1 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
2 * project 2006.
3 */
4 /* ====================================================================
5 * Copyright (c) 2006 The OpenSSL Project. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 *
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
17 * distribution.
18 *
19 * 3. All advertising materials mentioning features or use of this
20 * software must display the following acknowledgment:
21 * "This product includes software developed by the OpenSSL Project
22 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
23 *
24 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
25 * endorse or promote products derived from this software without
26 * prior written permission. For written permission, please contact
27 * licensing@OpenSSL.org.
28 *
29 * 5. Products derived from this software may not be called "OpenSSL"
30 * nor may "OpenSSL" appear in their names without prior written
31 * permission of the OpenSSL Project.
32 *
33 * 6. Redistributions of any form whatsoever must retain the following
34 * acknowledgment:
35 * "This product includes software developed by the OpenSSL Project
36 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
37 *
38 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
39 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
40 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
41 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
42 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
43 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
44 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
45 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
46 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
47 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
48 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
49 * OF THE POSSIBILITY OF SUCH DAMAGE.
50 * ====================================================================
51 *
52 * This product includes cryptographic software written by Eric Young
53 * (eay@cryptsoft.com). This product includes software written by Tim
54 * Hudson (tjh@cryptsoft.com).
55 *
56 */
57
58 #include <stdio.h>
59 #include "cryptlib.h"
60 #include <openssl/asn1t.h>
61 #include <openssl/x509.h>
62 #include <openssl/evp.h>
63 #include <openssl/bn.h>
64 #include "evp_locl.h"
65 #include "dsa_locl.h"
66
67 /* DSA pkey context structure */
68
69 typedef struct
70 {
71 /* Parameter gen parameters */
72 int nbits; /* size of p in bits (default: 1024) */
73 int qbits; /* size of q in bits (default: 160) */
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
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 = 1024;
88 dctx->qbits = 160;
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
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
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
120 static int pkey_dsa_sign(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
121 const unsigned char *tbs, size_t tbslen)
122 {
123 int ret, type;
124 unsigned int sltmp;
125 DSA_PKEY_CTX *dctx = ctx->data;
126 DSA *dsa = ctx->pkey->pkey.dsa;
127
128 if (dctx->md)
129 type = EVP_MD_type(dctx->md);
130 else
131 type = NID_sha1;
132
133 ret = DSA_sign(type, tbs, tbslen, sig, &sltmp, dsa);
134
135 if (ret <= 0)
136 return ret;
137 *siglen = sltmp;
138 return 1;
139 }
140
141 static int pkey_dsa_verify(EVP_PKEY_CTX *ctx,
142 const unsigned char *sig, size_t siglen,
143 const unsigned char *tbs, size_t tbslen)
144 {
