ec_lib.c revision 296341
1/* crypto/ec/ec_lib.c */ 2/* 3 * Originally written by Bodo Moeller for the OpenSSL project. 4 */ 5/* ==================================================================== 6 * Copyright (c) 1998-2003 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 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED. 60 * Binary polynomial ECC support in OpenSSL originally developed by 61 * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project. 62 */ 63 64#include <string.h> 65 66#include <openssl/err.h> 67#include <openssl/opensslv.h> 68 69#include "ec_lcl.h" 70 71const char EC_version[] = "EC" OPENSSL_VERSION_PTEXT; 72 73/* functions for EC_GROUP objects */ 74 75EC_GROUP *EC_GROUP_new(const EC_METHOD *meth) 76{ 77 EC_GROUP *ret; 78 79 if (meth == NULL) { 80 ECerr(EC_F_EC_GROUP_NEW, EC_R_SLOT_FULL); 81 return NULL; 82 } 83 if (meth->group_init == 0) { 84 ECerr(EC_F_EC_GROUP_NEW, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 85 return NULL; 86 } 87 88 ret = OPENSSL_malloc(sizeof *ret); 89 if (ret == NULL) { 90 ECerr(EC_F_EC_GROUP_NEW, ERR_R_MALLOC_FAILURE); 91 return NULL; 92 } 93 94 ret->meth = meth; 95 96 ret->extra_data = NULL; 97 98 ret->generator = NULL; 99 BN_init(&ret->order); 100 BN_init(&ret->cofactor); 101 102 ret->curve_name = 0; 103 ret->asn1_flag = 0; 104 ret->asn1_form = POINT_CONVERSION_UNCOMPRESSED; 105 106 ret->seed = NULL; 107 ret->seed_len = 0; 108 109 if (!meth->group_init(ret)) { 110 OPENSSL_free(ret); 111 return NULL; 112 } 113 114 return ret; 115} 116 117void EC_GROUP_free(EC_GROUP *group) 118{ 119 if (!group) 120 return; 121 122 if (group->meth->group_finish != 0) 123 group->meth->group_finish(group); 124 125 EC_EX_DATA_free_all_data(&group->extra_data); 126 127 if (group->generator != NULL) 128 EC_POINT_free(group->generator); 129 BN_free(&group->order); 130 BN_free(&group->cofactor); 131 132 if (group->seed) 133 OPENSSL_free(group->seed); 134 135 OPENSSL_free(group); 136} 137 138void EC_GROUP_clear_free(EC_GROUP *group) 139{ 140 if (!group) 141 return; 142 143 if (group->meth->group_clear_finish != 0) 144 group->meth->group_clear_finish(group); 145 else if (group->meth->group_finish != 0) 146 group->meth->group_finish(group); 147 148 EC_EX_DATA_clear_free_all_data(&group->extra_data); 149 150 if (group->generator != NULL) 151 EC_POINT_clear_free(group->generator); 152 BN_clear_free(&group->order); 153 BN_clear_free(&group->cofactor); 154 155 if (group->seed) { 156 OPENSSL_cleanse(group->seed, group->seed_len); 157 OPENSSL_free(group->seed); 158 } 159 160 OPENSSL_cleanse(group, sizeof *group); 161 OPENSSL_free(group); 162} 163 164int EC_GROUP_copy(EC_GROUP *dest, const EC_GROUP *src) 165{ 166 EC_EXTRA_DATA *d; 167 168 if (dest->meth->group_copy == 0) { 169 ECerr(EC_F_EC_GROUP_COPY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 170 return 0; 171 } 172 if (dest->meth != src->meth) { 173 ECerr(EC_F_EC_GROUP_COPY, EC_R_INCOMPATIBLE_OBJECTS); 174 return 0; 175 } 176 if (dest == src) 177 return 1; 178 179 EC_EX_DATA_free_all_data(&dest->extra_data); 180 181 for (d = src->extra_data; d != NULL; d = d->next) { 182 void *t = d->dup_func(d->data); 183 184 if (t == NULL) 185 return 0; 186 if (!EC_EX_DATA_set_data 187 (&dest->extra_data, t, d->dup_func, d->free_func, 188 