crypto/ec/ec_lib.c

   1 /* crypto/ec/ec_lib.c */
   2 /* ====================================================================
   3  * Copyright (c) 1998-2001 The OpenSSL Project.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  *
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in
  14  *    the documentation and/or other materials provided with the
  15  *    distribution.
  16  *
  17  * 3. All advertising materials mentioning features or use of this
  18  *    software must display the following acknowledgment:
  19  *    "This product includes software developed by the OpenSSL Project
  20  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  21  *
  22  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  23  *    endorse or promote products derived from this software without
  24  *    prior written permission. For written permission, please contact
  25  *    openssl-core@openssl.org.
  26  *
  27  * 5. Products derived from this software may not be called "OpenSSL"
  28  *    nor may "OpenSSL" appear in their names without prior written
  29  *    permission of the OpenSSL Project.
  30  *
  31  * 6. Redistributions of any form whatsoever must retain the following
  32  *    acknowledgment:
  33  *    "This product includes software developed by the OpenSSL Project
  34  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  35  *
  36  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  37  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  38  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  39  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  40  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  41  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  42  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  43  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  44  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  45  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  46  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  47  * OF THE POSSIBILITY OF SUCH DAMAGE.
  48  * ====================================================================
  49  *
  50  * This product includes cryptographic software written by Eric Young
  51  * (eay@cryptsoft.com).  This product includes software written by Tim
  52  * Hudson (tjh@cryptsoft.com).
  53  *
  54  */
  55
  56 #include <string.h>
  57
  58 #include <openssl/err.h>
  59
  60 #include "ec_lcl.h"
  61
  62
  63 /* functions for EC_GROUP objects */
  64
  65 EC_GROUP *EC_GROUP_new(const EC_METHOD *meth)
  66         {
  67         EC_GROUP *ret;
  68
  69         if (meth == NULL)
  70                 {
  71                 ECerr(EC_F_EC_GROUP_NEW, ERR_R_PASSED_NULL_PARAMETER);
  72                 return NULL;
  73                 }
  74         if (meth->group_init == 0)
  75                 {
  76                 ECerr(EC_F_EC_GROUP_NEW, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
  77                 return NULL;
  78                 }
  79
  80         ret = OPENSSL_malloc(sizeof *ret);
  81         if (ret == NULL)
  82                 {
  83                 ECerr(EC_F_EC_GROUP_NEW, ERR_R_MALLOC_FAILURE);
  84                 return NULL;
  85                 }
  86
  87         ret->meth = meth;
  88
  89         ret->extra_data = NULL;
  90         ret->extra_data_dup_func = 0;
  91         ret->extra_data_free_func = 0;
  92         ret->extra_data_clear_free_func = 0;
  93
  94         if (!meth->group_init(ret))
  95                 {
  96                 OPENSSL_free(ret);
  97                 return NULL;
  98                 }
  99
 100         return ret;
 101         }
 102
 103
 104 int EC_GROUP_set_curve_GFp(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
 105         {
 106         if (group->meth->group_set_curve_GFp == 0)
 107                 {
 108                 ECerr(EC_F_EC_GROUP_SET_CURVE_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
 109                 return 0;
 110                 }
 111         return group->meth->group_set_curve_GFp(group, p, a, b, ctx);
 112         }
 113
 114
 115 void EC_GROUP_free(EC_GROUP *group)
 116         {
 117         if (group->meth->group_finish != 0)
 118                 group->meth->group_finish(group);
 119
 120         EC_GROUP_free_extra_data(group);
 121
 122         OPENSSL_free(group);
