| /* |
| * Copyright 2002-2017 The OpenSSL Project Authors. All Rights Reserved. |
| * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved |
| * |
| * Licensed under the OpenSSL license (the "License"). You may not use |
| * this file except in compliance with the License. You can obtain a copy |
| * in the file LICENSE in the source distribution or at |
| * https://www.openssl.org/source/license.html |
| */ |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| |
| #include <openssl/opensslconf.h> /* To see if OPENSSL_NO_EC is defined */ |
| # include "testutil.h" |
| |
| #ifndef OPENSSL_NO_EC |
| |
| # include <openssl/crypto.h> |
| # include <openssl/bio.h> |
| # include <openssl/evp.h> |
| # include <openssl/bn.h> |
| # include <openssl/ec.h> |
| # ifndef OPENSSL_NO_ENGINE |
| # include <openssl/engine.h> |
| # endif |
| # include <openssl/err.h> |
| # include <openssl/rand.h> |
| |
| /* functions to change the RAND_METHOD */ |
| static int fbytes(unsigned char *buf, int num); |
| |
| static RAND_METHOD fake_rand; |
| static const RAND_METHOD *old_rand; |
| |
| static int change_rand(void) |
| { |
| /* save old rand method */ |
| if (!TEST_ptr(old_rand = RAND_get_rand_method())) |
| return 0; |
| |
| fake_rand = *old_rand; |
| /* use own random function */ |
| fake_rand.bytes = fbytes; |
| /* set new RAND_METHOD */ |
| if (!TEST_true(RAND_set_rand_method(&fake_rand))) |
| return 0; |
| return 1; |
| } |
| |
| static int restore_rand(void) |
| { |
| if (!TEST_true(RAND_set_rand_method(old_rand))) |
| return 0; |
| return 1; |
| } |
| |
| static int fbytes_counter = 0, use_fake = 0; |
| static const char *numbers[8] = { |
| "651056770906015076056810763456358567190100156695615665659", |
| "6140507067065001063065065565667405560006161556565665656654", |
| "8763001015071075675010661307616710783570106710677817767166" |
| "71676178726717", |
| "7000000175690566466555057817571571075705015757757057795755" |
| "55657156756655", |
| "1275552191113212300012030439187146164646146646466749494799", |
| "1542725565216523985789236956265265265235675811949404040041", |
| "1456427555219115346513212300075341203043918714616464614664" |
| "64667494947990", |
| "1712787255652165239672857892369562652652652356758119494040" |
| "40041670216363" |
| }; |
| |
| static int fbytes(unsigned char *buf, int num) |
| { |
| int ret = 0; |
| BIGNUM *tmp = NULL; |
| |
| if (use_fake == 0) |
| return old_rand->bytes(buf, num); |
| |
| use_fake = 0; |
| |
| if (fbytes_counter >= 8) |
| return 0; |
| if (!TEST_ptr(tmp = BN_new())) |
| return 0; |
| if (!TEST_true(BN_dec2bn(&tmp, numbers[fbytes_counter]))) { |
| BN_free(tmp); |
| return 0; |
| } |
| fbytes_counter++; |
| if (TEST_int_eq(BN_num_bytes(tmp), num) |
| && TEST_true(BN_bn2bin(tmp, buf))) |
| ret = 1; |
| BN_free(tmp); |
| return ret; |
| } |
| |
| /* some tests from the X9.62 draft */ |
| static int x9_62_test_internal(int nid, const char *r_in, const char *s_in) |
| { |
| int ret = 0; |
| const char message[] = "abc"; |
| unsigned char digest[20]; |
