test_suite_ecdsa.function (20614B)
1 /* BEGIN_HEADER */ 2 #include "mbedtls/ecdsa.h" 3 /* END_HEADER */ 4 5 /* BEGIN_DEPENDENCIES 6 * depends_on:MBEDTLS_ECDSA_C 7 * END_DEPENDENCIES 8 */ 9 10 /* BEGIN_CASE */ 11 void ecdsa_prim_zero(int id) 12 { 13 mbedtls_ecp_group grp; 14 mbedtls_ecp_point Q; 15 mbedtls_mpi d, r, s; 16 mbedtls_test_rnd_pseudo_info rnd_info; 17 unsigned char buf[MBEDTLS_MD_MAX_SIZE]; 18 19 mbedtls_ecp_group_init(&grp); 20 mbedtls_ecp_point_init(&Q); 21 mbedtls_mpi_init(&d); mbedtls_mpi_init(&r); mbedtls_mpi_init(&s); 22 memset(&rnd_info, 0x00, sizeof(mbedtls_test_rnd_pseudo_info)); 23 memset(buf, 0, sizeof(buf)); 24 25 TEST_ASSERT(mbedtls_ecp_group_load(&grp, id) == 0); 26 TEST_ASSERT(mbedtls_ecp_gen_keypair(&grp, &d, &Q, 27 &mbedtls_test_rnd_pseudo_rand, 28 &rnd_info) == 0); 29 30 TEST_ASSERT(mbedtls_ecdsa_sign(&grp, &r, &s, &d, buf, sizeof(buf), 31 &mbedtls_test_rnd_pseudo_rand, 32 &rnd_info) == 0); 33 TEST_ASSERT(mbedtls_ecdsa_verify(&grp, buf, sizeof(buf), &Q, &r, &s) == 0); 34 35 exit: 36 mbedtls_ecp_group_free(&grp); 37 mbedtls_ecp_point_free(&Q); 38 mbedtls_mpi_free(&d); mbedtls_mpi_free(&r); mbedtls_mpi_free(&s); 39 } 40 /* END_CASE */ 41 42 /* BEGIN_CASE */ 43 void ecdsa_prim_random(int id) 44 { 45 mbedtls_ecp_group grp; 46 mbedtls_ecp_point Q; 47 mbedtls_mpi d, r, s; 48 mbedtls_test_rnd_pseudo_info rnd_info; 49 unsigned char buf[MBEDTLS_MD_MAX_SIZE]; 50 51 mbedtls_ecp_group_init(&grp); 52 mbedtls_ecp_point_init(&Q); 53 mbedtls_mpi_init(&d); mbedtls_mpi_init(&r); mbedtls_mpi_init(&s); 54 memset(&rnd_info, 0x00, sizeof(mbedtls_test_rnd_pseudo_info)); 55 memset(buf, 0, sizeof(buf)); 56 57 /* prepare material for signature */ 58 TEST_ASSERT(mbedtls_test_rnd_pseudo_rand(&rnd_info, 59 buf, sizeof(buf)) == 0); 60 TEST_ASSERT(mbedtls_ecp_group_load(&grp, id) == 0); 61 TEST_ASSERT(mbedtls_ecp_gen_keypair(&grp, &d, &Q, 62 &mbedtls_test_rnd_pseudo_rand, 63 &rnd_info) == 0); 64 65 TEST_ASSERT(mbedtls_ecdsa_sign(&grp, &r, &s, &d, buf, sizeof(buf), 66 &mbedtls_test_rnd_pseudo_rand, 67 &rnd_info) == 0); 68 TEST_ASSERT(mbedtls_ecdsa_verify(&grp, buf, sizeof(buf), &Q, &r, &s) == 0); 69 70 exit: 71 mbedtls_ecp_group_free(&grp); 72 mbedtls_ecp_point_free(&Q); 73 mbedtls_mpi_free(&d); mbedtls_mpi_free(&r); mbedtls_mpi_free(&s); 74 } 75 /* END_CASE */ 76 77 /* BEGIN_CASE */ 78 void ecdsa_prim_test_vectors(int id, char *d_str, char *xQ_str, 79 char *yQ_str, data_t *rnd_buf, 80 data_t *hash, char *r_str, char *s_str, 81 int result) 82 { 83 mbedtls_ecp_group grp; 84 mbedtls_ecp_point Q; 85 mbedtls_mpi d, r, s, r_check, s_check, zero; 86 mbedtls_test_rnd_buf_info rnd_info; 87 88 mbedtls_ecp_group_init(&grp); 89 mbedtls_ecp_point_init(&Q); 90 mbedtls_mpi_init(&d); mbedtls_mpi_init(&r); mbedtls_mpi_init(&s); 91 mbedtls_mpi_init(&r_check); mbedtls_mpi_init(&s_check); 92 mbedtls_mpi_init(&zero); 93 94 TEST_ASSERT(mbedtls_ecp_group_load(&grp, id) == 0); 95 TEST_ASSERT(mbedtls_ecp_point_read_string(&Q, 16, xQ_str, yQ_str) == 0); 96 TEST_ASSERT(mbedtls_test_read_mpi(&d, d_str) == 0); 97 TEST_ASSERT(mbedtls_test_read_mpi(&r_check, r_str) == 0); 98 TEST_ASSERT(mbedtls_test_read_mpi(&s_check, s_str) == 0); 99 rnd_info.fallback_f_rng = mbedtls_test_rnd_std_rand; 100 rnd_info.fallback_p_rng = NULL; 101 rnd_info.buf = rnd_buf->x; 102 rnd_info.length = rnd_buf->len; 103 104 /* Fix rnd_buf->x by shifting it left if necessary */ 105 if (grp.nbits % 8 != 0) { 106 unsigned char shift = 8 - (grp.nbits % 8); 107 size_t i; 108 109 for (i = 0; i < rnd_info.length - 1; i++) { 110 rnd_buf->x[i] = rnd_buf->x[i] << shift | rnd_buf->x[i+1] >> (8 - shift); 111 } 112 113 rnd_buf->x[rnd_info.length-1] <<= shift; 114 } 115 116 TEST_ASSERT(mbedtls_ecdsa_sign(&grp, &r, &s, &d, hash->x, hash->len, 117 mbedtls_test_rnd_buffer_rand, &rnd_info) == result); 118 119 if (result == 0) { 120 /* Check we generated the expected values */ 121 TEST_EQUAL(mbedtls_mpi_cmp_mpi(&r, &r_check), 0); 122 TEST_EQUAL(mbedtls_mpi_cmp_mpi(&s, &s_check), 0); 123 124 /* Valid signature */ 125 TEST_EQUAL(mbedtls_ecdsa_verify(&grp, hash->x, hash->len, 126 &Q, &r_check, &s_check), 0); 127 128 /* Invalid signature: wrong public key (G instead of Q) */ 129 TEST_EQUAL(mbedtls_ecdsa_verify(&grp, hash->x, hash->len, 130 &grp.G, &r_check, &s_check), MBEDTLS_ERR_ECP_VERIFY_FAILED); 131 132 /* Invalid signatures: r or s or both one off */ 133 TEST_EQUAL(mbedtls_mpi_sub_int(&r, &r_check, 1), 0); 134 TEST_EQUAL(mbedtls_mpi_add_int(&s, &s_check, 1), 0); 135 136 TEST_EQUAL(mbedtls_ecdsa_verify(&grp, hash->x, hash->len, &Q, 137 &r, &s_check), MBEDTLS_ERR_ECP_VERIFY_FAILED); 138 TEST_EQUAL(mbedtls_ecdsa_verify(&grp, hash->x, hash->len, &Q, 139 &r_check, &s), MBEDTLS_ERR_ECP_VERIFY_FAILED); 140 TEST_EQUAL(mbedtls_ecdsa_verify(&grp, hash->x, hash->len, &Q, 141 &r, &s), MBEDTLS_ERR_ECP_VERIFY_FAILED); 142 143 /* Invalid signatures: r, s or both (CVE-2022-21449) are zero */ 144 TEST_EQUAL(mbedtls_mpi_lset(&zero, 