source: EcnlProtoTool/trunk/openssl-1.1.0e/crypto/ec/ecdsa_ossl.c@ 331

Last change on this file since 331 was 331, checked in by coas-nagasima, 6 years ago

prototoolに関連するプロジェクトをnewlibからmuslを使うよう変更・更新
ntshellをnewlibの下位の実装から、muslのsyscallの実装に変更・更新
以下のOSSをアップデート
・mruby-1.3.0
・musl-1.1.18
・onigmo-6.1.3
・tcc-0.9.27
以下のOSSを追加
・openssl-1.1.0e
・curl-7.57.0
・zlib-1.2.11
以下のmrbgemsを追加
・iij/mruby-digest
・iij/mruby-env
・iij/mruby-errno
・iij/mruby-iijson
・iij/mruby-ipaddr
・iij/mruby-mock
・iij/mruby-require
・iij/mruby-tls-openssl
  • Property svn:eol-style set to native
  • Property svn:mime-type set to text/x-csrc
File size: 13.7 KB
Line 
1/*
2 * Copyright 2002-2016 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10#include <string.h>
11#include <openssl/err.h>
12#include <openssl/obj_mac.h>
13#include <openssl/bn.h>
14#include <openssl/rand.h>
15#include <openssl/ec.h>
16#include "ec_lcl.h"
17
18int ossl_ecdsa_sign(int type, const unsigned char *dgst, int dlen,
19 unsigned char *sig, unsigned int *siglen,
20 const BIGNUM *kinv, const BIGNUM *r, EC_KEY *eckey)
21{
22 ECDSA_SIG *s;
23 RAND_seed(dgst, dlen);
24 s = ECDSA_do_sign_ex(dgst, dlen, kinv, r, eckey);
25 if (s == NULL) {
26 *siglen = 0;
27 return 0;
28 }
29 *siglen = i2d_ECDSA_SIG(s, &sig);
30 ECDSA_SIG_free(s);
31 return 1;
32}
33
34static int ecdsa_sign_setup(EC_KEY *eckey, BN_CTX *ctx_in,
35 BIGNUM **kinvp, BIGNUM **rp,
36 const unsigned char *dgst, int dlen)
37{
38 BN_CTX *ctx = NULL;
39 BIGNUM *k = NULL, *r = NULL, *X = NULL;
40 const BIGNUM *order;
41 EC_POINT *tmp_point = NULL;
42 const EC_GROUP *group;
43 int ret = 0;
44
45 if (eckey == NULL || (group = EC_KEY_get0_group(eckey)) == NULL) {
46 ECerr(EC_F_ECDSA_SIGN_SETUP, ERR_R_PASSED_NULL_PARAMETER);
47 return 0;
48 }
49
50 if (!EC_KEY_can_sign(eckey)) {
51 ECerr(EC_F_ECDSA_SIGN_SETUP, EC_R_CURVE_DOES_NOT_SUPPORT_SIGNING);
52 return 0;
53 }
54
55 if (ctx_in == NULL) {
56 if ((ctx = BN_CTX_new()) == NULL) {
57 ECerr(EC_F_ECDSA_SIGN_SETUP, ERR_R_MALLOC_FAILURE);
58 return 0;
59 }
60 } else
61 ctx = ctx_in;
62
63 k = BN_new(); /* this value is later returned in *kinvp */
64 r = BN_new(); /* this value is later returned in *rp */
65 X = BN_new();
66 if (k == NULL || r == NULL || X == NULL) {
67 ECerr(EC_F_ECDSA_SIGN_SETUP, ERR_R_MALLOC_FAILURE);
68 goto err;
69 }
70 if ((tmp_point = EC_POINT_new(group)) == NULL) {
71 ECerr(EC_F_ECDSA_SIGN_SETUP, ERR_R_EC_LIB);
72 goto err;
73 }
74 order = EC_GROUP_get0_order(group);
75 if (order == NULL) {
76 ECerr(EC_F_ECDSA_SIGN_SETUP, ERR_R_EC_LIB);
77 goto err;
78 }
79
80 do {
81 /* get random k */
82 do
83 if (dgst != NULL) {
84 if (!BN_generate_dsa_nonce
85 (k, order, EC_KEY_get0_private_key(eckey), dgst, dlen,
86 ctx)) {
87 ECerr(EC_F_ECDSA_SIGN_SETUP,
88 EC_R_RANDOM_NUMBER_GENERATION_FAILED);
89 goto err;
90 }
91 } else {
92 if (!BN_rand_range(k, order)) {
93 ECerr(EC_F_ECDSA_SIGN_SETUP,
94 EC_R_RANDOM_NUMBER_GENERATION_FAILED);
95 goto err;
96 }
97 }
98 while (BN_is_zero(k));
99
100 /*
101 * We do not want timing information to leak the length of k, so we
102 * compute G*k using an equivalent scalar of fixed bit-length.