| unsigned int dgst_len = 0; |
| EVP_MD_CTX *md_ctx; |
| EC_KEY *key = NULL; |
| ECDSA_SIG *signature = NULL; |
| BIGNUM *r = NULL, *s = NULL; |
| BIGNUM *kinv = NULL, *rp = NULL; |
| const BIGNUM *sig_r, *sig_s; |
| |
| if (!TEST_ptr(md_ctx = EVP_MD_CTX_new())) |
| goto x962_int_err; |
| |
| /* get the message digest */ |
| if (!TEST_true(EVP_DigestInit(md_ctx, EVP_sha1())) |
| || !TEST_true(EVP_DigestUpdate(md_ctx, (const void *)message, 3)) |
| || !TEST_true(EVP_DigestFinal(md_ctx, digest, &dgst_len))) |
| goto x962_int_err; |
| |
| TEST_info("testing %s", OBJ_nid2sn(nid)); |
| |
| /* create the key */ |
| if (!TEST_ptr(key = EC_KEY_new_by_curve_name(nid))) |
| goto x962_int_err; |
| use_fake = 1; |
| if (!TEST_true(EC_KEY_generate_key(key))) |
| goto x962_int_err; |
| |
| /* create the signature */ |
| use_fake = 1; |
| /* Use ECDSA_sign_setup to avoid use of ECDSA nonces */ |
| if (!TEST_true(ECDSA_sign_setup(key, NULL, &kinv, &rp))) |
| goto x962_int_err; |
| if (!TEST_ptr(signature = ECDSA_do_sign_ex(digest, 20, kinv, rp, key))) |
| goto x962_int_err; |
| |
| /* compare the created signature with the expected signature */ |
| if (!TEST_ptr(r = BN_new()) || !TEST_ptr(s = BN_new())) |
| goto x962_int_err; |
| if (!TEST_true(BN_dec2bn(&r, r_in)) || !TEST_true(BN_dec2bn(&s, s_in))) |
| goto x962_int_err; |
| ECDSA_SIG_get0(signature, &sig_r, &sig_s); |
| if (!TEST_BN_eq(sig_r, r) |
| || !TEST_BN_eq(sig_s, s)) |
| goto x962_int_err; |
| |
| /* verify the signature */ |
| if (!TEST_int_eq(ECDSA_do_verify(digest, 20, signature, key), 1)) |
| goto x962_int_err; |
| |
| ret = 1; |
| |
| x962_int_err: |
| EC_KEY_free(key); |
| ECDSA_SIG_free(signature); |
| BN_free(r); |
| BN_free(s); |
| EVP_MD_CTX_free(md_ctx); |
| BN_clear_free(kinv); |
| BN_clear_free(rp); |
| return ret; |
| } |
| |
| static int x9_62_tests(void) |
| { |
| int ret = 0; |
| |
| /* set own rand method */ |
| if (!change_rand()) |
| goto x962_err; |
| |
| if (!TEST_true(x9_62_test_internal(NID_X9_62_prime192v1, |
| "3342403536405981729393488334694600415596881826869351677613", |
| "5735822328888155254683894997897571951568553642892029982342"))) |
| goto x962_err; |
| if (!TEST_true(x9_62_test_internal(NID_X9_62_prime239v1, |
| "3086361431751678114926225473006680188549593787585317781474" |
| "62058306432176", |
| "3238135532097973577080787768312505059318910517550078427819" |
| "78505179448783"))) |
| goto x962_err; |
| |
| # ifndef OPENSSL_NO_EC2M |
| if (!TEST_true(x9_62_test_internal(NID_X9_62_c2tnb191v1, |
| "87194383164871543355722284926904419997237591535066528048", |
| "308992691965804947361541664549085895292153777025772063598"))) |
| goto x962_err; |
| if (!TEST_true(x9_62_test_internal(NID_X9_62_c2tnb239v1, |
| "2159633321041961198501834003903461262881815148684178964245" |
| "5876922391552", |
| "1970303740007316867383349976549972270528498040721988191026" |
| "49413465737174"))) |
| goto x962_err; |
| # endif |
| ret = 1; |
| |
| x962_err: |
| if (!TEST_true(restore_rand())) |
| ret = 0; |
| return ret; |
| } |
| |
