1 /* $OpenBSD: ec_lib.c,v 1.19 2015/09/10 15:56:25 jsing Exp $ */ 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/opensslconf.h> 67 68 #include <openssl/err.h> 69 #include <openssl/opensslv.h> 70 71 #include "ec_lcl.h" 72 73 /* functions for EC_GROUP objects */ 74 75 EC_GROUP * 76 EC_GROUP_new(const EC_METHOD * meth) 77 { 78 EC_GROUP *ret; 79 80 if (meth == NULL) { 81 ECerr(EC_F_EC_GROUP_NEW, EC_R_SLOT_FULL); 82 return NULL; 83 } 84 if (meth->group_init == 0) { 85 ECerr(EC_F_EC_GROUP_NEW, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 86 return NULL; 87 } 88 ret = malloc(sizeof *ret); 89 if (ret == NULL) { 90 ECerr(EC_F_EC_GROUP_NEW, ERR_R_MALLOC_FAILURE); 91 return NULL; 92 } 93 ret->meth = meth; 94 95 ret->extra_data = NULL; 96 97 ret->generator = NULL; 98 BN_init(&ret->order); 99 BN_init(&ret->cofactor); 100 101 ret->curve_name = 0; 102 ret->asn1_flag = 0; 103 ret->asn1_form = POINT_CONVERSION_UNCOMPRESSED; 104 105 ret->seed = NULL; 106 ret->seed_len = 0; 107 108 if (!meth->group_init(ret)) { 109 free(ret); 110 return NULL; 111 } 112 return ret; 113 } 114 115 116 void 117 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 EC_POINT_free(group->generator); 128 BN_free(&group->order); 129 BN_free(&group->cofactor); 130 131 free(group->seed); 132 133 free(group); 134 } 135 136 137 void 138 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 EC_POINT_clear_free(group->generator); 151 BN_clear_free(&group->order); 152 BN_clear_free(&group->cofactor); 153 154 if (group->seed) { 155 explicit_bzero(group->seed, group->seed_len); 156 free(group->seed); 157 } 158 explicit_bzero(group, sizeof *group); 159 free(group); 160 } 161 162 163 int 164 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(&dest->extra_data, t, d->dup_func, 187 d->free_func, d->clear_free_func)) 188 return 0; 189 } 190 191 if (src->generator != NULL) { 192 if (dest->generator == NULL) { 193 dest->generator = EC_POINT_new(dest); 194 if (dest->generator == NULL) 195 return 0; 196 } 197 if (!EC_POINT_copy(dest->generator, src->generator)) 198 return 0; 199 } else { 200 /* src->generator == NULL */ 201 EC_POINT_clear_free(dest->generator); 202 dest->generator = NULL; 203 } 204 205 if (!BN_copy(&dest->order, &src->order)) 206 return 0; 207 if (!BN_copy(&dest->cofactor, &src->cofactor)) 208 return 0; 209 210 dest->curve_name = src->curve_name; 211 dest->asn1_flag = src->asn1_flag; 212 dest->asn1_form = src->asn1_form; 213 214 if (src->seed) { 215 free(dest->seed); 216 dest->seed = malloc(src->seed_len); 217 if (dest->seed == NULL) 218 return 0; 219 memcpy(dest->seed, src->seed, src->seed_len); 220 dest->seed_len = src->seed_len; 221 } else { 222 free(dest->seed); 223 dest->seed = NULL; 224 dest->seed_len = 0; 225 } 226 227 228 return dest->meth->group_copy(dest, src); 229 } 230 231 232 EC_GROUP * 233 EC_GROUP_dup(const EC_GROUP * a) 234 { 235 EC_GROUP *t = NULL; 236 int ok = 0; 237 238 if (a == NULL) 239 return NULL; 240 241 if ((t = EC_GROUP_new(a->meth)) == NULL) 242 return (NULL); 243 if (!EC_GROUP_copy(t, a)) 244 goto err; 245 246 ok = 1; 247 248 err: 249 if (!ok) { 250 EC_GROUP_free(t); 251 