103 */
104
105 if (!BN_add(k, k, order))
106 goto err;
107 if (BN_num_bits(k) <= BN_num_bits(order))
108 if (!BN_add(k, k, order))
109 goto err;
110
111 /* compute r the x-coordinate of generator * k */
112 if (!EC_POINT_mul(group, tmp_point, k, NULL, NULL, ctx)) {
113 ECerr(EC_F_ECDSA_SIGN_SETUP, ERR_R_EC_LIB);
114 goto err;
115 }
116 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) ==
117 NID_X9_62_prime_field) {
118 if (!EC_POINT_get_affine_coordinates_GFp
119 (group, tmp_point, X, NULL, ctx)) {
120 ECerr(EC_F_ECDSA_SIGN_SETUP, ERR_R_EC_LIB);
121 goto err;
122 }
123 }
124#ifndef OPENSSL_NO_EC2M
125 else { /* NID_X9_62_characteristic_two_field */
126
127 if (!EC_POINT_get_affine_coordinates_GF2m(group,
128 tmp_point, X, NULL,
129 ctx)) {
130 ECerr(EC_F_ECDSA_SIGN_SETUP, ERR_R_EC_LIB);
131 goto err;
132 }
133 }
134#endif
135 if (!BN_nnmod(r, X, order, ctx)) {
136 ECerr(EC_F_ECDSA_SIGN_SETUP, ERR_R_BN_LIB);
137 goto err;
138 }
139 }
140 while (BN_is_zero(r));
141
142 /* compute the inverse of k */
143 if (EC_GROUP_get_mont_data(group) != NULL) {
144 /*
145 * We want inverse in constant time, therefore we utilize the fact
146 * order must be prime and use Fermats Little Theorem instead.
147 */
148 if (!BN_set_word(X, 2)) {
149 ECerr(EC_F_ECDSA_SIGN_SETUP, ERR_R_BN_LIB);
150 goto err;
151 }
152 if (!BN_mod_sub(X, order, X, order, ctx)) {
153 ECerr(EC_F_ECDSA_SIGN_SETUP, ERR_R_BN_LIB);
154 goto err;
155 }
156 BN_set_flags(X, BN_FLG_CONSTTIME);
157 if (!BN_mod_exp_mont_consttime
158 (k, k, X, order, ctx, EC_GROUP_get_mont_data(group))) {
159 ECerr(EC_F_ECDSA_SIGN_SETUP, ERR_R_BN_LIB);
160 goto err;
161 }
162 } else {
163 if (!BN_mod_inverse(k, k, order, ctx)) {
164 ECerr(EC_F_ECDSA_SIGN_SETUP, ERR_R_BN_LIB);
165 goto err;
166 }
167 }
168
169 /* clear old values if necessary */
170 BN_clear_free(*rp);
171 BN_clear_free(*kinvp);
172 /* save the pre-computed values */
173 *rp = r;
174 *kinvp = k;
175 ret = 1;
176 err:
177 if (!ret) {
178 BN_clear_free(k);
179 BN_clear_free(r);
180 }
181 if (ctx != ctx_in)
182 BN_CTX_free(ctx);
183 EC_POINT_free(tmp_point);
184 BN_clear_free(X);
185 return (ret);
186}
187
188int ossl_ecdsa_sign_setup(EC_KEY *eckey, BN_CTX *ctx_in, BIGNUM **kinvp,
189 BIGNUM **rp)
190{
191 return ecdsa_sign_setup(eckey, ctx_in, kinvp, rp, NULL, 0);
192}
193
194ECDSA_SIG *ossl_ecdsa_sign_sig(const unsigned char *dgst, int dgst_len,
195 const BIGNUM *in_kinv, const BIGNUM *in_r,
196 EC_KEY *eckey)
197{
198 int ok = 0, i;