0), 0); 145 146 TEST_EQUAL(mbedtls_ecdsa_verify(&grp, hash->x, hash->len, &Q, 147 &zero, &s_check), MBEDTLS_ERR_ECP_VERIFY_FAILED); 148 TEST_EQUAL(mbedtls_ecdsa_verify(&grp, hash->x, hash->len, &Q, 149 &r_check, &zero), MBEDTLS_ERR_ECP_VERIFY_FAILED); 150 TEST_EQUAL(mbedtls_ecdsa_verify(&grp, hash->x, hash->len, &Q, 151 &zero, &zero), MBEDTLS_ERR_ECP_VERIFY_FAILED); 152 153 /* Invalid signatures: r, s or both are == N */ 154 TEST_EQUAL(mbedtls_ecdsa_verify(&grp, hash->x, hash->len, &Q, 155 &grp.N, &s_check), MBEDTLS_ERR_ECP_VERIFY_FAILED); 156 TEST_EQUAL(mbedtls_ecdsa_verify(&grp, hash->x, hash->len, &Q, 157 &r_check, &grp.N), MBEDTLS_ERR_ECP_VERIFY_FAILED); 158 TEST_EQUAL(mbedtls_ecdsa_verify(&grp, hash->x, hash->len, &Q, 159 &grp.N, &grp.N), MBEDTLS_ERR_ECP_VERIFY_FAILED); 160 161 /* Invalid signatures: r, s or both are negative */ 162 TEST_EQUAL(mbedtls_mpi_sub_mpi(&r, &r_check, &grp.N), 0); 163 TEST_EQUAL(mbedtls_mpi_sub_mpi(&s, &s_check, &grp.N), 0); 164 165 TEST_EQUAL(mbedtls_ecdsa_verify(&grp, hash->x, hash->len, &Q, 166 &r, &s_check), MBEDTLS_ERR_ECP_VERIFY_FAILED); 167 TEST_EQUAL(mbedtls_ecdsa_verify(&grp, hash->x, hash->len, &Q, 168 &r_check, &s), MBEDTLS_ERR_ECP_VERIFY_FAILED); 169 TEST_EQUAL(mbedtls_ecdsa_verify(&grp, hash->x, hash->len, &Q, 170 &r, &s), MBEDTLS_ERR_ECP_VERIFY_FAILED); 171 172 /* Invalid signatures: r or s or both are > N */ 173 TEST_EQUAL(mbedtls_mpi_add_mpi(&r, &r_check, &grp.N), 0); 174 TEST_EQUAL(mbedtls_mpi_add_mpi(&s, &s_check, &grp.N), 0); 175 176 TEST_EQUAL(mbedtls_ecdsa_verify(&grp, hash->x, hash->len, &Q, 177 &r, &s_check), MBEDTLS_ERR_ECP_VERIFY_FAILED); 178 TEST_EQUAL(mbedtls_ecdsa_verify(&grp, hash->x, hash->len, &Q, 179 &r_check, &s), MBEDTLS_ERR_ECP_VERIFY_FAILED); 180 TEST_EQUAL(mbedtls_ecdsa_verify(&grp, hash->x, hash->len, &Q, 181 &r, &s), MBEDTLS_ERR_ECP_VERIFY_FAILED); 182 } 183 184 exit: 185 mbedtls_ecp_group_free(&grp); 186 mbedtls_ecp_point_free(&Q); 187 mbedtls_mpi_free(&d); mbedtls_mpi_free(&r); mbedtls_mpi_free(&s); 188 mbedtls_mpi_free(&r_check); mbedtls_mpi_free(&s_check); 189 mbedtls_mpi_free(&zero); 190 } 191 /* END_CASE */ 192 193 /* BEGIN_CASE depends_on:MBEDTLS_ECDSA_DETERMINISTIC */ 194 void ecdsa_det_test_vectors(int id, char *d_str, int md_alg, data_t *hash, 195 char *r_str, char *s_str) 196 { 197 mbedtls_ecp_group grp; 198 mbedtls_mpi d, r, s, r_check, s_check; 199 mbedtls_ecp_group_init(&grp); 200 mbedtls_mpi_init(&d); mbedtls_mpi_init(&r); mbedtls_mpi_init(&s); 