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diff --git a/src/lib/libcrypto/ecdsa/ecs_ossl.c b/src/lib/libcrypto/ecdsa/ecs_ossl.c
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1/* crypto/ecdsa/ecs_ossl.c */
2/*
3 * Written by Nils Larsch for the OpenSSL project
4 */
5/* ====================================================================
6 * Copyright (c) 1998-2004 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 * openssl-core@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 "ecs_locl.h"
60#include <openssl/err.h>
61#include <openssl/obj_mac.h>
62#include <openssl/bn.h>
63
64static ECDSA_SIG *ecdsa_do_sign(const unsigned char *dgst, int dlen,
65 const BIGNUM *, const BIGNUM *, EC_KEY *eckey);
66static int ecdsa_sign_setup(EC_KEY *eckey, BN_CTX *ctx_in, BIGNUM **kinvp,
67 BIGNUM **rp);
68static int ecdsa_do_verify(const unsigned char *dgst, int dgst_len,
69 const ECDSA_SIG *sig, EC_KEY *eckey);
70
71static ECDSA_METHOD openssl_ecdsa_meth = {
72 "OpenSSL ECDSA method",
73 ecdsa_do_sign,
74 ecdsa_sign_setup,
75 ecdsa_do_verify,
76#if 0
77 NULL, /* init */
78 NULL, /* finish */
79#endif
80 0, /* flags */
81 NULL /* app_data */
82};
83
84const ECDSA_METHOD *ECDSA_OpenSSL(void)
85{
86 return &openssl_ecdsa_meth;
87}
88
89static int ecdsa_sign_setup(EC_KEY *eckey, BN_CTX *ctx_in, BIGNUM **kinvp,
90 BIGNUM **rp)
91{
92 BN_CTX *ctx = NULL;
93 BIGNUM *k = NULL, *r = NULL, *order = NULL, *X = NULL;
94 EC_POINT *tmp_point=NULL;
95 const EC_GROUP *group;
96 int ret = 0;
97
98 if (eckey == NULL || (group = EC_KEY_get0_group(eckey)) == NULL)
99 {
100 ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_PASSED_NULL_PARAMETER);
101 return 0;
102 }
103
104 if (ctx_in == NULL)
105 {
106 if ((ctx = BN_CTX_new()) == NULL)
107 {
108 ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP,ERR_R_MALLOC_FAILURE);
109 return 0;
110 }
111 }
112 else
113 ctx = ctx_in;
114
115 k = BN_new(); /* this value is later returned in *kinvp */
116 r = BN_new(); /* this value is later returned in *rp */
117 order = BN_new();
118 X = BN_new();
119 if (!k || !r || !order || !X)
120 {
121 ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_MALLOC_FAILURE);
122 goto err;
123 }
124 if ((tmp_point = EC_POINT_new(group)) == NULL)
125 {
126 ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_EC_LIB);
127 goto err;
128 }
129 if (!EC_GROUP_get_order(group, order, ctx))
130 {
131 ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_EC_LIB);
132 goto err;
133 }
134
135 do
136 {
137 /* get random k */
138 do
139 if (!BN_rand_range(k, order))
140 {
141 ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP,
142 ECDSA_R_RANDOM_NUMBER_GENERATION_FAILED);
143 goto err;
144 }
145 while (BN_is_zero(k));
146
147 /* compute r the x-coordinate of generator * k */
148 if (!EC_POINT_mul(group, tmp_point, k, NULL, NULL, ctx))
149 {
150 ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_EC_LIB);
151 goto err;
152 }
153 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) == NID_X9_62_prime_field)
154 {
155 if (!EC_POINT_get_affine_coordinates_GFp(group,
156 tmp_point, X, NULL, ctx))
157 {
158 ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP,ERR_R_EC_LIB);
159 goto err;
160 }
161 }
162 else /* NID_X9_62_characteristic_two_field */
163 {
164 if (!EC_POINT_get_affine_coordinates_GF2m(group,
165 tmp_point, X, NULL, ctx))
166 {
167 ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP,ERR_R_EC_LIB);
168 goto err;
169 }
170 }
171 if (!BN_nnmod(r, X, order, ctx))
172 {
173 ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_BN_LIB);
174 goto err;
175 }
176 }
177 while (BN_is_zero(r));
178
179 /* compute the inverse of k */
180 if (!BN_mod_inverse(k, k, order, ctx))
181 {
182 ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_BN_LIB);