 123         }
 124
 125
 126 void EC_GROUP_clear_free(EC_GROUP *group)
 127         {
 128         if (group->meth->group_clear_finish != 0)
 129                 group->meth->group_clear_finish(group);
 130         else if (group->meth != NULL && group->meth->group_finish != 0)
 131                 group->meth->group_finish(group);
 132
 133         EC_GROUP_clear_free_extra_data(group);
 134
 135         memset(group, 0, sizeof *group);
 136         OPENSSL_free(group);
 137         }
 138
 139
 140 int EC_GROUP_copy(EC_GROUP *dest, const EC_GROUP *src)
 141         {
 142         if (dest->meth->group_copy == 0)
 143                 {
 144                 ECerr(EC_F_EC_GROUP_COPY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
 145                 return 0;
 146                 }
 147         if (dest->meth != src->meth)
 148                 {
 149                 ECerr(EC_F_EC_GROUP_COPY, EC_R_INCOMPATIBLE_OBJECTS);
 150                 return 0;
 151                 }
 152         if (dest == src)
 153                 return 1;
 154
 155         EC_GROUP_clear_free_extra_data(dest);
 156         if (src->extra_data_dup_func)
 157                 {
 158                 if (src->extra_data != NULL)
 159                         {
 160                         dest->extra_data = src->extra_data_dup_func(src->extra_data);
 161                         if (dest->extra_data == NULL)
 162                                 return 0;
 163                         }
 164
 165                 dest->extra_data_dup_func = src->extra_data_dup_func;
 166                 dest->extra_data_free_func = src->extra_data_free_func;
 167                 dest->extra_data_clear_free_func = src->extra_data_clear_free_func;
 168                 }
 169
 170         return dest->meth->group_copy(dest, src);
 171         }
 172
 173
 174 int EC_GROUP_set_generator(EC_GROUP *group, const EC_POINT *generator, const BIGNUM *order, const BIGNUM *cofactor)
 175         {
 176         if (group->meth->group_set_generator == 0)
 177                 {
 178                 ECerr(EC_F_EC_GROUP_SET_GENERATOR, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
 179                 return 0;
 180                 }
 181         return group->meth->group_set_generator(group, generator, order, cofactor);
 182         }
 183
 184
 185 /* TODO: 'set' and 'get' functions for EC_GROUPs */
 186
 187
 188 /* this has 'package' visibility */
 189 int EC_GROUP_set_extra_data(EC_GROUP *group, void *extra_data, void *(*extra_data_dup_func)(void *),
 190         void (*extra_data_free_func)(void *), void (*extra_data_clear_free_func)(void *))
 191         {
 192         if ((group->extra_data != NULL)
 193                 || (group->extra_data_dup_func != 0)
 194                 || (group->extra_data_free_func != 0)
 195                 || (group->extra_data_clear_free_func != 0))
 196                 {
 197                 ECerr(EC_F_EC_GROUP_SET_EXTRA_DATA, EC_R_SLOT_FULL);
 198                 return 0;
 199                 }
 200
 201         group->extra_data = extra_data;
 202         group->extra_data_dup_func = extra_data_dup_func;
 203         group->extra_data_free_func = extra_data_free_func;
 204         group->extra_data_clear_free_func = extra_data_clear_free_func;
 205         return 1;
 206         }
 207
 208
 209 /* this has 'package' visibility */
 210 void *EC_GROUP_get_extra_data(EC_GROUP *group, void *(*extra_data_dup_func)(void *),
 211         void (*extra_data_free_func)(void *), void (*extra_data_clear_free_func)(void *))
 212         {
 213         if ((group->extra_data_dup_func != extra_data_dup_func)
 214                 || (group->extra_data_free_func != extra_data_free_func)
 215                 || (group->extra_data_clear_free_func != extra_data_clear_free_func))
 216                 {
 217                 ECerr(EC_F_EC_GROUP_GET_EXTRA_DATA, EC_R_NO_SUCH_EXTRA_DATA);
 218                 return NULL;
 219                 }
 220
 221         return group->extra_data;
 222         }
 223
 224
 225 /* this has 'package' visibility */
 226 void EC_GROUP_free_extra_data(EC_GROUP *group)
 227         {
 228         if (group->extra_data_free_func)
 229                 group->extra_data_free_func(group->extra_data);
 230         group->extra_data = NULL;
 231         group->extra_data_dup_func = 0;