201 mbedtls_mpi_init(&r_check); mbedtls_mpi_init(&s_check); 202 203 MD_PSA_INIT(); 204 205 TEST_ASSERT(mbedtls_ecp_group_load(&grp, id) == 0); 206 TEST_ASSERT(mbedtls_test_read_mpi(&d, d_str) == 0); 207 TEST_ASSERT(mbedtls_test_read_mpi(&r_check, r_str) == 0); 208 TEST_ASSERT(mbedtls_test_read_mpi(&s_check, s_str) == 0); 209 210 TEST_ASSERT( 211 mbedtls_ecdsa_sign_det_ext(&grp, &r, &s, &d, 212 hash->x, hash->len, md_alg, 213 mbedtls_test_rnd_std_rand, 214 NULL) 215 == 0); 216 217 TEST_ASSERT(mbedtls_mpi_cmp_mpi(&r, &r_check) == 0); 218 TEST_ASSERT(mbedtls_mpi_cmp_mpi(&s, &s_check) == 0); 219 220 exit: 221 mbedtls_ecp_group_free(&grp); 222 mbedtls_mpi_free(&d); mbedtls_mpi_free(&r); mbedtls_mpi_free(&s); 223 mbedtls_mpi_free(&r_check); mbedtls_mpi_free(&s_check); 224 MD_PSA_DONE(); 225 } 226 /* END_CASE */ 227 228 /* BEGIN_CASE depends_on:MBEDTLS_MD_CAN_SHA256 */ 229 void ecdsa_write_read_zero(int id) 230 { 231 mbedtls_ecdsa_context ctx; 232 mbedtls_test_rnd_pseudo_info rnd_info; 233 unsigned char hash[32]; 234 unsigned char sig[200]; 235 size_t sig_len, i; 236 237 mbedtls_ecdsa_init(&ctx); 238 memset(&rnd_info, 0x00, sizeof(mbedtls_test_rnd_pseudo_info)); 239 memset(hash, 0, sizeof(hash)); 240 memset(sig, 0x2a, sizeof(sig)); 241 242 MD_PSA_INIT(); 243 244 /* generate signing key */ 245 TEST_ASSERT(mbedtls_ecdsa_genkey(&ctx, id, 246 &mbedtls_test_rnd_pseudo_rand, 247 &rnd_info) == 0); 248 249 /* generate and write signature, then read and verify it */ 250 TEST_ASSERT(mbedtls_ecdsa_write_signature(&ctx, MBEDTLS_MD_SHA256, 251 hash, sizeof(hash), 252 sig, sizeof(sig), &sig_len, 253 &mbedtls_test_rnd_pseudo_rand, 254 &rnd_info) == 0); 255 TEST_ASSERT(mbedtls_ecdsa_read_signature(&ctx, hash, sizeof(hash), 256 sig, sig_len) == 0); 257 258 /* check we didn't write past the announced length */ 259 for (i = sig_len; i < sizeof(sig); i++) { 260 TEST_ASSERT(sig[i] == 0x2a); 261 } 262 263 /* try verification with invalid length */ 264 TEST_ASSERT(mbedtls_ecdsa_read_signature(&ctx, hash, sizeof(hash), 265 sig, sig_len - 1) != 0); 266 TEST_ASSERT(mbedtls_ecdsa_read_signature(&ctx, hash, sizeof(hash), 267 sig, sig_len + 1) != 0); 268 269 /* try invalid sequence tag */ 270 sig[0]++; 271 TEST_ASSERT(mbedtls_ecdsa_read_signature(&ctx, hash, sizeof(hash), 272 sig, sig_len) != 0); 273 sig[0]--; 274 275 /* try modifying r */ 276 sig[10]++; 277 TEST_ASSERT(mbedtls_ecdsa_read_signature(&ctx, hash, sizeof(hash), 278 