183 goto err;
184 }
185 /* clear old values if necessary */
186 if (*rp != NULL)
187 BN_clear_free(*rp);
188 if (*kinvp != NULL)
189 BN_clear_free(*kinvp);
190 /* save the pre-computed values */
191 *rp = r;
192 *kinvp = k;
193 ret = 1;
194err:
195 if (!ret)
196 {
197 if (k != NULL) BN_clear_free(k);
198 if (r != NULL) BN_clear_free(r);
199 }
200 if (ctx_in == NULL)
201 BN_CTX_free(ctx);
202 if (order != NULL)
203 BN_free(order);
204 if (tmp_point != NULL)
205 EC_POINT_free(tmp_point);
206 if (X)
207 BN_clear_free(X);
208 return(ret);
209}
210
211
212static ECDSA_SIG *ecdsa_do_sign(const unsigned char *dgst, int dgst_len,
213 const BIGNUM *in_kinv, const BIGNUM *in_r, EC_KEY *eckey)
214{
215 int ok = 0;
216 BIGNUM *kinv=NULL, *s, *m=NULL,*tmp=NULL,*order=NULL;
217 const BIGNUM *ckinv;
218 BN_CTX *ctx = NULL;
219 const EC_GROUP *group;
220 ECDSA_SIG *ret;
221 ECDSA_DATA *ecdsa;
222 const BIGNUM *priv_key;
223
224 ecdsa = ecdsa_check(eckey);
225 group = EC_KEY_get0_group(eckey);
226 priv_key = EC_KEY_get0_private_key(eckey);
227
228 if (group == NULL || priv_key == NULL || ecdsa == NULL)
229 {
230 ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_PASSED_NULL_PARAMETER);
231 return NULL;
232 }
233
234 ret = ECDSA_SIG_new();
235 if (!ret)
236 {
237 ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_MALLOC_FAILURE);
238 return NULL;
239 }
240 s = ret->s;
241
242 if ((ctx = BN_CTX_new()) == NULL || (order = BN_new()) == NULL ||
243 (tmp = BN_new()) == NULL || (m = BN_new()) == NULL)
244 {
245 ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_MALLOC_FAILURE);
246 goto err;
247 }
248
249 if (!EC_GROUP_get_order(group, order, ctx))
250 {
251 ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_EC_LIB);
252 goto err;
253 }
254 if (8 * dgst_len > BN_num_bits(order))
255 {
256 /* XXX
257 *
258 * Should provide for optional hash truncation:
259 * Keep the BN_num_bits(order) leftmost bits of dgst
260 * (see March 2006 FIPS 186-3 draft, which has a few
261 * confusing errors in this part though)
262 */
263
264 ECDSAerr(ECDSA_F_ECDSA_DO_SIGN,
265 ECDSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE);
266 goto err;
267 }
268
269 if (!BN_bin2bn(dgst, dgst_len, m))
270 {
271 ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_BN_LIB);
272 goto err;
273 }
274 do
275 {
276 if (in_kinv == NULL || in_r == NULL)
277 {
278 if (!ECDSA_sign_setup(eckey, ctx, &kinv, &ret->r))
279 {
280 ECDSAerr(ECDSA_F_ECDSA_DO_SIGN,ERR_R_ECDSA_LIB);
281 goto err;
282 }
283 ckinv = kinv;
284 }
285 else
286 {
287 ckinv = in_kinv;
288 if (BN_copy(ret->r, in_r) == NULL)
289 {
290 ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_MALLOC_FAILURE);
291 goto err;
292 }
293 }
294
295 if (!BN_mod_mul(tmp, priv_key, ret->r, order, ctx))
296 {
297 ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_BN_LIB);
298 goto err;
299 }
300 if (!BN_mod_add_quick(s, tmp, m, order))
301 {
302 ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_BN_LIB);
303 goto err;
304 }
305 if (!BN_mod_mul(s, s, ckinv, order, ctx))
306 {
307 ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_BN_LIB);
308 goto err;
309 }
310 if (BN_is_zero(s))
311 {
312 /* if kinv and r have been supplied by the caller
313 * don't to generate new kinv and r values */
314 if (in_kinv != NULL && in_r != NULL)
315 {
316 ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ECDSA_R_NEED_NEW_SETUP_VALUES);
317 goto err;
318 }
319 }
320 else
321 /* s != 0 => we have a valid signature */
322 break;
323 }
324 while (1);
325
326 ok = 1;
327err:
328 if (!ok)
329 {
330 ECDSA_SIG_free(ret);
331 ret = NULL;
332 }
333 if (ctx)
334 BN_CTX_free(ctx);
335 if (m)
336 BN_clear_free(m);
337 if (tmp)
338 BN_clear_free(tmp);
339 if (order)
340 BN_free(order);
341 if (kinv)
342 BN_clear_free(kinv);
343 return ret;
