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dc352c1937
This includes support for: - comparisions between pairs of BIGNUMs - comparisions between BIGNUMs and zero - equality comparison between BIGNUMs and one - equality comparisons between BIGNUMs and constants - parity checks for BIGNUMs Reviewed-by: Rich Salz <rsalz@openssl.org> Reviewed-by: Richard Levitte <levitte@openssl.org> (Merged from https://github.com/openssl/openssl/pull/3405)
425 lines
14 KiB
C
425 lines
14 KiB
C
/*
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* Copyright 2002-2016 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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/* ====================================================================
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* Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
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*
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* Portions of the attached software ("Contribution") are developed by
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* SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
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*
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* The Contribution is licensed pursuant to the OpenSSL open source
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* license provided above.
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*
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* The elliptic curve binary polynomial software is originally written by
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* Sheueling Chang Shantz and Douglas Stebila of Sun Microsystems Laboratories.
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <openssl/opensslconf.h> /* To see if OPENSSL_NO_EC is defined */
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#ifdef OPENSSL_NO_EC
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int main(int argc, char *argv[])
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{
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puts("Elliptic curves are disabled.");
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return 0;
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}
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#else
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# include <openssl/crypto.h>
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# include <openssl/bio.h>
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# include <openssl/evp.h>
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# include <openssl/bn.h>
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# include <openssl/ec.h>
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# ifndef OPENSSL_NO_ENGINE
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# include <openssl/engine.h>
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# endif
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# include <openssl/err.h>
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# include <openssl/rand.h>
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# include "testutil.h"
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static const char rnd_seed[] = "string to make the random number generator "
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"think it has entropy";
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/* functions to change the RAND_METHOD */
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static int fbytes(unsigned char *buf, int num);
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static RAND_METHOD fake_rand;
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static const RAND_METHOD *old_rand;
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static int change_rand(void)
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{
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/* save old rand method */
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if (!TEST_ptr(old_rand = RAND_get_rand_method()))
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return 0;
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fake_rand = *old_rand;
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/* use own random function */
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fake_rand.bytes = fbytes;
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/* set new RAND_METHOD */
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if (!TEST_true(RAND_set_rand_method(&fake_rand)))
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return 0;
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return 1;
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}
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static int restore_rand(void)
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{
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if (!TEST_true(RAND_set_rand_method(old_rand)))
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return 0;
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return 1;
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}
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static int fbytes_counter = 0, use_fake = 0;
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static const char *numbers[8] = {
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"651056770906015076056810763456358567190100156695615665659",
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"6140507067065001063065065565667405560006161556565665656654",
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"8763001015071075675010661307616710783570106710677817767166"
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"71676178726717",
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"7000000175690566466555057817571571075705015757757057795755"
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"55657156756655",
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"1275552191113212300012030439187146164646146646466749494799",
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"1542725565216523985789236956265265265235675811949404040041",
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"1456427555219115346513212300075341203043918714616464614664"
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"64667494947990",
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"1712787255652165239672857892369562652652652356758119494040"
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"40041670216363"
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};
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static int fbytes(unsigned char *buf, int num)
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{
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int ret = 0;
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BIGNUM *tmp = NULL;
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if (use_fake == 0)
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return old_rand->bytes(buf, num);
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use_fake = 0;
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if (fbytes_counter >= 8)
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return 0;
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if (!TEST_ptr(tmp = BN_new()))
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return 0;
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if (!TEST_true(BN_dec2bn(&tmp, numbers[fbytes_counter]))) {
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BN_free(tmp);
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return 0;
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}
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fbytes_counter++;