sig, sig_len) == MBEDTLS_ERR_ECP_VERIFY_FAILED); 279 sig[10]--; 280 281 /* try modifying s */ 282 sig[sig_len - 1]++; 283 TEST_ASSERT(mbedtls_ecdsa_read_signature(&ctx, hash, sizeof(hash), 284 sig, sig_len) == MBEDTLS_ERR_ECP_VERIFY_FAILED); 285 sig[sig_len - 1]--; 286 287 exit: 288 mbedtls_ecdsa_free(&ctx); 289 MD_PSA_DONE(); 290 } 291 /* END_CASE */ 292 293 /* BEGIN_CASE depends_on:MBEDTLS_MD_CAN_SHA256 */ 294 void ecdsa_write_read_random(int id) 295 { 296 mbedtls_ecdsa_context ctx; 297 mbedtls_test_rnd_pseudo_info rnd_info; 298 unsigned char hash[32]; 299 unsigned char sig[200]; 300 size_t sig_len, i; 301 302 mbedtls_ecdsa_init(&ctx); 303 memset(&rnd_info, 0x00, sizeof(mbedtls_test_rnd_pseudo_info)); 304 memset(hash, 0, sizeof(hash)); 305 memset(sig, 0x2a, sizeof(sig)); 306 307 MD_PSA_INIT(); 308 309 /* prepare material for signature */ 310 TEST_ASSERT(mbedtls_test_rnd_pseudo_rand(&rnd_info, 311 hash, sizeof(hash)) == 0); 312 313 /* generate signing key */ 314 TEST_ASSERT(mbedtls_ecdsa_genkey(&ctx, id, 315 &mbedtls_test_rnd_pseudo_rand, 316 &rnd_info) == 0); 317 318 /* generate and write signature, then read and verify it */ 319 TEST_ASSERT(mbedtls_ecdsa_write_signature(&ctx, MBEDTLS_MD_SHA256, 320 hash, sizeof(hash), 321 sig, sizeof(sig), &sig_len, 322 &mbedtls_test_rnd_pseudo_rand, 323 &rnd_info) == 0); 324 TEST_ASSERT(mbedtls_ecdsa_read_signature(&ctx, hash, sizeof(hash), 325 sig, sig_len) == 0); 326 327 /* check we didn't write past the announced length */ 328 for (i = sig_len; i < sizeof(sig); i++) { 329 TEST_ASSERT(sig[i] == 0x2a); 330 } 331 332 /* try verification with invalid length */ 333 TEST_ASSERT(mbedtls_ecdsa_read_signature(&ctx, hash, sizeof(hash), 334 sig, sig_len - 1) != 0); 335 TEST_ASSERT(mbedtls_ecdsa_read_signature(&ctx, hash, sizeof(hash), 336 sig, sig_len + 1) != 0); 337 338 /* try invalid sequence tag */ 339 sig[0]++; 340 TEST_ASSERT(mbedtls_ecdsa_read_signature(&ctx, hash, sizeof(hash), 341 sig, sig_len) != 0); 342 sig[0]--; 343 344 /* try modifying r */ 345 sig[10]++; 346 TEST_ASSERT(mbedtls_ecdsa_read_signature(&ctx, hash, sizeof(hash), 347 sig, sig_len) == MBEDTLS_ERR_ECP_VERIFY_FAILED); 348 sig[10]--; 349 350 /* try modifying s */ 351 sig[sig_len - 1]++; 352 TEST_ASSERT(mbedtls_ecdsa_read_signature(&ctx, hash, sizeof(hash), 353 sig, sig_len) == MBEDTLS_ERR_ECP_VERIFY_FAILED); 354 sig[sig_len - 1]--; 355 356 exit: 357 mbedtls_ecdsa_free(&ctx); 358 MD_PSA_DONE(); 359 } 360 /* END_CASE */ 361 362 /* BEGIN_CASE depends_on:MBEDTLS_ECP_RESTARTABLE */ 363 void ecdsa_read_restart(int id, data_t *pk, data_t *hash, data_t *sig, 364 int max_ops, int min_restart, int max_restart) 365 { 366 mbedtls_ecdsa_context ctx; 367 mbedtls_ecdsa_restart_ctx rs_ctx; 368 int ret, cnt_restart; 369 370 mbedtls_ecdsa_init(&ctx); 371 mbedtls_ecdsa_restart_init(&rs_ctx); 372 373 TEST_ASSERT(mbedtls_ecp_group_load(&ctx.grp, id) == 0); 374 TEST_ASSERT(mbedtls_ecp_point_read_binary(&ctx.grp, &ctx.Q, 375 pk->x, pk->len) == 0); 376 377 mbedtls_ecp_set_max_ops(max_ops); 378 379 cnt_restart = 0; 380 do { 381 ret = mbedtls_ecdsa_read_signature_restartable(&ctx, 382 hash->x, hash->len, sig->x, sig->len, 383 &rs_ctx); 384 } while (ret == MBEDTLS_ERR_ECP_IN_PROGRESS && ++cnt_restart); 385 386 TEST_ASSERT(ret == 0); 387 TEST_ASSERT(cnt_restart >= min_restart); 388 TEST_ASSERT(cnt_restart <= max_restart); 389 390 /* try modifying r */ 391 392 TEST_ASSERT(sig->len > 10); 393 sig->x[10]++; 394 do { 395 ret = mbedtls_ecdsa_read_signature_restartable(&ctx, 396 hash->x, hash->len, sig->x, sig->len, 397 &rs_ctx); 398 } while (ret == MBEDTLS_ERR_ECP_IN_PROGRESS); 399 TEST_ASSERT(ret == MBEDTLS_ERR_ECP_VERIFY_FAILED); 400 sig->x[10]--; 401 402 /* try modifying s */ 403 sig->x[sig->len - 1]++; 404 do { 405 ret = mbedtls_ecdsa_read_signature_restartable(&ctx, 406 hash->x, hash->len, sig->x, sig->len, 407 &rs_ctx); 408 } while (ret == MBEDTLS_ERR_ECP_IN_PROGRESS); 409 TEST_ASSERT(ret == MBEDTLS_ERR_ECP_VERIFY_FAILED); 410 sig->x[sig->len - 1]--; 411 412 /* Do we leak memory when aborting an operation? 413 * This test only makes sense when we actually restart */ 414 if (min_restart > 0) { 415 ret = mbedtls_ecdsa_read_signature_restartable(&ctx, 416 hash->x, hash->len, sig->x, sig->len, 417 &rs_ctx); 418 TEST_ASSERT(ret == MBEDTLS_ERR_ECP_IN_PROGRESS); 419 } 420 421 exit: 422 mbedtls_ecdsa_free(&ctx); 423 mbedtls_ecdsa_restart_free(&rs_ctx); 424 } 425 /* END_CASE */ 426 427 /* BEGIN_CASE depends_on:MBEDTLS_ECP_RESTARTABLE:MBEDTLS_ECDSA_DETERMINISTIC */ 428 void ecdsa_write_restart(int id, char *d_str, int md_alg, 429 data_t *hash, data_t *sig_check, 430 int max_ops, int min_restart, int max_restart) 431 { 432 int ret, cnt_restart; 433 mbedtls_ecdsa_restart_ctx rs_ctx; 434 mbedtls_ecdsa_context ctx; 435 unsigned char sig[MBEDTLS_ECDSA_MAX_LEN]; 436 size_t slen; 437 438 mbedtls_ecdsa_restart_init(&rs_ctx); 439 mbedtls_ecdsa_init(&ctx); 440 memset(sig, 0, sizeof(sig)); 