1160814Ssimon/* crypto/ecdsa/ecs_ossl.c */ 2160814Ssimon/* 3160814Ssimon * Written by Nils Larsch for the OpenSSL project 4160814Ssimon */ 5160814Ssimon/* ==================================================================== 6160814Ssimon * Copyright (c) 1998-2004 The OpenSSL Project. All rights reserved. 7160814Ssimon * 8160814Ssimon * Redistribution and use in source and binary forms, with or without 9160814Ssimon * modification, are permitted provided that the following conditions 10160814Ssimon * are met: 11160814Ssimon * 12160814Ssimon * 1. Redistributions of source code must retain the above copyright 13280304Sjkim * notice, this list of conditions and the following disclaimer. 14160814Ssimon * 15160814Ssimon * 2. Redistributions in binary form must reproduce the above copyright 16160814Ssimon * notice, this list of conditions and the following disclaimer in 17160814Ssimon * the documentation and/or other materials provided with the 18160814Ssimon * distribution. 19160814Ssimon * 20160814Ssimon * 3. All advertising materials mentioning features or use of this 21160814Ssimon * software must display the following acknowledgment: 22160814Ssimon * "This product includes software developed by the OpenSSL Project 23160814Ssimon * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 24160814Ssimon * 25160814Ssimon * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 26160814Ssimon * endorse or promote products derived from this software without 27160814Ssimon * prior written permission. For written permission, please contact 28160814Ssimon * openssl-core@OpenSSL.org. 29160814Ssimon * 30160814Ssimon * 5. Products derived from this software may not be called "OpenSSL" 31160814Ssimon * nor may "OpenSSL" appear in their names without prior written 32160814Ssimon * permission of the OpenSSL Project. 33160814Ssimon * 34160814Ssimon * 6. Redistributions of any form whatsoever must retain the following 35160814Ssimon * acknowledgment: 36160814Ssimon * "This product includes software developed by the OpenSSL Project 37160814Ssimon * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 38160814Ssimon * 39160814Ssimon * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 40160814Ssimon * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 41160814Ssimon * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 42160814Ssimon * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 43160814Ssimon * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 44160814Ssimon * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 45160814Ssimon * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 46160814Ssimon * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47160814Ssimon * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 48160814Ssimon * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 49160814Ssimon * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 50160814Ssimon * OF THE POSSIBILITY OF SUCH DAMAGE. 51160814Ssimon * ==================================================================== 52160814Ssimon * 53160814Ssimon * This product includes cryptographic software written by Eric Young 54160814Ssimon * (eay@cryptsoft.com). This product includes software written by Tim 55160814Ssimon * Hudson (tjh@cryptsoft.com). 