
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L<EVP_MAC-KMAC(7)>,
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L<EVP_MAC-Siphash(7)>,
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L<EVP_MAC-Poly1305(7)>
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=head1 COPYRIGHT
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Copyright 2018-2023 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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