return NULL; 252 } else 253 return t; 254 } 255 256 257 const EC_METHOD * 258 EC_GROUP_method_of(const EC_GROUP *group) 259 { 260 return group->meth; 261 } 262 263 264 int 265 EC_METHOD_get_field_type(const EC_METHOD *meth) 266 { 267 return meth->field_type; 268 } 269 270 271 int 272 EC_GROUP_set_generator(EC_GROUP *group, const EC_POINT *generator, 273 const BIGNUM *order, const BIGNUM *cofactor) 274 { 275 if (generator == NULL) { 276 ECerr(EC_F_EC_GROUP_SET_GENERATOR, ERR_R_PASSED_NULL_PARAMETER); 277 return 0; 278 } 279 if (group->generator == NULL) { 280 group->generator = EC_POINT_new(group); 281 if (group->generator == NULL) 282 return 0; 283 } 284 if (!EC_POINT_copy(group->generator, generator)) 285 return 0; 286 287 if (order != NULL) { 288 if (!BN_copy(&group->order, order)) 289 return 0; 290 } else 291 BN_zero(&group->order); 292 293 if (cofactor != NULL) { 294 if (!BN_copy(&group->cofactor, cofactor)) 295 return 0; 296 } else 297 BN_zero(&group->cofactor); 298 299 return 1; 300 } 301 302 303 const EC_POINT * 304 EC_GROUP_get0_generator(const EC_GROUP *group) 305 { 306 return group->generator; 307 } 308 309 310 int 311 EC_GROUP_get_order(const EC_GROUP *group, BIGNUM *order, BN_CTX *ctx) 312 { 313 if (!BN_copy(order, &group->order)) 314 return 0; 315 316 return !BN_is_zero(order); 317 } 318 319 320 int 321 EC_GROUP_get_cofactor(const EC_GROUP *group, BIGNUM *cofactor, BN_CTX *ctx) 322 { 323 if (!BN_copy(cofactor, &group->cofactor)) 324 return 0; 325 326 return !BN_is_zero(&group->cofactor); 327 } 328 329 330 void 331 EC_GROUP_set_curve_name(EC_GROUP * group, int nid) 332 { 333 group->curve_name = nid; 334 } 335 336 337 int 338 EC_GROUP_get_curve_name(const EC_GROUP * group) 339 { 340 return group->curve_name; 341 } 342 343 344 void 345 EC_GROUP_set_asn1_flag(EC_GROUP * group, int flag) 346 { 347 group->asn1_flag = flag; 348 } 349 350 351 int 352 EC_GROUP_get_asn1_flag(const EC_GROUP * group) 353 { 354 return group->asn1_flag; 355 } 356 357 358 void 359 EC_GROUP_set_point_conversion_form(EC_GROUP * group, 360 point_conversion_form_t form) 361 { 362 group->asn1_form = form; 363 } 364 365 366 point_conversion_form_t 367 EC_GROUP_get_point_conversion_form(const EC_GROUP * group) 368 { 369 return group->asn1_form; 370 } 371 372 373 size_t 374 EC_GROUP_set_seed(EC_GROUP * group, const unsigned char *p, size_t len) 375 { 376 if (group->seed) { 377 free(group->seed); 378 group->seed = NULL; 379 group->seed_len = 0; 380 } 381 if (!len || !p) 382 return 1; 383 384 if ((group->seed = malloc(len)) == NULL) 385 return 0; 386 memcpy(group->seed, p, len); 387 group->seed_len = len; 388 389 return len; 390 } 391 392 393 unsigned char * 394 EC_GROUP_get0_seed(const EC_GROUP * group) 395 { 396 return group->seed; 397 } 398 399 400 size_t 401 EC_GROUP_get_seed_len(const EC_GROUP * group) 402 { 403 return group->seed_len; 404 } 405 406 407 int 408 EC_GROUP_set_curve_GFp(EC_GROUP * group, const BIGNUM * p, const BIGNUM * a, 409 const BIGNUM * b, BN_CTX * ctx) 410 { 411 if (group->meth->group_set_curve == 0) { 412 ECerr(EC_F_EC_GROUP_SET_CURVE_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 