56160814Ssimon * 57160814Ssimon */ 58160814Ssimon 59160814Ssimon#include "ecs_locl.h" 60160814Ssimon#include <openssl/err.h> 61160814Ssimon#include <openssl/obj_mac.h> 62160814Ssimon#include <openssl/bn.h> 63160814Ssimon 64280304Sjkimstatic ECDSA_SIG *ecdsa_do_sign(const unsigned char *dgst, int dlen, 65280304Sjkim const BIGNUM *, const BIGNUM *, 66280304Sjkim EC_KEY *eckey); 67280304Sjkimstatic int ecdsa_sign_setup(EC_KEY *eckey, BN_CTX *ctx_in, BIGNUM **kinvp, 68280304Sjkim BIGNUM **rp); 69280304Sjkimstatic int ecdsa_do_verify(const unsigned char *dgst, int dgst_len, 70280304Sjkim const ECDSA_SIG *sig, EC_KEY *eckey); 71160814Ssimon 72160814Ssimonstatic ECDSA_METHOD openssl_ecdsa_meth = { 73280304Sjkim "OpenSSL ECDSA method", 74280304Sjkim ecdsa_do_sign, 75280304Sjkim ecdsa_sign_setup, 76280304Sjkim ecdsa_do_verify, 77160814Ssimon#if 0 78280304Sjkim NULL, /* init */ 79280304Sjkim NULL, /* finish */ 80160814Ssimon#endif 81280304Sjkim 0, /* flags */ 82280304Sjkim NULL /* app_data */ 83160814Ssimon}; 84160814Ssimon 85160814Ssimonconst ECDSA_METHOD *ECDSA_OpenSSL(void) 86160814Ssimon{ 87280304Sjkim return &openssl_ecdsa_meth; 88160814Ssimon} 89160814Ssimon 90160814Ssimonstatic int ecdsa_sign_setup(EC_KEY *eckey, BN_CTX *ctx_in, BIGNUM **kinvp, 91280304Sjkim BIGNUM **rp) 92160814Ssimon{ 93280304Sjkim BN_CTX *ctx = NULL; 94280304Sjkim BIGNUM *k = NULL, *r = NULL, *order = NULL, *X = NULL; 95280304Sjkim EC_POINT *tmp_point = NULL; 96280304Sjkim const EC_GROUP *group; 97280304Sjkim int ret = 0; 98160814Ssimon 99280304Sjkim if (eckey == NULL || (group = EC_KEY_get0_group(eckey)) == NULL) { 100280304Sjkim ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_PASSED_NULL_PARAMETER); 101280304Sjkim return 0; 102280304Sjkim } 103160814Ssimon 104280304Sjkim if (ctx_in == NULL) { 105280304Sjkim if ((ctx = BN_CTX_new()) == NULL) { 106280304Sjkim ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_MALLOC_FAILURE); 107280304Sjkim return 0; 108280304Sjkim } 109280304Sjkim } else 110280304Sjkim ctx = ctx_in; 111160814Ssimon 112280304Sjkim k = BN_new(); /* this value is later returned in *kinvp */ 113280304Sjkim r = BN_new(); /* this value is later returned in *rp */ 114280304Sjkim order = BN_new(); 115280304Sjkim X = BN_new(); 116280304Sjkim if (!k || !r || !order || !X) { 117280304Sjkim ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_MALLOC_FAILURE); 118280304Sjkim goto err; 119280304Sjkim } 120280304Sjkim if ((tmp_point = EC_POINT_new(group)) == NULL) { 121280304Sjkim ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_EC_LIB); 122280304Sjkim goto err; 123280304Sjkim } 124280304Sjkim if (!EC_GROUP_get_order(group, order, ctx)) { 125280304Sjkim ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_EC_LIB); 126280304Sjkim goto err; 127280304Sjkim } 128160814Ssimon 129280304Sjkim do { 130280304Sjkim /* get random k */ 131280304Sjkim do 132280304Sjkim if (!BN_rand_range(k, order)) { 133280304Sjkim ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, 134280304Sjkim ECDSA_R_RANDOM_NUMBER_GENERATION_FAILED); 135280304Sjkim goto err; 136280304Sjkim } 137280304Sjkim while (BN_is_zero(k)) ; 138237657Sjkim 139280304Sjkim /* 140280304Sjkim * We do not want timing information to leak the length of k, so we 141280304Sjkim * compute G*k using an equivalent scalar of fixed bit-length. 142280304Sjkim */ 143237657Sjkim 144280304Sjkim if (!BN_add(k, k, order)) 145280304Sjkim goto err; 146280304Sjkim if (BN_num_bits(k) <= BN_num_bits(order)) 147280304Sjkim if (!BN_add(k, k, order)) 148280304Sjkim goto err; 149280304Sjkim 150280304Sjkim /* compute r the x-coordinate of generator * k */ 151280304Sjkim if (!EC_POINT_mul(group, tmp_point, k, NULL, NULL, ctx)) { 152280304Sjkim ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_EC_LIB); 153280304Sjkim goto err; 154280304Sjkim } 155280304Sjkim if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) == 156280304Sjkim NID_X9_62_prime_field) { 157280304Sjkim if (!EC_POINT_get_affine_coordinates_GFp 158280304Sjkim (group, tmp_point, X, NULL, ctx)) { 159280304Sjkim ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_EC_LIB); 160280304Sjkim goto