1 /* 2 * Copyright 2002-2018 The OpenSSL Project Authors. All Rights Reserved. 3 * 4 * Licensed under the OpenSSL license (the "License"). You may not use 5 * this file except in compliance with the License. You can obtain a copy 6 * in the file LICENSE in the source distribution or at 7 * https://www.openssl.org/source/license.html 8 */ 9 10 #include <string.h> 11 #include "ec_lcl.h" 12 #include <openssl/err.h> 13 #include <openssl/asn1t.h> 14 #include <openssl/objects.h> 15 #include "internal/nelem.h" 16 17 int EC_GROUP_get_basis_type(const EC_GROUP *group) 18 { 19 int i; 20 21 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) != 22 NID_X9_62_characteristic_two_field) 23 /* everything else is currently not supported */ 24 return 0; 25 26 /* Find the last non-zero element of group->poly[] */ 27 for (i = 0; 28 i < (int)OSSL_NELEM(group->poly) && group->poly[i] != 0; 29 i++) 30 continue; 31 32 if (i == 4) 33 return NID_X9_62_ppBasis; 34 else if (i == 2) 35 return NID_X9_62_tpBasis; 36 else 37 /* everything else is currently not supported */ 38 return 0; 39 } 40 41 #ifndef OPENSSL_NO_EC2M 42 int EC_GROUP_get_trinomial_basis(const EC_GROUP *group, unsigned int *k) 43 { 44 if (group == NULL) 45 return 0; 46 47 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) != 48 NID_X9_62_characteristic_two_field 49 || !((group->poly[0] != 0) && (group->poly[1] != 0) 50 && (group->poly[2] == 0))) { 51 ECerr(EC_F_EC_GROUP_GET_TRINOMIAL_BASIS, 52 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 53 return 0; 54 } 55 56 if (k) 57 *k = group->poly[1]; 58 59 return 1; 60 } 61 62 int EC_GROUP_get_pentanomial_basis(const EC_GROUP *group, unsigned int *k1, 63 unsigned int *k2, unsigned int *k3) 64 { 65 if (group == NULL) 66 return 0; 67 68 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) != 69 NID_X9_62_characteristic_two_field 70 || !((group->poly[0] != 0) && (group->poly[1] != 0) 71 && (group->poly[2] != 0) && (group->poly[3] != 0) 72 && (group->poly[4] == 0))) { 73 ECerr(EC_F_EC_GROUP_GET_PENTANOMIAL_BASIS, 74 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 75 return 0; 76 } 77 78 if (k1) 79 *k1 = group->poly[3]; 80 if (k2) 81 *k2 = group->poly[2]; 82 if (k3) 83 *k3 = group->poly[1]; 84 85 return 1; 86 } 87 #endif 88 89 /* some structures needed for the asn1 encoding */ 90 typedef struct x9_62_pentanomial_st { 91 int32_t k1; 92 int32_t k2; 93 int32_t k3; 94 } X9_62_PENTANOMIAL; 95 96 typedef struct x9_62_characteristic_two_st { 97 int32_t m; 98 ASN1_OBJECT *type; 99 union { 100 char *ptr; 101 /* NID_X9_62_onBasis */ 102 ASN1_NULL *onBasis; 103 /* NID_X9_62_tpBasis */ 104 ASN1_INTEGER *tpBasis; 105 /* NID_X9_62_ppBasis */ 106 X9_62_PENTANOMIAL *ppBasis; 107 /* anything else */ 108 ASN1_TYPE *other; 109 } p; 110 } X9_62_CHARACTERISTIC_TWO; 111 112 typedef struct x9_62_fieldid_st { 113 ASN1_OBJECT *fieldType; 114 union { 115 char *ptr; 116 /* NID_X9_62_prime_field */ 117 ASN1_INTEGER *prime; 118 /* NID_X9_62_characteristic_two_field */ 119 X9_62_CHARACTERISTIC_TWO *char_two; 120 /* anything else */ 121 ASN1_TYPE *other; 122 } p; 123 } X9_62_FIELDID; 124 125 typedef struct x9_62_curve_st { 126 ASN1_OCTET_STRING *a; 127 ASN1_OCTET_STRING *b; 128 ASN1_BIT_STRING *seed; 129 } X9_62_CURVE; 130 131 struct ec_parameters_st { 132 int32_t version; 133 X9_62_FIELDID *fieldID; 134 X9_62_CURVE *curve; 135 ASN1_OCTET_STRING *base; 136 ASN1_INTEGER *order; 137 ASN1_INTEGER *cofactor; 138 } /* ECPARAMETERS */ ; 139 140 struct ecpk_parameters_st { 141 int type; 142 union { 143 ASN1_OBJECT *named_curve; 144 ECPARAMETERS *parameters; 145 ASN1_NULL *implicitlyCA; 146 } value; 147 } /* ECPKPARAMETERS */ ; 148 149 /* SEC1 ECPrivateKey */ 150 typedef struct ec_privatekey_st { 151 int32_t version; 152 ASN1_OCTET_STRING *privateKey; 153 ECPKPARAMETERS *parameters; 154 ASN1_BIT_STRING *publicKey; 155 } EC_PRIVATEKEY; 156 157 /* the OpenSSL ASN.1 definitions */ 158 ASN1_SEQUENCE(X9_62_PENTANOMIAL) = { 159 ASN1_EMBED(X9_62_PENTANOMIAL, k1, INT32), 160 ASN1_EMBED(X9_62_PENTANOMIAL, k2, INT32), 161 ASN1_EMBED(X9_62_PENTANOMIAL, k3, INT32) 162 } static_ASN1_SEQUENCE_END(X9_62_PENTANOMIAL) 163 164 DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL) 165 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL) 166 167 ASN1_ADB_TEMPLATE(char_two_def) = ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.other, ASN1_ANY); 168 169 