413 return 0; 414 } 415 return group->meth->group_set_curve(group, p, a, b, ctx); 416 } 417 418 419 int 420 EC_GROUP_get_curve_GFp(const EC_GROUP * group, BIGNUM * p, BIGNUM * a, 421 BIGNUM * b, BN_CTX * ctx) 422 { 423 if (group->meth->group_get_curve == 0) { 424 ECerr(EC_F_EC_GROUP_GET_CURVE_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 425 return 0; 426 } 427 return group->meth->group_get_curve(group, p, a, b, ctx); 428 } 429 430 #ifndef OPENSSL_NO_EC2M 431 int 432 EC_GROUP_set_curve_GF2m(EC_GROUP * group, const BIGNUM * p, const BIGNUM * a, 433 const BIGNUM * b, BN_CTX * ctx) 434 { 435 if (group->meth->group_set_curve == 0) { 436 ECerr(EC_F_EC_GROUP_SET_CURVE_GF2M, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 437 return 0; 438 } 439 return group->meth->group_set_curve(group, p, a, b, ctx); 440 } 441 442 443 int 444 EC_GROUP_get_curve_GF2m(const EC_GROUP * group, BIGNUM * p, BIGNUM * a, 445 BIGNUM * b, BN_CTX * ctx) 446 { 447 if (group->meth->group_get_curve == 0) { 448 ECerr(EC_F_EC_GROUP_GET_CURVE_GF2M, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 449 return 0; 450 } 451 return group->meth->group_get_curve(group, p, a, b, ctx); 452 } 453 #endif 454 455 int 456 EC_GROUP_get_degree(const EC_GROUP * group) 457 { 458 if (group->meth->group_get_degree == 0) { 459 ECerr(EC_F_EC_GROUP_GET_DEGREE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 460 return 0; 461 } 462 return group->meth->group_get_degree(group); 463 } 464 465 466 int 467 EC_GROUP_check_discriminant(const EC_GROUP * group, BN_CTX * ctx) 468 { 469 if (group->meth->group_check_discriminant == 0) { 470 ECerr(EC_F_EC_GROUP_CHECK_DISCRIMINANT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 471 return 0; 472 } 473 return group->meth->group_check_discriminant(group, ctx); 474 } 475 476 477 int 478 EC_GROUP_cmp(const EC_GROUP * a, const EC_GROUP * b, BN_CTX * ctx) 479 { 480 int r = 0; 481 BIGNUM *a1, *a2, *a3, *b1, *b2, *b3; 482 BN_CTX *ctx_new = NULL; 483 484 /* compare the field types */ 485 if (EC_METHOD_get_field_type(EC_GROUP_method_of(a)) != 486 EC_METHOD_get_field_type(EC_GROUP_method_of(b))) 487 return 1; 488 /* compare the curve name (if present in both) */ 489 if (EC_GROUP_get_curve_name(a) && EC_GROUP_get_curve_name(b) && 490 EC_GROUP_get_curve_name(a) != EC_GROUP_get_curve_name(b)) 491 return 1; 492 493 if (!ctx) 494 ctx_new = ctx = BN_CTX_new(); 495 if (!ctx) 496 return -1; 497 498 BN_CTX_start(ctx); 499 if ((a1 = BN_CTX_get(ctx)) == NULL) 500 goto err; 501 if ((a2 = BN_CTX_get(ctx)) == NULL) 502 goto err; 503 if ((a3 = BN_CTX_get(ctx)) == NULL) 504 goto err; 505 if ((b1 = BN_CTX_get(ctx)) == NULL) 506 goto err; 507 if ((b2 = BN_CTX_get(ctx)) == NULL) 508 goto err; 509 if ((b3 = BN_CTX_get(ctx)) == NULL) 510 goto err; 511 512 /* 513 * XXX This approach assumes that the external representation of 514 * curves over the same field type is the same. 515 */ 516 if (!a->meth->group_get_curve(a, a1, a2, a3, ctx) || 517 !b->meth->group_get_curve(b, b1, b2, b3, ctx)) 518 r = 1; 519 520 if (r || BN_cmp(a1, b1) || BN_cmp(a2, b2) || BN_cmp(a3, b3)) 521 r = 1; 522 523 /* XXX EC_POINT_cmp() assumes that the methods are equal */ 524 if (r || EC_POINT_cmp(a, EC_GROUP_get0_generator(a), 525 EC_GROUP_get0_generator(b), ctx)) 526 r = 1; 527 528 if (!r) { 529 /* compare the order and cofactor */ 530 if (!EC_GROUP_get_order(a, a1, ctx) || 531 !EC_GROUP_get_order(b, b1, ctx) || 532 !EC_GROUP_get_cofactor(a, a2, ctx) || 533 !EC_GROUP_get_cofactor(b, b2, ctx)) 534 goto err; 535 if (BN_cmp(a1, b1) || BN_cmp(a2, b2)) 536 r = 1; 537 } 538 BN_CTX_end(ctx); 539 if (ctx_new) 540 BN_CTX_free(ctx); 541 542 return r; 543 544 err: 545 BN_CTX_end(ctx); 546 if (ctx_new) 547 BN_CTX_free(ctx); 548 return -1; 549 } 550 551 552 /* this has 'package' visibility */ 553 int 554 EC_EX_DATA_set_data(EC_EXTRA_DATA ** ex_data, void *data, 555 void *(*dup_func) (void *), 556 void (*free_func) (void *), 557 void (*clear_free_func) (void *)) 558 { 559 EC_EXTRA_DATA *d; 560 561 if (ex_data == NULL) 562 return 0; 563 564 for (d = *ex_data; d != NULL; d = d->next) { 565 if (d->dup_func == dup_func && d->free_func == free_func && 566 d->clear_free_func == clear_free_func) { 567 ECerr(EC_F_EC_EX_DATA_SET_DATA, EC_R_SLOT_FULL); 568 return 0; 569 } 570 } 571 572 if (data == NULL) 573 /* no explicit entry needed */ 574 return 1; 575 576 d = malloc(sizeof *d); 577 if (d == NULL) 578 return 0; 579 580 d->data = data; 581 d->dup_func = dup_func; 582 d->free_func = free_func; 583 d->clear_free_func = clear_free_func; 584 585 d->next = *ex_data; 586 *ex_data = d; 587 588 return 1; 589 } 590 591 /* this has 'package' visibility */ 592 void * 593 EC_EX_DATA_get_data(const EC_EXTRA_DATA * ex_data, 594 void *(*dup_func) (void *), 595 void (*free_func) (void *), 596 void (*clear_free_func) (void *)) 597 { 598 const EC_EXTRA_DATA *d; 599 600 for (d = ex_data; d != NULL; d = d->next) { 601 if (d->dup_func == dup_func && d->free_func == free_func && d->clear_free_func == clear_free_func) 602 return d->data; 603 } 604 605 return NULL; 606 } 607 608 /* this has 'package' visibility */ 609 void 610 EC_EX_DATA_free_data(EC_EXTRA_DATA ** ex_data, 611 void *(*dup_func) (void *), 612 void (*free_func) (void *), 613 void (*clear_free_func) (void *)) 614 { 615 EC_EXTRA_DATA **p; 616 617 if (ex_data == NULL) 618 return; 619 620 for (p = ex_data; *p != NULL; p = &((*p)->next)) { 621 if ((*p)->dup_func == dup_func && 622 (*p)->free_func == free_func && 623 (*p)->clear_free_func == clear_free_func) { 624 EC_EXTRA_DATA *next = (*p)->next; 625 626 (*p)->free_func((*p)->data); 627 free(*p); 628 629 *p = next; 630 return; 631 } 632 } 633 } 634 635 /* this has 'package' visibility */ 636 void 637 EC_EX_DATA_clear_free_data(EC_EXTRA_DATA ** ex_data, 638 void *(*dup_func) (void *), 639 void (*free_func) (void *), 640 void (*clear_free_func) (void *)) 641 { 642 EC_EXTRA_DATA **p; 643 644 if (ex_data == NULL) 645 return; 646 647 for (p = ex_data; *p != NULL; p = &((*p)->next)) { 648 if ((*p)->dup_func == dup_func && 649 (*p)->free_func == free_func && 650 (*p)->clear_free_func == clear_free_func) { 651 EC_EXTRA_DATA *next = (*p)->next; 652 653 (*p)->clear_free_func((*p)->data); 654 free(*p); 655 656 *p = next; 