Line data Source code
1 : /*
2 : * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
3 : * 2006.
4 : */
5 : /* ====================================================================
6 : * Copyright (c) 2006 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: 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 0 : static int pkey_dsa_init(EVP_PKEY_CTX *ctx)
82 : {
83 : DSA_PKEY_CTX *dctx;
84 0 : dctx = OPENSSL_malloc(sizeof(DSA_PKEY_CTX));
85 0 : if (!dctx)
86 : return 0;
87 0 : dctx->nbits = 1024;
88 0 : dctx->qbits = 160;
89 0 : dctx->pmd = NULL;
90 0 : dctx->md = NULL;
91 :
92 0 : ctx->data = dctx;
93 0 : ctx->keygen_info = dctx->gentmp;
94 0 : ctx->keygen_info_count = 2;
95 :
96 0 : return 1;
97 : }
98 :
99 0 : static int pkey_dsa_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
100 : {
101 : DSA_PKEY_CTX *dctx, *sctx;
102 0 : if (!pkey_dsa_init(dst))
103 : return 0;
104 0 : sctx = src->data;
105 0 : dctx = dst->data;
106 0 : dctx->nbits = sctx->nbits;
107 0 : dctx->qbits = sctx->qbits;
108 0 : dctx->pmd = sctx->pmd;
109 0 : dctx->md = sctx->md;
110 0 : return 1;
111 : }
112 :
113 0 : static void pkey_dsa_cleanup(EVP_PKEY_CTX *ctx)
114 : {
115 0 : DSA_PKEY_CTX *dctx = ctx->data;
116 0 : if (dctx)
117 0 : OPENSSL_free(dctx);
118 0 : }
119 :
120 0 : 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 0 : DSA_PKEY_CTX *dctx = ctx->data;
127 0 : DSA *dsa = ctx->pkey->pkey.dsa;
128 :
129 0 : if (dctx->md)
130 0 : type = EVP_MD_type(dctx->md);
131 : else
132 : type = NID_sha1;
133 :
134 0 : ret = DSA_sign(type, tbs, tbslen, sig, &sltmp, dsa);
135 :
136 0 : if (ret <= 0)
137 : return ret;
138 0 : *siglen = sltmp;
139 0 : return 1;
140 : }
141 :
142 0 : 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 0 : DSA_PKEY_CTX *dctx = ctx->data;
148 0 : DSA *dsa = ctx->pkey->pkey.dsa;
149 :
150 0 : if (dctx->md)
151 0 : type = EVP_MD_type(dctx->md);
152 : else
153 : type = NID_sha1;
154 :
155 0 : ret = DSA_verify(type, tbs, tbslen, sig, siglen, dsa);
156 :
157 0 : return ret;
158 : }
159 :
160 0 : static int pkey_dsa_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
161 : {
162 0 : DSA_PKEY_CTX *dctx = ctx->data;
163 0 : switch (type) {
164 : case EVP_PKEY_CTRL_DSA_PARAMGEN_BITS:
165 0 : if (p1 < 256)
166 : return -2;
167 0 : dctx->nbits = p1;
168 0 : return 1;
169 :
170 : case EVP_PKEY_CTRL_DSA_PARAMGEN_Q_BITS:
171 0 : if (p1 != 160 && p1 != 224 && p1 && p1 != 256)
172 : return -2;
173 0 : dctx->qbits = p1;
174 0 : return 1;
175 :
176 : case EVP_PKEY_CTRL_DSA_PARAMGEN_MD:
177 0 : if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1 &&
178 0 : EVP_MD_type((const EVP_MD *)p2) != NID_sha224 &&
179 0 : EVP_MD_type((const EVP_MD *)p2) != NID_sha256) {
180 0 : DSAerr(DSA_F_PKEY_DSA_CTRL, DSA_R_INVALID_DIGEST_TYPE);
181 0 : return 0;
182 : }
183 0 : dctx->md = p2;
184 0 : return 1;
185 :
186 : case EVP_PKEY_CTRL_MD:
187 0 : if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1 &&
188 0 : EVP_MD_type((const EVP_MD *)p2) != NID_dsa &&
189 0 : EVP_MD_type((const EVP_MD *)p2) != NID_dsaWithSHA &&