ASN1_ADB(X9_62_CHARACTERISTIC_TWO) = { 170 ADB_ENTRY(NID_X9_62_onBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.onBasis, ASN1_NULL)), 171 ADB_ENTRY(NID_X9_62_tpBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.tpBasis, ASN1_INTEGER)), 172 ADB_ENTRY(NID_X9_62_ppBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.ppBasis, X9_62_PENTANOMIAL)) 173 } ASN1_ADB_END(X9_62_CHARACTERISTIC_TWO, 0, type, 0, &char_two_def_tt, NULL); 174 175 ASN1_SEQUENCE(X9_62_CHARACTERISTIC_TWO) = { 176 ASN1_EMBED(X9_62_CHARACTERISTIC_TWO, m, INT32), 177 ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, type, ASN1_OBJECT), 178 ASN1_ADB_OBJECT(X9_62_CHARACTERISTIC_TWO) 179 } static_ASN1_SEQUENCE_END(X9_62_CHARACTERISTIC_TWO) 180 181 DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO) 182 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO) 183 184 ASN1_ADB_TEMPLATE(fieldID_def) = ASN1_SIMPLE(X9_62_FIELDID, p.other, ASN1_ANY); 185 186 ASN1_ADB(X9_62_FIELDID) = { 187 ADB_ENTRY(NID_X9_62_prime_field, ASN1_SIMPLE(X9_62_FIELDID, p.prime, ASN1_INTEGER)), 188 ADB_ENTRY(NID_X9_62_characteristic_two_field, ASN1_SIMPLE(X9_62_FIELDID, p.char_two, X9_62_CHARACTERISTIC_TWO)) 189 } ASN1_ADB_END(X9_62_FIELDID, 0, fieldType, 0, &fieldID_def_tt, NULL); 190 191 ASN1_SEQUENCE(X9_62_FIELDID) = { 192 ASN1_SIMPLE(X9_62_FIELDID, fieldType, ASN1_OBJECT), 193 ASN1_ADB_OBJECT(X9_62_FIELDID) 194 } static_ASN1_SEQUENCE_END(X9_62_FIELDID) 195 196 ASN1_SEQUENCE(X9_62_CURVE) = { 197 ASN1_SIMPLE(X9_62_CURVE, a, ASN1_OCTET_STRING), 198 ASN1_SIMPLE(X9_62_CURVE, b, ASN1_OCTET_STRING), 199 ASN1_OPT(X9_62_CURVE, seed, ASN1_BIT_STRING) 200 } static_ASN1_SEQUENCE_END(X9_62_CURVE) 201 202 ASN1_SEQUENCE(ECPARAMETERS) = { 203 ASN1_EMBED(ECPARAMETERS, version, INT32), 204 ASN1_SIMPLE(ECPARAMETERS, fieldID, X9_62_FIELDID), 205 ASN1_SIMPLE(ECPARAMETERS, curve, X9_62_CURVE), 206 ASN1_SIMPLE(ECPARAMETERS, base, ASN1_OCTET_STRING), 207 ASN1_SIMPLE(ECPARAMETERS, order, ASN1_INTEGER), 208 ASN1_OPT(ECPARAMETERS, cofactor, ASN1_INTEGER) 209 } ASN1_SEQUENCE_END(ECPARAMETERS) 210 211 DECLARE_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS) 212 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS) 213 214 ASN1_CHOICE(ECPKPARAMETERS) = { 215 ASN1_SIMPLE(ECPKPARAMETERS, value.named_curve, ASN1_OBJECT), 216 ASN1_SIMPLE(ECPKPARAMETERS, value.parameters, ECPARAMETERS), 217 ASN1_SIMPLE(ECPKPARAMETERS, value.implicitlyCA, ASN1_NULL) 218 } ASN1_CHOICE_END(ECPKPARAMETERS) 219 220 DECLARE_ASN1_FUNCTIONS_const(ECPKPARAMETERS) 221 DECLARE_ASN1_ENCODE_FUNCTIONS_const(ECPKPARAMETERS, ECPKPARAMETERS) 222 IMPLEMENT_ASN1_FUNCTIONS_const(ECPKPARAMETERS) 223 224 ASN1_SEQUENCE(EC_PRIVATEKEY) = { 225 ASN1_EMBED(EC_PRIVATEKEY, version, INT32), 226 ASN1_SIMPLE(EC_PRIVATEKEY, privateKey, ASN1_OCTET_STRING), 227 ASN1_EXP_OPT(EC_PRIVATEKEY, parameters, ECPKPARAMETERS, 0), 228 ASN1_EXP_OPT(EC_PRIVATEKEY, publicKey, ASN1_BIT_STRING, 1) 229 } static_ASN1_SEQUENCE_END(EC_PRIVATEKEY) 230 231 DECLARE_ASN1_FUNCTIONS_const(EC_PRIVATEKEY) 232 DECLARE_ASN1_ENCODE_FUNCTIONS_const(EC_PRIVATEKEY, EC_PRIVATEKEY) 233 IMPLEMENT_ASN1_FUNCTIONS_const(EC_PRIVATEKEY) 234 235 /* some declarations of internal function */ 236 237 /* ec_asn1_group2field() sets the values in a X9_62_FIELDID object */ 238 static int ec_asn1_group2fieldid(const EC_GROUP *, X9_62_FIELDID *); 239 /* ec_asn1_group2curve() sets the values in a X9_62_CURVE object */ 240 static int ec_asn1_group2curve(const EC_GROUP *, X9_62_CURVE *); 241 242 /* the function definitions */ 243 244 static int ec_asn1_group2fieldid(const EC_GROUP *group, X9_62_FIELDID *field) 245 { 246 int ok = 0, nid; 247 BIGNUM *tmp = NULL; 248 249 if (group == NULL || field == NULL) 250 return 0; 251 252 /* clear the old values (if necessary) */ 253 ASN1_OBJECT_free(field->fieldType); 254 ASN1_TYPE_free(field->p.other); 255 256 nid = EC_METHOD_get_field_type(EC_GROUP_method_of(group)); 257 /* set OID for the field */ 258 if ((field->fieldType = OBJ_nid2obj(nid)) == NULL) { 259 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_OBJ_LIB); 260 goto err; 261 } 262 263 if (nid == NID_X9_62_prime_field) { 264 if ((tmp = BN_new()) == NULL) { 265 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE); 266 goto err; 267 } 268 /* the parameters are specified by the prime number p */ 269 if (!EC_GROUP_get_curve(group, tmp, NULL, NULL, NULL)) { 270 