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
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
|
/*
* Copyright 2018 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
* https://www.openssl.org/source/license.html
*/
#include <stdio.h>
#include "internal/cryptlib.h"
#include <openssl/x509.h>
#include <openssl/x509v3.h>
#include <openssl/evp.h>
#include <openssl/cmac.h>
#include "internal/evp_int.h"
/* local CMAC pkey structure */
/* typedef EVP_MAC_IMPL */
struct evp_mac_impl_st {
/* tmpcipher and tmpengine are set to NULL after a CMAC_Init call */
const EVP_CIPHER *tmpcipher; /* cached CMAC cipher */
const ENGINE *tmpengine; /* cached CMAC cipher engine */
CMAC_CTX *ctx;
};
static EVP_MAC_IMPL *cmac_new(void)
{
EVP_MAC_IMPL *cctx;
if ((cctx = OPENSSL_zalloc(sizeof(*cctx))) == NULL
|| (cctx->ctx = CMAC_CTX_new()) == NULL) {
OPENSSL_free(cctx);
cctx = NULL;
}
return cctx;
}
static void cmac_free(EVP_MAC_IMPL *cctx)
{
if (cctx != NULL) {
CMAC_CTX_free(cctx->ctx);
OPENSSL_free(cctx);
}
}
static int cmac_copy(EVP_MAC_IMPL *cdst, EVP_MAC_IMPL *csrc)
{
if (!CMAC_CTX_copy(cdst->ctx, csrc->ctx))
return 0;
cdst->tmpengine = csrc->tmpengine;
cdst->tmpcipher = csrc->tmpcipher;
return 1;
}
static size_t cmac_size(EVP_MAC_IMPL *cctx)
{
return EVP_CIPHER_CTX_block_size(CMAC_CTX_get0_cipher_ctx(cctx->ctx));
}
static int cmac_init(EVP_MAC_IMPL *cctx)
{
int rv = CMAC_Init(cctx->ctx, NULL, 0, cctx->tmpcipher,
(ENGINE *)cctx->tmpengine);
cctx->tmpcipher = NULL;
cctx->tmpengine = NULL;
return rv;
}
static int cmac_update(EVP_MAC_IMPL *cctx, const unsigned char *data,
size_t datalen)
{
return CMAC_Update(cctx->ctx, data, datalen);
}
static int cmac_final(EVP_MAC_IMPL *cctx, unsigned char *out)
{
size_t hlen;
return CMAC_Final(cctx->ctx, out, &hlen);
}
static int cmac_ctrl(EVP_MAC_IMPL *cctx, int cmd, va_list args)
{
switch (cmd) {
case EVP_MAC_CTRL_SET_KEY:
{
const unsigned char *key = va_arg(args, const unsigned char *);
size_t keylen = va_arg(args, size_t);
int rv = CMAC_Init(cctx->ctx, key, keylen, cctx->tmpcipher,
(ENGINE *)cctx->tmpengine);
cctx->tmpcipher = NULL;
cctx->tmpengine = NULL;
return rv;
}
break;
case EVP_MAC_CTRL_SET_CIPHER:
cctx->tmpcipher = va_arg(args, const EVP_CIPHER *);
break;
case EVP_MAC_CTRL_SET_ENGINE:
cctx->tmpengine = va_arg(args, const ENGINE *);
break;
default:
return -2;
}
return 1;
}
static int cmac_ctrl_int(EVP_MAC_IMPL *hctx, int cmd, ...)
{
int rv;
va_list args;
va_start(args, cmd);
rv = cmac_ctrl(hctx, cmd, args);
va_end(args);
return rv;
}
static int cmac_ctrl_str_cb(void *hctx, int cmd, void *buf, size_t buflen)
{
return cmac_ctrl_int(hctx, cmd, buf, buflen);
}
static int cmac_ctrl_str(EVP_MAC_IMPL *cctx, const char *type,
const char *value)
{
if (!value)
return 0;
if (strcmp(type, "cipher") == 0) {
const EVP_CIPHER *c = EVP_get_cipherbyname(value);
if (c == NULL)
return 0;
return cmac_ctrl_int(cctx, EVP_MAC_CTRL_SET_CIPHER, c);
}
if (strcmp(type, "key") == 0)
return EVP_str2ctrl(cmac_ctrl_str_cb, cctx, EVP_MAC_CTRL_SET_KEY,
value);
if (strcmp(type, "hexkey") == 0)
return EVP_hex2ctrl(cmac_ctrl_str_cb, cctx, EVP_MAC_CTRL_SET_KEY,
value);
return -2;
}
const EVP_MAC cmac_meth = {
EVP_MAC_CMAC,
cmac_new,
cmac_copy,
cmac_free,
cmac_size,
cmac_init,
cmac_update,
cmac_final,
cmac_ctrl,
cmac_ctrl_str
};
|