d->clear_free_func)) 189 return 0; 190 } 191 192 if (src->generator != NULL) { 193 if (dest->generator == NULL) { 194 dest->generator = EC_POINT_new(dest); 195 if (dest->generator == NULL) 196 return 0; 197 } 198 if (!EC_POINT_copy(dest->generator, src->generator)) 199 return 0; 200 } else { 201 /* src->generator == NULL */ 202 if (dest->generator != NULL) { 203 EC_POINT_clear_free(dest->generator); 204 dest->generator = NULL; 205 } 206 } 207 208 if (!BN_copy(&dest->order, &src->order)) 209 return 0; 210 if (!BN_copy(&dest->cofactor, &src->cofactor)) 211 return 0; 212 213 dest->curve_name = src->curve_name; 214 dest->asn1_flag = src->asn1_flag; 215 dest->asn1_form = src->asn1_form; 216 217 if (src->seed) { 218 if (dest->seed) 219 OPENSSL_free(dest->seed); 220 dest->seed = OPENSSL_malloc(src->seed_len); 221 if (dest->seed == NULL) 222 return 0; 223 if (!memcpy(dest->seed, src->seed, src->seed_len)) 224 return 0; 225 dest->seed_len = src->seed_len; 226 } else { 227 if (dest->seed) 228 OPENSSL_free(dest->seed); 229 dest->seed = NULL; 230 dest->seed_len = 0; 231 } 232 233 return dest->meth->group_copy(dest, src); 234} 235 236EC_GROUP *EC_GROUP_dup(const EC_GROUP *a) 237{ 238 EC_GROUP *t = NULL; 239 int ok = 0; 240 241 if (a == NULL) 242 return NULL; 243 244 if ((t = EC_GROUP_new(a->meth)) == NULL) 245 return (NULL); 246 if (!EC_GROUP_copy(t, a)) 247 goto err; 248 249 ok = 1; 250 251 err: 252 if (!ok) { 253 if (t) 254 EC_GROUP_free(t); 255 return NULL; 256 } else 257 return t; 258} 259 260const EC_METHOD *EC_GROUP_method_of(const EC_GROUP *group) 261{ 262 return group->meth; 263} 264 265int EC_METHOD_get_field_type(const EC_METHOD *meth) 266{ 267 return meth->field_type; 268} 269 270int EC_GROUP_set_generator(EC_GROUP *group, const EC_POINT *generator, 271 const BIGNUM *order, const BIGNUM *cofactor) 272{ 273 if (generator == NULL) { 274 ECerr(EC_F_EC_GROUP_SET_GENERATOR, ERR_R_PASSED_NULL_PARAMETER); 275 return 0; 276 } 277 278 if (group->generator == NULL) { 279 group->generator = EC_POINT_new(group); 280 if (group->generator == NULL) 281 return 0; 282 } 283 if (!EC_POINT_copy(group->generator, generator)) 284 return 0; 285 286 if (order != NULL) { 287 if (!BN_copy(&group->order, order)) 288 return 0; 289 } else 290 BN_zero(&group->order); 291 292 if (cofactor != NULL) { 293 if (!BN_copy(&group->cofactor, cofactor)) 294 return 0; 295 } else 296 BN_zero(&group->cofactor); 297 298 return 1; 299} 300 301const EC_POINT *EC_GROUP_get0_generator(const EC_GROUP *group) 302{ 303 return group->generator; 304} 305 306int EC_GROUP_get_order(const EC_GROUP *group, BIGNUM *order, BN_CTX *ctx) 307{ 308 if (!BN_copy(order, &group->order)) 309 return 0; 310 311 return !BN_is_zero(order); 312} 313 314int EC_GROUP_get_cofactor(const EC_GROUP *group, BIGNUM *cofactor, 315 BN_CTX *ctx) 316{ 317 if (!BN_copy(cofactor, &group->cofactor)) 318 return 0; 319 320 return !BN_is_zero(&group->cofactor); 321} 322 323void EC_GROUP_set_curve_name(EC_GROUP *group, int nid) 324{ 325 group->curve_name = nid; 326} 327 328int EC_GROUP_get_curve_name(const EC_GROUP *group) 329{ 330 return group->curve_name; 331} 332 333void EC_GROUP_set_asn1_flag(EC_GROUP *group, int flag) 334{ 335 group->asn1_flag = flag; 336} 337 338int EC_GROUP_get_asn1_flag(const EC_GROUP *group) 339{ 340 return group->asn1_flag; 341} 342 343void EC_GROUP_set_point_conversion_form(EC_GROUP *group, 344 point_conversion_form_t form) 345{ 346 group->asn1_form = form; 347} 348 349point_conversion_form_t EC_GROUP_get_point_conversion_form(const EC_GROUP 350 *group) 351{ 352 return group->asn1_form; 353} 354 355size_t EC_GROUP_set_seed(EC_GROUP *group, const unsigned char *p, size_t len) 356{ 357 if (group->seed) { 358 OPENSSL_free(group->seed); 359 group->seed = NULL; 360 group->seed_len = 0; 361 } 362 363 if (!len || !p) 364 return 1; 365 366 if ((group->seed = OPENSSL_malloc(len)) == NULL) 367 return 0; 368 memcpy(group->seed, p, len); 369 group->seed_len = len; 370 371 return len; 372} 373 374unsigned char *EC_GROUP_get0_seed(const EC_GROUP *group) 375{ 376 return group->seed; 377} 378 379size_t EC_GROUP_get_seed_len(const EC_GROUP *group) 380{ 381 return group->seed_len; 382} 383 384int EC_GROUP_set_curve_GFp(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a, 385 const BIGNUM *b, BN_CTX *ctx) 386{ 387 if (group->meth->group_set_curve == 0) { 388 ECerr(EC_F_EC_GROUP_SET_CURVE_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 389 return 0; 390 } 391 return group->meth->group_set_curve(group, p, a, b, ctx); 392} 393 394int EC_GROUP_get_curve_GFp(const EC_GROUP *group, BIGNUM *p, BIGNUM *a, 395 BIGNUM *b, BN_CTX *ctx) 396{ 397 if (group->meth->group_get_curve == 0) { 398 ECerr(EC_F_EC_GROUP_GET_CURVE_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 399 return 0; 400 } 401 return group->meth->group_get_curve(group, p, a, b, ctx); 402} 403 404#ifndef OPENSSL_NO_EC2M 405int EC_GROUP_set_curve_GF2m(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a, 406 const BIGNUM *b, BN_CTX *ctx) 407{ 408 if (group->meth->group_set_curve == 0) { 409 ECerr(EC_F_EC_GROUP_SET_CURVE_GF2M, 410 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 411 return 0; 412 } 413 return group->meth->group_set_curve(group, p, a, b, ctx); 414} 415 416int EC_GROUP_get_curve_GF2m(const EC_GROUP *group, BIGNUM *p, BIGNUM *a, 417 BIGNUM *b, BN_CTX *ctx) 418{ 419 if (group->meth->group_get_curve == 0) { 420 ECerr(EC_F_EC_GROUP_GET_CURVE_GF2M, 421 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 422 return 0; 423 } 424 return group->meth->group_get_curve(group, p, a, b, ctx); 425} 426#endif 427 428int EC_GROUP_get_degree(const EC_GROUP *group) 429{ 430 if (group->meth->group_get_degree == 0) { 431 ECerr(EC_F_EC_GROUP_GET_DEGREE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 432 return 0; 433 } 434 return group->meth->group_get_degree(group); 435} 436 437int EC_GROUP_check_discriminant(const EC_GROUP *group, BN_CTX *ctx) 438{ 439 if (group->meth->group_check_discriminant == 0) { 440 ECerr(EC_F_EC_GROUP_CHECK_DISCRIMINANT, 441 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 442 return 0; 443 } 444 return group->meth->group_check_discriminant(group, ctx); 445} 446 447int EC_GROUP_cmp(const EC_GROUP *a, const EC_GROUP *b, BN_CTX *ctx) 448{ 449 int r = 0; 450 BIGNUM *a1, *a2, *a3, *b1, *b2, *b3; 451 BN_CTX *ctx_new = NULL; 452 453 /* compare the field types */ 454 if (EC_METHOD_get_field_type(EC_GROUP_method_of(a)) != 455 EC_METHOD_get_field_type(EC_GROUP_method_of(b))) 456 return 1; 457 /* compare the curve name (if present in both) */ 458 if (EC_GROUP_get_curve_name(a) && EC_GROUP_get_curve_name(b) && 459 EC_GROUP_get_curve_name(a) != EC_GROUP_get_curve_name(b)) 460 return 1; 461 462 if (!ctx) 463 ctx_new = ctx = BN_CTX_new(); 464 if (!ctx) 465 return -1; 466 467 BN_CTX_start(ctx); 468 a1 = BN_CTX_get(ctx); 469 a2 = BN_CTX_get(ctx); 470 a3 = BN_CTX_get(ctx); 471 b1 = BN_CTX_get(ctx); 472 b2 = BN_CTX_get(ctx); 473 b3 = BN_CTX_get(ctx); 474 if (!b3) { 475 BN_CTX_end(ctx); 476 if (ctx_new) 477 BN_CTX_free(ctx); 478 return -1; 479 } 480 481 /* 482 * XXX This approach assumes that the external representation of curves 483 * over the same field type is the same. 484 */ 485 if (!a->meth->group_get_curve(a, a1, a2, a3, ctx) || 486 !b->meth->group_get_curve(b, b1, b2, b3, ctx)) 487 r = 1; 488 489 if (r || BN_cmp(a1, b1) || BN_cmp(a2, b2) || BN_cmp(a3, b3)) 490 r = 1; 491 492 /* XXX EC_POINT_cmp() assumes that the methods are equal */ 493 if (r || EC_POINT_cmp(a, EC_GROUP_get0_generator(a), 494 EC_GROUP_get0_generator(b), ctx)) 495 r = 1; 496 497 if (!r) { 498 /* compare the order and cofactor */ 499 if (!EC_GROUP_get_order(a, a1, ctx) || 500 !EC_GROUP_get_order(b, b1, ctx) || 501 !EC_GROUP_get_cofactor(a, a2, ctx) || 502 !EC_GROUP_get_cofactor(b, b2, ctx)) { 503 BN_CTX_end(ctx); 504 if (ctx_new) 505 BN_CTX_free(ctx); 506 return -1; 507 } 508 if (BN_cmp(a1, b1) || BN_cmp(a2, b2)) 509 r = 1; 510 } 511 512 BN_CTX_end(ctx); 513 if (ctx_new) 514 BN_CTX_free(ctx); 515 516 return r; 517} 518 519/* this has 'package' visibility */ 520int EC_EX_DATA_set_data(EC_EXTRA_DATA **ex_data, void *data, 521 void *(*dup_func) (void *), 522 void (*free_func) (void *), 523 void (*clear_free_func) (void *)) 524{ 525 EC_EXTRA_DATA *d; 526 527 if (ex_data == NULL) 528 return 0; 529 530 for (d = *ex_data; d != NULL; d = d->next) { 531 if (d->dup_func == dup_func && d->free_func == free_func 532 && d->clear_free_func == clear_free_func) { 533 ECerr(EC_F_EC_EX_DATA_SET_DATA, EC_R_SLOT_FULL); 534 return 0; 535 } 536 } 537 538 if (data == NULL) 539 /* no explicit entry needed */ 540 return 1; 541 542 d = OPENSSL_malloc(sizeof *d); 543 if (d == NULL) 544 return 0; 545 546 d->data = data; 547 d->dup_func = dup_func; 548 d->free_func = free_func; 549 d->clear_free_func = clear_free_func; 550 551 d->next = *ex_data; 552 *ex_data = d; 553 554 return 1; 555} 556 557/* this has 'package' visibility */ 558void *EC_EX_DATA_get_data(const EC_EXTRA_DATA *ex_data, 559 void *(*dup_func) (void *), 560 void (*free_func) (void *), 561 void (*clear_free_func) (void *)) 562{ 563 const EC_EXTRA_DATA *d; 564 565 for (d = ex_data; d != NULL; d = d->next) { 566 if (d->dup_func == dup_func && d->free_func == free_func 567 && d->clear_free_func == clear_free_func) 568 return d->data; 569 } 570 571 return NULL; 572} 573 574/* this has 'package' visibility */ 575void EC_EX_DATA_free_data(EC_EXTRA_DATA **ex_data, 576 void *(*dup_func) (void *), 577 void (*free_func) (void *), 578 void (*clear_free_func) (void *)) 579{ 580 EC_EXTRA_DATA **p; 581 582 if (ex_data == NULL) 583 return; 584 585 for (p = ex_data; *p != NULL; p = &((*p)->next)) { 586 if ((*p)->dup_func == dup_func && (*p)->free_func == free_func 587 && (*p)->clear_free_func == clear_free_func) { 588 EC_EXTRA_DATA *next = (*p)->next; 