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_EC_LIB); 271 goto err; 272 } 273 /* set the prime number */ 274 field->p.prime = BN_to_ASN1_INTEGER(tmp, NULL); 275 if (field->p.prime == NULL) { 276 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_ASN1_LIB); 277 goto err; 278 } 279 } else if (nid == NID_X9_62_characteristic_two_field) 280 #ifdef OPENSSL_NO_EC2M 281 { 282 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, EC_R_GF2M_NOT_SUPPORTED); 283 goto err; 284 } 285 #else 286 { 287 int field_type; 288 X9_62_CHARACTERISTIC_TWO *char_two; 289 290 field->p.char_two = X9_62_CHARACTERISTIC_TWO_new(); 291 char_two = field->p.char_two; 292 293 if (char_two == NULL) { 294 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE); 295 goto err; 296 } 297 298 char_two->m = (long)EC_GROUP_get_degree(group); 299 300 field_type = EC_GROUP_get_basis_type(group); 301 302 if (field_type == 0) { 303 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_EC_LIB); 304 goto err; 305 } 306 /* set base type OID */ 307 if ((char_two->type = OBJ_nid2obj(field_type)) == NULL) { 308 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_OBJ_LIB); 309 goto err; 310 } 311 312 if (field_type == NID_X9_62_tpBasis) { 313 unsigned int k; 314 315 if (!EC_GROUP_get_trinomial_basis(group, &k)) 316 goto err; 317 318 char_two->p.tpBasis = ASN1_INTEGER_new(); 319 if (char_two->p.tpBasis == NULL) { 320 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE); 321 goto err; 322 } 323 if (!ASN1_INTEGER_set(char_two->p.tpBasis, (long)k)) { 324 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_ASN1_LIB); 325 goto err; 326 } 327 } else if (field_type == NID_X9_62_ppBasis) { 328 unsigned int k1, k2, k3; 329 330 if (!EC_GROUP_get_pentanomial_basis(group, &k1, &k2, &k3)) 331 goto err; 332 333 char_two->p.ppBasis = X9_62_PENTANOMIAL_new(); 334 if (char_two->p.ppBasis == NULL) { 335 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE); 336 goto err; 337 } 338 339 /* set k? values */ 340 char_two->p.ppBasis->k1 = (long)k1; 341 char_two->p.ppBasis->k2 = (long)k2; 342 char_two->p.ppBasis->k3 = (long)k3; 343 } else { /* field_type == NID_X9_62_onBasis */ 344 345 /* for ONB the parameters are (asn1) NULL */ 346 char_two->p.onBasis = ASN1_NULL_new(); 347 if (char_two->p.onBasis == NULL) { 348 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE); 349 goto err; 350 } 351 } 352 } 353 #endif 354 else { 355 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, EC_R_UNSUPPORTED_FIELD); 356 goto err; 357 } 358 359 ok = 1; 360 361 err: 362 BN_free(tmp); 363 return ok; 364 } 365 366 static int ec_asn1_group2curve(const EC_GROUP *group, X9_62_CURVE *curve) 367 { 368 int ok = 0; 369 BIGNUM *tmp_1 = NULL, *tmp_2 = NULL; 370 unsigned char *a_buf = NULL, *b_buf = NULL; 371 size_t len; 372 373 if (!group || !curve || !curve->a || !curve->b) 374 return 0; 375 376 if ((tmp_1 = BN_new()) == NULL || (tmp_2 = BN_new()) == NULL) { 377 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE); 378 goto err; 379 } 380 381 /* get a and b */ 382 if (!EC_GROUP_get_curve(group, NULL, tmp_1, tmp_2, NULL)) { 383 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_EC_LIB); 384 goto err; 385 } 386 387 /* 388 * Per SEC 1, the curve coefficients must be padded up to size. See C.2's 389 * definition of Curve, C.1's definition of FieldElement, and 2.3.5's 390 * definition of how to encode the field elements. 391 */ 392 len = ((size_t)EC_GROUP_get_degree(group) + 7) / 8; 393 if ((a_buf = OPENSSL_malloc(len)) == NULL 394 || (b_buf = OPENSSL_malloc(len)) == NULL) { 395 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE); 396 goto err; 397 } 398 if (BN_bn2binpad(tmp_1, a_buf, len) < 0 399 || BN_bn2binpad(tmp_2, b_buf, len) < 0) { 400 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_BN_LIB); 401 goto err; 402 } 403 404 /* set a and b */ 405 if (!ASN1_OCTET_STRING_set(curve->a, a_buf, len) 406 || !ASN1_OCTET_STRING_set(curve->b, b_buf, len)) { 407 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_ASN1_LIB); 408 goto err; 409 } 410 411 /* set the seed (optional) */ 412 if (group->seed) { 413 if (!curve->seed) 414 if ((curve->seed = ASN1_BIT_STRING_new()) == NULL) { 415 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE); 416 goto err; 417 } 418 curve->seed->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07); 419 curve->seed->flags |= ASN1_STRING_FLAG_BITS_LEFT; 420 if (!ASN1_BIT_STRING_set(curve->seed, group->seed, 421 (int)group->seed_len)) { 422 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_ASN1_LIB); 423 goto err; 424 } 425 } else { 426 ASN1_BIT_STRING_free(curve->seed); 427 curve->seed = NULL; 428 } 429 430 ok = 1; 431 432 err: 433 OPENSSL_free(a_buf); 434 OPENSSL_free(b_buf); 435 BN_free(tmp_1); 436 BN_free(tmp_2); 437 return ok; 438 } 439 440 ECPARAMETERS *EC_GROUP_get_ecparameters(const EC_GROUP *group, 441 ECPARAMETERS *params) 442 { 443 size_t len = 0; 444 ECPARAMETERS *ret = NULL; 445 const BIGNUM *tmp; 446 unsigned char *buffer = NULL; 447 const EC_POINT *point = NULL; 448 point_conversion_form_t form; 449 450 if (params == NULL) { 451 if ((ret = ECPARAMETERS_new()) == NULL) { 452 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_MALLOC_FAILURE); 453 goto err; 454 } 455 } else 456 ret = params; 457 458 /* set the version (always one) */ 459 ret->version = (long)0x1; 460 461 /* set the fieldID */ 462 if (!ec_asn1_group2fieldid(group, ret->fieldID)) { 463 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_EC_LIB); 464 goto err; 465 } 466 467 /* set the curve */ 468 if (!ec_asn1_group2curve(group, ret->curve)) { 469 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_EC_LIB); 470 goto err; 471 } 472 473 /* set the base point */ 474 if ((point = EC_GROUP_get0_generator(group)) == NULL) { 475 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, EC_R_UNDEFINED_GENERATOR); 476 goto err; 477 } 478 479 form = EC_GROUP_get_point_conversion_form(group); 480 481 len = EC_POINT_point2buf(group, point, form, &buffer, NULL); 482 if (len == 0) { 483 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_EC_LIB); 484 goto err; 485 } 486 if (ret->base == NULL && (ret->base = ASN1_OCTET_STRING_new()) == NULL) { 487 OPENSSL_free(buffer); 488 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_MALLOC_FAILURE); 489 goto err; 490 } 491 ASN1_STRING_set0(ret->base, buffer, len); 492 493 /* set the order */ 494 tmp = EC_GROUP_get0_order(group); 495 if (tmp == NULL) { 496 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_EC_LIB); 497 goto err; 498 } 499 ret->order = BN_to_ASN1_INTEGER(tmp, ret->order); 500 if (ret->order == NULL) { 501 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_ASN1_LIB); 502 goto err; 503 } 504 505 /* set the cofactor (optional) */ 506 tmp = EC_GROUP_get0_cofactor(group); 507 if (tmp != NULL) { 508 ret->cofactor = BN_to_ASN1_INTEGER(tmp, ret->cofactor); 509 if (ret->cofactor == NULL) { 510 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_ASN1_LIB); 511 goto err; 512 } 513 } 514 515 return ret; 516 517 err: 518 if (params == NULL) 519 ECPARAMETERS_free(ret); 520 return NULL; 521 } 522 523 ECPKPARAMETERS *EC_GROUP_get_ecpkparameters(const EC_GROUP *group, 524 ECPKPARAMETERS *params) 525 { 526 int ok = 1, tmp; 527 ECPKPARAMETERS *ret = params; 528 529 if (ret == NULL) { 530 if ((ret = ECPKPARAMETERS_new()) == NULL) { 531 ECerr(EC_F_EC_GROUP_GET_ECPKPARAMETERS, ERR_R_MALLOC_FAILURE); 532 return NULL; 533 } 534 } else { 535 if (ret->type == 0) 536 ASN1_OBJECT_free(ret->value.named_curve); 537 else if (ret->type == 1 && ret->value.parameters) 538 ECPARAMETERS_free(ret->value.parameters); 539 } 540 541 if (EC_GROUP_get_asn1_flag(group)) { 542 /* 543 * use the asn1 OID to describe the elliptic curve parameters 544 */ 545 tmp = EC_GROUP_get_curve_name(group); 546 if (tmp) { 547 ret->type = 0; 548 if ((ret->value.named_curve = OBJ_nid2obj(tmp)) == NULL) 549 ok = 0; 550 } else 551 /* we don't know the nid => ERROR */ 552 ok = 0; 553 } else { 554 /* use the ECPARAMETERS structure */ 555 ret->type = 1; 556 if ((ret->value.parameters = 557 EC_GROUP_get_ecparameters(group, NULL)) == NULL) 558 ok = 0; 559 } 560 561 if (!ok) { 562 ECPKPARAMETERS_free(ret); 563 return NULL; 564 } 565 return ret; 566 } 567 568 EC_GROUP *EC_GROUP_new_from_ecparameters(const ECPARAMETERS *params) 569 { 570 int ok = 0, tmp; 571 EC_GROUP *ret = NULL; 572 BIGNUM *p = NULL, *a = NULL, *b = NULL; 573 EC_POINT *point = NULL; 574 long field_bits; 575 576 if (!params->fieldID || !params->fieldID->fieldType || 577 !params->fieldID->p.ptr) { 578 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR); 579 goto err; 580 } 581 582 /* 583 * Now extract the curve parameters a and b. Note that, although SEC 1 584 * specifies the length of their encodings, historical versions of OpenSSL 585 * encoded them incorrectly, so we must accept any length for backwards 586 * compatibility. 