657 return; 658 } 659 } 660 } 661 662 /* this has 'package' visibility */ 663 void 664 EC_EX_DATA_free_all_data(EC_EXTRA_DATA ** ex_data) 665 { 666 EC_EXTRA_DATA *d; 667 668 if (ex_data == NULL) 669 return; 670 671 d = *ex_data; 672 while (d) { 673 EC_EXTRA_DATA *next = d->next; 674 675 d->free_func(d->data); 676 free(d); 677 678 d = next; 679 } 680 *ex_data = NULL; 681 } 682 683 /* this has 'package' visibility */ 684 void 685 EC_EX_DATA_clear_free_all_data(EC_EXTRA_DATA ** ex_data) 686 { 687 EC_EXTRA_DATA *d; 688 689 if (ex_data == NULL) 690 return; 691 692 d = *ex_data; 693 while (d) { 694 EC_EXTRA_DATA *next = d->next; 695 696 d->clear_free_func(d->data); 697 free(d); 698 699 d = next; 700 } 701 *ex_data = NULL; 702 } 703 704 705 /* functions for EC_POINT objects */ 706 707 EC_POINT * 708 EC_POINT_new(const EC_GROUP * group) 709 { 710 EC_POINT *ret; 711 712 if (group == NULL) { 713 ECerr(EC_F_EC_POINT_NEW, ERR_R_PASSED_NULL_PARAMETER); 714 return NULL; 715 } 716 if (group->meth->point_init == 0) { 717 ECerr(EC_F_EC_POINT_NEW, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 718 return NULL; 719 } 720 ret = malloc(sizeof *ret); 721 if (ret == NULL) { 722 ECerr(EC_F_EC_POINT_NEW, ERR_R_MALLOC_FAILURE); 723 return NULL; 724 } 725 ret->meth = group->meth; 726 727 if (!ret->meth->point_init(ret)) { 728 free(ret); 729 return NULL; 730 } 731 return ret; 732 } 733 734 735 void 736 EC_POINT_free(EC_POINT * point) 737 { 738 if (!point) 739 return; 740 741 if (point->meth->point_finish != 0) 742 point->meth->point_finish(point); 743 free(point); 744 } 745 746 747 void 748 EC_POINT_clear_free(EC_POINT * point) 749 { 750 if (!point) 751 return; 752 753 if (point->meth->point_clear_finish != 0) 754 point->meth->point_clear_finish(point); 755 else if (point->meth->point_finish != 0) 756 point->meth->point_finish(point); 757 explicit_bzero(point, sizeof *point); 758 free(point); 759 } 760 761 762 int 763 EC_POINT_copy(EC_POINT * dest, const EC_POINT * src) 764 { 765 if (dest->meth->point_copy == 0) { 766 ECerr(EC_F_EC_POINT_COPY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 767 return 0; 768 } 769 if (dest->meth != src->meth) { 770 ECerr(EC_F_EC_POINT_COPY, EC_R_INCOMPATIBLE_OBJECTS); 771 return 0; 772 } 773 if (dest == src) 774 return 1; 775 return dest->meth->point_copy(dest, src); 776 } 777 778 779 EC_POINT * 780 EC_POINT_dup(const EC_POINT * a, const EC_GROUP * group) 781 { 782 EC_POINT *t; 783 int r; 784 785 if (a == NULL) 786 return NULL; 787 788 t = EC_POINT_new(group); 789 if (t == NULL) 790 return (NULL); 791 r = EC_POINT_copy(t, a); 792 if (!r) { 793 EC_POINT_free(t); 794 return NULL; 795 } else 796 return t; 797 } 798 799 800 const EC_METHOD * 801 EC_POINT_method_of(const EC_POINT * point) 802 { 803 return point->meth; 804 } 805 806 807 int 808 EC_POINT_set_to_infinity(const EC_GROUP * group, EC_POINT * point) 809 { 810 if (group->meth->point_set_to_infinity == 0) { 811 ECerr(EC_F_EC_POINT_SET_TO_INFINITY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 812 return 0; 813 } 814 if (group->meth != point->meth) { 815 ECerr(EC_F_EC_POINT_SET_TO_INFINITY, EC_R_INCOMPATIBLE_OBJECTS); 