199 BIGNUM *kinv = NULL, *s, *m = NULL, *tmp = NULL;
200 const BIGNUM *order, *ckinv;
201 BN_CTX *ctx = NULL;
202 const EC_GROUP *group;
203 ECDSA_SIG *ret;
204 const BIGNUM *priv_key;
205
206 group = EC_KEY_get0_group(eckey);
207 priv_key = EC_KEY_get0_private_key(eckey);
208
209 if (group == NULL || priv_key == NULL) {
210 ECerr(EC_F_OSSL_ECDSA_SIGN_SIG, ERR_R_PASSED_NULL_PARAMETER);
211 return NULL;
212 }
213
214 if (!EC_KEY_can_sign(eckey)) {
215 ECerr(EC_F_OSSL_ECDSA_SIGN_SIG, EC_R_CURVE_DOES_NOT_SUPPORT_SIGNING);
216 return NULL;
217 }
218
219 ret = ECDSA_SIG_new();
220 if (ret == NULL) {
221 ECerr(EC_F_OSSL_ECDSA_SIGN_SIG, ERR_R_MALLOC_FAILURE);
222 return NULL;
223 }
224 ret->r = BN_new();
225 ret->s = BN_new();
226 if (ret->r == NULL || ret->s == NULL) {
227 ECerr(EC_F_OSSL_ECDSA_SIGN_SIG, ERR_R_MALLOC_FAILURE);
228 goto err;
229 }
230 s = ret->s;
231
232 if ((ctx = BN_CTX_new()) == NULL ||
233 (tmp = BN_new()) == NULL || (m = BN_new()) == NULL) {
234 ECerr(EC_F_OSSL_ECDSA_SIGN_SIG, ERR_R_MALLOC_FAILURE);
235 goto err;
236 }
237
238 order = EC_GROUP_get0_order(group);
239 if (order == NULL) {
240 ECerr(EC_F_OSSL_ECDSA_SIGN_SIG, ERR_R_EC_LIB);
241 goto err;
242 }
243 i = BN_num_bits(order);
244 /*
245 * Need to truncate digest if it is too long: first truncate whole bytes.
246 */
247 if (8 * dgst_len > i)
248 dgst_len = (i + 7) / 8;
249 if (!BN_bin2bn(dgst, dgst_len, m)) {
250 ECerr(EC_F_OSSL_ECDSA_SIGN_SIG, ERR_R_BN_LIB);
251 goto err;
252 }
253 /* If still too long truncate remaining bits with a shift */
254 if ((8 * dgst_len > i) && !BN_rshift(m, m, 8 - (i & 0x7))) {
255 ECerr(EC_F_OSSL_ECDSA_SIGN_SIG, ERR_R_BN_LIB);
256 goto err;
257 }
258 do {
259 if (in_kinv == NULL || in_r == NULL) {
260 if (!ecdsa_sign_setup(eckey, ctx, &kinv, &ret->r, dgst, dgst_len)) {
261 ECerr(EC_F_OSSL_ECDSA_SIGN_SIG, ERR_R_ECDSA_LIB);
262 goto err;
263 }
264 ckinv = kinv;
265 } else {
266 ckinv = in_kinv;
267 if (BN_copy(ret->r, in_r) == NULL) {
268 ECerr(EC_F_OSSL_ECDSA_SIGN_SIG, ERR_R_MALLOC_FAILURE);
269 goto err;
270 }
271 }
272
273 if (!BN_mod_mul(tmp, priv_key, ret->r, order, ctx)) {
274 ECerr(EC_F_OSSL_ECDSA_SIGN_SIG, ERR_R_BN_LIB);
275 goto err;
276 }
277 if (!BN_mod_add_quick(s, tmp, m, order)) {
278 ECerr(EC_F_OSSL_ECDSA_SIGN_SIG, ERR_R_BN_LIB);
279 goto err;
280 }
281 if (!BN_mod_mul(s, s, ckinv, order, ctx)) {
282 ECerr(EC_F_OSSL_ECDSA_SIGN_SIG, ERR_R_BN_LIB);
283 goto err;
284 }
285 if (BN_is_zero(s)) {
286 /*