587 */ 588 if (!params->curve || !params->curve->a || 589 !params->curve->a->data || !params->curve->b || 590 !params->curve->b->data) { 591 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR); 592 goto err; 593 } 594 a = BN_bin2bn(params->curve->a->data, params->curve->a->length, NULL); 595 if (a == NULL) { 596 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_BN_LIB); 597 goto err; 598 } 599 b = BN_bin2bn(params->curve->b->data, params->curve->b->length, NULL); 600 if (b == NULL) { 601 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_BN_LIB); 602 goto err; 603 } 604 605 /* get the field parameters */ 606 tmp = OBJ_obj2nid(params->fieldID->fieldType); 607 if (tmp == NID_X9_62_characteristic_two_field) 608 #ifdef OPENSSL_NO_EC2M 609 { 610 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_GF2M_NOT_SUPPORTED); 611 goto err; 612 } 613 #else 614 { 615 X9_62_CHARACTERISTIC_TWO *char_two; 616 617 char_two = params->fieldID->p.char_two; 618 619 field_bits = char_two->m; 620 if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) { 621 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_FIELD_TOO_LARGE); 622 goto err; 623 } 624 625 if ((p = BN_new()) == NULL) { 626 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_MALLOC_FAILURE); 627 goto err; 628 } 629 630 /* get the base type */ 631 tmp = OBJ_obj2nid(char_two->type); 632 633 if (tmp == NID_X9_62_tpBasis) { 634 long tmp_long; 635 636 if (!char_two->p.tpBasis) { 637 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR); 638 goto err; 639 } 640 641 tmp_long = ASN1_INTEGER_get(char_two->p.tpBasis); 642 643 if (!(char_two->m > tmp_long && tmp_long > 0)) { 644 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, 645 EC_R_INVALID_TRINOMIAL_BASIS); 646 goto err; 647 } 648 649 /* create the polynomial */ 650 if (!BN_set_bit(p, (int)char_two->m)) 651 goto err; 652 if (!BN_set_bit(p, (int)tmp_long)) 653 goto err; 654 if (!BN_set_bit(p, 0)) 655 goto err; 656 } else if (tmp == NID_X9_62_ppBasis) { 657 X9_62_PENTANOMIAL *penta; 658 659 penta = char_two->p.ppBasis; 660 if (!penta) { 661 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR); 662 goto err; 663 } 664 665 if (! 666 (char_two->m > penta->k3 && penta->k3 > penta->k2 667 && penta->k2 > penta->k1 && penta->k1 > 0)) { 668 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, 669 EC_R_INVALID_PENTANOMIAL_BASIS); 670 goto err; 671 } 672 673 /* create the polynomial */ 674 if (!BN_set_bit(p, (int)char_two->m)) 675 goto err; 676 if (!BN_set_bit(p, (int)penta->k1)) 677 goto err; 678 if (!BN_set_bit(p, (int)penta->k2)) 679 goto err; 680 if (!BN_set_bit(p, (int)penta->k3)) 681 goto err; 682 if (!BN_set_bit(p, 0)) 683 goto err; 684 } else if (tmp == NID_X9_62_onBasis) { 685 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_NOT_IMPLEMENTED); 686 goto err; 687 } else { /* error */ 688 689 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR); 690 goto err; 691 } 692 693 /* create the EC_GROUP structure */ 694 ret = EC_GROUP_new_curve_GF2m(p, a, b, NULL); 695 } 696 #endif 697 else if (tmp == NID_X9_62_prime_field) { 698 /* we have a curve over a prime field */ 699 /* extract the prime number */ 700 if (!params->fieldID->p.prime) { 701 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR); 702 goto err; 703 } 704 p = ASN1_INTEGER_to_BN(params->fieldID->p.prime, NULL); 705 if (p == NULL) { 706 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_ASN1_LIB); 707 goto err; 708 } 709 710 if (BN_is_negative(p) || BN_is_zero(p)) { 711 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_FIELD); 712 goto err; 713 } 714 715 field_bits = BN_num_bits(p); 716 if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) { 717 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_FIELD_TOO_LARGE); 718 goto err; 719 } 720 721 /* create the EC_GROUP structure */ 722 ret = EC_GROUP_new_curve_GFp(p, a, b, NULL); 723 } else { 724 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_FIELD); 725 goto err; 726 } 727 728 if (ret == NULL) { 729 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB); 730 goto err; 731 } 732 733 /* extract seed (optional) */ 734 if (params->curve->seed != NULL) { 735 OPENSSL_free(ret->seed); 736 if ((ret->seed = OPENSSL_malloc(params->curve->seed->length)) == NULL) { 737 