441 442 MD_PSA_INIT(); 443 444 TEST_ASSERT(mbedtls_ecp_group_load(&ctx.grp, id) == 0); 445 TEST_ASSERT(mbedtls_test_read_mpi(&ctx.d, d_str) == 0); 446 447 mbedtls_ecp_set_max_ops(max_ops); 448 449 slen = sizeof(sig); 450 cnt_restart = 0; 451 do { 452 ret = mbedtls_ecdsa_write_signature_restartable(&ctx, 453 md_alg, 454 hash->x, 455 hash->len, 456 sig, 457 sizeof(sig), 458 &slen, 459 mbedtls_test_rnd_std_rand, 460 NULL, 461 &rs_ctx); 462 } while (ret == MBEDTLS_ERR_ECP_IN_PROGRESS && ++cnt_restart); 463 464 TEST_ASSERT(ret == 0); 465 TEST_ASSERT(slen == sig_check->len); 466 TEST_ASSERT(memcmp(sig, sig_check->x, slen) == 0); 467 468 TEST_ASSERT(cnt_restart >= min_restart); 469 TEST_ASSERT(cnt_restart <= max_restart); 470 471 /* Do we leak memory when aborting an operation? 472 * This test only makes sense when we actually restart */ 473 if (min_restart > 0) { 474 ret = mbedtls_ecdsa_write_signature_restartable(&ctx, 475 md_alg, 476 hash->x, 477 hash->len, 478 sig, 479 sizeof(sig), 480 &slen, 481 mbedtls_test_rnd_std_rand, 482 NULL, 483 &rs_ctx); 484 TEST_ASSERT(ret == MBEDTLS_ERR_ECP_IN_PROGRESS); 485 } 486 487 exit: 488 mbedtls_ecdsa_restart_free(&rs_ctx); 489 mbedtls_ecdsa_free(&ctx); 490 MD_PSA_DONE(); 491 } 492 /* END_CASE */ 493 494 /* BEGIN_CASE */ 495 void ecdsa_verify(int grp_id, char *x, char *y, char *r, char *s, data_t *content, int expected) 496 { 497 mbedtls_ecdsa_context ctx; 498 mbedtls_mpi sig_r, sig_s; 499 500 mbedtls_ecdsa_init(&ctx); 501 mbedtls_mpi_init(&sig_r); 502 mbedtls_mpi_init(&sig_s); 503 504 /* Prepare ECP group context */ 505 TEST_EQUAL(mbedtls_ecp_group_load(&ctx.grp, grp_id), 0); 506 507 /* Prepare public key */ 508 TEST_EQUAL(mbedtls_test_read_mpi(&ctx.Q.X, x), 0); 509 TEST_EQUAL(mbedtls_test_read_mpi(&ctx.Q.Y, y), 0); 510 TEST_EQUAL(mbedtls_mpi_lset(&ctx.Q.Z, 1), 0); 511 512 /* Prepare signature R & S */ 513 TEST_EQUAL(mbedtls_test_read_mpi(&sig_r, r), 0); 514 TEST_EQUAL(mbedtls_test_read_mpi(&sig_s, s), 0); 515 516 /* Test whether public key has expected validity */ 517 TEST_EQUAL(mbedtls_ecp_check_pubkey(&ctx.grp, &ctx.Q), 518 expected == MBEDTLS_ERR_ECP_INVALID_KEY ? MBEDTLS_ERR_ECP_INVALID_KEY : 0); 519 520 /* Verification */ 521 int result = mbedtls_ecdsa_verify(&ctx.grp, content->x, content->len, &ctx.Q, &sig_r, &sig_s); 522 523 TEST_EQUAL(result, expected); 524 exit: 525 mbedtls_ecdsa_free(&ctx); 526 mbedtls_mpi_free(&sig_r); 527 mbedtls_mpi_free(&sig_s); 528 } 529 /* END_CASE */