816 return 0; 817 } 818 return group->meth->point_set_to_infinity(group, point); 819 } 820 821 822 int 823 EC_POINT_set_Jprojective_coordinates_GFp(const EC_GROUP *group, EC_POINT *point, 824 const BIGNUM *x, const BIGNUM *y, const BIGNUM *z, BN_CTX *ctx) 825 { 826 if (group->meth->point_set_Jprojective_coordinates_GFp == 0) { 827 ECerr(EC_F_EC_POINT_SET_JPROJECTIVE_COORDINATES_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 828 return 0; 829 } 830 if (group->meth != point->meth) { 831 ECerr(EC_F_EC_POINT_SET_JPROJECTIVE_COORDINATES_GFP, EC_R_INCOMPATIBLE_OBJECTS); 832 return 0; 833 } 834 return group->meth->point_set_Jprojective_coordinates_GFp(group, point, x, y, z, ctx); 835 } 836 837 838 int 839 EC_POINT_get_Jprojective_coordinates_GFp(const EC_GROUP *group, 840 const EC_POINT *point, BIGNUM *x, BIGNUM *y, BIGNUM *z, BN_CTX *ctx) 841 { 842 if (group->meth->point_get_Jprojective_coordinates_GFp == 0) { 843 ECerr(EC_F_EC_POINT_GET_JPROJECTIVE_COORDINATES_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 844 return 0; 845 } 846 if (group->meth != point->meth) { 847 ECerr(EC_F_EC_POINT_GET_JPROJECTIVE_COORDINATES_GFP, EC_R_INCOMPATIBLE_OBJECTS); 848 return 0; 849 } 850 return group->meth->point_get_Jprojective_coordinates_GFp(group, point, x, y, z, ctx); 851 } 852 853 854 int 855 EC_POINT_set_affine_coordinates_GFp(const EC_GROUP *group, EC_POINT *point, 856 const BIGNUM *x, const BIGNUM *y, BN_CTX *ctx) 857 { 858 if (group->meth->point_set_affine_coordinates == 0) { 859 ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 860 return 0; 861 } 862 if (group->meth != point->meth) { 863 ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GFP, EC_R_INCOMPATIBLE_OBJECTS); 864 return 0; 865 } 866 return group->meth->point_set_affine_coordinates(group, point, x, y, ctx); 867 } 868 869 #ifndef OPENSSL_NO_EC2M 870 int 871 EC_POINT_set_affine_coordinates_GF2m(const EC_GROUP *group, EC_POINT *point, 872 const BIGNUM *x, const BIGNUM *y, BN_CTX *ctx) 873 { 874 if (group->meth->point_set_affine_coordinates == 0) { 875 ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GF2M, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 876 return 0; 877 } 878 if (group->meth != point->meth) { 879 ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GF2M, EC_R_INCOMPATIBLE_OBJECTS); 880 return 0; 881 } 882 return group->meth->point_set_affine_coordinates(group, point, x, y, ctx); 883 } 884 #endif 885 886 int 887 EC_POINT_get_affine_coordinates_GFp(const EC_GROUP *group, const EC_POINT *point, 888 BIGNUM *x, BIGNUM *y, BN_CTX *ctx) 889 { 890 if (group->meth->point_get_affine_coordinates == 0) { 891 ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 892 return 0; 893 } 894 if (group->meth != point->meth) { 895 ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GFP, EC_R_INCOMPATIBLE_OBJECTS); 896 return 0; 897 } 898 return group->meth->point_get_affine_coordinates(group, point, x, y, ctx); 899 } 900 901 #ifndef OPENSSL_NO_EC2M 902 int 903 EC_POINT_get_affine_coordinates_GF2m(const EC_GROUP *group, const EC_POINT *point, 904 BIGNUM *x, BIGNUM *y, BN_CTX *ctx) 