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
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
|
/*
* Copyright 2006-2021 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
*/
/*
* DSA low level APIs are deprecated for public use, but still ok for
* internal use.
*/
#include "internal/deprecated.h"
#include <stdio.h>
#include "internal/cryptlib.h"
#include <openssl/asn1t.h>
#include <openssl/x509.h>
#include <openssl/evp.h>
#include <openssl/bn.h>
#include "crypto/evp.h"
#include "dsa_local.h"
/* DSA pkey context structure */
typedef struct {
/* Parameter gen parameters */
int nbits; /* size of p in bits (default: 2048) */
int qbits; /* size of q in bits (default: 224) */
const EVP_MD *pmd; /* MD for parameter generation */
/* Keygen callback info */
int gentmp[2];
/* message digest */
const EVP_MD *md; /* MD for the signature */
} DSA_PKEY_CTX;
static int pkey_dsa_init(EVP_PKEY_CTX *ctx)
{
DSA_PKEY_CTX *dctx = OPENSSL_malloc(sizeof(*dctx));
if (dctx == NULL)
return 0;
dctx->nbits = 2048;
dctx->qbits = 224;
dctx->pmd = NULL;
dctx->md = NULL;
ctx->data = dctx;
ctx->keygen_info = dctx->gentmp;
ctx->keygen_info_count = 2;
return 1;
}
static int pkey_dsa_copy(EVP_PKEY_CTX *dst, const EVP_PKEY_CTX *src)
{
DSA_PKEY_CTX *dctx, *sctx;
if (!pkey_dsa_init(dst))
return 0;
sctx = src->data;
dctx = dst->data;
dctx->nbits = sctx->nbits;
dctx->qbits = sctx->qbits;
dctx->pmd = sctx->pmd;
dctx->md = sctx->md;
return 1;
}
static void pkey_dsa_cleanup(EVP_PKEY_CTX *ctx)
{
DSA_PKEY_CTX *dctx = ctx->data;
OPENSSL_free(dctx);
}
static int pkey_dsa_sign(EVP_PKEY_CTX *ctx, unsigned char *sig,
size_t *siglen, const unsigned char *tbs,
size_t tbslen)
{
int ret;
unsigned int sltmp;
DSA_PKEY_CTX *dctx = ctx->data;
DSA *dsa = ctx->pkey->pkey.dsa;
if (dctx->md != NULL && tbslen != (size_t)EVP_MD_size(dctx->md))
return 0;
ret = DSA_sign(0, tbs, tbslen, sig, &sltmp, dsa);
if (ret <= 0)
return ret;
*siglen = sltmp;
return 1;
}
static int pkey_dsa_verify(EVP_PKEY_CTX *ctx,
const unsigned char *sig, size_t siglen,
const unsigned char *tbs, size_t tbslen)
{
int ret;
DSA_PKEY_CTX *dctx = ctx->data;
DSA *dsa = ctx->pkey->pkey.dsa;
if (dctx->md != NULL && tbslen != (size_t)EVP_MD_size(dctx->md))
return 0;
ret = DSA_verify(0, tbs, tbslen, sig, siglen, dsa);
return ret;
}
static int pkey_dsa_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
{
DSA_PKEY_CTX *dctx = ctx->data;
switch (type) {
case EVP_PKEY_CTRL_DSA_PARAMGEN_BITS:
if (p1 < 256)
return -2;
dctx->nbits = p1;
return 1;
case EVP_PKEY_CTRL_DSA_PARAMGEN_Q_BITS:
if (p1 != 160 && p1 != 224 && p1 && p1 != 256)
return -2;
dctx->qbits = p1;
return 1;
case EVP_PKEY_CTRL_DSA_PARAMGEN_MD:
if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1 &&
EVP_MD_type((const EVP_MD *)p2) != NID_sha224 &&
EVP_MD_type((const EVP_MD *)p2) != NID_sha256) {
ERR_raise(ERR_LIB_DSA, DSA_R_INVALID_DIGEST_TYPE);
return 0;
}
dctx->pmd = p2;
return 1;
case EVP_PKEY_CTRL_MD:
if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1 &&
EVP_MD_type((const EVP_MD *)p2) != NID_dsa &&
EVP_MD_type((const EVP_MD *)p2) != NID_dsaWithSHA &&
EVP_MD_type((const EVP_MD *)p2) != NID_sha224 &&
EVP_MD_type((const EVP_MD *)p2) != NID_sha256 &&
EVP_MD_type((const EVP_MD *)p2) != NID_sha384 &&
EVP_MD_type((const EVP_MD *)p2) != NID_sha512 &&
EVP_MD_type((const EVP_MD *)p2) != NID_sha3_224 &&
EVP_MD_type((const EVP_MD *)p2) != NID_sha3_256 &&
EVP_MD_type((const EVP_MD *)p2) != NID_sha3_384 &&
EVP_MD_type((const EVP_MD *)p2) != NID_sha3_512) {
ERR_raise(ERR_LIB_DSA, DSA_R_INVALID_DIGEST_TYPE);
return 0;
}
dctx->md = p2;
return 1;
case EVP_PKEY_CTRL_GET_MD:
*(const EVP_MD **)p2 = dctx->md;
return 1;
case EVP_PKEY_CTRL_DIGESTINIT:
case EVP_PKEY_CTRL_PKCS7_SIGN:
case EVP_PKEY_CTRL_CMS_SIGN:
return 1;
case EVP_PKEY_CTRL_PEER_KEY:
ERR_raise(ERR_LIB_DSA, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
return -2;
default:
return -2;
}
}
static int pkey_dsa_ctrl_str(EVP_PKEY_CTX *ctx,
const char *type, const char *value)
{
if (strcmp(type, "dsa_paramgen_bits") == 0) {
int nbits;
nbits = atoi(value);
return EVP_PKEY_CTX_set_dsa_paramgen_bits(ctx, nbits);
}
if (strcmp(type, "dsa_paramgen_q_bits") == 0) {
int qbits = atoi(value);
return EVP_PKEY_CTX_set_dsa_paramgen_q_bits(ctx, qbits);
}
if (strcmp(type, "dsa_paramgen_md") == 0) {
const EVP_MD *md = EVP_get_digestbyname(value);
if (md == NULL) {
ERR_raise(ERR_LIB_DSA, DSA_R_INVALID_DIGEST_TYPE);
return 0;
}
return EVP_PKEY_CTX_set_dsa_paramgen_md(ctx, md);
}
return -2;
}
static int pkey_dsa_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
{
DSA *dsa = NULL;
DSA_PKEY_CTX *dctx = ctx->data;
BN_GENCB *pcb;
int ret, res;
if (ctx->pkey_gencb) {
pcb = BN_GENCB_new();
if (pcb == NULL)
return 0;
evp_pkey_set_cb_translate(pcb, ctx);
} else
pcb = NULL;
dsa = DSA_new();
if (dsa == NULL) {
BN_GENCB_free(pcb);
return 0;
}
if (dctx->md != NULL)
ossl_ffc_set_digest(&dsa->params, EVP_MD_name(dctx->md), NULL);
ret = ossl_ffc_params_FIPS186_4_generate(NULL, &dsa->params,
FFC_PARAM_TYPE_DSA, dctx->nbits,
dctx->qbits, &res, pcb);
BN_GENCB_free(pcb);
if (ret > 0)
EVP_PKEY_assign_DSA(pkey, dsa);
else
DSA_free(dsa);
return ret;
}
static int pkey_dsa_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
{
DSA *dsa = NULL;
if (ctx->pkey == NULL) {
ERR_raise(ERR_LIB_DSA, DSA_R_NO_PARAMETERS_SET);
return 0;
}
dsa = DSA_new();
if (dsa == NULL)
return 0;
EVP_PKEY_assign_DSA(pkey, dsa);
/* Note: if error return, pkey is freed by parent routine */
if (!EVP_PKEY_copy_parameters(pkey, ctx->pkey))
return 0;
return DSA_generate_key(pkey->pkey.dsa);
}
static const EVP_PKEY_METHOD dsa_pkey_meth = {
EVP_PKEY_DSA,
EVP_PKEY_FLAG_AUTOARGLEN,
pkey_dsa_init,
pkey_dsa_copy,
pkey_dsa_cleanup,
0,
pkey_dsa_paramgen,
0,
pkey_dsa_keygen,
0,
pkey_dsa_sign,
0,
pkey_dsa_verify,
0, 0,
0, 0, 0, 0,
0, 0,
0, 0,
0, 0,
pkey_dsa_ctrl,
pkey_dsa_ctrl_str
};
const EVP_PKEY_METHOD *ossl_dsa_pkey_method(void)
{
return &dsa_pkey_meth;
}
|