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if (TEST_int_eq(BN_num_bytes(tmp), num)
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&& TEST_true(BN_bn2bin(tmp, buf)))
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ret = 1;
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BN_free(tmp);
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return ret;
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}
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/* some tests from the X9.62 draft */
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static int x9_62_test_internal(int nid, const char *r_in, const char *s_in)
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{
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int ret = 0;
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const char message[] = "abc";
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unsigned char digest[20];
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unsigned int dgst_len = 0;
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EVP_MD_CTX *md_ctx;
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EC_KEY *key = NULL;
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ECDSA_SIG *signature = NULL;
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BIGNUM *r = NULL, *s = NULL;
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BIGNUM *kinv = NULL, *rp = NULL;
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const BIGNUM *sig_r, *sig_s;
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if (!TEST_ptr(md_ctx = EVP_MD_CTX_new()))
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goto x962_int_err;
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/* get the message digest */
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if (!TEST_true(EVP_DigestInit(md_ctx, EVP_sha1()))
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|| !TEST_true(EVP_DigestUpdate(md_ctx, (const void *)message, 3))
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|| !TEST_true(EVP_DigestFinal(md_ctx, digest, &dgst_len)))
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goto x962_int_err;
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TEST_info("testing %s", OBJ_nid2sn(nid));
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/* create the key */
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if (!TEST_ptr(key = EC_KEY_new_by_curve_name(nid)))
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goto x962_int_err;
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use_fake = 1;
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if (!TEST_true(EC_KEY_generate_key(key)))
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goto x962_int_err;
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/* create the signature */
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use_fake = 1;
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/* Use ECDSA_sign_setup to avoid use of ECDSA nonces */
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if (!TEST_true(ECDSA_sign_setup(key, NULL, &kinv, &rp)))
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goto x962_int_err;
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if (!TEST_ptr(signature = ECDSA_do_sign_ex(digest, 20, kinv, rp, key)))
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goto x962_int_err;
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/* compare the created signature with the expected signature */
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if (!TEST_ptr(r = BN_new()) || !TEST_ptr(s = BN_new()))
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goto x962_int_err;
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if (!TEST_true(BN_dec2bn(&r, r_in)) || !TEST_true(BN_dec2bn(&s, s_in)))
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goto x962_int_err;
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ECDSA_SIG_get0(signature, &sig_r, &sig_s);
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if (!TEST_BN_eq(sig_r, r)
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|| !TEST_BN_eq(sig_s, s))
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goto x962_int_err;
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/* verify the signature */
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if (!TEST_int_eq(ECDSA_do_verify(digest, 20, signature, key), 1))
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goto x962_int_err;
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ret = 1;
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x962_int_err:
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EC_KEY_free(key);
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ECDSA_SIG_free(signature);
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BN_free(r);
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BN_free(s);
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EVP_MD_CTX_free(md_ctx);
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BN_clear_free(kinv);
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BN_clear_free(rp);
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return ret;
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}
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static int x9_62_tests()
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{
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int ret = 0;
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/* set own rand method */
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if (!change_rand())
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goto x962_err;
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if (!TEST_true(x9_62_test_internal(NID_X9_62_prime192v1,
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"3342403536405981729393488334694600415596881826869351677613",
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"5735822328888155254683894997897571951568553642892029982342")))
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goto x962_err;
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if (!TEST_true(x9_62_test_internal(NID_X9_62_prime239v1,
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"3086361431751678114926225473006680188549593787585317781474"
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"62058306432176",
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"3238135532097973577080787768312505059318910517550078427819"
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"78505179448783")))
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goto x962_err;
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# ifndef OPENSSL_NO_EC2M
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if (!TEST_true(x9_62_test_internal(NID_X9_62_c2tnb191v1,
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"87194383164871543355722284926904419997237591535066528048",
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"308992691965804947361541664549085895292153777025772063598")))
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goto x962_err;
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if (!TEST_true(x9_62_test_internal(NID_X9_62_c2tnb239v1,
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"2159633321041961198501834003903461262881815148684178964245"
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"5876922391552",
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"1970303740007316867383349976549972270528498040721988191026"
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"49413465737174")))
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goto x962_err;
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# endif
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ret = 1;
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x962_err:
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if (!TEST_true(restore_rand()))
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ret = 0;
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return ret;
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}
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static int test_builtin(void)
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{
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EC_builtin_curve *curves = NULL;
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size_t crv_len = 0, n = 0;
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EC_KEY *eckey = NULL, *wrong_eckey = NULL;
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EC_GROUP *group;
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ECDSA_SIG *ecdsa_sig = NULL, *modified_sig = NULL;
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unsigned char digest[20], wrong_digest[20];
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unsigned char *signature = NULL;
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const unsigned char *sig_ptr;
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unsigned char *sig_ptr2;
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unsigned char *raw_buf = NULL;
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const BIGNUM *sig_r, *sig_s;
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BIGNUM *modified_r = NULL, *modified_s = NULL;
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BIGNUM *unmodified_r = NULL, *unmodified_s = NULL;
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unsigned int sig_len, degree, r_len, s_len, bn_len, buf_len;
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int nid, ret = 0;
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/* fill digest values with some random data */
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if (!TEST_true(RAND_bytes(digest, 20))
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|| !TEST_true(RAND_bytes(wrong_digest, 20)))
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goto builtin_err;
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/* create and verify a ecdsa signature with every available curve */
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/* get a list of all internal curves */
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crv_len = EC_get_builtin_curves(NULL, 0);
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if (!TEST_ptr(curves = OPENSSL_malloc(sizeof(*curves) * crv_len))
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|| !TEST_true(EC_get_builtin_curves(curves, crv_len)))
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goto builtin_err;
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/* now create and verify a signature for every curve */
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for (n = 0; n < crv_len; n++) {
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unsigned char dirt, offset;
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nid = curves[n].nid;
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if (nid == NID_ipsec4 || nid == NID_X25519)
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continue;
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/* create new ecdsa key (== EC_KEY) */
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if (!TEST_ptr(eckey = EC_KEY_new())
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|| !TEST_ptr(group = EC_GROUP_new_by_curve_name(nid))
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|| !TEST_true(EC_KEY_set_group(eckey, group)))
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goto builtin_err;
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EC_GROUP_free(group);
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degree = EC_GROUP_get_degree(EC_KEY_get0_group(eckey));
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if (degree < 160) {
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/* drop the curve */
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EC_KEY_free(eckey);
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eckey = NULL;
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continue;
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}
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TEST_info("testing %s", OBJ_nid2sn(nid));
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/* create key */
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if (!TEST_true(EC_KEY_generate_key(eckey)))
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goto builtin_err;
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/* create second key */
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if (!TEST_ptr(wrong_eckey = EC_KEY_new())
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|| !TEST_ptr(group = EC_GROUP_new_by_curve_name(nid))
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|| !TEST_true(EC_KEY_set_group(wrong_eckey, group)))
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goto builtin_err;
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EC_GROUP_free(group);
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if (!TEST_true(EC_KEY_generate_key(wrong_eckey)))
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goto builtin_err;
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/* check key */
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if (!TEST_true(EC_KEY_check_key(eckey)))
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goto builtin_err;
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/* create signature */
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sig_len = ECDSA_size(eckey);
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if (!TEST_ptr(signature = OPENSSL_malloc(sig_len))
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|| !TEST_true(ECDSA_sign(0, digest, 20, signature, &sig_len,
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eckey)))
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goto builtin_err;
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/* verify signature */
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if (!TEST_int_eq(ECDSA_verify(0, digest, 20, signature, sig_len,
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eckey), 1))
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goto builtin_err;
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/* verify signature with the wrong key */
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if (!TEST_int_ne(ECDSA_verify(0, digest, 20, signature, sig_len,
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wrong_eckey), 1))
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goto builtin_err;
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/* wrong digest */
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if (!TEST_int_ne(ECDSA_verify(0, wrong_digest, 20, signature,
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sig_len, eckey), 1))
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goto builtin_err;
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/* wrong length */
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if (!TEST_int_ne(ECDSA_verify(0, digest, 20, signature,
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sig_len - 1, eckey), 1))
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goto builtin_err;
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/*
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* Modify a single byte of the signature: to ensure we don't garble
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* the ASN1 structure, we read the raw signature and modify a byte in
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* one of the bignums directly.
