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diff --git a/src/lib/libcrypto/dsa/dsa_ossl.c b/src/lib/libcrypto/dsa/dsa_ossl.c
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1/* crypto/dsa/dsa_ossl.c */
2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58
59/* Original version from Steven Schoch <schoch@sheba.arc.nasa.gov> */
60
61#include <stdio.h>
62#include "cryptlib.h"
63#include <openssl/bn.h>
64#include <openssl/dsa.h>
65#include <openssl/rand.h>
66#include <openssl/asn1.h>
67#include <openssl/engine.h>
68
69int __BN_rand_range(BIGNUM *r, BIGNUM *range);
70
71static DSA_SIG *dsa_do_sign(const unsigned char *dgst, int dlen, DSA *dsa);
72static int dsa_sign_setup(DSA *dsa, BN_CTX *ctx_in, BIGNUM **kinvp, BIGNUM **rp);
73static int dsa_do_verify(const unsigned char *dgst, int dgst_len, DSA_SIG *sig,
74 DSA *dsa);
75static int dsa_init(DSA *dsa);
76static int dsa_finish(DSA *dsa);
77static int dsa_mod_exp(DSA *dsa, BIGNUM *rr, BIGNUM *a1, BIGNUM *p1,
78 BIGNUM *a2, BIGNUM *p2, BIGNUM *m, BN_CTX *ctx,
79 BN_MONT_CTX *in_mont);
80static int dsa_bn_mod_exp(DSA *dsa, BIGNUM *r, BIGNUM *a, const BIGNUM *p,
81 const BIGNUM *m, BN_CTX *ctx,
82 BN_MONT_CTX *m_ctx);
83
84static DSA_METHOD openssl_dsa_meth = {
85"OpenSSL DSA method",
86dsa_do_sign,
87dsa_sign_setup,
88dsa_do_verify,
89dsa_mod_exp,
90dsa_bn_mod_exp,
91dsa_init,
92dsa_finish,
930,
94NULL
95};
96
97DSA_METHOD *DSA_OpenSSL(void)
98{
99 return &openssl_dsa_meth;
100}
101
102static DSA_SIG *dsa_do_sign(const unsigned char *dgst, int dlen, DSA *dsa)
103 {
104 BIGNUM *kinv=NULL,*r=NULL,*s=NULL;
105 BIGNUM m;
106 BIGNUM xr;
107 BN_CTX *ctx=NULL;
108 int i,reason=ERR_R_BN_LIB;
109 DSA_SIG *ret=NULL;
110
111 if (!dsa->p || !dsa->q || !dsa->g)
112 {
113 reason=DSA_R_MISSING_PARAMETERS;
114 goto err;
115 }
116 BN_init(&m);
117 BN_init(&xr);
118 s=BN_new();
119 if (s == NULL) goto err;
120
121 i=BN_num_bytes(dsa->q); /* should be 20 */
122 if ((dlen > i) || (dlen > 50))
123 {
124 reason=DSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE;
125 goto err;
126 }
127
128 ctx=BN_CTX_new();
129 if (ctx == NULL) goto err;
130
131 if ((dsa->kinv == NULL) || (dsa->r == NULL))
132 {
133 if (!DSA_sign_setup(dsa,ctx,&kinv,&r)) goto err;
134 }
135 else
136 {
137 kinv=dsa->kinv;
138 dsa->kinv=NULL;
139 r=dsa->r;
140 dsa->r=NULL;
141 }
142
143 if (BN_bin2bn(dgst,dlen,&m) == NULL) goto err;
144
145 /* Compute s = inv(k) (m + xr) mod q */
146 if (!BN_mod_mul(&xr,dsa->priv_key,r,dsa->q,ctx)) goto err;/* s = xr */
147 if (!BN_add(s, &xr, &m)) goto err; /* s = m + xr */
148 if (BN_cmp(s,dsa->q) > 0)
149 BN_sub(s,s,dsa->q);
150 if (!BN_mod_mul(s,s,kinv,dsa->q,ctx)) goto err;
151
152 ret=DSA_SIG_new();
153 if (ret == NULL) goto err;
154 ret->r = r;
155 ret->s = s;
156
157err:
158 if (!ret)
159 {
160 DSAerr(DSA_F_DSA_DO_SIGN,reason);
161 BN_free(r);
162 BN_free(s);
163 }
164 if (ctx != NULL) BN_CTX_free(ctx);
165 BN_clear_free(&m);
166 BN_clear_free(&xr);