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_MALLOC_FAILURE); 738 goto err; 739 } 740 memcpy(ret->seed, params->curve->seed->data, 741 params->curve->seed->length); 742 ret->seed_len = params->curve->seed->length; 743 } 744 745 if (!params->order || !params->base || !params->base->data) { 746 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR); 747 goto err; 748 } 749 750 if ((point = EC_POINT_new(ret)) == NULL) 751 goto err; 752 753 /* set the point conversion form */ 754 EC_GROUP_set_point_conversion_form(ret, (point_conversion_form_t) 755 (params->base->data[0] & ~0x01)); 756 757 /* extract the ec point */ 758 if (!EC_POINT_oct2point(ret, point, params->base->data, 759 params->base->length, NULL)) { 760 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB); 761 goto err; 762 } 763 764 /* extract the order */ 765 if ((a = ASN1_INTEGER_to_BN(params->order, a)) == NULL) { 766 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_ASN1_LIB); 767 goto err; 768 } 769 if (BN_is_negative(a) || BN_is_zero(a)) { 770 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_GROUP_ORDER); 771 goto err; 772 } 773 if (BN_num_bits(a) > (int)field_bits + 1) { /* Hasse bound */ 774 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_GROUP_ORDER); 775 goto err; 776 } 777 778 /* extract the cofactor (optional) */ 779 if (params->cofactor == NULL) { 780 BN_free(b); 781 b = NULL; 782 } else if ((b = ASN1_INTEGER_to_BN(params->cofactor, b)) == NULL) { 783 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_ASN1_LIB); 784 goto err; 785 } 786 /* set the generator, order and cofactor (if present) */ 787 if (!EC_GROUP_set_generator(ret, point, a, b)) { 788 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB); 789 goto err; 790 } 791 792 ok = 1; 793 794 err: 795 if (!ok) { 796 EC_GROUP_clear_free(ret); 797 ret = NULL; 798 } 799 800 BN_free(p); 801 BN_free(a); 802 BN_free(b); 803 EC_POINT_free(point); 804 return ret; 805 } 806 807 EC_GROUP *EC_GROUP_new_from_ecpkparameters(const ECPKPARAMETERS *params) 808 { 809 EC_GROUP *ret = NULL; 810 int tmp = 0; 811 812 if (params == NULL) { 813 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS, EC_R_MISSING_PARAMETERS); 814 return NULL; 815 } 816 817 if (params->type == 0) { /* the curve is given by an OID */ 818 tmp = OBJ_obj2nid(params->value.named_curve); 819 if ((ret = EC_GROUP_new_by_curve_name(tmp)) == NULL) { 820 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS, 821 EC_R_EC_GROUP_NEW_BY_NAME_FAILURE); 822 return NULL; 823 } 824 EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_NAMED_CURVE); 825 } else if (params->type == 1) { /* the parameters are given by a 826 * ECPARAMETERS structure */ 827 ret = EC_GROUP_new_from_ecparameters(params->value.parameters); 828 if (!ret) { 829 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS, ERR_R_EC_LIB); 830 return NULL; 831 } 832 EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_EXPLICIT_CURVE); 833 } else if (params->type == 2) { /* implicitlyCA */ 834 return NULL; 835 } else { 836 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS, EC_R_ASN1_ERROR); 837 return NULL; 838 } 839 840 return ret; 841 } 842 843 /* EC_GROUP <-> DER encoding of ECPKPARAMETERS */ 844 845 EC_GROUP *d2i_ECPKParameters(EC_GROUP **a, const unsigned char **in, long len) 846 { 847 EC_GROUP *group = NULL; 848 ECPKPARAMETERS *params = NULL; 849 const unsigned char *p = *in; 850 851 if ((params = d2i_ECPKPARAMETERS(NULL, &p, len)) == NULL) { 852 ECerr(EC_F_D2I_ECPKPARAMETERS, EC_R_D2I_ECPKPARAMETERS_FAILURE); 853 ECPKPARAMETERS_free(params); 854 return NULL; 855 } 856 857 if ((group = EC_GROUP_new_from_ecpkparameters(params)) == NULL) { 858 ECerr(EC_F_D2I_ECPKPARAMETERS, EC_R_PKPARAMETERS2GROUP_FAILURE); 859 ECPKPARAMETERS_free(params); 860 return NULL; 861 } 862 863 if (a) { 864 EC_GROUP_clear_free(*a); 865 *a = group; 866 } 867 868 ECPKPARAMETERS_free(params); 869 *in = p; 870 return group; 871 } 872 873 int i2d_ECPKParameters(const EC_GROUP *a, unsigned char **out) 874 { 875 int ret = 0; 876 ECPKPARAMETERS *tmp = EC_GROUP_get_ecpkparameters(a, NULL); 877 if (tmp == NULL) { 878 ECerr(EC_F_I2D_ECPKPARAMETERS, EC_R_GROUP2PKPARAMETERS_FAILURE); 879 return 0; 880 } 881 if ((ret = i2d_ECPKPARAMETERS(tmp, out)) == 0) { 882 ECerr(EC_F_I2D_ECPKPARAMETERS, EC_R_I2D_ECPKPARAMETERS_FAILURE); 883 ECPKPARAMETERS_free(tmp); 884 return 0; 885 } 886 ECPKPARAMETERS_free(tmp); 