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*/
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sig_ptr = signature;
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if (!TEST_ptr(ecdsa_sig = d2i_ECDSA_SIG(NULL, &sig_ptr, sig_len)))
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goto builtin_err;
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ECDSA_SIG_get0(ecdsa_sig, &sig_r, &sig_s);
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/* Store the two BIGNUMs in raw_buf. */
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r_len = BN_num_bytes(sig_r);
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s_len = BN_num_bytes(sig_s);
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bn_len = (degree + 7) / 8;
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if (!TEST_false(r_len > bn_len)
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|| !TEST_false(s_len > bn_len))
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goto builtin_err;
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buf_len = 2 * bn_len;
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if (!TEST_ptr(raw_buf = OPENSSL_zalloc(buf_len)))
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goto builtin_err;
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BN_bn2bin(sig_r, raw_buf + bn_len - r_len);
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BN_bn2bin(sig_s, raw_buf + buf_len - s_len);
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/* Modify a single byte in the buffer. */
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offset = raw_buf[10] % buf_len;
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dirt = raw_buf[11] ? raw_buf[11] : 1;
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raw_buf[offset] ^= dirt;
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/* Now read the BIGNUMs back in from raw_buf. */
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if (!TEST_ptr(modified_sig = ECDSA_SIG_new()))
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goto builtin_err;
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if (!TEST_ptr(modified_r = BN_bin2bn(raw_buf, bn_len, NULL))
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|| !TEST_ptr(modified_s = BN_bin2bn(raw_buf + bn_len,
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bn_len, NULL))
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|| !TEST_true(ECDSA_SIG_set0(modified_sig,
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modified_r, modified_s))) {
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BN_free(modified_r);
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BN_free(modified_s);
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goto builtin_err;
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}
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sig_ptr2 = signature;
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sig_len = i2d_ECDSA_SIG(modified_sig, &sig_ptr2);
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if (!TEST_false(ECDSA_verify(0, digest, 20, signature, sig_len, eckey)))
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goto builtin_err;
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/* Sanity check: undo the modification and verify signature. */
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raw_buf[offset] ^= dirt;
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if (!TEST_ptr(unmodified_r = BN_bin2bn(raw_buf, bn_len, NULL))
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|| !TEST_ptr(unmodified_s = BN_bin2bn(raw_buf + bn_len,
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bn_len, NULL))
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|| !TEST_true(ECDSA_SIG_set0(modified_sig, unmodified_r,
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unmodified_s))) {
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BN_free(unmodified_r);
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BN_free(unmodified_s);
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goto builtin_err;
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}
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sig_ptr2 = signature;
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sig_len = i2d_ECDSA_SIG(modified_sig, &sig_ptr2);
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if (!TEST_true(ECDSA_verify(0, digest, 20, signature, sig_len, eckey)))
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goto builtin_err;
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/* cleanup */
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ERR_clear_error();
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OPENSSL_free(signature);
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signature = NULL;
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EC_KEY_free(eckey);
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eckey = NULL;
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EC_KEY_free(wrong_eckey);
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wrong_eckey = NULL;
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ECDSA_SIG_free(ecdsa_sig);
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ecdsa_sig = NULL;
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ECDSA_SIG_free(modified_sig);
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modified_sig = NULL;
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OPENSSL_free(raw_buf);
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raw_buf = NULL;
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}
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ret = 1;
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builtin_err:
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EC_KEY_free(eckey);
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EC_KEY_free(wrong_eckey);
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ECDSA_SIG_free(ecdsa_sig);
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ECDSA_SIG_free(modified_sig);
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OPENSSL_free(signature);
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OPENSSL_free(raw_buf);
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OPENSSL_free(curves);
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return ret;
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}
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void register_tests(void)
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{
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/* initialize the prng */
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RAND_seed(rnd_seed, sizeof(rnd_seed));
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ADD_TEST(x9_62_tests);
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ADD_TEST(test_builtin);
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}
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#endif
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