167 if (kinv != NULL) /* dsa->kinv is NULL now if we used it */
168 BN_clear_free(kinv);
169 return(ret);
170 }
171
172static int dsa_sign_setup(DSA *dsa, BN_CTX *ctx_in, BIGNUM **kinvp, BIGNUM **rp)
173 {
174 BN_CTX *ctx;
175 BIGNUM k,*kinv=NULL,*r=NULL;
176 int ret=0;
177
178 if (!dsa->p || !dsa->q || !dsa->g)
179 {
180 DSAerr(DSA_F_DSA_SIGN_SETUP,DSA_R_MISSING_PARAMETERS);
181 return 0;
182 }
183 if (ctx_in == NULL)
184 {
185 if ((ctx=BN_CTX_new()) == NULL) goto err;
186 }
187 else
188 ctx=ctx_in;
189
190 BN_init(&k);
191 if ((r=BN_new()) == NULL) goto err;
192 kinv=NULL;
193
194 /* Get random k */
195 do
196 if (!__BN_rand_range(&k, dsa->q)) goto err;
197 while (BN_is_zero(&k));
198
199 if ((dsa->method_mont_p == NULL) && (dsa->flags & DSA_FLAG_CACHE_MONT_P))
200 {
201 if ((dsa->method_mont_p=(char *)BN_MONT_CTX_new()) != NULL)
202 if (!BN_MONT_CTX_set((BN_MONT_CTX *)dsa->method_mont_p,
203 dsa->p,ctx)) goto err;
204 }
205
206 /* Compute r = (g^k mod p) mod q */
207 if (!ENGINE_get_DSA(dsa->engine)->bn_mod_exp(dsa, r,dsa->g,&k,dsa->p,ctx,
208 (BN_MONT_CTX *)dsa->method_mont_p)) goto err;
209 if (!BN_mod(r,r,dsa->q,ctx)) goto err;
210
211 /* Compute part of 's = inv(k) (m + xr) mod q' */
212 if ((kinv=BN_mod_inverse(NULL,&k,dsa->q,ctx)) == NULL) goto err;
213
214 if (*kinvp != NULL) BN_clear_free(*kinvp);
215 *kinvp=kinv;
216 kinv=NULL;
217 if (*rp != NULL) BN_clear_free(*rp);
218 *rp=r;
219 ret=1;
220err:
221 if (!ret)
222 {
223 DSAerr(DSA_F_DSA_SIGN_SETUP,ERR_R_BN_LIB);
224 if (kinv != NULL) BN_clear_free(kinv);
225 if (r != NULL) BN_clear_free(r);
226 }
227 if (ctx_in == NULL) BN_CTX_free(ctx);
228 if (kinv != NULL) BN_clear_free(kinv);
229 BN_clear_free(&k);
230 return(ret);
231 }
232
233static int dsa_do_verify(const unsigned char *dgst, int dgst_len, DSA_SIG *sig,
234 DSA *dsa)
235 {
236 BN_CTX *ctx;
237 BIGNUM u1,u2,t1;
238 BN_MONT_CTX *mont=NULL;
239 int ret = -1;
240
241 if ((ctx=BN_CTX_new()) == NULL) goto err;
242 BN_init(&u1);
243 BN_init(&u2);
244 BN_init(&t1);
245
246 if (BN_is_zero(sig->r) || sig->r->neg || BN_ucmp(sig->r, dsa->q) >= 0)
247 {
248 ret = 0;
249 goto err;
250 }
251 if (BN_is_zero(sig->s) || sig->s->neg || BN_ucmp(sig->s, dsa->q) >= 0)
252 {
253 ret = 0;
254 goto err;
255 }
256
257 /* Calculate W = inv(S) mod Q
258 * save W in u2 */
259 if ((BN_mod_inverse(&u2,sig->s,dsa->q,ctx)) == NULL) goto err;
260
261 /* save M in u1 */
262 if (BN_bin2bn(dgst,dgst_len,&u1) == NULL) goto err;
263
264 /* u1 = M * w mod q */
265 if (!BN_mod_mul(&u1,&u1,&u2,dsa->q,ctx)) goto err;
266
267 /* u2 = r * w mod q */
268 if (!BN_mod_mul(&u2,sig->r,&u2,dsa->q,ctx)) goto err;
269
270 if ((dsa->method_mont_p == NULL) && (dsa->flags & DSA_FLAG_CACHE_MONT_P))
271 {
272 if ((dsa->method_mont_p=(char *)BN_MONT_CTX_new()) != NULL)
273 if (!BN_MONT_CTX_set((BN_MONT_CTX *)dsa->method_mont_p,
274 dsa->p,ctx)) goto err;
275 }
276 mont=(BN_MONT_CTX *)dsa->method_mont_p;
277
278#if 0
279 {
280 BIGNUM t2;
