2 {- OpenSSL::safe::output_do_not_edit_headers(); -}
6 openssl-mac - perform Message Authentication Code operations
18 {- $OpenSSL::safe::opt_provider_synopsis -}
23 The message authentication code functions output the MAC of a supplied input
32 Print a usage message.
34 =item B<-in> I<filename>
36 Input filename to calculate a MAC for, or standard input by default.
37 Standard input is used if the filename is '-'.
38 Files are expected to be in binary format, standard input uses hexadecimal text
41 =item B<-out> I<filename>
43 Filename to output to, or standard output by default.
47 Output the MAC in binary form. Uses hexadecimal text format if not specified.
49 =item B<-cipher> I<name>
51 Used by CMAC and GMAC to specify the cipher algorithm.
52 For CMAC it must be one of AES-128-CBC, AES-192-CBC, AES-256-CBC or
54 For GMAC it should be a GCM mode cipher e.g. AES-128-GCM.
56 =item B<-digest> I<name>
58 Used by HMAC as an alphanumeric string (use if the key contains printable
60 The string length must conform to any restrictions of the MAC algorithm.
61 To see the list of supported digests, use C<openssl list -digest-commands>.
63 =item B<-macopt> I<nm>:I<v>
65 Passes options to the MAC algorithm.
66 A comprehensive list of controls can be found in the EVP_MAC implementation
68 Common parameter names used by EVP_MAC_CTX_get_params() are:
72 =item B<key:>I<string>
74 Specifies the MAC key as an alphanumeric string (use if the key contains
75 printable characters only).
76 The string length must conform to any restrictions of the MAC algorithm.
77 A key must be specified for every MAC algorithm.
79 =item B<hexkey:>I<string>
81 Specifies the MAC key in hexadecimal form (two hex digits per byte).
82 The key length must conform to any restrictions of the MAC algorithm.
83 A key must be specified for every MAC algorithm.
87 Used by GMAC to specify an IV as an alphanumeric string (use if the IV contains
88 printable characters only).
90 =item B<hexiv:>I<string>
92 Used by GMAC to specify an IV in hexadecimal form (two hex digits per byte).
96 Used by KMAC128 or KMAC256 to specify an output length.
97 The default sizes are 32 or 64 bytes respectively.
99 =item B<custom:>I<string>
101 Used by KMAC128 or KMAC256 to specify a customization string.
102 The default is the empty string "".
104 =item B<digest:>I<string>
106 This option is identical to the B<-digest> option.
108 =item B<cipher:>I<string>
110 This option is identical to the B<-cipher> option.
114 {- $OpenSSL::safe::opt_provider_item -}
118 Specifies the name of a supported MAC algorithm which will be used.
119 To see the list of supported MAC's use the command C<opensssl list
127 To create a hex-encoded HMAC-SHA1 MAC of a file and write to stdout: \
128 openssl mac -digest SHA1 \
129 -macopt hexkey:000102030405060708090A0B0C0D0E0F10111213 \
132 To create a SipHash MAC from a file with a binary file output: \
133 openssl mac -macopt hexkey:000102030405060708090A0B0C0D0E0F \
134 -in msg.bin -out out.bin -binary SipHash
136 To create a hex-encoded CMAC-AES-128-CBC MAC from a file:\
137 openssl mac -cipher AES-128-CBC \
138 -macopt hexkey:77A77FAF290C1FA30C683DF16BA7A77B \
141 To create a hex-encoded KMAC128 MAC from a file with a Customisation String
142 'Tag' and output length of 16: \
143 openssl mac -macopt custom:Tag -macopt hexkey:40414243444546 \
144 -macopt size:16 -in msg.bin KMAC128
146 To create a hex-encoded GMAC-AES-128-GCM with a IV from a file: \
147 openssl mac -cipher AES-128-GCM -macopt hexiv:E0E00F19FED7BA0136A797F3 \
148 -macopt hexkey:77A77FAF290C1FA30C683DF16BA7A77B -in msg.bin GMAC
152 The MAC mechanisms that are available will depend on the options
153 used when building OpenSSL.
154 Use C<openssl list -mac-algorithms> to list them.
164 L<EVP_MAC-Siphash(7)>,
165 L<EVP_MAC-Poly1305(7)>
169 Copyright 2018-2021 The OpenSSL Project Authors. All Rights Reserved.
171 Licensed under the Apache License 2.0 (the "License"). You may not use
172 this file except in compliance with the License. You can obtain a copy
173 in the file LICENSE in the source distribution or at
174 L<https://www.openssl.org/source/license.html>.