| static int test_builtin(void) |
| { |
| EC_builtin_curve *curves = NULL; |
| size_t crv_len = 0, n = 0; |
| EC_KEY *eckey = NULL, *wrong_eckey = NULL; |
| EC_GROUP *group; |
| ECDSA_SIG *ecdsa_sig = NULL, *modified_sig = NULL; |
| unsigned char digest[20], wrong_digest[20]; |
| unsigned char *signature = NULL; |
| const unsigned char *sig_ptr; |
| unsigned char *sig_ptr2; |
| unsigned char *raw_buf = NULL; |
| const BIGNUM *sig_r, *sig_s; |
| BIGNUM *modified_r = NULL, *modified_s = NULL; |
| BIGNUM *unmodified_r = NULL, *unmodified_s = NULL; |
| unsigned int sig_len, degree, r_len, s_len, bn_len, buf_len; |
| int nid, ret = 0; |
| |
| /* fill digest values with some random data */ |
| if (!TEST_true(RAND_bytes(digest, 20)) |
| || !TEST_true(RAND_bytes(wrong_digest, 20))) |
| goto builtin_err; |
| |
| /* create and verify a ecdsa signature with every available curve */ |
| /* get a list of all internal curves */ |
| crv_len = EC_get_builtin_curves(NULL, 0); |
| if (!TEST_ptr(curves = OPENSSL_malloc(sizeof(*curves) * crv_len)) |
| || !TEST_true(EC_get_builtin_curves(curves, crv_len))) |
| goto builtin_err; |
| |
| /* now create and verify a signature for every curve */ |
| for (n = 0; n < crv_len; n++) { |
| unsigned char dirt, offset; |
| |
| nid = curves[n].nid; |
| if (nid == NID_ipsec4 || nid == NID_X25519) |
| continue; |
| /* create new ecdsa key (== EC_KEY) */ |
| if (!TEST_ptr(eckey = EC_KEY_new()) |
| || !TEST_ptr(group = EC_GROUP_new_by_curve_name(nid)) |
| || !TEST_true(EC_KEY_set_group(eckey, group))) |
| goto builtin_err; |
| EC_GROUP_free(group); |
| degree = EC_GROUP_get_degree(EC_KEY_get0_group(eckey)); |
| if (degree < 160) { |
| /* drop the curve */ |
| EC_KEY_free(eckey); |
| eckey = NULL; |
| continue; |
| } |
| TEST_info("testing %s", OBJ_nid2sn(nid)); |
| |
| /* create key */ |
| if (!TEST_true(EC_KEY_generate_key(eckey))) |
| goto builtin_err; |
| /* create second key */ |
| if (!TEST_ptr(wrong_eckey = EC_KEY_new()) |
| || !TEST_ptr(group = EC_GROUP_new_by_curve_name(nid)) |
| || !TEST_true(EC_KEY_set_group(wrong_eckey, group))) |
| goto builtin_err; |
| EC_GROUP_free(group); |
| if (!TEST_true(EC_KEY_generate_key(wrong_eckey))) |
| goto builtin_err; |
| |
| /* check key */ |
| if (!TEST_true(EC_KEY_check_key(eckey))) |
| goto builtin_err; |
| |
| /* create signature */ |
| sig_len = ECDSA_size(eckey); |
| if (!TEST_ptr(signature = OPENSSL_malloc(sig_len)) |
| || !TEST_true(ECDSA_sign(0, digest, 20, signature, &sig_len, |
| eckey))) |
| goto builtin_err; |
| |
| /* verify signature */ |
| if (!TEST_int_eq(ECDSA_verify(0, digest, 20, signature, sig_len, |
| eckey), 1)) |
| goto builtin_err; |
| |
| /* verify signature with the wrong key */ |
| if (!TEST_int_ne(ECDSA_verify(0, digest, 20, signature, sig_len, |
| wrong_eckey), 1)) |
| goto builtin_err; |
| |
| /* wrong digest */ |
| if (!TEST_int_ne(ECDSA_verify(0, wrong_digest, 20, signature, |
| sig_len, eckey), 1)) |
| goto builtin_err; |
| |
| /* wrong length */ |
| if (!TEST_int_ne(ECDSA_verify(0, digest, 20, signature, |