287 * if kinv and r have been supplied by the caller don't to
288 * generate new kinv and r values
289 */
290 if (in_kinv != NULL && in_r != NULL) {
291 ECerr(EC_F_OSSL_ECDSA_SIGN_SIG, EC_R_NEED_NEW_SETUP_VALUES);
292 goto err;
293 }
294 } else
295 /* s != 0 => we have a valid signature */
296 break;
297 }
298 while (1);
299
300 ok = 1;
301 err:
302 if (!ok) {
303 ECDSA_SIG_free(ret);
304 ret = NULL;
305 }
306 BN_CTX_free(ctx);
307 BN_clear_free(m);
308 BN_clear_free(tmp);
309 BN_clear_free(kinv);
310 return ret;
311}
312
313/*-
314 * returns
315 * 1: correct signature
316 * 0: incorrect signature
317 * -1: error
318 */
319int ossl_ecdsa_verify(int type, const unsigned char *dgst, int dgst_len,
320 const unsigned char *sigbuf, int sig_len, EC_KEY *eckey)
321{
322 ECDSA_SIG *s;
323 const unsigned char *p = sigbuf;
324 unsigned char *der = NULL;
325 int derlen = -1;
326 int ret = -1;
327
328 s = ECDSA_SIG_new();
329 if (s == NULL)
330 return (ret);
331 if (d2i_ECDSA_SIG(&s, &p, sig_len) == NULL)
332 goto err;
333 /* Ensure signature uses DER and doesn't have trailing garbage */
334 derlen = i2d_ECDSA_SIG(s, &der);
335 if (derlen != sig_len || memcmp(sigbuf, der, derlen) != 0)
336 goto err;
337 ret = ECDSA_do_verify(dgst, dgst_len, s, eckey);
338 err:
339 OPENSSL_clear_free(der, derlen);
340 ECDSA_SIG_free(s);
341 return (ret);
342}
343
344int ossl_ecdsa_verify_sig(const unsigned char *dgst, int dgst_len,
345 const ECDSA_SIG *sig, EC_KEY *eckey)
346{
347 int ret = -1, i;
348 BN_CTX *ctx;
349 const BIGNUM *order;
350 BIGNUM *u1, *u2, *m, *X;
351 EC_POINT *point = NULL;
352 const EC_GROUP *group;
353 const EC_POINT *pub_key;
354
355 /* check input values */
356 if (eckey == NULL || (group = EC_KEY_get0_group(eckey)) == NULL ||
357 (pub_key = EC_KEY_get0_public_key(eckey)) == NULL || sig == NULL) {
358 ECerr(EC_F_OSSL_ECDSA_VERIFY_SIG, EC_R_MISSING_PARAMETERS);
359 return -1;
360 }
361
362 if (!EC_KEY_can_sign(eckey)) {
363 ECerr(EC_F_OSSL_ECDSA_VERIFY_SIG, EC_R_CURVE_DOES_NOT_SUPPORT_SIGNING);
364 return -1;
365 }
366
367 ctx = BN_CTX_new();
368 if (ctx == NULL) {
369 ECerr(EC_F_OSSL_ECDSA_VERIFY_SIG, ERR_R_MALLOC_FAILURE);
370 return -1;
371 }
372 BN_CTX_start(ctx);
373 u1 = BN_CTX_get(ctx);
374 u2 = BN_CTX_get(ctx);
375 m = BN_CTX_get(ctx);
376 X = BN_CTX_get(ctx);
377 if (X == NULL) {
378 ECerr(EC_F_OSSL_ECDSA_VERIFY_SIG, ERR_R_BN_LIB);
379 goto err;
380 }
381
382 order = EC_GROUP_get0_order(group);
383 if (order == NULL) {