281
282 BN_init(&t2);
283 /* v = ( g^u1 * y^u2 mod p ) mod q */
284 /* let t1 = g ^ u1 mod p */
285 if (!BN_mod_exp_mont(&t1,dsa->g,&u1,dsa->p,ctx,mont)) goto err;
286 /* let t2 = y ^ u2 mod p */
287 if (!BN_mod_exp_mont(&t2,dsa->pub_key,&u2,dsa->p,ctx,mont)) goto err;
288 /* let u1 = t1 * t2 mod p */
289 if (!BN_mod_mul(&u1,&t1,&t2,dsa->p,ctx)) goto err_bn;
290 BN_free(&t2);
291 }
292 /* let u1 = u1 mod q */
293 if (!BN_mod(&u1,&u1,dsa->q,ctx)) goto err;
294#else
295 {
296 if (!ENGINE_get_DSA(dsa->engine)->dsa_mod_exp(dsa, &t1,dsa->g,&u1,dsa->pub_key,&u2,
297 dsa->p,ctx,mont)) goto err;
298 /* BN_copy(&u1,&t1); */
299 /* let u1 = u1 mod q */
300 if (!BN_mod(&u1,&t1,dsa->q,ctx)) goto err;
301 }
302#endif
303 /* V is now in u1. If the signature is correct, it will be
304 * equal to R. */
305 ret=(BN_ucmp(&u1, sig->r) == 0);
306
307 err:
308 if (ret != 1) DSAerr(DSA_F_DSA_DO_VERIFY,ERR_R_BN_LIB);
309 if (ctx != NULL) BN_CTX_free(ctx);
310 BN_free(&u1);
311 BN_free(&u2);
312 BN_free(&t1);
313 return(ret);
314 }
315
316static int dsa_init(DSA *dsa)
317{
318 dsa->flags|=DSA_FLAG_CACHE_MONT_P;
319 return(1);
320}
321
322static int dsa_finish(DSA *dsa)
323{
324 if(dsa->method_mont_p)
325 BN_MONT_CTX_free((BN_MONT_CTX *)dsa->method_mont_p);
326 return(1);
327}
328
329static int dsa_mod_exp(DSA *dsa, BIGNUM *rr, BIGNUM *a1, BIGNUM *p1,
330 BIGNUM *a2, BIGNUM *p2, BIGNUM *m, BN_CTX *ctx,
331 BN_MONT_CTX *in_mont)
332{
333 return BN_mod_exp2_mont(rr, a1, p1, a2, p2, m, ctx, in_mont);
334}
335
336static int dsa_bn_mod_exp(DSA *dsa, BIGNUM *r, BIGNUM *a, const BIGNUM *p,
337 const BIGNUM *m, BN_CTX *ctx,
338 BN_MONT_CTX *m_ctx)
339{
340 return BN_mod_exp_mont(r, a, p, m, ctx, m_ctx);
341}
342
343
344/* random number r: 0 <= r < range */
345int __BN_rand_range(BIGNUM *r, BIGNUM *range)
346 {
347 int n;
348
349 if (range->neg || BN_is_zero(range))
350 {
351 /* BNerr(BN_F_BN_RAND_RANGE, BN_R_INVALID_RANGE); */
352 return 0;
353 }
354
355 n = BN_num_bits(range); /* n > 0 */
356
357 if (n == 1)
358 {
359 if (!BN_zero(r)) return 0;
360 }
361 else if (BN_is_bit_set(range, n - 2))
362 {
363 do
364 {
365 /* range = 11..._2, so each iteration succeeds with probability >= .75 */
366 if (!BN_rand(r, n, -1, 0)) return 0;
367 }
368 while (BN_cmp(r, range) >= 0);
369 }
370 else
371 {
372 /* range = 10..._2,
373 * so 3*range (= 11..._2) is exactly one bit longer than range */
374 do
375 {
376 if (!BN_rand(r, n + 1, -1, 0)) return 0;
377 /* If r < 3*range, use r := r MOD range
378 * (which is either r, r - range, or r - 2*range).
379 * Otherwise, iterate once more.
380 * Since 3*range = 11..._2, each iteration succeeds with
381 * probability >= .75. */
382 if (BN_cmp(r ,range) >= 0)
383 {
384 if (!BN_sub(r, r, range)) return 0;
385 if (BN_cmp(r, range) >= 0)
386 if (!BN_sub(r, r, range)) return 0;
387 }
388 }
389 while (BN_cmp(r, range) >= 0);
390 }
391
392 return 1;
393 }
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