145 int ret, type;
146 DSA_PKEY_CTX *dctx = ctx->data;
147 DSA *dsa = ctx->pkey->pkey.dsa;
148
149 if (dctx->md)
150 type = EVP_MD_type(dctx->md);
151 else
152 type = NID_sha1;
153
154 ret = DSA_verify(type, tbs, tbslen, sig, siglen, dsa);
155
156 return ret;
157 }
158
159 static int pkey_dsa_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
160 {
161 DSA_PKEY_CTX *dctx = ctx->data;
162 switch (type)
163 {
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 {
181 DSAerr(DSA_F_PKEY_DSA_CTRL, DSA_R_INVALID_DIGEST_TYPE);
182 return 0;
183 }
184 dctx->md = p2;
185 return 1;
186
187 case EVP_PKEY_CTRL_MD:
188 if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1 &&
189 EVP_MD_type((const EVP_MD *)p2) != NID_dsa &&
190 EVP_MD_type((const EVP_MD *)p2) != NID_dsaWithSHA &&
191 EVP_MD_type((const EVP_MD *)p2) != NID_sha224 &&
192 EVP_MD_type((const EVP_MD *)p2) != NID_sha256 &&
193 EVP_MD_type((const EVP_MD *)p2) != NID_sha384 &&
194 EVP_MD_type((const EVP_MD *)p2) != NID_sha512)
195 {
196 DSAerr(DSA_F_PKEY_DSA_CTRL, DSA_R_INVALID_DIGEST_TYPE);
197 return 0;
198 }
199 dctx->md = p2;
200 return 1;
201
202 case EVP_PKEY_CTRL_DIGESTINIT:
203 case EVP_PKEY_CTRL_PKCS7_SIGN:
204 case EVP_PKEY_CTRL_CMS_SIGN:
205 return 1;
206
207 case EVP_PKEY_CTRL_PEER_KEY:
208 DSAerr(DSA_F_PKEY_DSA_CTRL,
209 EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
210 return -2;
211 default:
212 return -2;
213
214 }
215 }
216
217 static int pkey_dsa_ctrl_str(EVP_PKEY_CTX *ctx,
218 const char *type, const char *value)
219 {
220 if (!strcmp(type, "dsa_paramgen_bits"))
221 {
222 int nbits;
223 nbits = atoi(value);
224 return EVP_PKEY_CTX_set_dsa_paramgen_bits(ctx, nbits);
225 }
226 if (!strcmp(type, "dsa_paramgen_q_bits"))
227 {
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, NULL);
231 }
232 if (!strcmp(type, "dsa_paramgen_md"))
233 {
234 return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DSA, EVP_PKEY_OP_PARAMGEN,
235 EVP_PKEY_CTRL_DSA_PARAMGEN_MD, 0,
236 (void *)EVP_get_digestbyname(value));
237 }
238 return -2;
239 }
240
241 static int pkey_dsa_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
242 {
243 DSA *dsa = NULL;
244 DSA_PKEY_CTX *dctx = ctx->data;
245 BN_GENCB *pcb, cb;
246 int ret;
247 if (ctx->pkey_gencb)
248 {
249 pcb = &cb;
250 evp_pkey_set_cb_translate(pcb, ctx);
251 }
252 else
253 pcb = NULL;
254 dsa = DSA_new();
255 if (!dsa)
256 return 0;
257 ret = dsa_builtin_paramgen(dsa, dctx->nbits, dctx->qbits, dctx->pmd,
258 NULL, 0, NULL, NULL, NULL, pcb);
259 if (ret)
260 EVP_PKEY_assign_DSA(pkey, dsa);
261 else
262 DSA_free(dsa);
263 return ret;
264 }
265
266 static int pkey_dsa_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
267 {
268 DSA *dsa = NULL;
269 if (ctx->pkey == NULL)
270 {
271 DSAerr(DSA_F_PKEY_DSA_KEYGEN, DSA_R_NO_PARAMETERS_SET);
272 return 0;
273 }
274 dsa = DSA_new();
275 if (!dsa)
276 return 0;
277 EVP_PKEY_assign_DSA(pkey, dsa);
278 /* Note: if error return, pkey is freed by parent routine */
279 if (!EVP_PKEY_copy_parameters(pkey, ctx->pkey))
280 return 0;
281 return DSA_generate_key(pkey->pkey.dsa);
282 }
283
284 const EVP_PKEY_METHOD dsa_pkey_meth =
285 {
286 EVP_PKEY_DSA,
287 EVP_PKEY_FLAG_AUTOARGLEN,
288 pkey_dsa_init,
289 pkey_dsa_copy,
290 pkey_dsa_cleanup,
291
292 0,
293 pkey_dsa_paramgen,
294
295 0,
296 pkey_dsa_keygen,
297
298 0,
299 pkey_dsa_sign,
300
301 0,
302 pkey_dsa_verify,
303
304 0,0,
305
306 0,0,0,0,
307
308 0,0,
309
310 0,0,
311
312 0,0,
313
314 pkey_dsa_ctrl,
315 pkey_dsa_ctrl_str
316
317
318 };