384 ECerr(EC_F_OSSL_ECDSA_VERIFY_SIG, ERR_R_EC_LIB);
385 goto err;
386 }
387
388 if (BN_is_zero(sig->r) || BN_is_negative(sig->r) ||
389 BN_ucmp(sig->r, order) >= 0 || BN_is_zero(sig->s) ||
390 BN_is_negative(sig->s) || BN_ucmp(sig->s, order) >= 0) {
391 ECerr(EC_F_OSSL_ECDSA_VERIFY_SIG, EC_R_BAD_SIGNATURE);
392 ret = 0; /* signature is invalid */
393 goto err;
394 }
395 /* calculate tmp1 = inv(S) mod order */
396 if (!BN_mod_inverse(u2, sig->s, order, ctx)) {
397 ECerr(EC_F_OSSL_ECDSA_VERIFY_SIG, ERR_R_BN_LIB);
398 goto err;
399 }
400 /* digest -> m */
401 i = BN_num_bits(order);
402 /*
403 * Need to truncate digest if it is too long: first truncate whole bytes.
404 */
405 if (8 * dgst_len > i)
406 dgst_len = (i + 7) / 8;
407 if (!BN_bin2bn(dgst, dgst_len, m)) {
408 ECerr(EC_F_OSSL_ECDSA_VERIFY_SIG, ERR_R_BN_LIB);
409 goto err;
410 }
411 /* If still too long truncate remaining bits with a shift */
412 if ((8 * dgst_len > i) && !BN_rshift(m, m, 8 - (i & 0x7))) {
413 ECerr(EC_F_OSSL_ECDSA_VERIFY_SIG, ERR_R_BN_LIB);
414 goto err;
415 }
416 /* u1 = m * tmp mod order */
417 if (!BN_mod_mul(u1, m, u2, order, ctx)) {
418 ECerr(EC_F_OSSL_ECDSA_VERIFY_SIG, ERR_R_BN_LIB);
419 goto err;
420 }
421 /* u2 = r * w mod q */
422 if (!BN_mod_mul(u2, sig->r, u2, order, ctx)) {
423 ECerr(EC_F_OSSL_ECDSA_VERIFY_SIG, ERR_R_BN_LIB);
424 goto err;
425 }
426
427 if ((point = EC_POINT_new(group)) == NULL) {
428 ECerr(EC_F_OSSL_ECDSA_VERIFY_SIG, ERR_R_MALLOC_FAILURE);
429 goto err;
430 }
431 if (!EC_POINT_mul(group, point, u1, pub_key, u2, ctx)) {
432 ECerr(EC_F_OSSL_ECDSA_VERIFY_SIG, ERR_R_EC_LIB);
433 goto err;
434 }
435 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) ==
436 NID_X9_62_prime_field) {
437 if (!EC_POINT_get_affine_coordinates_GFp(group, point, X, NULL, ctx)) {
438 ECerr(EC_F_OSSL_ECDSA_VERIFY_SIG, ERR_R_EC_LIB);
439 goto err;
440 }
441 }
442#ifndef OPENSSL_NO_EC2M
443 else { /* NID_X9_62_characteristic_two_field */
444
445 if (!EC_POINT_get_affine_coordinates_GF2m(group, point, X, NULL, ctx)) {
446 ECerr(EC_F_OSSL_ECDSA_VERIFY_SIG, ERR_R_EC_LIB);
447 goto err;
448 }
449 }
450#endif
451 if (!BN_nnmod(u1, X, order, ctx)) {
452 ECerr(EC_F_OSSL_ECDSA_VERIFY_SIG, ERR_R_BN_LIB);
453 goto err;
454 }
455 /* if the signature is correct u1 is equal to sig->r */
456 ret = (BN_ucmp(u1, sig->r) == 0);
457 err:
458 BN_CTX_end(ctx);
459 BN_CTX_free(ctx);
460 EC_POINT_free(point);
461 return ret;
462}
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