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
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
|
/*
* Copyright 2019 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 <openssl/crypto.h>
#include <openssl/core_numbers.h>
#include <openssl/core_names.h>
#include <openssl/dsa.h>
#include <openssl/params.h>
#include "internal/provider_algs.h"
static OSSL_OP_signature_newctx_fn dsa_newctx;
static OSSL_OP_signature_sign_init_fn dsa_signature_init;
static OSSL_OP_signature_verify_init_fn dsa_signature_init;
static OSSL_OP_signature_sign_fn dsa_sign;
static OSSL_OP_signature_freectx_fn dsa_freectx;
static OSSL_OP_signature_dupctx_fn dsa_dupctx;
static OSSL_OP_signature_get_ctx_params_fn dsa_get_ctx_params;
static OSSL_OP_signature_gettable_ctx_params_fn dsa_gettable_ctx_params;
static OSSL_OP_signature_set_ctx_params_fn dsa_set_ctx_params;
static OSSL_OP_signature_settable_ctx_params_fn dsa_settable_ctx_params;
/*
* What's passed as an actual key is defined by the KEYMGMT interface.
* We happen to know that our KEYMGMT simply passes DSA structures, so
* we use that here too.
*/
typedef struct {
DSA *dsa;
size_t mdsize;
/* Should be big enough */
char mdname[80];
} PROV_DSA_CTX;
static void *dsa_newctx(void *provctx)
{
return OPENSSL_zalloc(sizeof(PROV_DSA_CTX));
}
static int dsa_signature_init(void *vpdsactx, void *vdsa)
{
PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;
if (pdsactx == NULL || vdsa == NULL || !DSA_up_ref(vdsa))
return 0;
DSA_free(pdsactx->dsa);
pdsactx->dsa = vdsa;
return 1;
}
static int dsa_sign(void *vpdsactx, unsigned char *sig, size_t *siglen,
size_t sigsize, const unsigned char *tbs, size_t tbslen)
{
PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;
int ret;
unsigned int sltmp;
size_t dsasize = DSA_size(pdsactx->dsa);
if (sig == NULL) {
*siglen = dsasize;
return 1;
}
if (sigsize < (size_t)dsasize)
return 0;
if (pdsactx->mdsize != 0 && tbslen != pdsactx->mdsize)
return 0;
ret = DSA_sign(0, tbs, tbslen, sig, &sltmp, pdsactx->dsa);
if (ret <= 0)
return 0;
*siglen = sltmp;
return 1;
}
static int dsa_verify(void *vpdsactx, const unsigned char *sig, size_t siglen,
const unsigned char *tbs, size_t tbslen)
{
PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;
if (pdsactx->mdsize != 0 && tbslen != pdsactx->mdsize)
return 0;
return DSA_verify(0, tbs, tbslen, sig, siglen, pdsactx->dsa);
}
static void dsa_freectx(void *vpdsactx)
{
PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;
DSA_free(pdsactx->dsa);
OPENSSL_free(pdsactx);
}
static void *dsa_dupctx(void *vpdsactx)
{
PROV_DSA_CTX *srcctx = (PROV_DSA_CTX *)vpdsactx;
PROV_DSA_CTX *dstctx;
dstctx = OPENSSL_zalloc(sizeof(*srcctx));
if (dstctx == NULL)
return NULL;
*dstctx = *srcctx;
if (dstctx->dsa != NULL && !DSA_up_ref(dstctx->dsa)) {
OPENSSL_free(dstctx);
return NULL;
}
return dstctx;
}
static int dsa_get_ctx_params(void *vpdsactx, OSSL_PARAM *params)
{
PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;
OSSL_PARAM *p;
if (pdsactx == NULL || params == NULL)
return 0;
p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_DIGEST_SIZE);
if (p != NULL && !OSSL_PARAM_set_size_t(p, pdsactx->mdsize))
return 0;
p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_DIGEST);
if (p != NULL && !OSSL_PARAM_set_utf8_string(p, pdsactx->mdname))
return 0;
return 1;
}
static const OSSL_PARAM known_gettable_ctx_params[] = {
OSSL_PARAM_size_t(OSSL_SIGNATURE_PARAM_DIGEST_SIZE, NULL),
OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_DIGEST, NULL, 0),
OSSL_PARAM_END
};
static const OSSL_PARAM *dsa_gettable_ctx_params(void)
{
return known_gettable_ctx_params;
}
static int dsa_set_ctx_params(void *vpdsactx, const OSSL_PARAM params[])
{
PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;
const OSSL_PARAM *p;
char *mdname;
if (pdsactx == NULL || params == NULL)
return 0;
p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_DIGEST_SIZE);
if (p != NULL && !OSSL_PARAM_get_size_t(p, &pdsactx->mdsize))
return 0;
/*
* We never actually use the mdname, but we do support getting it later.
* This can be useful for applications that want to know the MD that they
* previously set.
*/
p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_DIGEST);
mdname = pdsactx->mdname;
if (p != NULL
&& !OSSL_PARAM_get_utf8_string(p, &mdname, sizeof(pdsactx->mdname)))
return 0;
return 1;
}
static const OSSL_PARAM known_settable_ctx_params[] = {
OSSL_PARAM_size_t(OSSL_SIGNATURE_PARAM_DIGEST_SIZE, NULL),
OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_DIGEST, NULL, 0),
OSSL_PARAM_END
};
static const OSSL_PARAM *dsa_settable_ctx_params(void)
{
return known_settable_ctx_params;
}
const OSSL_DISPATCH dsa_signature_functions[] = {
{ OSSL_FUNC_SIGNATURE_NEWCTX, (void (*)(void))dsa_newctx },
{ OSSL_FUNC_SIGNATURE_SIGN_INIT, (void (*)(void))dsa_signature_init },
{ OSSL_FUNC_SIGNATURE_SIGN, (void (*)(void))dsa_sign },
{ OSSL_FUNC_SIGNATURE_VERIFY_INIT, (void (*)(void))dsa_signature_init },
{ OSSL_FUNC_SIGNATURE_VERIFY, (void (*)(void))dsa_verify },
{ OSSL_FUNC_SIGNATURE_FREECTX, (void (*)(void))dsa_freectx },
{ OSSL_FUNC_SIGNATURE_DUPCTX, (void (*)(void))dsa_dupctx },
{ OSSL_FUNC_SIGNATURE_GET_CTX_PARAMS, (void (*)(void))dsa_get_ctx_params },
{ OSSL_FUNC_SIGNATURE_GETTABLE_CTX_PARAMS,
(void (*)(void))dsa_gettable_ctx_params },
{ OSSL_FUNC_SIGNATURE_SET_CTX_PARAMS, (void (*)(void))dsa_set_ctx_params },
{ OSSL_FUNC_SIGNATURE_SETTABLE_CTX_PARAMS,
(void (*)(void))dsa_settable_ctx_params },
{ 0, NULL }
};
|