905 { 906 if (group->meth->point_get_affine_coordinates == 0) { 907 ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GF2M, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 908 return 0; 909 } 910 if (group->meth != point->meth) { 911 ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GF2M, EC_R_INCOMPATIBLE_OBJECTS); 912 return 0; 913 } 914 return group->meth->point_get_affine_coordinates(group, point, x, y, ctx); 915 } 916 #endif 917 918 int 919 EC_POINT_add(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a, 920 const EC_POINT *b, BN_CTX *ctx) 921 { 922 if (group->meth->add == 0) { 923 ECerr(EC_F_EC_POINT_ADD, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 924 return 0; 925 } 926 if ((group->meth != r->meth) || (r->meth != a->meth) || (a->meth != b->meth)) { 927 ECerr(EC_F_EC_POINT_ADD, EC_R_INCOMPATIBLE_OBJECTS); 928 return 0; 929 } 930 return group->meth->add(group, r, a, b, ctx); 931 } 932 933 934 int 935 EC_POINT_dbl(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a, BN_CTX *ctx) 936 { 937 if (group->meth->dbl == 0) { 938 ECerr(EC_F_EC_POINT_DBL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 939 return 0; 940 } 941 if ((group->meth != r->meth) || (r->meth != a->meth)) { 942 ECerr(EC_F_EC_POINT_DBL, EC_R_INCOMPATIBLE_OBJECTS); 943 return 0; 944 } 945 return group->meth->dbl(group, r, a, ctx); 946 } 947 948 949 int 950 EC_POINT_invert(const EC_GROUP *group, EC_POINT *a, BN_CTX *ctx) 951 { 952 if (group->meth->invert == 0) { 953 ECerr(EC_F_EC_POINT_INVERT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 954 return 0; 955 } 956 if (group->meth != a->meth) { 957 ECerr(EC_F_EC_POINT_INVERT, EC_R_INCOMPATIBLE_OBJECTS); 958 return 0; 959 } 960 return group->meth->invert(group, a, ctx); 961 } 962 963 964 int 965 EC_POINT_is_at_infinity(const EC_GROUP *group, const EC_POINT *point) 966 { 967 if (group->meth->is_at_infinity == 0) { 968 ECerr(EC_F_EC_POINT_IS_AT_INFINITY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 969 return 0; 970 } 971 if (group->meth != point->meth) { 972 ECerr(EC_F_EC_POINT_IS_AT_INFINITY, EC_R_INCOMPATIBLE_OBJECTS); 973 return 0; 974 } 975 return group->meth->is_at_infinity(group, point); 976 } 977 978 979 int 980 EC_POINT_is_on_curve(const EC_GROUP * group, const EC_POINT * point, BN_CTX * ctx) 981 { 982 if (group->meth->is_on_curve == 0) { 983 ECerr(EC_F_EC_POINT_IS_ON_CURVE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 984 return 0; 985 } 986 if (group->meth != point->meth) { 987 ECerr(EC_F_EC_POINT_IS_ON_CURVE, EC_R_INCOMPATIBLE_OBJECTS); 988 return 0; 989 } 990 return group->meth->is_on_curve(group, point, ctx); 991 } 992 993 994 int 995 EC_POINT_cmp(const EC_GROUP *group, const EC_POINT *a, const EC_POINT *b, 996 BN_CTX * ctx) 997 { 998 if (group->meth->point_cmp == 0) { 999 ECerr(EC_F_EC_POINT_CMP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 1000 return -1; 1001 } 1002 if ((group->meth != a->meth) || (a->meth != b->meth)) { 1003 ECerr(EC_F_EC_POINT_CMP, EC_R_INCOMPATIBLE_OBJECTS); 1004 return -1; 1005 } 1006 return group->meth->point_cmp(group, a, b, ctx); 1007 } 1008 1009 1010 int 1011 