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6025001707
Reviewed-by: Matt Caswell <matt@openssl.org> Reviewed-by: Rich Salz <rsalz@openssl.org> (Merged from https://github.com/openssl/openssl/pull/1413)
520 lines
16 KiB
C
520 lines
16 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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static const char rnd_seed[] = "string to make the random number generator "
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"think it has entropy";
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/* declaration of the test functions */
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int x9_62_tests(BIO *);
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int x9_62_test_internal(BIO *out, int nid, const char *r, const char *s);
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int test_builtin(BIO *);
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/* functions to change the RAND_METHOD */
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int change_rand(void);
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int restore_rand(void);
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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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int change_rand(void)
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{
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/* save old rand method */
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if ((old_rand = RAND_get_rand_method()) == NULL)
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return 0;
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fake_rand.seed = old_rand->seed;
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fake_rand.cleanup = old_rand->cleanup;
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fake_rand.add = old_rand->add;
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fake_rand.status = old_rand->status;
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/* use own random function */
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fake_rand.bytes = fbytes;
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fake_rand.pseudorand = old_rand->bytes;
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/* set new RAND_METHOD */
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if (!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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int restore_rand(void)
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{
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if (!RAND_set_rand_method(old_rand))
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return 0;
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else
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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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int fbytes(unsigned char *buf, int num)
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{
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int ret;
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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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tmp = BN_new();
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if (!tmp)
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return 0;
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if (!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 (num != BN_num_bytes(tmp) || !BN_bn2bin(tmp, buf))
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ret = 0;
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else
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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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int x9_62_test_internal(BIO *out, 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 = EVP_MD_CTX_new();
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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 (md_ctx == NULL)
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goto x962_int_err;
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/* get the message digest */
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if (!EVP_DigestInit(md_ctx, EVP_sha1())
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|| !EVP_DigestUpdate(md_ctx, (const void *)message, 3)
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|| !EVP_DigestFinal(md_ctx, digest, &dgst_len))
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goto x962_int_err;
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BIO_printf(out, "testing %s: ", OBJ_nid2sn(nid));
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/* create the key */
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if ((key = EC_KEY_new_by_curve_name(nid)) == NULL)
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goto x962_int_err;
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use_fake = 1;
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if (!EC_KEY_generate_key(key))
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goto x962_int_err;
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BIO_printf(out, ".");
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(void)BIO_flush(out);
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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 (!ECDSA_sign_setup(key, NULL, &kinv, &rp))
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goto x962_int_err;
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signature = ECDSA_do_sign_ex(digest, 20, kinv, rp, key);
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if (signature == NULL)
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goto x962_int_err;
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BIO_printf(out, ".");
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(void)BIO_flush(out);
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/* compare the created signature with the expected signature */
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if ((r = BN_new()) == NULL || (s = BN_new()) == NULL)
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goto x962_int_err;
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if (!BN_dec2bn(&r, r_in) || !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 (BN_cmp(sig_r, r) || BN_cmp(sig_s, s))
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goto x962_int_err;
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BIO_printf(out, ".");
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(void)BIO_flush(out);
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/* verify the signature */
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if (ECDSA_do_verify(digest, 20, signature, key) != 1)
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goto x962_int_err;
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BIO_printf(out, ".");
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(void)BIO_flush(out);
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BIO_printf(out, " ok\n");
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ret = 1;
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x962_int_err:
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if (!ret)
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BIO_printf(out, " failed\n");
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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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int x9_62_tests(BIO *out)
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{
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int ret = 0;
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BIO_printf(out, "some tests from X9.62:\n");
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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 (!x9_62_test_internal(out, 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 (!x9_62_test_internal(out, 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 (!x9_62_test_internal(out, 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 (!x9_62_test_internal(out, 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 (!restore_rand())
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ret = 0;
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return ret;
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}
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int test_builtin(BIO *out)
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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 (RAND_bytes(digest, 20) <= 0 || RAND_bytes(wrong_digest, 20) <= 0) {
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BIO_printf(out, "ERROR: unable to get random data\n");
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goto builtin_err;
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}
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/*
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* create and verify a ecdsa signature with every available curve (with )
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*/
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BIO_printf(out, "\ntesting ECDSA_sign() and ECDSA_verify() "
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"with some internal curves:\n");
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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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curves = OPENSSL_malloc(sizeof(*curves) * crv_len);
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if (curves == NULL) {
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BIO_printf(out, "malloc error\n");
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goto builtin_err;
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}
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if (!EC_get_builtin_curves(curves, crv_len)) {
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BIO_printf(out, "unable to get internal curves\n");
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goto builtin_err;
