/* BEGIN_HEADER */ #include "mbedtls/ecdsa.h" /* END_HEADER */ /* BEGIN_DEPENDENCIES * depends_on:MBEDTLS_ECDSA_C * END_DEPENDENCIES */ /* BEGIN_CASE depends_on:MBEDTLS_CHECK_PARAMS:!MBEDTLS_PARAM_FAILED_ALT */ void ecdsa_invalid_param() { mbedtls_ecdsa_context ctx; mbedtls_ecp_keypair key; mbedtls_ecp_group grp; mbedtls_ecp_group_id valid_group = MBEDTLS_ECP_DP_SECP192R1; mbedtls_ecp_point P; mbedtls_md_type_t valid_md = MBEDTLS_MD_SHA256; mbedtls_mpi m; size_t slen; unsigned char buf[42] = { 0 }; mbedtls_ecdsa_init(&ctx); mbedtls_ecp_keypair_init(&key); mbedtls_ecp_group_init(&grp); mbedtls_ecp_point_init(&P); mbedtls_mpi_init(&m); TEST_INVALID_PARAM(mbedtls_ecdsa_init(NULL)); TEST_VALID_PARAM(mbedtls_ecdsa_free(NULL)); #if defined(MBEDTLS_ECP_RESTARTABLE) TEST_INVALID_PARAM(mbedtls_ecdsa_restart_init(NULL)); TEST_VALID_PARAM(mbedtls_ecdsa_restart_free(NULL)); #endif /* MBEDTLS_ECP_RESTARTABLE */ TEST_INVALID_PARAM_RET(MBEDTLS_ERR_ECP_BAD_INPUT_DATA, mbedtls_ecdsa_sign(NULL, &m, &m, &m, buf, sizeof(buf), mbedtls_test_rnd_std_rand, NULL)); TEST_INVALID_PARAM_RET(MBEDTLS_ERR_ECP_BAD_INPUT_DATA, mbedtls_ecdsa_sign(&grp, NULL, &m, &m, buf, sizeof(buf), mbedtls_test_rnd_std_rand, NULL)); TEST_INVALID_PARAM_RET(MBEDTLS_ERR_ECP_BAD_INPUT_DATA, mbedtls_ecdsa_sign(&grp, &m, NULL, &m, buf, sizeof(buf), mbedtls_test_rnd_std_rand, NULL)); TEST_INVALID_PARAM_RET(MBEDTLS_ERR_ECP_BAD_INPUT_DATA, mbedtls_ecdsa_sign(&grp, &m, &m, NULL, buf, sizeof(buf), mbedtls_test_rnd_std_rand, NULL)); TEST_INVALID_PARAM_RET(MBEDTLS_ERR_ECP_BAD_INPUT_DATA, mbedtls_ecdsa_sign(&grp, &m, &m, &m, NULL, sizeof(buf), mbedtls_test_rnd_std_rand, NULL)); TEST_INVALID_PARAM_RET(MBEDTLS_ERR_ECP_BAD_INPUT_DATA, mbedtls_ecdsa_sign(&grp, &m, &m, &m, buf, sizeof(buf), NULL, NULL)); #if defined(MBEDTLS_ECDSA_DETERMINISTIC) TEST_INVALID_PARAM_RET(MBEDTLS_ERR_ECP_BAD_INPUT_DATA, mbedtls_ecdsa_sign_det_ext(NULL, &m, &m, &m, buf, sizeof(buf), valid_md, mbedtls_test_rnd_std_rand, NULL)); TEST_INVALID_PARAM_RET(MBEDTLS_ERR_ECP_BAD_INPUT_DATA, mbedtls_ecdsa_sign_det_ext(&grp, NULL, &m, &m, buf, sizeof(buf), valid_md, mbedtls_test_rnd_std_rand, NULL)); TEST_INVALID_PARAM_RET(MBEDTLS_ERR_ECP_BAD_INPUT_DATA, mbedtls_ecdsa_sign_det_ext(&grp, &m, NULL, &m, buf, sizeof(buf), valid_md, mbedtls_test_rnd_std_rand, NULL)); TEST_INVALID_PARAM_RET(MBEDTLS_ERR_ECP_BAD_INPUT_DATA, mbedtls_ecdsa_sign_det_ext(&grp, &m, &m, NULL, buf, sizeof(buf), valid_md, mbedtls_test_rnd_std_rand, NULL)); TEST_INVALID_PARAM_RET(MBEDTLS_ERR_ECP_BAD_INPUT_DATA, mbedtls_ecdsa_sign_det_ext(&grp, &m, &m, &m, NULL, sizeof(buf), valid_md, mbedtls_test_rnd_std_rand, NULL)); #endif /* MBEDTLS_ECDSA_DETERMINISTIC */ TEST_INVALID_PARAM_RET(MBEDTLS_ERR_ECP_BAD_INPUT_DATA, mbedtls_ecdsa_verify(NULL, buf, sizeof(buf), &P, &m, &m)); TEST_INVALID_PARAM_RET(MBEDTLS_ERR_ECP_BAD_INPUT_DATA, mbedtls_ecdsa_verify(&grp, NULL, sizeof(buf), &P, &m, &m)); TEST_INVALID_PARAM_RET(MBEDTLS_ERR_ECP_BAD_INPUT_DATA, mbedtls_ecdsa_verify(&grp, buf, sizeof(buf), NULL, &m, &m)); TEST_INVALID_PARAM_RET(MBEDTLS_ERR_ECP_BAD_INPUT_DATA, mbedtls_ecdsa_verify(&grp, buf, sizeof(buf), &P, NULL, &m)); TEST_INVALID_PARAM_RET(MBEDTLS_ERR_ECP_BAD_INPUT_DATA, mbedtls_ecdsa_verify(&grp, buf, sizeof(buf), &P, &m, NULL)); TEST_INVALID_PARAM_RET(MBEDTLS_ERR_ECP_BAD_INPUT_DATA, mbedtls_ecdsa_write_signature(NULL, valid_md, buf, sizeof(buf), buf, &slen, mbedtls_test_rnd_std_rand, NULL)); TEST_INVALID_PARAM_RET(MBEDTLS_ERR_ECP_BAD_INPUT_DATA, mbedtls_ecdsa_write_signature(&ctx, valid_md, NULL, sizeof(buf), buf, &slen, mbedtls_test_rnd_std_rand, NULL)); TEST_INVALID_PARAM_RET(MBEDTLS_ERR_ECP_BAD_INPUT_DATA, mbedtls_ecdsa_write_signature(&ctx, valid_md, buf, sizeof(buf), NULL, &slen, mbedtls_test_rnd_std_rand, NULL)); TEST_INVALID_PARAM_RET(MBEDTLS_ERR_ECP_BAD_INPUT_DATA, mbedtls_ecdsa_write_signature(&ctx, valid_md, buf, sizeof(buf), buf, NULL, mbedtls_test_rnd_std_rand, NULL)); TEST_INVALID_PARAM_RET(MBEDTLS_ERR_ECP_BAD_INPUT_DATA, mbedtls_ecdsa_write_signature_restartable(NULL, valid_md, buf, sizeof(buf), buf, &slen, mbedtls_test_rnd_std_rand, NULL, NULL)); TEST_INVALID_PARAM_RET(MBEDTLS_ERR_ECP_BAD_INPUT_DATA, mbedtls_ecdsa_write_signature_restartable(&ctx, valid_md, NULL, sizeof(buf), buf, &slen, mbedtls_test_rnd_std_rand, NULL, NULL)); TEST_INVALID_PARAM_RET(MBEDTLS_ERR_ECP_BAD_INPUT_DATA, mbedtls_ecdsa_write_signature_restartable(&ctx, valid_md, buf, sizeof(buf), NULL, &slen, mbedtls_test_rnd_std_rand, NULL, NULL)); TEST_INVALID_PARAM_RET(MBEDTLS_ERR_ECP_BAD_INPUT_DATA, mbedtls_ecdsa_write_signature_restartable(&ctx, valid_md, buf, sizeof(buf), buf, NULL, mbedtls_test_rnd_std_rand, NULL, NULL)); TEST_INVALID_PARAM_RET(MBEDTLS_ERR_ECP_BAD_INPUT_DATA, mbedtls_ecdsa_read_signature(NULL, buf, sizeof(buf), buf, sizeof(buf))); TEST_INVALID_PARAM_RET(MBEDTLS_ERR_ECP_BAD_INPUT_DATA, mbedtls_ecdsa_read_signature(&ctx, NULL, sizeof(buf), buf, sizeof(buf))); TEST_INVALID_PARAM_RET(MBEDTLS_ERR_ECP_BAD_INPUT_DATA, mbedtls_ecdsa_read_signature(&ctx, buf, sizeof(buf), NULL, sizeof(buf))); TEST_INVALID_PARAM_RET(MBEDTLS_ERR_ECP_BAD_INPUT_DATA, mbedtls_ecdsa_read_signature_restartable(NULL, buf, sizeof(buf), buf, sizeof(buf), NULL)); TEST_INVALID_PARAM_RET(MBEDTLS_ERR_ECP_BAD_INPUT_DATA, mbedtls_ecdsa_read_signature_restartable(&ctx, NULL, sizeof(buf), buf, sizeof(buf), NULL)); TEST_INVALID_PARAM_RET(MBEDTLS_ERR_ECP_BAD_INPUT_DATA, mbedtls_ecdsa_read_signature_restartable(&ctx, buf, sizeof(buf), NULL, sizeof(buf), NULL)); TEST_INVALID_PARAM_RET(MBEDTLS_ERR_ECP_BAD_INPUT_DATA, mbedtls_ecdsa_genkey(NULL, valid_group, mbedtls_test_rnd_std_rand, NULL)); TEST_INVALID_PARAM_RET(MBEDTLS_ERR_ECP_BAD_INPUT_DATA, mbedtls_ecdsa_genkey(&ctx, valid_group, NULL, NULL)); TEST_INVALID_PARAM_RET(MBEDTLS_ERR_ECP_BAD_INPUT_DATA, mbedtls_ecdsa_from_keypair(NULL, &key)); TEST_INVALID_PARAM_RET(MBEDTLS_ERR_ECP_BAD_INPUT_DATA, mbedtls_ecdsa_from_keypair(&ctx, NULL)); exit: mbedtls_ecdsa_free(&ctx); mbedtls_ecp_keypair_free(&key); mbedtls_ecp_group_free(&grp); mbedtls_ecp_point_free(&P); mbedtls_mpi_free(&m); return; } /* END_CASE */ /* BEGIN_CASE */ void ecdsa_prim_zero(int id) { mbedtls_ecp_group grp; mbedtls_ecp_point Q; mbedtls_mpi d, r, s; mbedtls_test_rnd_pseudo_info rnd_info; unsigned char buf[MBEDTLS_MD_MAX_SIZE]; mbedtls_ecp_group_init(&grp); mbedtls_ecp_point_init(&Q); mbedtls_mpi_init(&d); mbedtls_mpi_init(&r); mbedtls_mpi_init(&s); memset(&rnd_info, 0x00, sizeof(mbedtls_test_rnd_pseudo_info)); memset(buf, 0, sizeof(buf)); TEST_ASSERT(mbedtls_ecp_group_load(&grp, id) == 0); TEST_ASSERT(mbedtls_ecp_gen_keypair(&grp, &d, &Q, &mbedtls_test_rnd_pseudo_rand, &rnd_info) == 0); TEST_ASSERT(mbedtls_ecdsa_sign(&grp, &r, &s, &d, buf, sizeof(buf), &mbedtls_test_rnd_pseudo_rand, &rnd_info) == 0); TEST_ASSERT(mbedtls_ecdsa_verify(&grp, buf, sizeof(buf), &Q, &r, &s) == 0); exit: mbedtls_ecp_group_free(&grp); mbedtls_ecp_point_free(&Q); mbedtls_mpi_free(&d); mbedtls_mpi_free(&r); mbedtls_mpi_free(&s); } /* END_CASE */ /* BEGIN_CASE */ void ecdsa_prim_random(int id) { mbedtls_ecp_group grp; mbedtls_ecp_point Q; mbedtls_mpi d, r, s; mbedtls_test_rnd_pseudo_info rnd_info; unsigned char buf[MBEDTLS_MD_MAX_SIZE]; mbedtls_ecp_group_init(&grp); mbedtls_ecp_point_init(&Q); mbedtls_mpi_init(&d); mbedtls_mpi_init(&r); mbedtls_mpi_init(&s); memset(&rnd_info, 0x00, sizeof(mbedtls_test_rnd_pseudo_info)); memset(buf, 0, sizeof(buf)); /* prepare material for signature */ TEST_ASSERT(mbedtls_test_rnd_pseudo_rand(&rnd_info, buf, sizeof(buf)) == 0); TEST_ASSERT(mbedtls_ecp_group_load(&grp, id) == 0); TEST_ASSERT(mbedtls_ecp_gen_keypair(&grp, &d, &Q, &mbedtls_test_rnd_pseudo_rand, &rnd_info) == 0); TEST_ASSERT(mbedtls_ecdsa_sign(&grp, &r, &s, &d, buf, sizeof(buf), &mbedtls_test_rnd_pseudo_rand, &rnd_info) == 0); TEST_ASSERT(mbedtls_ecdsa_verify(&grp, buf, sizeof(buf), &Q, &r, &s) == 0); exit: mbedtls_ecp_group_free(&grp); mbedtls_ecp_point_free(&Q); mbedtls_mpi_free(&d); mbedtls_mpi_free(&r); mbedtls_mpi_free(&s); } /* END_CASE */ /* BEGIN_CASE */ void ecdsa_prim_test_vectors(int id, char *d_str, char *xQ_str, char *yQ_str, data_t *rnd_buf, data_t *hash, char *r_str, char *s_str, int result) { mbedtls_ecp_group grp; mbedtls_ecp_point Q; mbedtls_mpi d, r, s, r_check, s_check, zero; mbedtls_test_rnd_buf_info rnd_info; mbedtls_ecp_group_init(&grp); mbedtls_ecp_point_init(&Q); mbedtls_mpi_init(&d); mbedtls_mpi_init(&r); mbedtls_mpi_init(&s); mbedtls_mpi_init(&r_check); mbedtls_mpi_init(&s_check); mbedtls_mpi_init(&zero); TEST_ASSERT(mbedtls_ecp_group_load(&grp, id) == 0); TEST_ASSERT(mbedtls_ecp_point_read_string(&Q, 16, xQ_str, yQ_str) == 0); TEST_ASSERT(mbedtls_test_read_mpi(&d, d_str) == 0); TEST_ASSERT(mbedtls_test_read_mpi(&r_check, r_str) == 0); TEST_ASSERT(mbedtls_test_read_mpi(&s_check, s_str) == 0); rnd_info.fallback_f_rng = mbedtls_test_rnd_std_rand; rnd_info.fallback_p_rng = NULL; rnd_info.buf = rnd_buf->x; rnd_info.length = rnd_buf->len; /* Fix rnd_buf->x by shifting it left if necessary */ if (grp.nbits % 8 != 0) { unsigned char shift = 8 - (grp.nbits % 8); size_t i; for (i = 0; i < rnd_info.length - 1; i++) { rnd_buf->x[i] = rnd_buf->x[i] << shift | rnd_buf->x[i+1] >> (8 - shift); } rnd_buf->x[rnd_info.length-1] <<= shift; } TEST_ASSERT(mbedtls_ecdsa_sign(&grp, &r, &s, &d, hash->x, hash->len, mbedtls_test_rnd_buffer_rand, &rnd_info) == result); if (result == 0) { /* Check we generated the expected values */ TEST_EQUAL(mbedtls_mpi_cmp_mpi(&r, &r_check), 0); TEST_EQUAL(mbedtls_mpi_cmp_mpi(&s, &s_check), 0); /* Valid signature */ TEST_EQUAL(mbedtls_ecdsa_verify(&grp, hash->x, hash->len, &Q, &r_check, &s_check), 0); /* Invalid signature: wrong public key (G instead of Q) */ TEST_EQUAL(mbedtls_ecdsa_verify(&grp, hash->x, hash->len, &grp.G, &r_check, &s_check), MBEDTLS_ERR_ECP_VERIFY_FAILED); /* Invalid signatures: r or s or both one off */ TEST_EQUAL(mbedtls_mpi_sub_int(&r, &r_check, 1), 0); TEST_EQUAL(mbedtls_mpi_add_int(&s, &s_check, 1), 0); TEST_EQUAL(mbedtls_ecdsa_verify(&grp, hash->x, hash->len, &Q, &r, &s_check), MBEDTLS_ERR_ECP_VERIFY_FAILED); TEST_EQUAL(mbedtls_ecdsa_verify(&grp, hash->x, hash->len, &Q, &r_check, &s), MBEDTLS_ERR_ECP_VERIFY_FAILED); TEST_EQUAL(mbedtls_ecdsa_verify(&grp, hash->x, hash->len, &Q, &r, &s), MBEDTLS_ERR_ECP_VERIFY_FAILED); /* Invalid signatures: r, s or both (CVE-2022-21449) are zero */ TEST_EQUAL(mbedtls_mpi_lset(&zero, 0), 0); TEST_EQUAL(mbedtls_ecdsa_verify(&grp, hash->x, hash->len, &Q, &zero, &s_check), MBEDTLS_ERR_ECP_VERIFY_FAILED); TEST_EQUAL(mbedtls_ecdsa_verify(&grp, hash->x, hash->len, &Q, &r_check, &zero), MBEDTLS_ERR_ECP_VERIFY_FAILED); TEST_EQUAL(mbedtls_ecdsa_verify(&grp, hash->x, hash->len, &Q, &zero, &zero), MBEDTLS_ERR_ECP_VERIFY_FAILED); /* Invalid signatures: r, s or both are == N */ TEST_EQUAL(mbedtls_ecdsa_verify(&grp, hash->x, hash->len, &Q, &grp.N, &s_check), MBEDTLS_ERR_ECP_VERIFY_FAILED); TEST_EQUAL(mbedtls_ecdsa_verify(&grp, hash->x, hash->len, &Q, &r_check, &grp.N), MBEDTLS_ERR_ECP_VERIFY_FAILED); TEST_EQUAL(mbedtls_ecdsa_verify(&grp, hash->x, hash->len, &Q, &grp.N, &grp.N), MBEDTLS_ERR_ECP_VERIFY_FAILED); /* Invalid signatures: r, s or both are negative */ TEST_EQUAL(mbedtls_mpi_sub_mpi(&r, &r_check, &grp.N), 0); TEST_EQUAL(mbedtls_mpi_sub_mpi(&s, &s_check, &grp.N), 0); TEST_EQUAL(mbedtls_ecdsa_verify(&grp, hash->x, hash->len, &Q, &r, &s_check), MBEDTLS_ERR_ECP_VERIFY_FAILED); TEST_EQUAL(mbedtls_ecdsa_verify(&grp, hash->x, hash->len, &Q, &r_check, &s), MBEDTLS_ERR_ECP_VERIFY_FAILED); TEST_EQUAL(mbedtls_ecdsa_verify(&grp, hash->x, hash->len, &Q, &r, &s), MBEDTLS_ERR_ECP_VERIFY_FAILED); /* Invalid signatures: r or s or both are > N */ TEST_EQUAL(mbedtls_mpi_add_mpi(&r, &r_check, &grp.N), 0); TEST_EQUAL(mbedtls_mpi_add_mpi(&s, &s_check, &grp.N), 0); TEST_EQUAL(mbedtls_ecdsa_verify(&grp, hash->x, hash->len, &Q, &r, &s_check), MBEDTLS_ERR_ECP_VERIFY_FAILED); TEST_EQUAL(mbedtls_ecdsa_verify(&grp, hash->x, hash->len, &Q, &r_check, &s), MBEDTLS_ERR_ECP_VERIFY_FAILED); TEST_EQUAL(mbedtls_ecdsa_verify(&grp, hash->x, hash->len, &Q, &r, &s), MBEDTLS_ERR_ECP_VERIFY_FAILED); } exit: mbedtls_ecp_group_free(&grp); mbedtls_ecp_point_free(&Q); mbedtls_mpi_free(&d); mbedtls_mpi_free(&r); mbedtls_mpi_free(&s); mbedtls_mpi_free(&r_check); mbedtls_mpi_free(&s_check); mbedtls_mpi_free(&zero); } /* END_CASE */ /* BEGIN_CASE depends_on:MBEDTLS_ECDSA_DETERMINISTIC */ void ecdsa_det_test_vectors(int id, char *d_str, int md_alg, char *msg, char *r_str, char *s_str) { mbedtls_ecp_group grp; mbedtls_mpi d, r, s, r_check, s_check; unsigned char hash[MBEDTLS_MD_MAX_SIZE]; size_t hlen; const mbedtls_md_info_t *md_info; mbedtls_ecp_group_init(&grp); mbedtls_mpi_init(&d); mbedtls_mpi_init(&r); mbedtls_mpi_init(&s); mbedtls_mpi_init(&r_check); mbedtls_mpi_init(&s_check); memset(hash, 0, sizeof(hash)); TEST_ASSERT(mbedtls_ecp_group_load(&grp, id) == 0); TEST_ASSERT(mbedtls_test_read_mpi(&d, d_str) == 0); TEST_ASSERT(mbedtls_test_read_mpi(&r_check, r_str) == 0); TEST_ASSERT(mbedtls_test_read_mpi(&s_check, s_str) == 0); md_info = mbedtls_md_info_from_type(md_alg); TEST_ASSERT(md_info != NULL); hlen = mbedtls_md_get_size(md_info); TEST_ASSERT(mbedtls_md(md_info, (const unsigned char *) msg, strlen(msg), hash) == 0); TEST_ASSERT( mbedtls_ecdsa_sign_det_ext(&grp, &r, &s, &d, hash, hlen, md_alg, mbedtls_test_rnd_std_rand, NULL) == 0); TEST_ASSERT(mbedtls_mpi_cmp_mpi(&r, &r_check) == 0); TEST_ASSERT(mbedtls_mpi_cmp_mpi(&s, &s_check) == 0); exit: mbedtls_ecp_group_free(&grp); mbedtls_mpi_free(&d); mbedtls_mpi_free(&r); mbedtls_mpi_free(&s); mbedtls_mpi_free(&r_check); mbedtls_mpi_free(&s_check); } /* END_CASE */ /* BEGIN_CASE depends_on:MBEDTLS_SHA256_C */ void ecdsa_write_read_zero(int id) { mbedtls_ecdsa_context ctx; mbedtls_test_rnd_pseudo_info rnd_info; unsigned char hash[32]; unsigned char sig[200]; size_t sig_len, i; mbedtls_ecdsa_init(&ctx); memset(&rnd_info, 0x00, sizeof(mbedtls_test_rnd_pseudo_info)); memset(hash, 0, sizeof(hash)); memset(sig, 0x2a, sizeof(sig)); /* generate signing key */ TEST_ASSERT(mbedtls_ecdsa_genkey(&ctx, id, &mbedtls_test_rnd_pseudo_rand, &rnd_info) == 0); /* generate and write signature, then read and verify it */ TEST_ASSERT(mbedtls_ecdsa_write_signature(&ctx, MBEDTLS_MD_SHA256, hash, sizeof(hash), sig, &sig_len, &mbedtls_test_rnd_pseudo_rand, &rnd_info) == 0); TEST_ASSERT(mbedtls_ecdsa_read_signature(&ctx, hash, sizeof(hash), sig, sig_len) == 0); /* check we didn't write past the announced length */ for (i = sig_len; i < sizeof(sig); i++) { TEST_ASSERT(sig[i] == 0x2a); } /* try verification with invalid length */ TEST_ASSERT(mbedtls_ecdsa_read_signature(&ctx, hash, sizeof(hash), sig, sig_len - 1) != 0); TEST_ASSERT(mbedtls_ecdsa_read_signature(&ctx, hash, sizeof(hash), sig, sig_len + 1) != 0); /* try invalid sequence tag */ sig[0]++; TEST_ASSERT(mbedtls_ecdsa_read_signature(&ctx, hash, sizeof(hash), sig, sig_len) != 0); sig[0]--; /* try modifying r */ sig[10]++; TEST_ASSERT(mbedtls_ecdsa_read_signature(&ctx, hash, sizeof(hash), sig, sig_len) == MBEDTLS_ERR_ECP_VERIFY_FAILED); sig[10]--; /* try modifying s */ sig[sig_len - 1]++; TEST_ASSERT(mbedtls_ecdsa_read_signature(&ctx, hash, sizeof(hash), sig, sig_len) == MBEDTLS_ERR_ECP_VERIFY_FAILED); sig[sig_len - 1]--; exit: mbedtls_ecdsa_free(&ctx); } /* END_CASE */ /* BEGIN_CASE depends_on:MBEDTLS_SHA256_C */ void ecdsa_write_read_random(int id) { mbedtls_ecdsa_context ctx; mbedtls_test_rnd_pseudo_info rnd_info; unsigned char hash[32]; unsigned char sig[200]; size_t sig_len, i; mbedtls_ecdsa_init(&ctx); memset(&rnd_info, 0x00, sizeof(mbedtls_test_rnd_pseudo_info)); memset(hash, 0, sizeof(hash)); memset(sig, 0x2a, sizeof(sig)); /* prepare material for signature */ TEST_ASSERT(mbedtls_test_rnd_pseudo_rand(&rnd_info, hash, sizeof(hash)) == 0); /* generate signing key */ TEST_ASSERT(mbedtls_ecdsa_genkey(&ctx, id, &mbedtls_test_rnd_pseudo_rand, &rnd_info) == 0); /* generate and write signature, then read and verify it */ TEST_ASSERT(mbedtls_ecdsa_write_signature(&ctx, MBEDTLS_MD_SHA256, hash, sizeof(hash), sig, &sig_len, &mbedtls_test_rnd_pseudo_rand, &rnd_info) == 0); TEST_ASSERT(mbedtls_ecdsa_read_signature(&ctx, hash, sizeof(hash), sig, sig_len) == 