1 /*
2 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
3 * 2006.
4 */
5 /* ====================================================================
6 * Copyright (c) 2006-2019 The OpenSSL Project. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in
17 * the documentation and/or other materials provided with the
18 * distribution.
19 *
20 * 3. All advertising materials mentioning features or use of this
21 * software must display the following acknowledgment:
22 * "This product includes software developed by the OpenSSL Project
23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
24 *
25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26 * endorse or promote products derived from this software without
27 * prior written permission. For written permission, please contact
28 * licensing@OpenSSL.org.
29 *
30 * 5. Products derived from this software may not be called "OpenSSL"
31 * nor may "OpenSSL" appear in their names without prior written
32 * permission of the OpenSSL Project.
33 *
34 * 6. Redistributions of any form whatsoever must retain the following
35 * acknowledgment:
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
38 *
39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50 * OF THE POSSIBILITY OF SUCH DAMAGE.
51 * ====================================================================
52 *
53 * This product includes cryptographic software written by Eric Young
54 * (eay@cryptsoft.com). This product includes software written by Tim
55 * Hudson (tjh@cryptsoft.com).
56 *
57 */
58
59 #include <stdio.h>
60 #include "cryptlib.h"
61 #include <openssl/asn1t.h>
62 #include <openssl/x509.h>
63 #include <openssl/evp.h>
64 #include <openssl/bn.h>
65 #include "evp_locl.h"
66 #include "dsa_locl.h"
67
68 /* DSA pkey context structure */
69
70 typedef struct {
71 /* Parameter gen parameters */
72 int nbits; /* size of p in bits (default: 2048) */
73 int qbits; /* size of q in bits (default: 224) */
74 const EVP_MD *pmd; /* MD for parameter generation */
75 /* Keygen callback info */
76 int gentmp[2];
77 /* message digest */
78 const EVP_MD *md; /* MD for the signature */
79 } DSA_PKEY_CTX;
80
pkey_dsa_init(EVP_PKEY_CTX * ctx)81 static int pkey_dsa_init(EVP_PKEY_CTX *ctx)
82 {
83 DSA_PKEY_CTX *dctx;
84 dctx = OPENSSL_malloc(sizeof(DSA_PKEY_CTX));
85 if (!dctx)
86 return 0;
87 dctx->nbits = 2048;
88 dctx->qbits = 224;
89 dctx->pmd = NULL;
90 dctx->md = NULL;
91
92 ctx->data = dctx;
93 ctx->keygen_info = dctx->gentmp;
94 ctx->keygen_info_count = 2;
95
96 return 1;
97 }
98
pkey_dsa_copy(EVP_PKEY_CTX * dst,EVP_PKEY_CTX * src)99 static int pkey_dsa_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
100 {
101 DSA_PKEY_CTX *dctx, *sctx;
102 if (!pkey_dsa_init(dst))
103 return 0;
104 sctx = src->data;
105 dctx = dst->data;
106 dctx->nbits = sctx->nbits;
107 dctx->qbits = sctx->qbits;
108 dctx->pmd = sctx->pmd;
109 dctx->md = sctx->md;
110 return 1;
111 }
112
pkey_dsa_cleanup(EVP_PKEY_CTX * ctx)113 static void pkey_dsa_cleanup(EVP_PKEY_CTX *ctx)
114 {
115 DSA_PKEY_CTX *dctx = ctx->data;
116 if (dctx)
117 OPENSSL_free(dctx);
118 }
119
pkey_dsa_sign(EVP_PKEY_CTX * ctx,unsigned char * sig,size_t * siglen,const unsigned char * tbs,size_t tbslen)120 static int pkey_dsa_sign(EVP_PKEY_CTX *ctx, unsigned char *sig,
121 size_t *siglen, const unsigned char *tbs,
122 size_t tbslen)
123 {
124 int ret, type;
125 unsigned int sltmp;
126 DSA_PKEY_CTX *dctx = ctx->data;
127 DSA *dsa = ctx->pkey->pkey.dsa;
128
129 if (dctx->md)
130 type = EVP_MD_type(dctx->md);
131 else
132 type = NID_sha1;
133
134 ret = DSA_sign(type, tbs, tbslen, sig, &sltmp, dsa);
135
136 if (ret <= 0)
137 return ret;
138 *siglen = sltmp;
139 return 1;
140 }
141
pkey_dsa_verify(EVP_PKEY_CTX * ctx,const unsigned char * sig,size_t siglen,const unsigned char * tbs,size_t tbslen)142 static int pkey_dsa_verify(EVP_PKEY_CTX *ctx,
143 const unsigned char *sig, size_t siglen,
144 const unsigned char *tbs, size_t tbslen)
145 {
146 int ret, type;
147 DSA_PKEY_CTX *dctx = ctx->data;
148 DSA *dsa = ctx->pkey->pkey.dsa;
149
150 if (dctx->md)
151 type = EVP_MD_type(dctx->md);
152 else
153 type = NID_sha1;
154
155 ret = DSA_verify(type, tbs, tbslen, sig, siglen, dsa);
156
157 return ret;