EC_POINT_make_affine(const EC_GROUP *group, EC_POINT *point, BN_CTX *ctx) 1012 { 1013 if (group->meth->make_affine == 0) { 1014 ECerr(EC_F_EC_POINT_MAKE_AFFINE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 1015 return 0; 1016 } 1017 if (group->meth != point->meth) { 1018 ECerr(EC_F_EC_POINT_MAKE_AFFINE, EC_R_INCOMPATIBLE_OBJECTS); 1019 return 0; 1020 } 1021 return group->meth->make_affine(group, point, ctx); 1022 } 1023 1024 1025 int 1026 EC_POINTs_make_affine(const EC_GROUP *group, size_t num, EC_POINT *points[], 1027 BN_CTX *ctx) 1028 { 1029 size_t i; 1030 1031 if (group->meth->points_make_affine == 0) { 1032 ECerr(EC_F_EC_POINTS_MAKE_AFFINE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 1033 return 0; 1034 } 1035 for (i = 0; i < num; i++) { 1036 if (group->meth != points[i]->meth) { 1037 ECerr(EC_F_EC_POINTS_MAKE_AFFINE, EC_R_INCOMPATIBLE_OBJECTS); 1038 return 0; 1039 } 1040 } 1041 return group->meth->points_make_affine(group, num, points, ctx); 1042 } 1043 1044 1045 /* Functions for point multiplication. 1046 * 1047 * If group->meth->mul is 0, we use the wNAF-based implementations in ec_mult.c; 1048 * otherwise we dispatch through methods. 1049 */ 1050 1051 int 1052 EC_POINTs_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *scalar, 1053 size_t num, const EC_POINT *points[], const BIGNUM *scalars[], BN_CTX *ctx) 1054 { 1055 if (group->meth->mul == 0) 1056 /* use default */ 1057 return ec_wNAF_mul(group, r, scalar, num, points, scalars, ctx); 1058 1059 return group->meth->mul(group, r, scalar, num, points, scalars, ctx); 1060 } 1061 1062 int 1063 EC_POINT_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *g_scalar, 1064 const EC_POINT *point, const BIGNUM *p_scalar, BN_CTX *ctx) 1065 { 1066 /* just a convenient interface to EC_POINTs_mul() */ 1067 1068 const EC_POINT *points[1]; 1069 const BIGNUM *scalars[1]; 1070 1071 points[0] = point; 1072 scalars[0] = p_scalar; 1073 1074 return EC_POINTs_mul(group, r, g_scalar, 1075 (point != NULL && p_scalar != NULL), 1076 points, scalars, ctx); 1077 } 1078 1079 int 1080 EC_GROUP_precompute_mult(EC_GROUP * group, BN_CTX * ctx) 1081 { 1082 if (group->meth->mul == 0) 1083 /* use default */ 1084 return ec_wNAF_precompute_mult(group, ctx); 1085 1086 if (group->meth->precompute_mult != 0) 1087 return group->meth->precompute_mult(group, ctx); 1088 else 1089 return 1; /* nothing to do, so report success */ 1090 } 1091 1092 int 1093 EC_GROUP_have_precompute_mult(const EC_GROUP * group) 1094 { 1095 if (group->meth->mul == 0) 1096 /* use default */ 1097 return ec_wNAF_have_precompute_mult(group); 1098 1099 if (group->meth->have_precompute_mult != 0) 1100 return group->meth->have_precompute_mult(group); 1101 else 1102 return 0; /* cannot tell whether precomputation has 1103 * been performed */ 1104 } 1105 1106 EC_KEY * 1107 ECParameters_dup(EC_KEY *key) 1108 { 1109 unsigned char *p = NULL; 1110 EC_KEY *k = NULL; 1111 int len; 1112 1113 if (key == NULL) 1114 return (NULL); 1115 1116 if ((len = i2d_ECParameters(key, &p)) > 0) 1117 k = d2i_ECParameters(NULL, (const unsigned char **)&p, len); 1118 1119 return (k); 1120 } 1121