| 1 | =pod
|
|---|
| 2 |
|
|---|
| 3 | =head1 NAME
|
|---|
| 4 |
|
|---|
| 5 | EVP_MAC-CMAC - The CMAC EVP_MAC implementation
|
|---|
| 6 |
|
|---|
| 7 | =head1 DESCRIPTION
|
|---|
| 8 |
|
|---|
| 9 | Support for computing CMAC MACs through the B<EVP_MAC> API.
|
|---|
| 10 |
|
|---|
| 11 | This implementation uses EVP_CIPHER functions to get access to the underlying
|
|---|
| 12 | cipher.
|
|---|
| 13 |
|
|---|
| 14 | =head2 Identity
|
|---|
| 15 |
|
|---|
| 16 | This implementation is identified with this name and properties, to be
|
|---|
| 17 | used with EVP_MAC_fetch():
|
|---|
| 18 |
|
|---|
| 19 | =over 4
|
|---|
| 20 |
|
|---|
| 21 | =item "CMAC", "provider=default" or "provider=fips"
|
|---|
| 22 |
|
|---|
| 23 | =back
|
|---|
| 24 |
|
|---|
| 25 | =head2 Supported parameters
|
|---|
| 26 |
|
|---|
| 27 | The general description of these parameters can be found in
|
|---|
| 28 | L<EVP_MAC(3)/PARAMETERS>.
|
|---|
| 29 |
|
|---|
| 30 | The following parameter can be set with EVP_MAC_CTX_set_params():
|
|---|
| 31 |
|
|---|
| 32 | =over 4
|
|---|
| 33 |
|
|---|
| 34 | =item "key" (B<OSSL_MAC_PARAM_KEY>) <octet string>
|
|---|
| 35 |
|
|---|
| 36 | Sets the MAC key.
|
|---|
| 37 | Setting this parameter is identical to passing a I<key> to L<EVP_MAC_init(3)>.
|
|---|
| 38 |
|
|---|
| 39 | =item "cipher" (B<OSSL_MAC_PARAM_CIPHER>) <UTF8 string>
|
|---|
| 40 |
|
|---|
| 41 | Sets the name of the underlying cipher to be used. The mode of the cipher
|
|---|
| 42 | must be CBC.
|
|---|
| 43 |
|
|---|
| 44 | =item "properties" (B<OSSL_MAC_PARAM_PROPERTIES>) <UTF8 string>
|
|---|
| 45 |
|
|---|
| 46 | Sets the properties to be queried when trying to fetch the underlying cipher.
|
|---|
| 47 | This must be given together with the cipher naming parameter to be considered
|
|---|
| 48 | valid.
|
|---|
| 49 |
|
|---|
| 50 | =back
|
|---|
| 51 |
|
|---|
| 52 | The following parameters can be retrieved with
|
|---|
| 53 | EVP_MAC_CTX_get_params():
|
|---|
| 54 |
|
|---|
| 55 | =over 4
|
|---|
| 56 |
|
|---|
| 57 | =item "size" (B<OSSL_MAC_PARAM_SIZE>) <unsigned integer>
|
|---|
| 58 |
|
|---|
| 59 | The "size" parameter can also be retrieved with with EVP_MAC_CTX_get_mac_size().
|
|---|
| 60 | The length of the "size" parameter is equal to that of an B<unsigned int>.
|
|---|
| 61 |
|
|---|
| 62 | =back
|
|---|
| 63 |
|
|---|
| 64 | =over 4
|
|---|
| 65 |
|
|---|
| 66 | =item "block-size" (B<OSSL_MAC_PARAM_BLOCK_SIZE>) <unsigned integer>
|
|---|
| 67 |
|
|---|
| 68 | Gets the MAC block size. The "block-size" parameter can also be retrieved with
|
|---|
| 69 | EVP_MAC_CTX_get_block_size().
|
|---|
| 70 |
|
|---|
| 71 | =back
|
|---|
| 72 |
|
|---|
| 73 | =head1 SEE ALSO
|
|---|
| 74 |
|
|---|
| 75 | L<EVP_MAC_CTX_get_params(3)>, L<EVP_MAC_CTX_set_params(3)>,
|
|---|
| 76 | L<EVP_MAC(3)/PARAMETERS>, L<OSSL_PARAM(3)>
|
|---|
| 77 |
|
|---|
| 78 | =head1 COPYRIGHT
|
|---|
| 79 |
|
|---|
| 80 | Copyright 2018-2022 The OpenSSL Project Authors. All Rights Reserved.
|
|---|
| 81 |
|
|---|
| 82 | Licensed under the Apache License 2.0 (the "License"). You may not use
|
|---|
| 83 | this file except in compliance with the License. You can obtain a copy
|
|---|
| 84 | in the file LICENSE in the source distribution or at
|
|---|
| 85 | L<https://www.openssl.org/source/license.html>.
|
|---|
| 86 |
|
|---|
| 87 | =cut
|
|---|