887 return ret; 888 } 889 890 /* some EC_KEY functions */ 891 892 EC_KEY *d2i_ECPrivateKey(EC_KEY **a, const unsigned char **in, long len) 893 { 894 EC_KEY *ret = NULL; 895 EC_PRIVATEKEY *priv_key = NULL; 896 const unsigned char *p = *in; 897 898 if ((priv_key = d2i_EC_PRIVATEKEY(NULL, &p, len)) == NULL) { 899 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB); 900 return NULL; 901 } 902 903 if (a == NULL || *a == NULL) { 904 if ((ret = EC_KEY_new()) == NULL) { 905 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE); 906 goto err; 907 } 908 } else 909 ret = *a; 910 911 if (priv_key->parameters) { 912 EC_GROUP_clear_free(ret->group); 913 ret->group = EC_GROUP_new_from_ecpkparameters(priv_key->parameters); 914 } 915 916 if (ret->group == NULL) { 917 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB); 918 goto err; 919 } 920 921 ret->version = priv_key->version; 922 923 if (priv_key->privateKey) { 924 ASN1_OCTET_STRING *pkey = priv_key->privateKey; 925 if (EC_KEY_oct2priv(ret, ASN1_STRING_get0_data(pkey), 926 ASN1_STRING_length(pkey)) == 0) 927 goto err; 928 } else { 929 ECerr(EC_F_D2I_ECPRIVATEKEY, EC_R_MISSING_PRIVATE_KEY); 930 goto err; 931 } 932 933 EC_POINT_clear_free(ret->pub_key); 934 ret->pub_key = EC_POINT_new(ret->group); 935 if (ret->pub_key == NULL) { 936 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB); 937 goto err; 938 } 939 940 if (priv_key->publicKey) { 941 const unsigned char *pub_oct; 942 int pub_oct_len; 943 944 pub_oct = ASN1_STRING_get0_data(priv_key->publicKey); 945 pub_oct_len = ASN1_STRING_length(priv_key->publicKey); 946 if (!EC_KEY_oct2key(ret, pub_oct, pub_oct_len, NULL)) { 947 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB); 948 goto err; 949 } 950 } else { 951 if (ret->group->meth->keygenpub == NULL 952 || ret->group->meth->keygenpub(ret) == 0) 953 goto err; 954 /* Remember the original private-key-only encoding. */ 955 ret->enc_flag |= EC_PKEY_NO_PUBKEY; 956 } 957 958 if (a) 959 *a = ret; 960 EC_PRIVATEKEY_free(priv_key); 961 *in = p; 962 return ret; 963 964 err: 965 if (a == NULL || *a != ret) 966 EC_KEY_free(ret); 967 EC_PRIVATEKEY_free(priv_key); 968 return NULL; 969 } 970 971 int i2d_ECPrivateKey(EC_KEY *a, unsigned char **out) 972 { 973 int ret = 0, ok = 0; 974 unsigned char *priv= NULL, *pub= NULL; 975 size_t privlen = 0, publen = 0; 976 977 EC_PRIVATEKEY *priv_key = NULL; 978 979 if (a == NULL || a->group == NULL || 980 (!(a->enc_flag & EC_PKEY_NO_PUBKEY) && a->pub_key == NULL)) { 981 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_PASSED_NULL_PARAMETER); 982 goto err; 983 } 984 985 if ((priv_key = EC_PRIVATEKEY_new()) == NULL) { 986 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE); 987 goto err; 988 } 989 990 priv_key->version = a->version; 991 992 privlen = EC_KEY_priv2buf(a, &priv); 993 994 if (privlen == 0) { 995 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB); 996 goto err; 997 } 998 999 ASN1_STRING_set0(priv_key->privateKey, priv, privlen); 1000 priv = NULL; 1001 1002 if (!(a->enc_flag & EC_PKEY_NO_PARAMETERS)) { 1003 if ((priv_key->parameters = 1004 EC_GROUP_get_ecpkparameters(a->group, 1005 priv_key->parameters)) == NULL) { 1006 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB); 1007 goto err; 1008 } 1009 } 1010 1011 if (!(a->enc_flag & EC_PKEY_NO_PUBKEY)) { 1012 priv_key->publicKey = ASN1_BIT_STRING_new(); 1013 if (priv_key->publicKey == NULL) { 1014 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE); 1015 goto err; 1016 } 1017 1018 publen = EC_KEY_key2buf(a, a->conv_form, &pub, NULL); 1019 1020 if (publen == 0) { 1021 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB); 1022 goto err; 1023 } 1024 1025 priv_key->publicKey->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07); 1026 priv_key->publicKey->flags |= ASN1_STRING_FLAG_BITS_LEFT; 1027 ASN1_STRING_set0(priv_key->publicKey, pub, publen); 1028 pub = NULL; 1029 } 1030 1031 if ((ret = i2d_EC_PRIVATEKEY(priv_key, out)) == 0) { 1032 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB); 1033 goto err; 1034 } 1035 ok = 1; 1036 err: 1037 OPENSSL_clear_free(priv, privlen); 1038 OPENSSL_free(pub); 1039 EC_PRIVATEKEY_free(priv_key); 1040 return (ok ? ret : 0); 1041 } 1042 1043 int i2d_ECParameters(EC_KEY *a, unsigned char **out) 1044 { 1045 if (a == NULL) { 1046 ECerr(EC_F_I2D_ECPARAMETERS, ERR_R_PASSED_NULL_PARAMETER); 1047 return 0; 1048 } 