err; 161280304Sjkim } 162280304Sjkim } 163238405Sjkim#ifndef OPENSSL_NO_EC2M 164280304Sjkim else { /* NID_X9_62_characteristic_two_field */ 165280304Sjkim 166280304Sjkim if (!EC_POINT_get_affine_coordinates_GF2m(group, 167280304Sjkim tmp_point, X, NULL, 168280304Sjkim ctx)) { 169280304Sjkim ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_EC_LIB); 170280304Sjkim goto err; 171280304Sjkim } 172280304Sjkim } 173238405Sjkim#endif 174280304Sjkim if (!BN_nnmod(r, X, order, ctx)) { 175280304Sjkim ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_BN_LIB); 176280304Sjkim goto err; 177280304Sjkim } 178280304Sjkim } 179280304Sjkim while (BN_is_zero(r)); 180160814Ssimon 181280304Sjkim /* compute the inverse of k */ 182280304Sjkim if (!BN_mod_inverse(k, k, order, ctx)) { 183280304Sjkim ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_BN_LIB); 184280304Sjkim goto err; 185280304Sjkim } 186280304Sjkim /* clear old values if necessary */ 187280304Sjkim if (*rp != NULL) 188280304Sjkim BN_clear_free(*rp); 189280304Sjkim if (*kinvp != NULL) 190280304Sjkim BN_clear_free(*kinvp); 191280304Sjkim /* save the pre-computed values */ 192280304Sjkim *rp = r; 193280304Sjkim *kinvp = k; 194280304Sjkim ret = 1; 195280304Sjkim err: 196280304Sjkim if (!ret) { 197280304Sjkim if (k != NULL) 198280304Sjkim BN_clear_free(k); 199280304Sjkim if (r != NULL) 200280304Sjkim BN_clear_free(r); 201280304Sjkim } 202280304Sjkim if (ctx_in == NULL) 203280304Sjkim BN_CTX_free(ctx); 204280304Sjkim if (order != NULL) 205280304Sjkim BN_free(order); 206280304Sjkim if (tmp_point != NULL) 207280304Sjkim EC_POINT_free(tmp_point); 208280304Sjkim if (X) 209280304Sjkim BN_clear_free(X); 210280304Sjkim return (ret); 211160814Ssimon} 212160814Ssimon 213280304Sjkimstatic ECDSA_SIG *ecdsa_do_sign(const unsigned char *dgst, int dgst_len, 214280304Sjkim const BIGNUM *in_kinv, const BIGNUM *in_r, 215280304Sjkim EC_KEY *eckey) 216160814Ssimon{ 217280304Sjkim int ok = 0, i; 218280304Sjkim BIGNUM *kinv = NULL, *s, *m = NULL, *tmp = NULL, *order = NULL; 219280304Sjkim const BIGNUM *ckinv; 220280304Sjkim BN_CTX *ctx = NULL; 221280304Sjkim const EC_GROUP *group; 222280304Sjkim ECDSA_SIG *ret; 223280304Sjkim ECDSA_DATA *ecdsa; 224280304Sjkim const BIGNUM *priv_key; 225160814Ssimon 226280304Sjkim ecdsa = ecdsa_check(eckey); 227280304Sjkim group = EC_KEY_get0_group(eckey); 228280304Sjkim priv_key = EC_KEY_get0_private_key(eckey); 229160814Ssimon 230280304Sjkim if (group == NULL || priv_key == NULL || ecdsa == NULL) { 231280304Sjkim ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_PASSED_NULL_PARAMETER); 232280304Sjkim return NULL; 233280304Sjkim } 234160814Ssimon 235280304Sjkim ret = ECDSA_SIG_new(); 236280304Sjkim if (!ret) { 237280304Sjkim ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_MALLOC_FAILURE); 238280304Sjkim return NULL; 239280304Sjkim } 240280304Sjkim s = ret->s; 241160814Ssimon 242280304Sjkim if ((ctx = BN_CTX_new()) == NULL || (order = BN_new()) == NULL || 243280304Sjkim (tmp = BN_new()) == NULL || (m = BN_new()) == NULL) { 244280304Sjkim ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_MALLOC_FAILURE); 245280304Sjkim goto err; 246280304Sjkim } 247160814Ssimon 248280304Sjkim if (!EC_GROUP_get_order(group, order, ctx)) { 249280304Sjkim ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_EC_LIB); 250280304Sjkim goto err; 251280304Sjkim } 252280304Sjkim i = BN_num_bits(order); 253280304Sjkim /* 254280304Sjkim * Need to truncate digest if it is too long: first truncate whole bytes. 