589 590 (*p)->free_func((*p)->data); 591 OPENSSL_free(*p); 592 593 *p = next; 594 return; 595 } 596 } 597} 598 599/* this has 'package' visibility */ 600void EC_EX_DATA_clear_free_data(EC_EXTRA_DATA **ex_data, 601 void *(*dup_func) (void *), 602 void (*free_func) (void *), 603 void (*clear_free_func) (void *)) 604{ 605 EC_EXTRA_DATA **p; 606 607 if (ex_data == NULL) 608 return; 609 610 for (p = ex_data; *p != NULL; p = &((*p)->next)) { 611 if ((*p)->dup_func == dup_func && (*p)->free_func == free_func 612 && (*p)->clear_free_func == clear_free_func) { 613 EC_EXTRA_DATA *next = (*p)->next; 614 615 (*p)->clear_free_func((*p)->data); 616 OPENSSL_free(*p); 617 618 *p = next; 619 return; 620 } 621 } 622} 623 624/* this has 'package' visibility */ 625void EC_EX_DATA_free_all_data(EC_EXTRA_DATA **ex_data) 626{ 627 EC_EXTRA_DATA *d; 628 629 if (ex_data == NULL) 630 return; 631 632 d = *ex_data; 633 while (d) { 634 EC_EXTRA_DATA *next = d->next; 635 636 d->free_func(d->data); 637 OPENSSL_free(d); 638 639 d = next; 640 } 641 *ex_data = NULL; 642} 643 644/* this has 'package' visibility */ 645void EC_EX_DATA_clear_free_all_data(EC_EXTRA_DATA **ex_data) 646{ 647 EC_EXTRA_DATA *d; 648 649 if (ex_data == NULL) 650 return; 651 652 d = *ex_data; 653 while (d) { 654 EC_EXTRA_DATA *next = d->next; 655 656 d->clear_free_func(d->data); 657 OPENSSL_free(d); 658 659 d = next; 660 } 661 *ex_data = NULL; 662} 663 664/* functions for EC_POINT objects */ 665 666EC_POINT *EC_POINT_new(const EC_GROUP *group) 667{ 668 EC_POINT *ret; 669 670 if (group == NULL) { 671 ECerr(EC_F_EC_POINT_NEW, ERR_R_PASSED_NULL_PARAMETER); 672 return NULL; 673 } 674 if (group->meth->point_init == 0) { 675 ECerr(EC_F_EC_POINT_NEW, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 676 return NULL; 677 } 678 679 ret = OPENSSL_malloc(sizeof *ret); 680 if (ret == NULL) { 681 ECerr(EC_F_EC_POINT_NEW, ERR_R_MALLOC_FAILURE); 682 return NULL; 683 } 684 685 ret->meth = group->meth; 686 687 if (!ret->meth->point_init(ret)) { 688 OPENSSL_free(ret); 689 return NULL; 690 } 691 692 return ret; 693} 694 695void EC_POINT_free(EC_POINT *point) 696{ 697 if (!point) 698 return; 699 700 if (point->meth->point_finish != 0) 701 point->meth->point_finish(point); 702 OPENSSL_free(point); 703} 704 705void EC_POINT_clear_free(EC_POINT *point) 706{ 707 if (!point) 708 return; 709 710 if (point->meth->point_clear_finish != 0) 711 point->meth->point_clear_finish(point); 712 else if (point->meth->point_finish != 0) 713 point->meth->point_finish(point); 714 OPENSSL_cleanse(point, sizeof *point); 715 OPENSSL_free(point); 716} 717 718int EC_POINT_copy(EC_POINT *dest, const EC_POINT *src) 719{ 720 if (dest->meth->point_copy == 0) { 721 ECerr(EC_F_EC_POINT_COPY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 722 return 0; 723 } 724 if (dest->meth != src->meth) { 725 ECerr(EC_F_EC_POINT_COPY, EC_R_INCOMPATIBLE_OBJECTS); 726 return 0; 727 } 728 if (dest == src) 729 return 1; 730 return dest->meth->point_copy(dest, src); 731} 732 733EC_POINT *EC_POINT_dup(const EC_POINT *a, const EC_GROUP *group) 734{ 735 EC_POINT *t; 736 int r; 737 738 if (a == NULL) 739 return NULL; 740 741 t = EC_POINT_new(group); 742 if (t == NULL) 743 return (NULL); 744 r = EC_POINT_copy(t, a); 745 if (!r) { 746 EC_POINT_free(t); 