1049 return i2d_ECPKParameters(a->group, out); 1050 } 1051 1052 EC_KEY *d2i_ECParameters(EC_KEY **a, const unsigned char **in, long len) 1053 { 1054 EC_KEY *ret; 1055 1056 if (in == NULL || *in == NULL) { 1057 ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_PASSED_NULL_PARAMETER); 1058 return NULL; 1059 } 1060 1061 if (a == NULL || *a == NULL) { 1062 if ((ret = EC_KEY_new()) == NULL) { 1063 ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_MALLOC_FAILURE); 1064 return NULL; 1065 } 1066 } else 1067 ret = *a; 1068 1069 if (!d2i_ECPKParameters(&ret->group, in, len)) { 1070 ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_EC_LIB); 1071 if (a == NULL || *a != ret) 1072 EC_KEY_free(ret); 1073 return NULL; 1074 } 1075 1076 if (a) 1077 *a = ret; 1078 1079 return ret; 1080 } 1081 1082 EC_KEY *o2i_ECPublicKey(EC_KEY **a, const unsigned char **in, long len) 1083 { 1084 EC_KEY *ret = NULL; 1085 1086 if (a == NULL || (*a) == NULL || (*a)->group == NULL) { 1087 /* 1088 * sorry, but a EC_GROUP-structure is necessary to set the public key 1089 */ 1090 ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_PASSED_NULL_PARAMETER); 1091 return 0; 1092 } 1093 ret = *a; 1094 if (!EC_KEY_oct2key(ret, *in, len, NULL)) { 1095 ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_EC_LIB); 1096 return 0; 1097 } 1098 *in += len; 1099 return ret; 1100 } 1101 1102 int i2o_ECPublicKey(const EC_KEY *a, unsigned char **out) 1103 { 1104 size_t buf_len = 0; 1105 int new_buffer = 0; 1106 1107 if (a == NULL) { 1108 ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_PASSED_NULL_PARAMETER); 1109 return 0; 1110 } 1111 1112 buf_len = EC_POINT_point2oct(a->group, a->pub_key, 1113 a->conv_form, NULL, 0, NULL); 1114 1115 if (out == NULL || buf_len == 0) 1116 /* out == NULL => just return the length of the octet string */ 1117 return buf_len; 1118 1119 if (*out == NULL) { 1120 if ((*out = OPENSSL_malloc(buf_len)) == NULL) { 1121 ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_MALLOC_FAILURE); 1122 return 0; 1123 } 1124 new_buffer = 1; 1125 } 1126 if (!EC_POINT_point2oct(a->group, a->pub_key, a->conv_form, 1127 *out, buf_len, NULL)) { 1128 ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_EC_LIB); 1129 if (new_buffer) { 1130 OPENSSL_free(*out); 1131 *out = NULL; 1132 } 1133 return 0; 1134 } 1135 if (!new_buffer) 1136 *out += buf_len; 1137 return buf_len; 1138 } 1139 1140 ASN1_SEQUENCE(ECDSA_SIG) = { 1141 ASN1_SIMPLE(ECDSA_SIG, r, CBIGNUM), 1142 ASN1_SIMPLE(ECDSA_SIG, s, CBIGNUM) 1143 } static_ASN1_SEQUENCE_END(ECDSA_SIG) 1144 1145 DECLARE_ASN1_FUNCTIONS_const(ECDSA_SIG) 1146 DECLARE_ASN1_ENCODE_FUNCTIONS_const(ECDSA_SIG, ECDSA_SIG) 1147 IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(ECDSA_SIG, ECDSA_SIG, ECDSA_SIG) 1148 1149 ECDSA_SIG *ECDSA_SIG_new(void) 1150 { 1151 ECDSA_SIG *sig = OPENSSL_zalloc(sizeof(*sig)); 1152 if (sig == NULL) 1153 ECerr(EC_F_ECDSA_SIG_NEW, ERR_R_MALLOC_FAILURE); 1154 return sig; 1155 } 1156 1157 void ECDSA_SIG_free(ECDSA_SIG *sig) 1158 { 1159 if (sig == NULL) 1160 return; 1161 BN_clear_free(sig->r); 1162 BN_clear_free(sig->s); 1163 OPENSSL_free(sig); 1164 } 1165 1166 void ECDSA_SIG_get0(const ECDSA_SIG *sig, const BIGNUM **pr, const BIGNUM **ps) 1167 { 1168 if (pr != NULL) 1169 *pr = sig->r; 1170 if (ps != NULL) 1171 *ps = sig->s; 1172 } 1173 1174 const BIGNUM *ECDSA_SIG_get0_r(const ECDSA_SIG *sig) 1175 { 1176 return sig->r; 1177 } 1178 1179 const BIGNUM *ECDSA_SIG_get0_s(const ECDSA_SIG *sig) 1180 { 1181 return sig->s; 1182 } 1183 1184 int ECDSA_SIG_set0(ECDSA_SIG *sig, BIGNUM *r, BIGNUM *s) 1185 { 1186 if (r == NULL || s == NULL) 1187 return 0; 1188 BN_clear_free(sig->r); 1189 BN_clear_free(sig->s); 1190 sig->r = r; 1191 sig->s = s; 1192 return 1; 1193 } 1194 1195 int ECDSA_size(const EC_KEY *r) 1196 { 1197 int ret, i; 1198 ASN1_INTEGER bs; 1199 unsigned char buf[4]; 1200 const EC_GROUP *group; 1201 1202 if (r == NULL) 1203 return 0; 1204 group = EC_KEY_get0_group(r); 1205 if (group == NULL) 1206 return 0; 1207 1208 i = EC_GROUP_order_bits(group); 1209 if (i == 0) 1210 return 0; 1211 bs.length = (i + 7) / 8; 1212 bs.data = buf; 1213 bs.type = V_ASN1_INTEGER; 1214 /* If the top bit is set the asn1 encoding is 1 larger. */ 1215 buf[0] = 0xff; 1216 1217 i = i2d_ASN1_INTEGER(&bs, NULL); 1218 i += i; /* r and s */ 1219 ret = ASN1_object_size(1, i, V_ASN1_SEQUENCE); 1220 return ret; 1221 } 1222