0); /* check we didn't write past the announced length */ for (i = sig_len; i < sizeof(sig); i++) { TEST_ASSERT(sig[i] == 0x2a); } /* try verification with invalid length */ TEST_ASSERT(mbedtls_ecdsa_read_signature(&ctx, hash, sizeof(hash), sig, sig_len - 1) != 0); TEST_ASSERT(mbedtls_ecdsa_read_signature(&ctx, hash, sizeof(hash), sig, sig_len + 1) != 0); /* try invalid sequence tag */ sig[0]++; TEST_ASSERT(mbedtls_ecdsa_read_signature(&ctx, hash, sizeof(hash), sig, sig_len) != 0); sig[0]--; /* try modifying r */ sig[10]++; TEST_ASSERT(mbedtls_ecdsa_read_signature(&ctx, hash, sizeof(hash), sig, sig_len) == MBEDTLS_ERR_ECP_VERIFY_FAILED); sig[10]--; /* try modifying s */ sig[sig_len - 1]++; TEST_ASSERT(mbedtls_ecdsa_read_signature(&ctx, hash, sizeof(hash), sig, sig_len) == MBEDTLS_ERR_ECP_VERIFY_FAILED); sig[sig_len - 1]--; exit: mbedtls_ecdsa_free(&ctx); } /* END_CASE */ /* BEGIN_CASE depends_on:MBEDTLS_ECP_RESTARTABLE */ void ecdsa_read_restart(int id, data_t *pk, data_t *hash, data_t *sig, int max_ops, int min_restart, int max_restart) { mbedtls_ecdsa_context ctx; mbedtls_ecdsa_restart_ctx rs_ctx; int ret, cnt_restart; mbedtls_ecdsa_init(&ctx); mbedtls_ecdsa_restart_init(&rs_ctx); TEST_ASSERT(mbedtls_ecp_group_load(&ctx.grp, id) == 0); TEST_ASSERT(mbedtls_ecp_point_read_binary(&ctx.grp, &ctx.Q, pk->x, pk->len) == 0); mbedtls_ecp_set_max_ops(max_ops); cnt_restart = 0; do { ret = mbedtls_ecdsa_read_signature_restartable(&ctx, hash->x, hash->len, sig->x, sig->len, &rs_ctx); } while (ret == MBEDTLS_ERR_ECP_IN_PROGRESS && ++cnt_restart); TEST_ASSERT(ret == 0); TEST_ASSERT(cnt_restart >= min_restart); TEST_ASSERT(cnt_restart <= max_restart); /* try modifying r */ TEST_ASSERT(sig->len > 10); sig->x[10]++; do { ret = mbedtls_ecdsa_read_signature_restartable(&ctx, hash->x, hash->len, sig->x, sig->len, &rs_ctx); } while (ret == MBEDTLS_ERR_ECP_IN_PROGRESS); TEST_ASSERT(ret == MBEDTLS_ERR_ECP_VERIFY_FAILED); sig->x[10]--; /* try modifying s */ sig->x[sig->len - 1]++; do { ret = mbedtls_ecdsa_read_signature_restartable(&ctx, hash->x, hash->len, sig->x, sig->len, &rs_ctx); } while (ret == MBEDTLS_ERR_ECP_IN_PROGRESS); TEST_ASSERT(ret == MBEDTLS_ERR_ECP_VERIFY_FAILED); sig->x[sig->len - 1]--; /* Do we leak memory when aborting an operation? * This test only makes sense when we actually restart */ if (min_restart > 0) { ret = mbedtls_ecdsa_read_signature_restartable(&ctx, hash->x, hash->len, sig->x, sig->len, &rs_ctx); TEST_ASSERT(ret == MBEDTLS_ERR_ECP_IN_PROGRESS); } exit: mbedtls_ecdsa_free(&ctx); mbedtls_ecdsa_restart_free(&rs_ctx); } /* END_CASE */ /* BEGIN_CASE depends_on:MBEDTLS_ECP_RESTARTABLE:MBEDTLS_ECDSA_DETERMINISTIC */ void ecdsa_write_restart(int id, char *d_str, int md_alg, char *msg, data_t *sig_check, int max_ops, int min_restart, int max_restart) { int ret, cnt_restart; mbedtls_ecdsa_restart_ctx rs_ctx; mbedtls_ecdsa_context ctx; unsigned char hash[MBEDTLS_MD_MAX_SIZE]; unsigned char sig[MBEDTLS_ECDSA_MAX_LEN]; size_t hlen, slen; const mbedtls_md_info_t *md_info; mbedtls_ecdsa_restart_init(&rs_ctx); mbedtls_ecdsa_init(&ctx); memset(hash, 0, sizeof(hash)); memset(sig, 0, sizeof(sig)); TEST_ASSERT(mbedtls_ecp_group_load(&ctx.grp, id) == 0); TEST_ASSERT(mbedtls_test_read_mpi(&ctx.d, d_str) == 0); md_info = mbedtls_md_info_from_type(md_alg); TEST_ASSERT(md_info != NULL); hlen = mbedtls_md_get_size(md_info); TEST_ASSERT(mbedtls_md(md_info, (const unsigned char *) msg, strlen(msg), hash) == 0); mbedtls_ecp_set_max_ops(max_ops); slen = sizeof(sig); cnt_restart = 0; do { ret = mbedtls_ecdsa_write_signature_restartable(&ctx, md_alg, hash, hlen, sig, &slen, NULL, NULL, &rs_ctx); } while (ret == MBEDTLS_ERR_ECP_IN_PROGRESS && ++cnt_restart); TEST_ASSERT(ret == 0); TEST_ASSERT(slen == sig_check->len); TEST_ASSERT(memcmp(sig, sig_check->x, slen) == 0); TEST_ASSERT(cnt_restart >= min_restart); TEST_ASSERT(cnt_restart <= max_restart); /* Do we leak memory when aborting an operation? * This test only makes sense when we actually restart */ if (min_restart > 0) { ret = mbedtls_ecdsa_write_signature_restartable(&ctx, md_alg, hash, hlen, sig, &slen, NULL, NULL, &rs_ctx); TEST_ASSERT(ret == MBEDTLS_ERR_ECP_IN_PROGRESS); } exit: mbedtls_ecdsa_restart_free(&rs_ctx); mbedtls_ecdsa_free(&ctx); } /* END_CASE */ /* BEGIN_CASE */ void ecdsa_verify(int grp_id, char *x, char *y, char *r, char *s, data_t *content, int expected) { mbedtls_ecdsa_context ctx; mbedtls_mpi sig_r, sig_s; mbedtls_ecdsa_init(&ctx); mbedtls_mpi_init(&sig_r); mbedtls_mpi_init(&sig_s); /* Prepare ECP group context */ TEST_EQUAL(mbedtls_ecp_group_load(&ctx.grp, grp_id), 0); /* Prepare public key */ TEST_EQUAL(mbedtls_test_read_mpi(&ctx.Q.X, x), 0); TEST_EQUAL(mbedtls_test_read_mpi(&ctx.Q.Y, y), 0); TEST_EQUAL(mbedtls_mpi_lset(&ctx.Q.Z, 1), 0); /* Prepare signature R & S */ TEST_EQUAL(mbedtls_test_read_mpi(&sig_r, r), 0); TEST_EQUAL(mbedtls_test_read_mpi(&sig_s, s), 0); /* Test whether public key has expected validity */ TEST_EQUAL(mbedtls_ecp_check_pubkey(&ctx.grp, &ctx.Q), expected == MBEDTLS_ERR_ECP_INVALID_KEY ? MBEDTLS_ERR_ECP_INVALID_KEY : 0); /* Verification */ int result = mbedtls_ecdsa_verify(&ctx.grp, content->x, content->len, &ctx.Q, &sig_r, &sig_s); TEST_EQUAL(result, expected); exit: mbedtls_ecdsa_free(&ctx); mbedtls_mpi_free(&sig_r); mbedtls_mpi_free(&sig_s); } /* END_CASE */