255280304Sjkim */ 256280304Sjkim if (8 * dgst_len > i) 257280304Sjkim dgst_len = (i + 7) / 8; 258280304Sjkim if (!BN_bin2bn(dgst, dgst_len, m)) { 259280304Sjkim ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_BN_LIB); 260280304Sjkim goto err; 261280304Sjkim } 262280304Sjkim /* If still too long truncate remaining bits with a shift */ 263280304Sjkim if ((8 * dgst_len > i) && !BN_rshift(m, m, 8 - (i & 0x7))) { 264280304Sjkim ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_BN_LIB); 265280304Sjkim goto err; 266280304Sjkim } 267280304Sjkim do { 268280304Sjkim if (in_kinv == NULL || in_r == NULL) { 269280304Sjkim if (!ECDSA_sign_setup(eckey, ctx, &kinv, &ret->r)) { 270280304Sjkim ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_ECDSA_LIB); 271280304Sjkim goto err; 272280304Sjkim } 273280304Sjkim ckinv = kinv; 274280304Sjkim } else { 275280304Sjkim ckinv = in_kinv; 276280304Sjkim if (BN_copy(ret->r, in_r) == NULL) { 277280304Sjkim ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_MALLOC_FAILURE); 278280304Sjkim goto err; 279280304Sjkim } 280280304Sjkim } 281160814Ssimon 282280304Sjkim if (!BN_mod_mul(tmp, priv_key, ret->r, order, ctx)) { 283280304Sjkim ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_BN_LIB); 284280304Sjkim goto err; 285280304Sjkim } 286280304Sjkim if (!BN_mod_add_quick(s, tmp, m, order)) { 287280304Sjkim ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_BN_LIB); 288280304Sjkim goto err; 289280304Sjkim } 290280304Sjkim if (!BN_mod_mul(s, s, ckinv, order, ctx)) { 291280304Sjkim ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_BN_LIB); 292280304Sjkim goto err; 293280304Sjkim } 294280304Sjkim if (BN_is_zero(s)) { 295280304Sjkim /* 296280304Sjkim * if kinv and r have been supplied by the caller don't to 297280304Sjkim * generate new kinv and r values 298280304Sjkim */ 299280304Sjkim if (in_kinv != NULL && in_r != NULL) { 300280304Sjkim ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, 301280304Sjkim ECDSA_R_NEED_NEW_SETUP_VALUES); 302280304Sjkim goto err; 303280304Sjkim } 304280304Sjkim } else 305280304Sjkim /* s != 0 => we have a valid signature */ 306280304Sjkim break; 307280304Sjkim } 308280304Sjkim while (1); 309280304Sjkim 310280304Sjkim ok = 1; 311280304Sjkim err: 312280304Sjkim if (!ok) { 313280304Sjkim ECDSA_SIG_free(ret); 314280304Sjkim ret = NULL; 315280304Sjkim } 316280304Sjkim if (ctx) 317280304Sjkim BN_CTX_free(ctx); 318280304Sjkim if (m) 319280304Sjkim BN_clear_free(m); 320280304Sjkim if (tmp) 321280304Sjkim BN_clear_free(tmp); 322280304Sjkim if (order) 323280304Sjkim BN_free(order); 324280304Sjkim if (kinv) 325280304Sjkim BN_clear_free(kinv); 326280304Sjkim return ret; 327160814Ssimon} 328160814Ssimon 329160814Ssimonstatic int ecdsa_do_verify(const unsigned char *dgst, int dgst_len, 330280304Sjkim const ECDSA_SIG *sig, EC_KEY *eckey) 331160814Ssimon{ 332280304Sjkim int ret = -1, i; 333280304Sjkim BN_CTX *ctx; 334280304Sjkim BIGNUM *order, *u1, *u2, *m, *X; 335280304Sjkim EC_POINT *point = NULL; 336280304Sjkim const EC_GROUP *group; 337280304Sjkim const EC_POINT *pub_key; 338160814Ssimon 339280304Sjkim /* check input values */ 340280304Sjkim if (eckey == NULL || (group = EC_KEY_get0_group(eckey)) == NULL || 341280304Sjkim (pub_key = EC_KEY_get0_public_key(eckey)) == NULL || sig == NULL) { 342280304Sjkim ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ECDSA_R_MISSING_PARAMETERS); 343280304Sjkim return -1; 344280304Sjkim } 345160814Ssimon 346280304Sjkim ctx = BN_CTX_new(); 347280304Sjkim if (!ctx) { 348280304Sjkim ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_MALLOC_FAILURE); 349280304Sjkim return -1; 350280304Sjkim } 351280304Sjkim BN_CTX_start(ctx); 352280304Sjkim order = BN_CTX_get(ctx); 353280304Sjkim u1 = BN_CTX_get(ctx); 354280304Sjkim u2 = BN_CTX_get(ctx); 355280304Sjkim m = BN_CTX_get(ctx); 356280304Sjkim X = BN_CTX_get(ctx); 357280304Sjkim if (!X) { 358280304Sjkim ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_BN_LIB); 359280304Sjkim goto err; 360280304Sjkim } 361160814Ssimon 362280304Sjkim if (!EC_GROUP_get_order(group, order, ctx)) { 363280304Sjkim ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_EC_LIB); 364280304Sjkim goto err; 365280304Sjkim } 366160814Ssimon 367280304Sjkim if (BN_is_zero(sig->r) || BN_is_negative(sig->r) || 368280304Sjkim BN_ucmp(sig->r, order) >= 0 || BN_is_zero(sig->s) || 369280304Sjkim BN_is_negative(sig->s) || BN_ucmp(sig->s, order) >= 0) { 370280304Sjkim ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ECDSA_R_BAD_SIGNATURE); 371280304Sjkim ret = 0; /* signature is invalid */ 372280304Sjkim goto err; 373280304Sjkim } 374280304Sjkim /* calculate tmp1 = inv(S) mod order */ 375280304Sjkim if (!BN_mod_inverse(u2, sig->s, order, ctx)) { 376280304Sjkim ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_BN_LIB); 377280304Sjkim goto err; 378280304Sjkim } 379280304Sjkim /* digest -> m */ 380280304Sjkim i = BN_num_bits(order); 381280304Sjkim /* 382280304Sjkim * Need to truncate digest if it is too long: first truncate whole bytes. 383280304Sjkim */ 384280304Sjkim if (8 * dgst_len > i) 385280304Sjkim dgst_len = (i + 7) / 8; 386280304Sjkim if (!BN_bin2bn(dgst, dgst_len, m)) { 387280304Sjkim ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_BN_LIB); 388280304Sjkim goto err; 389280304Sjkim } 390280304Sjkim /* If still too long truncate remaining bits with a shift */ 391280304Sjkim if ((8 * dgst_len > i) && !BN_rshift(m, m, 8 - (i & 0x7))) { 392280304Sjkim ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_BN_LIB); 393280304Sjkim goto err; 394280304Sjkim } 395280304Sjkim /* u1 = m * tmp mod order */ 396280304Sjkim if (!BN_mod_mul(u1, m, u2, order, ctx)) { 397280304Sjkim ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_BN_LIB); 398280304Sjkim goto err; 399280304Sjkim } 400280304Sjkim /* u2 = r * w mod q */ 401280304Sjkim if (!BN_mod_mul(u2, sig->r, u2, order, ctx)) { 402280304Sjkim ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_BN_LIB); 403280304Sjkim goto err; 404280304Sjkim } 405280304Sjkim 406280304Sjkim if ((point = EC_POINT_new(group)) == NULL) { 407280304Sjkim ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_MALLOC_FAILURE); 408280304Sjkim goto err; 409280304Sjkim } 410280304Sjkim if (!EC_POINT_mul(group, point, u1, pub_key, u2, ctx)) { 411280304Sjkim ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_EC_LIB); 412280304Sjkim goto err; 413280304Sjkim } 414280304Sjkim if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) == 415280304Sjkim NID_X9_62_prime_field) { 416280304Sjkim if (!EC_POINT_get_affine_coordinates_GFp(group, point, X, NULL, ctx)) { 417280304Sjkim ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_EC_LIB); 418280304Sjkim goto err; 419280304Sjkim } 420280304Sjkim } 421238405Sjkim#ifndef OPENSSL_NO_EC2M 422280304Sjkim else { /* NID_X9_62_characteristic_two_field */ 423280304Sjkim 424280304Sjkim if (!EC_POINT_get_affine_coordinates_GF2m(group, point, X, NULL, ctx)) { 425280304Sjkim ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_EC_LIB); 426280304Sjkim goto err; 427280304Sjkim } 428280304Sjkim } 429280304Sjkim#endif 430280304Sjkim if (!BN_nnmod(u1, X, order, ctx)) { 431280304Sjkim ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_BN_LIB); 432280304Sjkim goto err; 433280304Sjkim } 434280304Sjkim /* if the signature is correct u1 is equal to sig->r */ 435280304Sjkim ret = (BN_ucmp(u1, sig->r) == 0); 436280304Sjkim err: 437280304Sjkim BN_CTX_end(ctx); 438280304Sjkim BN_CTX_free(ctx); 439280304Sjkim if (point) 440280304Sjkim EC_POINT_free(point); 441280304Sjkim return ret; 442160814Ssimon} 443