747 return NULL; 748 } else 749 return t; 750} 751 752const EC_METHOD *EC_POINT_method_of(const EC_POINT *point) 753{ 754 return point->meth; 755} 756 757int EC_POINT_set_to_infinity(const EC_GROUP *group, EC_POINT *point) 758{ 759 if (group->meth->point_set_to_infinity == 0) { 760 ECerr(EC_F_EC_POINT_SET_TO_INFINITY, 761 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 762 return 0; 763 } 764 if (group->meth != point->meth) { 765 ECerr(EC_F_EC_POINT_SET_TO_INFINITY, EC_R_INCOMPATIBLE_OBJECTS); 766 return 0; 767 } 768 return group->meth->point_set_to_infinity(group, point); 769} 770 771int EC_POINT_set_Jprojective_coordinates_GFp(const EC_GROUP *group, 772 EC_POINT *point, const BIGNUM *x, 773 const BIGNUM *y, const BIGNUM *z, 774 BN_CTX *ctx) 775{ 776 if (group->meth->point_set_Jprojective_coordinates_GFp == 0) { 777 ECerr(EC_F_EC_POINT_SET_JPROJECTIVE_COORDINATES_GFP, 778 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 779 return 0; 780 } 781 if (group->meth != point->meth) { 782 ECerr(EC_F_EC_POINT_SET_JPROJECTIVE_COORDINATES_GFP, 783 EC_R_INCOMPATIBLE_OBJECTS); 784 return 0; 785 } 786 return group->meth->point_set_Jprojective_coordinates_GFp(group, point, x, 787 y, z, ctx); 788} 789 790int EC_POINT_get_Jprojective_coordinates_GFp(const EC_GROUP *group, 791 const EC_POINT *point, BIGNUM *x, 792 BIGNUM *y, BIGNUM *z, 793 BN_CTX *ctx) 794{ 795 if (group->meth->point_get_Jprojective_coordinates_GFp == 0) { 796 ECerr(EC_F_EC_POINT_GET_JPROJECTIVE_COORDINATES_GFP, 797 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 798 return 0; 799 } 800 if (group->meth != point->meth) { 801 ECerr(EC_F_EC_POINT_GET_JPROJECTIVE_COORDINATES_GFP, 802 EC_R_INCOMPATIBLE_OBJECTS); 803 return 0; 804 } 805 return group->meth->point_get_Jprojective_coordinates_GFp(group, point, x, 806 y, z, ctx); 807} 808 809int EC_POINT_set_affine_coordinates_GFp(const EC_GROUP *group, 810 EC_POINT *point, const BIGNUM *x, 811 const BIGNUM *y, BN_CTX *ctx) 812{ 813 if (group->meth->point_set_affine_coordinates == 0) { 814 ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GFP, 815 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 816 return 0; 817 } 818 if (group->meth != point->meth) { 819 ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GFP, 820 EC_R_INCOMPATIBLE_OBJECTS); 821 return 0; 822 } 823 return group->meth->point_set_affine_coordinates(group, point, x, y, ctx); 824} 825 826#ifndef OPENSSL_NO_EC2M 827int EC_POINT_set_affine_coordinates_GF2m(const EC_GROUP *group, 828 EC_POINT *point, const BIGNUM *x, 829 const BIGNUM *y, BN_CTX *ctx) 830{ 831 if (group->meth->point_set_affine_coordinates == 0) { 832 ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GF2M, 833 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 834 return 0; 835 } 836 if (group->meth != point->meth) { 837 ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GF2M, 838 EC_R_INCOMPATIBLE_OBJECTS); 839 return 0; 840 } 841 return group->meth->point_set_affine_coordinates(group, point, x, y, ctx); 842} 843#endif 844 845int EC_POINT_get_affine_coordinates_GFp(const EC_GROUP *group, 846 const EC_POINT *point, BIGNUM *x, 847 BIGNUM *y, BN_CTX *ctx) 848{ 849 if (group->meth->point_get_affine_coordinates == 0) { 850 ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GFP, 