 232         group->extra_data_free_func = 0;
 233         group->extra_data_clear_free_func = 0;
 234         }
 235
 236
 237 /* this has 'package' visibility */
 238 void EC_GROUP_clear_free_extra_data(EC_GROUP *group)
 239         {
 240         if (group->extra_data_clear_free_func)
 241                 group->extra_data_clear_free_func(group->extra_data);
 242         else if (group->extra_data_free_func)
 243                 group->extra_data_free_func(group->extra_data);
 244         group->extra_data = NULL;
 245         group->extra_data_dup_func = 0;
 246         group->extra_data_free_func = 0;
 247         group->extra_data_clear_free_func = 0;
 248         }
 249
 250
 251
 252 /* functions for EC_POINT objects */
 253
 254 EC_POINT *EC_POINT_new(const EC_GROUP *group)
 255         {
 256         EC_POINT *ret;
 257
 258         if (group == NULL)
 259                 {
 260                 ECerr(EC_F_EC_POINT_NEW, ERR_R_PASSED_NULL_PARAMETER);
 261                 return NULL;
 262                 }
 263         if (group->meth->point_init == 0)
 264                 {
 265                 ECerr(EC_F_EC_POINT_NEW, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
 266                 return NULL;
 267                 }
 268
 269         ret = OPENSSL_malloc(sizeof *ret);
 270         if (ret == NULL)
 271                 {
 272                 ECerr(EC_F_EC_POINT_NEW, ERR_R_MALLOC_FAILURE);
 273                 return NULL;
 274                 }
 275
 276         ret->meth = group->meth;
 277
 278         if (!ret->meth->point_init(ret))
 279                 {
 280                 OPENSSL_free(ret);
 281                 return NULL;
 282                 }
 283
 284         return ret;
 285         }
 286
 287
 288 void EC_POINT_free(EC_POINT *point)
 289         {
 290         if (point->meth->point_finish != 0)
 291                 point->meth->point_finish(point);
 292         OPENSSL_free(point);
 293         }
 294
 295
 296 void EC_POINT_clear_free(EC_POINT *point)
 297         {
 298         if (point->meth->point_clear_finish != 0)
 299                 point->meth->point_clear_finish(point);
 300         else if (point->meth != NULL && point->meth->point_finish != 0)
 301                 point->meth->point_finish(point);
 302         memset(point, 0, sizeof *point);
 303         OPENSSL_free(point);
 304         }
 305
 306
 307 int EC_POINT_copy(EC_POINT *dest, const EC_POINT *src)
 308         {
 309         if (dest->meth->point_copy == 0)
 310                 {
 311                 ECerr(EC_F_EC_POINT_COPY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
 312                 return 0;
 313                 }
 314         if (dest->meth != src->meth)
 315                 {
 316                 ECerr(EC_F_EC_POINT_COPY, EC_R_INCOMPATIBLE_OBJECTS);
 317                 return 0;
 318                 }
 319         return dest->meth->point_copy(dest, src);
 320         }
 321
 322
 323 int EC_POINT_set_to_infinity(const EC_GROUP *group, EC_POINT *point)
 324         {
 325         if (group->meth->point_set_to_infinity == 0)
 326                 {
 327                 ECerr(EC_F_EC_POINT_SET_TO_INFINITY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
 328                 return 0;
 329                 }
 330         if (group->meth != point->meth)
 331                 {
 332                 ECerr(EC_F_EC_POINT_SET_TO_INFINITY, EC_R_INCOMPATIBLE_OBJECTS);
 333                 return 0;
 334                 }
 335         return group->meth->point_set_to_infinity(group, point);
 336         }
 337
 338
 339 int EC_POINT_set_Jprojective_coordinates_GFp(const EC_GROUP *group, EC_POINT *point,
 340         const BIGNUM *x, const BIGNUM *y, const BIGNUM *z, BN_CTX *ctx)
 341         {
 342         if (group->meth->point_set_Jprojective_coordinates_GFp == 0)
 343                 {
 344                 ECerr(EC_F_EC_POINT_SET_JPROJECTIVE_COORDINATES_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
 345                 return 0;
 346                 }
 347         if (group->meth != point->meth)
 348                 {
 349                 ECerr(EC_F_EC_POINT_SET_JPROJECTIVE_COORDINATES_GFP, EC_R_INCOMPATIBLE_OBJECTS);
 350                 return 0;
 351                 }
 352         return group->meth->point_set_Jprojective_coordinates_GFp(group, point, x, y, z, ctx);
 353         }
