1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
|
=pod
=head1 NAME
EVP_MAC-KMAC, EVP_MAC-KMAC128, EVP_MAC-KMAC256
- The KMAC EVP_MAC implementations
=head1 DESCRIPTION
Support for computing KMAC MACs through the B<EVP_MAC> API.
=head2 Identity
These implementations are identified with one of these names and
properties, to be used with EVP_MAC_fetch():
=over 4
=item "KMAC-128", "provider=default" or "provider=fips"
=item "KMAC-256", "provider=default" or "provider=fips"
=back
=head2 Supported parameters
The general description of these parameters can be found in
L<EVP_MAC(3)/PARAMETERS>.
All these parameters can be set with EVP_MAC_CTX_set_params().
Furthermore, the "size" parameter can be retrieved with
EVP_MAC_CTX_get_params(), or with EVP_MAC_CTX_get_mac_size().
The length of the "size" parameter should not exceed that of a B<size_t>.
=over 4
=item "key" (B<OSSL_MAC_PARAM_KEY>) <octet string>
=item "custom" (B<OSSL_MAC_PARAM_CUSTOM>) <octet string>
=item "size" (B<OSSL_MAC_PARAM_SIZE>) <unsigned integer>
=item "xof" (B<OSSL_MAC_PARAM_XOF>) <integer>
The "xof" parameter value is expected to be 1 or 0. Use 1 to enable XOF mode.
The default value is 0.
=back
The "custom" and "key" parameters must be set before EVP_MAC_init().
The "xof" and "size" parameters can be set at any time before EVP_MAC_final().
=head1 EXAMPLES
#include <openssl/evp.h>
#include <openssl/params.h>
static int do_kmac(const unsigned char *in, size_t in_len,
const unsigned char *key, size_t key_len,
const unsigned char *custom, size_t custom_len,
int xof_enabled, unsigned char *out, int out_len)
{
EVP_MAC_CTX *ctx = NULL;
EVP_MAC *mac = NULL;
OSSL_PARAM params[4], *p;
int ret = 0;
size_t l = 0;
mac = EVP_MAC_fetch(NULL, "KMAC-128", NULL);
if (mac == NULL)
goto err;
ctx = EVP_MAC_CTX_new(mac);
/* The mac can be freed after it is used by EVP_MAC_CTX_new */
EVP_MAC_free(mac);
if (ctx == NULL)
goto err;
/*
* Setup parameters required before calling EVP_MAC_init()
* The parameters OSSL_MAC_PARAM_XOF and OSSL_MAC_PARAM_SIZE may also be
* used at this point.
*/
p = params;
*p++ = OSSL_PARAM_construct_octet_string(OSSL_MAC_PARAM_KEY,
(void *)key, key_len);
if (custom != NULL && custom_len != 0)
*p++ = OSSL_PARAM_construct_octet_string(OSSL_MAC_PARAM_CUSTOM,
(void *)custom, custom_len);
*p = OSSL_PARAM_construct_end();
if (!EVP_MAC_CTX_set_params(ctx, params))
goto err;
if (!EVP_MAC_init(ctx))
goto err;
/*
* Note: the following optional parameters can be set any time
* before EVP_MAC_final().
*/
p = params;
*p++ = OSSL_PARAM_construct_int(OSSL_MAC_PARAM_XOF, &xof_enabled);
*p++ = OSSL_PARAM_construct_int(OSSL_MAC_PARAM_SIZE, &out_len);
*p = OSSL_PARAM_construct_end();
if (!EVP_MAC_CTX_set_params(ctx, params))
goto err;
/* The update may be called multiple times here for streamed input */
if (!EVP_MAC_update(ctx, in, in_len))
goto err;
if (!EVP_MAC_final(ctx, out, &l, out_len))
goto err;
ret = 1;
err:
EVP_MAC_CTX_free(ctx);
return ret;
}
=head1 SEE ALSO
L<EVP_MAC_CTX_get_params(3)>, L<EVP_MAC_CTX_set_params(3)>,
L<EVP_MAC(3)/PARAMETERS>, L<OSSL_PARAM(3)>
=head1 COPYRIGHT
Copyright 2018-2020 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the Apache License 2.0 (the "License"). You may not use
this file except in compliance with the License. You can obtain a copy
in the file LICENSE in the source distribution or at
L<https://www.openssl.org/source/license.html>.
=cut
|