851 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 852 return 0; 853 } 854 if (group->meth != point->meth) { 855 ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GFP, 856 EC_R_INCOMPATIBLE_OBJECTS); 857 return 0; 858 } 859 return group->meth->point_get_affine_coordinates(group, point, x, y, ctx); 860} 861 862#ifndef OPENSSL_NO_EC2M 863int EC_POINT_get_affine_coordinates_GF2m(const EC_GROUP *group, 864 const EC_POINT *point, BIGNUM *x, 865 BIGNUM *y, BN_CTX *ctx) 866{ 867 if (group->meth->point_get_affine_coordinates == 0) { 868 ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GF2M, 869 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 870 return 0; 871 } 872 if (group->meth != point->meth) { 873 ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GF2M, 874 EC_R_INCOMPATIBLE_OBJECTS); 875 return 0; 876 } 877 return group->meth->point_get_affine_coordinates(group, point, x, y, ctx); 878} 879#endif 880 881int EC_POINT_add(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a, 882 const EC_POINT *b, BN_CTX *ctx) 883{ 884 if (group->meth->add == 0) { 885 ECerr(EC_F_EC_POINT_ADD, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 886 return 0; 887 } 888 if ((group->meth != r->meth) || (r->meth != a->meth) 889 || (a->meth != b->meth)) { 890 ECerr(EC_F_EC_POINT_ADD, EC_R_INCOMPATIBLE_OBJECTS); 891 return 0; 892 } 893 return group->meth->add(group, r, a, b, ctx); 894} 895 896int EC_POINT_dbl(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a, 897 BN_CTX *ctx) 898{ 899 if (group->meth->dbl == 0) { 900 ECerr(EC_F_EC_POINT_DBL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 901 return 0; 902 } 903 if ((group->meth != r->meth) || (r->meth != a->meth)) { 904 ECerr(EC_F_EC_POINT_DBL, EC_R_INCOMPATIBLE_OBJECTS); 905 return 0; 906 } 907 return group->meth->dbl(group, r, a, ctx); 908} 909 910int EC_POINT_invert(const EC_GROUP *group, EC_POINT *a, BN_CTX *ctx) 911{ 912 if (group->meth->invert == 0) { 913 ECerr(EC_F_EC_POINT_INVERT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 914 return 0; 915 } 916 if (group->meth != a->meth) { 917 ECerr(EC_F_EC_POINT_INVERT, EC_R_INCOMPATIBLE_OBJECTS); 918 return 0; 919 } 920 return group->meth->invert(group, a, ctx); 921} 922 923int EC_POINT_is_at_infinity(const EC_GROUP *group, const EC_POINT *point) 924{ 925 if (group->meth->is_at_infinity == 0) { 926 ECerr(EC_F_EC_POINT_IS_AT_INFINITY, 927 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 928 return 0; 929 } 930 if (group->meth != point->meth) { 931 ECerr(EC_F_EC_POINT_IS_AT_INFINITY, EC_R_INCOMPATIBLE_OBJECTS); 932 return 0; 933 } 934 return group->meth->is_at_infinity(group, point); 935} 936 937/* 938 * Check whether an EC_POINT is on the curve or not. Note that the return 939 * value for this function should NOT be treated as a boolean. Return values: 940 * 1: The point is on the curve 941 * 0: The point is not on the curve 942 * -1: An error occurred 943 */ 944int EC_POINT_is_on_curve(const EC_GROUP *group, const EC_POINT *point, 945 BN_CTX *ctx) 946{ 947 if (group->meth->is_on_curve == 0) { 948 ECerr(EC_F_EC_POINT_IS_ON_CURVE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 949 return 0; 950 } 951 if (group->meth != point->meth) { 952 ECerr(EC_F_EC_POINT_IS_ON_CURVE, EC_R_INCOMPATIBLE_OBJECTS); 