344}
345
346static int ecdsa_do_verify(const unsigned char *dgst, int dgst_len,
347 const ECDSA_SIG *sig, EC_KEY *eckey)
348{
349 int ret = -1;
350 BN_CTX *ctx;
351 BIGNUM *order, *u1, *u2, *m, *X;
352 EC_POINT *point = NULL;
353 const EC_GROUP *group;
354 const EC_POINT *pub_key;
355
356 /* check input values */
357 if (eckey == NULL || (group = EC_KEY_get0_group(eckey)) == NULL ||
358 (pub_key = EC_KEY_get0_public_key(eckey)) == NULL || sig == NULL)
359 {
360 ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ECDSA_R_MISSING_PARAMETERS);
361 return -1;
362 }
363
364 ctx = BN_CTX_new();
365 if (!ctx)
366 {
367 ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_MALLOC_FAILURE);
368 return -1;
369 }
370 BN_CTX_start(ctx);
371 order = BN_CTX_get(ctx);
372 u1 = BN_CTX_get(ctx);
373 u2 = BN_CTX_get(ctx);
374 m = BN_CTX_get(ctx);
375 X = BN_CTX_get(ctx);
376 if (!X)
377 {
378 ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_BN_LIB);
379 goto err;
380 }
381
382 if (!EC_GROUP_get_order(group, order, ctx))
383 {
384 ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_EC_LIB);
385 goto err;
386 }
387 if (8 * dgst_len > BN_num_bits(order))
388 {
389 /* XXX
390 *
391 * Should provide for optional hash truncation:
392 * Keep the BN_num_bits(order) leftmost bits of dgst
393 * (see March 2006 FIPS 186-3 draft, which has a few
394 * confusing errors in this part though)
395 */
396
397 ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY,
398 ECDSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE);
399 ret = 0;
400 goto err;
401 }
402
403 if (BN_is_zero(sig->r) || BN_is_negative(sig->r) ||
404 BN_ucmp(sig->r, order) >= 0 || BN_is_zero(sig->s) ||
405 BN_is_negative(sig->s) || BN_ucmp(sig->s, order) >= 0)
406 {
407 ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ECDSA_R_BAD_SIGNATURE);
408 ret = 0; /* signature is invalid */
409 goto err;
410 }
411 /* calculate tmp1 = inv(S) mod order */
412 if (!BN_mod_inverse(u2, sig->s, order, ctx))
413 {
414 ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_BN_LIB);
415 goto err;
416 }
417 /* digest -> m */
418 if (!BN_bin2bn(dgst, dgst_len, m))
419 {
420 ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_BN_LIB);
421 goto err;
422 }
423 /* u1 = m * tmp mod order */
424 if (!BN_mod_mul(u1, m, u2, order, ctx))
425 {
426 ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_BN_LIB);
427 goto err;
428 }
429 /* u2 = r * w mod q */
430 if (!BN_mod_mul(u2, sig->r, u2, order, ctx))
431 {
432 ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_BN_LIB);
433 goto err;
434 }
435
436 if ((point = EC_POINT_new(group)) == NULL)
437 {
438 ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_MALLOC_FAILURE);
439 goto err;
440 }
441 if (!EC_POINT_mul(group, point, u1, pub_key, u2, ctx))
442 {
443 ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_EC_LIB);
444 goto err;
445 }
446 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) == NID_X9_62_prime_field)
447 {
448 if (!EC_POINT_get_affine_coordinates_GFp(group,
449 point, X, NULL, ctx))
450 {
451 ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_EC_LIB);
452 goto err;
453 }
454 }
455 else /* NID_X9_62_characteristic_two_field */
456 {
457 if (!EC_POINT_get_affine_coordinates_GF2m(group,
458 point, X, NULL, ctx))
459 {
460 ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_EC_LIB);
461 goto err;
462 }
463 }
464
465 if (!BN_nnmod(u1, X, order, ctx))
466 {
467 ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_BN_LIB);
468 goto err;
469 }
470 /* if the signature is correct u1 is equal to sig->r */
471 ret = (BN_ucmp(u1, sig->r) == 0);
472err:
473 BN_CTX_end(ctx);
474 BN_CTX_free(ctx);
475 if (point)
476 EC_POINT_free(point);
477 return ret;
478}
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-10-25 00:59:26 +0000