 354
 355
 356 int EC_POINT_get_Jprojective_coordinates_GFp(const EC_GROUP *group, const EC_POINT *point,
 357         BIGNUM *x, BIGNUM *y, BIGNUM *z, BN_CTX *ctx)
 358         {
 359         if (group->meth->point_get_Jprojective_coordinates_GFp == 0)
 360                 {
 361                 ECerr(EC_F_EC_POINT_GET_JPROJECTIVE_COORDINATES_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
 362                 return 0;
 363                 }
 364         if (group->meth != point->meth)
 365                 {
 366                 ECerr(EC_F_EC_POINT_GET_JPROJECTIVE_COORDINATES_GFP, EC_R_INCOMPATIBLE_OBJECTS);
 367                 return 0;
 368                 }
 369         return group->meth->point_get_Jprojective_coordinates_GFp(group, point, x, y, z, ctx);
 370         }
 371
 372
 373 int EC_POINT_set_affine_coordinates_GFp(const EC_GROUP *group, EC_POINT *point,
 374         const BIGNUM *x, const BIGNUM *y, BN_CTX *ctx)
 375         {
 376         if (group->meth->point_set_affine_coordinates_GFp == 0)
 377                 {
 378                 ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
 379                 return 0;
 380                 }
 381         if (group->meth != point->meth)
 382                 {
 383                 ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GFP, EC_R_INCOMPATIBLE_OBJECTS);
 384                 return 0;
 385                 }
 386         return group->meth->point_set_affine_coordinates_GFp(group, point, x, y, ctx);
 387         }
 388
 389
 390 int EC_POINT_get_affine_coordinates_GFp(const EC_GROUP *group, const EC_POINT *point,
 391         BIGNUM *x, BIGNUM *y, BN_CTX *ctx)
 392         {
 393         if (group->meth->point_get_affine_coordinates_GFp == 0)
 394                 {
 395                 ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
 396                 return 0;
 397                 }
 398         if (group->meth != point->meth)
 399                 {
 400                 ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GFP, EC_R_INCOMPATIBLE_OBJECTS);
 401                 return 0;
 402                 }
 403         return group->meth->point_get_affine_coordinates_GFp(group, point, x, y, ctx);
 404         }
 405
 406
 407 int EC_POINT_set_compressed_coordinates_GFp(const EC_GROUP *group, EC_POINT *point,
 408         const BIGNUM *x, int y_bit, BN_CTX *ctx)
 409         {
 410         if (group->meth->point_set_compressed_coordinates_GFp == 0)
 411                 {
 412                 ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
 413                 return 0;
 414                 }
 415         if (group->meth != point->meth)
 416                 {
 417                 ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES_GFP, EC_R_INCOMPATIBLE_OBJECTS);
 418                 return 0;
 419                 }
 420         return group->meth->point_set_compressed_coordinates_GFp(group, point, x, y_bit, ctx);
 421         }
 422
 423
 424 size_t EC_POINT_point2oct(const EC_GROUP *group, const EC_POINT *point, point_conversion_form_t form,
 425         unsigned char *buf, size_t len, BN_CTX *ctx)
 426         {
 427         if (group->meth->point2oct == 0)
 428                 {
 429                 ECerr(EC_F_EC_POINT_POINT2OCT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
 430                 return 0;
 431                 }
 432         if (group->meth != point->meth)
 433                 {
 434                 ECerr(EC_F_EC_POINT_POINT2OCT, EC_R_INCOMPATIBLE_OBJECTS);
 435                 return 0;
 436                 }
 437         return group->meth->point2oct(group, point, form, buf, len, ctx);
 438         }
 439
 440
 441 int EC_POINT_oct2point(const EC_GROUP *group, EC_POINT *point,
 442         const unsigned char *buf, size_t len, BN_CTX *ctx)
 443         {
 444         if (group->meth->oct2point == 0)
 445                 {
 446                 ECerr(EC_F_EC_POINT_OCT2POINT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
 447                 return 0;
 448                 }
 449         if (group->meth != point->meth)
 450                 {
 451                 ECerr(EC_F_EC_POINT_OCT2POINT, EC_R_INCOMPATIBLE_OBJECTS);
 452                 return 0;
 453                 }
 454         return group->meth->oct2point(group, point, buf, len, ctx);
 455         }
 456