190 0 : EVP_MD_type((const EVP_MD *)p2) != NID_sha224 &&
191 0 : EVP_MD_type((const EVP_MD *)p2) != NID_sha256 &&
192 0 : EVP_MD_type((const EVP_MD *)p2) != NID_sha384 &&
193 0 : EVP_MD_type((const EVP_MD *)p2) != NID_sha512) {
194 0 : DSAerr(DSA_F_PKEY_DSA_CTRL, DSA_R_INVALID_DIGEST_TYPE);
195 0 : return 0;
196 : }
197 0 : dctx->md = p2;
198 0 : return 1;
199 :
200 : case EVP_PKEY_CTRL_GET_MD:
201 0 : *(const EVP_MD **)p2 = dctx->md;
202 0 : 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 0 : DSAerr(DSA_F_PKEY_DSA_CTRL,
211 : EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
212 0 : return -2;
213 : default:
214 0 : return -2;
215 :
216 : }
217 : }
218 :
219 0 : static int pkey_dsa_ctrl_str(EVP_PKEY_CTX *ctx,
220 : const char *type, const char *value)
221 : {
222 0 : if (!strcmp(type, "dsa_paramgen_bits")) {
223 : int nbits;
224 : nbits = atoi(value);
225 0 : return EVP_PKEY_CTX_set_dsa_paramgen_bits(ctx, nbits);
226 : }
227 0 : if (!strcmp(type, "dsa_paramgen_q_bits")) {
228 : int qbits = atoi(value);
229 0 : 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 0 : if (!strcmp(type, "dsa_paramgen_md")) {
234 0 : return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DSA, EVP_PKEY_OP_PARAMGEN,
235 : EVP_PKEY_CTRL_DSA_PARAMGEN_MD, 0,
236 0 : (void *)EVP_get_digestbyname(value));
237 : }
238 : return -2;
239 : }
240 :
241 0 : static int pkey_dsa_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
242 : {
243 : DSA *dsa = NULL;
244 0 : DSA_PKEY_CTX *dctx = ctx->data;
245 : BN_GENCB *pcb, cb;
246 : int ret;
247 0 : if (ctx->pkey_gencb) {
248 : pcb = &cb;
249 0 : evp_pkey_set_cb_translate(pcb, ctx);
250 : } else
251 : pcb = NULL;
252 0 : dsa = DSA_new();
253 0 : if (!dsa)
254 : return 0;
255 0 : ret = dsa_builtin_paramgen(dsa, dctx->nbits, dctx->qbits, dctx->pmd,
256 : NULL, 0, NULL, NULL, NULL, pcb);
257 0 : if (ret)
258 0 : EVP_PKEY_assign_DSA(pkey, dsa);
259 : else
260 0 : DSA_free(dsa);
261 0 : return ret;
262 : }
263 :
264 0 : static int pkey_dsa_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
265 : {
266 : DSA *dsa = NULL;
267 0 : if (ctx->pkey == NULL) {
268 0 : DSAerr(DSA_F_PKEY_DSA_KEYGEN, DSA_R_NO_PARAMETERS_SET);
269 0 : return 0;
270 : }
271 0 : dsa = DSA_new();
272 0 : if (!dsa)
273 : return 0;
274 0 : EVP_PKEY_assign_DSA(pkey, dsa);
275 : /* Note: if error return, pkey is freed by parent routine */
276 0 : if (!EVP_PKEY_copy_parameters(pkey, ctx->pkey))
277 : return 0;
278 0 : return DSA_generate_key(pkey->pkey.dsa);
279 : }
280 :
281 : const EVP_PKEY_METHOD dsa_pkey_meth = {
282 : EVP_PKEY_DSA,
283 : EVP_PKEY_FLAG_AUTOARGLEN,
284 : pkey_dsa_init,
285 : pkey_dsa_copy,
286 : pkey_dsa_cleanup,
287 :
288 : 0,
289 : pkey_dsa_paramgen,
290 :
291 : 0,
292 : pkey_dsa_keygen,
293 :
294 : 0,
295 : pkey_dsa_sign,
296 :
297 : 0,
298 : pkey_dsa_verify,
299 :
300 : 0, 0,
301 :
302 : 0, 0, 0, 0,
303 :
304 : 0, 0,
305 :
306 : 0, 0,
307 :
308 : 0, 0,
309 :
310 : pkey_dsa_ctrl,
311 : pkey_dsa_ctrl_str
312 : };
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