| sig_len - 1, eckey), 1)) |
| goto builtin_err; |
| |
| /* |
| * Modify a single byte of the signature: to ensure we don't garble |
| * the ASN1 structure, we read the raw signature and modify a byte in |
| * one of the bignums directly. |
| */ |
| sig_ptr = signature; |
| if (!TEST_ptr(ecdsa_sig = d2i_ECDSA_SIG(NULL, &sig_ptr, sig_len))) |
| goto builtin_err; |
| |
| ECDSA_SIG_get0(ecdsa_sig, &sig_r, &sig_s); |
| |
| /* Store the two BIGNUMs in raw_buf. */ |
| r_len = BN_num_bytes(sig_r); |
| s_len = BN_num_bytes(sig_s); |
| bn_len = (degree + 7) / 8; |
| if (!TEST_false(r_len > bn_len) |
| || !TEST_false(s_len > bn_len)) |
| goto builtin_err; |
| buf_len = 2 * bn_len; |
| if (!TEST_ptr(raw_buf = OPENSSL_zalloc(buf_len))) |
| goto builtin_err; |
| BN_bn2bin(sig_r, raw_buf + bn_len - r_len); |
| BN_bn2bin(sig_s, raw_buf + buf_len - s_len); |
| |
| /* Modify a single byte in the buffer. */ |
| offset = raw_buf[10] % buf_len; |
| dirt = raw_buf[11] ? raw_buf[11] : 1; |
| raw_buf[offset] ^= dirt; |
| |
| /* Now read the BIGNUMs back in from raw_buf. */ |
| if (!TEST_ptr(modified_sig = ECDSA_SIG_new())) |
| goto builtin_err; |
| if (!TEST_ptr(modified_r = BN_bin2bn(raw_buf, bn_len, NULL)) |
| || !TEST_ptr(modified_s = BN_bin2bn(raw_buf + bn_len, |
| bn_len, NULL)) |
| || !TEST_true(ECDSA_SIG_set0(modified_sig, |
| modified_r, modified_s))) { |
| BN_free(modified_r); |
| BN_free(modified_s); |
| goto builtin_err; |
| } |
| sig_ptr2 = signature; |
| sig_len = i2d_ECDSA_SIG(modified_sig, &sig_ptr2); |
| if (!TEST_false(ECDSA_verify(0, digest, 20, signature, sig_len, eckey))) |
| goto builtin_err; |
| |
| /* Sanity check: undo the modification and verify signature. */ |
| raw_buf[offset] ^= dirt; |
| if (!TEST_ptr(unmodified_r = BN_bin2bn(raw_buf, bn_len, NULL)) |
| || !TEST_ptr(unmodified_s = BN_bin2bn(raw_buf + bn_len, |
| bn_len, NULL)) |
| || !TEST_true(ECDSA_SIG_set0(modified_sig, unmodified_r, |
| unmodified_s))) { |
| BN_free(unmodified_r); |
| BN_free(unmodified_s); |
| goto builtin_err; |
| } |
| |
| sig_ptr2 = signature; |
| sig_len = i2d_ECDSA_SIG(modified_sig, &sig_ptr2); |
| if (!TEST_true(ECDSA_verify(0, digest, 20, signature, sig_len, eckey))) |
| goto builtin_err; |
| |
| /* cleanup */ |
| ERR_clear_error(); |
| OPENSSL_free(signature); |
| signature = NULL; |
| EC_KEY_free(eckey); |
| eckey = NULL; |
| EC_KEY_free(wrong_eckey); |
| wrong_eckey = NULL; |
| ECDSA_SIG_free(ecdsa_sig); |
| ecdsa_sig = NULL; |
| ECDSA_SIG_free(modified_sig); |
| modified_sig = NULL; |
| OPENSSL_free(raw_buf); |
| raw_buf = NULL; |
| } |
| |
| ret = 1; |
| builtin_err: |
| EC_KEY_free(eckey); |
| EC_KEY_free(wrong_eckey); |
| ECDSA_SIG_free(ecdsa_sig); |
| ECDSA_SIG_free(modified_sig); |
| OPENSSL_free(signature); |
| OPENSSL_free(raw_buf); |
| OPENSSL_free(curves); |
| |
| return ret; |
| } |
| #endif |
| |
| int setup_tests(void) |
| { |
| #ifdef OPENSSL_NO_EC |
| TEST_note("Elliptic curves are disabled."); |
| #else |
| ADD_TEST(x9_62_tests); |
| ADD_TEST(test_builtin); |
| #endif |
| return 1; |
| } |