953 return 0; 954 } 955 return group->meth->is_on_curve(group, point, ctx); 956} 957 958int EC_POINT_cmp(const EC_GROUP *group, const EC_POINT *a, const EC_POINT *b, 959 BN_CTX *ctx) 960{ 961 if (group->meth->point_cmp == 0) { 962 ECerr(EC_F_EC_POINT_CMP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 963 return -1; 964 } 965 if ((group->meth != a->meth) || (a->meth != b->meth)) { 966 ECerr(EC_F_EC_POINT_CMP, EC_R_INCOMPATIBLE_OBJECTS); 967 return -1; 968 } 969 return group->meth->point_cmp(group, a, b, ctx); 970} 971 972int EC_POINT_make_affine(const EC_GROUP *group, EC_POINT *point, BN_CTX *ctx) 973{ 974 if (group->meth->make_affine == 0) { 975 ECerr(EC_F_EC_POINT_MAKE_AFFINE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 976 return 0; 977 } 978 if (group->meth != point->meth) { 979 ECerr(EC_F_EC_POINT_MAKE_AFFINE, EC_R_INCOMPATIBLE_OBJECTS); 980 return 0; 981 } 982 return group->meth->make_affine(group, point, ctx); 983} 984 985int EC_POINTs_make_affine(const EC_GROUP *group, size_t num, 986 EC_POINT *points[], BN_CTX *ctx) 987{ 988 size_t i; 989 990 if (group->meth->points_make_affine == 0) { 991 ECerr(EC_F_EC_POINTS_MAKE_AFFINE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 992 return 0; 993 } 994 for (i = 0; i < num; i++) { 995 if (group->meth != points[i]->meth) { 996 ECerr(EC_F_EC_POINTS_MAKE_AFFINE, EC_R_INCOMPATIBLE_OBJECTS); 997 return 0; 998 } 999 } 1000 return group->meth->points_make_affine(group, num, points, ctx); 1001} 1002 1003/* 1004 * Functions for point multiplication. If group->meth->mul is 0, we use the 1005 * wNAF-based implementations in ec_mult.c; otherwise we dispatch through 1006 * methods. 1007 */ 1008 1009int EC_POINTs_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *scalar, 1010 size_t num, const EC_POINT *points[], 1011 const BIGNUM *scalars[], BN_CTX *ctx) 1012{ 1013 if (group->meth->mul == 0) 1014 /* use default */ 1015 return ec_wNAF_mul(group, r, scalar, num, points, scalars, ctx); 1016 1017 return group->meth->mul(group, r, scalar, num, points, scalars, ctx); 1018} 1019 1020int EC_POINT_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *g_scalar, 1021 const EC_POINT *point, const BIGNUM *p_scalar, BN_CTX *ctx) 1022{ 1023 /* just a convenient interface to EC_POINTs_mul() */ 1024 1025 const EC_POINT *points[1]; 1026 const BIGNUM *scalars[1]; 1027 1028 points[0] = point; 1029 scalars[0] = p_scalar; 1030 1031 return EC_POINTs_mul(group, r, g_scalar, 1032 (point != NULL 1033 && p_scalar != NULL), points, scalars, ctx); 1034} 1035 1036int EC_GROUP_precompute_mult(EC_GROUP *group, BN_CTX *ctx) 1037{ 1038 if (group->meth->mul == 0) 1039 /* use default */ 1040 return ec_wNAF_precompute_mult(group, ctx); 1041 1042 if (group->meth->precompute_mult != 0) 1043 return group->meth->precompute_mult(group, ctx); 1044 else 1045 return 1; /* nothing to do, so report success */ 1046} 1047 1048int EC_GROUP_have_precompute_mult(const EC_GROUP *group) 1049{ 1050 if (group->meth->mul == 0) 1051 /* use default */ 1052 return ec_wNAF_have_precompute_mult(group); 1053 1054 if (group->meth->have_precompute_mult != 0) 1055 return group->meth->have_precompute_mult(group); 1056 else 1057 return 0; /* cannot tell whether precomputation has 1058 * been performed */ 1059} 1060