 457
 458 int EC_POINT_add(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a, const EC_POINT *b, BN_CTX *ctx)
 459         {
 460         if (group->meth->add == 0)
 461                 {
 462                 ECerr(EC_F_EC_POINT_ADD, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
 463                 return 0;
 464                 }
 465         if ((group->meth != r->meth) || (r->meth != a->meth) || (a->meth != b->meth))
 466                 {
 467                 ECerr(EC_F_EC_POINT_ADD, EC_R_INCOMPATIBLE_OBJECTS);
 468                 return 0;
 469                 }
 470         return group->meth->add(group, r, a, b, ctx);
 471         }
 472
 473
 474 int EC_POINT_dbl(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a, BN_CTX *ctx)
 475         {
 476         if (group->meth->dbl == 0)
 477                 {
 478                 ECerr(EC_F_EC_POINT_DBL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
 479                 return 0;
 480                 }
 481         if ((group->meth != r->meth) || (r->meth != a->meth))
 482                 {
 483                 ECerr(EC_F_EC_POINT_DBL, EC_R_INCOMPATIBLE_OBJECTS);
 484                 return 0;
 485                 }
 486         return group->meth->dbl(group, r, a, ctx);
 487         }
 488
 489
 490 int EC_POINT_invert(const EC_GROUP *group, EC_POINT *a, BN_CTX *ctx)
 491         {
 492         if (group->meth->dbl == 0)
 493                 {
 494                 ECerr(EC_F_EC_POINT_DBL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
 495                 return 0;
 496                 }
 497         if (group->meth != a->meth)
 498                 {
 499                 ECerr(EC_F_EC_POINT_DBL, EC_R_INCOMPATIBLE_OBJECTS);
 500                 return 0;
 501                 }
 502         return group->meth->invert(group, a, ctx);
 503         }
 504
 505
 506 int EC_POINT_is_at_infinity(const EC_GROUP *group, const EC_POINT *point)
 507         {
 508         if (group->meth->is_at_infinity == 0)
 509                 {
 510                 ECerr(EC_F_EC_POINT_IS_AT_INFINITY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
 511                 return 0;
 512                 }
 513         if (group->meth != point->meth)
 514                 {
 515                 ECerr(EC_F_EC_POINT_IS_AT_INFINITY, EC_R_INCOMPATIBLE_OBJECTS);
 516                 return 0;
 517                 }
 518         return group->meth->is_at_infinity(group, point);
 519         }
 520
 521
 522 int EC_POINT_is_on_curve(const EC_GROUP *group, const EC_POINT *point, BN_CTX *ctx)
 523         {
 524         if (group->meth->is_on_curve == 0)
 525                 {
 526                 ECerr(EC_F_EC_POINT_IS_ON_CURVE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
 527                 return 0;
 528                 }
 529         if (group->meth != point->meth)
 530                 {
 531                 ECerr(EC_F_EC_POINT_IS_ON_CURVE, EC_R_INCOMPATIBLE_OBJECTS);
 532                 return 0;
 533                 }
 534         return group->meth->is_on_curve(group, point, ctx);
 535         }
 536
 537
 538 int EC_POINT_cmp(const EC_GROUP *group, const EC_POINT *a, const EC_POINT *b, BN_CTX *ctx)
 539         {
 540         if (group->meth->point_cmp == 0)
 541                 {
 542                 ECerr(EC_F_EC_POINT_CMP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
 543                 return 0;
 544                 }
 545         if ((group->meth != a->meth) || (a->meth != b->meth))
 546                 {
 547                 ECerr(EC_F_EC_POINT_CMP, EC_R_INCOMPATIBLE_OBJECTS);
 548                 return 0;
 549                 }
 550         return group->meth->point_cmp(group, a, b, ctx);
 551         }
 552
 553
 554 int EC_POINT_make_affine(const EC_GROUP *group, EC_POINT *point, BN_CTX *ctx)
 555         {
 556         if (group->meth->make_affine == 0)
 557                 {
 558                 ECerr(EC_F_EC_POINT_MAKE_AFFINE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
 559                 return 0;
 560                 }
 561         if (group->meth != point->meth)
 562                 {
 563                 ECerr(EC_F_EC_POINT_MAKE_AFFINE, EC_R_INCOMPATIBLE_OBJECTS);
 564                 return 0;
 565                 }
 566         return group->meth->make_affine(group, point, ctx);
 567         }