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}
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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 ((eckey = EC_KEY_new()) == NULL)
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goto builtin_err;
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group = EC_GROUP_new_by_curve_name(nid);
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if (group == NULL)
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goto builtin_err;
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if (EC_KEY_set_group(eckey, group) == 0)
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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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BIO_printf(out, "%s: ", OBJ_nid2sn(nid));
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/* create key */
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if (!EC_KEY_generate_key(eckey)) {
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BIO_printf(out, " failed\n");
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goto builtin_err;
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}
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/* create second key */
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if ((wrong_eckey = EC_KEY_new()) == NULL)
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goto builtin_err;
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group = EC_GROUP_new_by_curve_name(nid);
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if (group == NULL)
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goto builtin_err;
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if (EC_KEY_set_group(wrong_eckey, group) == 0)
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goto builtin_err;
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EC_GROUP_free(group);
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if (!EC_KEY_generate_key(wrong_eckey)) {
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BIO_printf(out, " failed\n");
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goto builtin_err;
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}
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BIO_printf(out, ".");
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(void)BIO_flush(out);
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/* check key */
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if (!EC_KEY_check_key(eckey)) {
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BIO_printf(out, " failed\n");
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goto builtin_err;
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}
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BIO_printf(out, ".");
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(void)BIO_flush(out);
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/* create signature */
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sig_len = ECDSA_size(eckey);
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if ((signature = OPENSSL_malloc(sig_len)) == NULL)
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goto builtin_err;
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if (!ECDSA_sign(0, digest, 20, signature, &sig_len, eckey)) {
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BIO_printf(out, " failed\n");
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goto builtin_err;
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}
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BIO_printf(out, ".");
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(void)BIO_flush(out);
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/* verify signature */
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if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) != 1) {
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BIO_printf(out, " failed\n");
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goto builtin_err;
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}
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BIO_printf(out, ".");
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(void)BIO_flush(out);
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/* verify signature with the wrong key */
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if (ECDSA_verify(0, digest, 20, signature, sig_len, wrong_eckey) == 1) {
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BIO_printf(out, " failed\n");
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goto builtin_err;
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}
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BIO_printf(out, ".");
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(void)BIO_flush(out);
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/* wrong digest */
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if (ECDSA_verify(0, wrong_digest, 20, signature, sig_len, eckey) == 1) {
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BIO_printf(out, " failed\n");
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goto builtin_err;
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}
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BIO_printf(out, ".");
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(void)BIO_flush(out);
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/* wrong length */
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if (ECDSA_verify(0, digest, 20, signature, sig_len - 1, eckey) == 1) {
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BIO_printf(out, " failed\n");
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goto builtin_err;
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}
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BIO_printf(out, ".");
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(void)BIO_flush(out);
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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 ((ecdsa_sig = d2i_ECDSA_SIG(NULL, &sig_ptr, sig_len)) == NULL) {
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BIO_printf(out, " failed\n");
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goto builtin_err;
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}
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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 ((r_len > bn_len) || (s_len > bn_len)) {
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BIO_printf(out, " failed\n");
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goto builtin_err;
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}
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buf_len = 2 * bn_len;
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if ((raw_buf = OPENSSL_zalloc(buf_len)) == NULL)
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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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modified_sig = ECDSA_SIG_new();
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if (modified_sig == NULL)
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goto builtin_err;
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if (((modified_r = BN_bin2bn(raw_buf, bn_len, NULL)) == NULL)
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|| ((modified_s = BN_bin2bn(raw_buf + bn_len, bn_len, NULL)) == NULL)
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|| !ECDSA_SIG_set0(modified_sig, 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 (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) == 1) {
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BIO_printf(out, " failed\n");
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goto builtin_err;
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}
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/*
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* Sanity check: undo the modification and verify signature.
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*/
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raw_buf[offset] ^= dirt;
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if (((unmodified_r = BN_bin2bn(raw_buf, bn_len, NULL)) == NULL)
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|| ((unmodified_s = BN_bin2bn(raw_buf + bn_len, bn_len, NULL)) == NULL)
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|| !ECDSA_SIG_set0(modified_sig, unmodified_r, 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 (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) != 1) {
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BIO_printf(out, " failed\n");
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goto builtin_err;
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}
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BIO_printf(out, ".");
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(void)BIO_flush(out);
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BIO_printf(out, " ok\n");
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/* cleanup */
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/* clean bogus errors */
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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;
|
|
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;
|
|
}
|
|
|
|
int main(void)
|
|
{
|
|
int ret = 1;
|
|
BIO *out;
|
|
char *p;
|
|
|
|
out = BIO_new_fp(stdout, BIO_NOCLOSE | BIO_FP_TEXT);
|
|
|
|
p = getenv("OPENSSL_DEBUG_MEMORY");
|
|
if (p != NULL && strcmp(p, "on") == 0)
|
|
CRYPTO_set_mem_debug(1);
|
|
|
|
/* initialize the prng */
|
|
RAND_seed(rnd_seed, sizeof(rnd_seed));
|
|
|
|
/* the tests */
|
|
if (!x9_62_tests(out))
|
|
goto err;
|
|
if (!test_builtin(out))
|
|
goto err;
|
|
|
|
ret = 0;
|
|
err:
|
|
if (ret)
|
|
BIO_printf(out, "\nECDSA test failed\n");
|
|
else
|
|
BIO_printf(out, "\nECDSA test passed\n");
|
|
if (ret)
|
|
ERR_print_errors(out);
|
|
|
|
#ifndef OPENSSL_NO_CRYPTO_MDEBUG
|
|
if (CRYPTO_mem_leaks(out) <= 0)
|
|
ret = 1;
|
|
#endif
|
|
BIO_free(out);
|
|
return ret;
|
|
}
|
|
#endif
|