158 }
159
pkey_dsa_ctrl(EVP_PKEY_CTX * ctx,int type,int p1,void * p2)160 static int pkey_dsa_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
161 {
162 DSA_PKEY_CTX *dctx = ctx->data;
163 switch (type) {
164 case EVP_PKEY_CTRL_DSA_PARAMGEN_BITS:
165 if (p1 < 256)
166 return -2;
167 dctx->nbits = p1;
168 return 1;
169
170 case EVP_PKEY_CTRL_DSA_PARAMGEN_Q_BITS:
171 if (p1 != 160 && p1 != 224 && p1 && p1 != 256)
172 return -2;
173 dctx->qbits = p1;
174 return 1;
175
176 case EVP_PKEY_CTRL_DSA_PARAMGEN_MD:
177 if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1 &&
178 EVP_MD_type((const EVP_MD *)p2) != NID_sha224 &&
179 EVP_MD_type((const EVP_MD *)p2) != NID_sha256) {
180 DSAerr(DSA_F_PKEY_DSA_CTRL, DSA_R_INVALID_DIGEST_TYPE);
181 return 0;
182 }
183 dctx->pmd = p2;
184 return 1;
185
186 case EVP_PKEY_CTRL_MD:
187 if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1 &&
188 EVP_MD_type((const EVP_MD *)p2) != NID_dsa &&
189 EVP_MD_type((const EVP_MD *)p2) != NID_dsaWithSHA &&
190 EVP_MD_type((const EVP_MD *)p2) != NID_sha224 &&
191 EVP_MD_type((const EVP_MD *)p2) != NID_sha256 &&
192 EVP_MD_type((const EVP_MD *)p2) != NID_sha384 &&
193 EVP_MD_type((const EVP_MD *)p2) != NID_sha512) {
194 DSAerr(DSA_F_PKEY_DSA_CTRL, DSA_R_INVALID_DIGEST_TYPE);
195 return 0;
196 }
197 dctx->md = p2;
198 return 1;
199
200 case EVP_PKEY_CTRL_GET_MD:
201 *(const EVP_MD **)p2 = dctx->md;
202 return 1;
203
204 case EVP_PKEY_CTRL_DIGESTINIT:
205 case EVP_PKEY_CTRL_PKCS7_SIGN:
206 case EVP_PKEY_CTRL_CMS_SIGN:
207 return 1;
208
209 case EVP_PKEY_CTRL_PEER_KEY:
210 DSAerr(DSA_F_PKEY_DSA_CTRL,
211 EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
212 return -2;
213 default:
214 return -2;
215
216 }
217 }
218
pkey_dsa_ctrl_str(EVP_PKEY_CTX * ctx,const char * type,const char * value)219 static int pkey_dsa_ctrl_str(EVP_PKEY_CTX *ctx,
220 const char *type, const char *value)
221 {
222 if (!strcmp(type, "dsa_paramgen_bits")) {
223 int nbits;
224 nbits = atoi(value);
225 return EVP_PKEY_CTX_set_dsa_paramgen_bits(ctx, nbits);
226 }
227 if (!strcmp(type, "dsa_paramgen_q_bits")) {
228 int qbits = atoi(value);
229 return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DSA, EVP_PKEY_OP_PARAMGEN,
230 EVP_PKEY_CTRL_DSA_PARAMGEN_Q_BITS, qbits,
231 NULL);
232 }
233 if (strcmp(type, "dsa_paramgen_md") == 0) {
234 const EVP_MD *md = EVP_get_digestbyname(value);
235
236 if (md == NULL) {
237 DSAerr(DSA_F_PKEY_DSA_CTRL_STR, DSA_R_INVALID_DIGEST_TYPE);
238 return 0;
239 }
240 return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DSA, EVP_PKEY_OP_PARAMGEN,
241 EVP_PKEY_CTRL_DSA_PARAMGEN_MD, 0,
242 (void *)md);
243 }
244 return -2;
245 }
246
pkey_dsa_paramgen(EVP_PKEY_CTX * ctx,EVP_PKEY * pkey)247 static int pkey_dsa_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
248 {
249 DSA *dsa = NULL;
250 DSA_PKEY_CTX *dctx = ctx->data;
251 BN_GENCB *pcb, cb;
252 int ret;
253 if (ctx->pkey_gencb) {
254 pcb = &cb;
255 evp_pkey_set_cb_translate(pcb, ctx);
256 } else
257 pcb = NULL;
258 dsa = DSA_new();
259 if (!dsa)
260 return 0;
261 ret = dsa_builtin_paramgen(dsa, dctx->nbits, dctx->qbits, dctx->pmd,
262 NULL, 0, NULL, NULL, NULL, pcb);
263 if (ret)
264 EVP_PKEY_assign_DSA(pkey, dsa);
265 else
266 DSA_free(dsa);
267 return ret;
268 }
269
pkey_dsa_keygen(EVP_PKEY_CTX * ctx,EVP_PKEY * pkey)270 static int pkey_dsa_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
271 {
272 DSA *dsa = NULL;
273 if (ctx->pkey == NULL) {
274 DSAerr(DSA_F_PKEY_DSA_KEYGEN, DSA_R_NO_PARAMETERS_SET);
275 return 0;
276 }
277 dsa = DSA_new();
278 if (!dsa)
279 return 0;
280 EVP_PKEY_assign_DSA(pkey, dsa);
281 /* Note: if error return, pkey is freed by parent routine */
282 if (!EVP_PKEY_copy_parameters(pkey, ctx->pkey))
283 return 0;
284 return DSA_generate_key(pkey->pkey.dsa);
285 }
286
287 const EVP_PKEY_METHOD dsa_pkey_meth = {
288 EVP_PKEY_DSA,
289 EVP_PKEY_FLAG_AUTOARGLEN,
290 pkey_dsa_init,
291 pkey_dsa_copy,
292 pkey_dsa_cleanup,
293
294 0,
295 pkey_dsa_paramgen,
296
297 0,
298 pkey_dsa_keygen,
299
300 0,
301 pkey_dsa_sign,
302
303 0,
304 pkey_dsa_verify,
305
306 0, 0,
307
308 0, 0, 0, 0,
309
310 0, 0,
311
312 0, 0,
313
314 0, 0,
315
316 pkey_dsa_ctrl,
317 pkey_dsa_ctrl_str
318 };
319