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/* ====================================================================
* Copyright (c) 1998-2005 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* openssl-core@OpenSSL.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*
* This product includes cryptographic software written by Eric Young
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com). */
#include <openssl/ecdsa.h>
#include <openssl/bio.h>
#include <openssl/bn.h>
#include <openssl/crypto.h>
#include <openssl/ec.h>
#include <openssl/err.h>
#include <openssl/mem.h>
#include <openssl/obj.h>
#include <openssl/rand.h>
int test_builtin(BIO *out) {
size_t n = 0;
EC_KEY *eckey = NULL, *wrong_eckey = NULL;
EC_GROUP *group;
BIGNUM *order = NULL;
ECDSA_SIG *ecdsa_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;
unsigned int sig_len, r_len, s_len, bn_len, buf_len;
int nid, ret = 0;
/* fill digest values with some random data */
if (!RAND_bytes(digest, 20) || !RAND_bytes(wrong_digest, 20)) {
BIO_printf(out, "ERROR: unable to get random data\n");
goto builtin_err;
}
order = BN_new();
if (order == NULL) {
goto builtin_err;
}
/* create and verify a ecdsa signature with every availble curve
* (with ) */
BIO_printf(out,
"\ntesting ECDSA_sign() and ECDSA_verify() "
"with some internal curves:\n");
static const int kCurveNIDs[] = {NID_secp224r1, NID_X9_62_prime256v1,
NID_secp384r1, NID_secp521r1, NID_undef};
/* now create and verify a signature for every curve */
for (n = 0; kCurveNIDs[n] != NID_undef; n++) {
unsigned char dirt, offset;
nid = kCurveNIDs[n];
/* create new ecdsa key (== EC_KEY) */
eckey = EC_KEY_new();
if (eckey == NULL) {
goto builtin_err;
}
group = EC_GROUP_new_by_curve_name(nid);
if (group == NULL) {
goto builtin_err;
}
if (!EC_KEY_set_group(eckey, group)) {
goto builtin_err;
}
EC_GROUP_free(group);
if (!EC_GROUP_get_order(EC_KEY_get0_group(eckey), order, NULL)) {
goto builtin_err;
}
if (BN_num_bits(order) < 160) {
/* Too small to test. */
EC_KEY_free(eckey);
eckey = NULL;
continue;
}
BIO_printf(out, "%s: ", OBJ_nid2sn(nid));
/* create key */
if (!EC_KEY_generate_key(eckey)) {
BIO_printf(out, " failed\n");
goto builtin_err;
}
/* create second key */
wrong_eckey = EC_KEY_new();
if (wrong_eckey == NULL) {
goto builtin_err;
}
group = EC_GROUP_new_by_curve_name(nid);
if (group == NULL) {
goto builtin_err;
}
if (EC_KEY_set_group(wrong_eckey, group) == 0) {
goto builtin_err;
}
EC_GROUP_free(group);
if (!EC_KEY_generate_key(wrong_eckey)) {
BIO_printf(out, " failed\n");
goto builtin_err;
}
BIO_printf(out, ".");
(void)BIO_flush(out);
/* check key */
if (!EC_KEY_check_key(eckey)) {
BIO_printf(out, " failed\n");
goto builtin_err;
}
BIO_printf(out, ".");
(void)BIO_flush(out);
/* create signature */
sig_len = ECDSA_size(eckey);
signature = OPENSSL_malloc(sig_len);
if (signature == NULL) {
goto builtin_err;
}
if (!ECDSA_sign(0, digest, 20, signature, &sig_len, eckey)) {
BIO_printf(out, " failed\n");
goto builtin_err;
}
BIO_printf(out, ".");
(void)BIO_flush(out);
/* verify signature */
if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) != 1) {
BIO_printf(out, " failed\n");
goto builtin_err;
}
BIO_printf(out, ".");
(void)BIO_flush(out);
/* verify signature with the wrong key */
if (ECDSA_verify(0, digest, 20, signature, sig_len, wrong_eckey) == 1) {
BIO_printf(out, " failed\n");
goto builtin_err;
}
BIO_printf(out, ".");
(void)BIO_flush(out);
/* wrong digest */
if (ECDSA_verify(0, wrong_digest, 20, signature, sig_len, eckey) == 1) {
BIO_printf(out, " failed\n");
goto builtin_err;
}
BIO_printf(out, ".");
(void)BIO_flush(out);
/* wrong length */
if (ECDSA_verify(0, digest, 20, signature, sig_len - 1, eckey) == 1) {
BIO_printf(out, " failed\n");
goto builtin_err;
}
BIO_printf(out, ".");
(void)BIO_flush(out);
/* 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;
ecdsa_sig = d2i_ECDSA_SIG(NULL, &sig_ptr, sig_len);
if (ecdsa_sig == NULL) {
BIO_printf(out, " failed\n");
goto builtin_err;
}
/* Store the two BIGNUMs in raw_buf. */
r_len = BN_num_bytes(ecdsa_sig->r);
s_len = BN_num_bytes(ecdsa_sig->s);
bn_len = BN_num_bytes(order);
if (r_len > bn_len || s_len > bn_len) {
BIO_printf(out, " failed\n");
goto builtin_err;
}
buf_len = 2 * bn_len;
raw_buf = OPENSSL_malloc(2 * bn_len);
if (raw_buf == NULL) {
goto builtin_err;
}
/* Pad the bignums with leading zeroes. */
if (!BN_bn2bin_padded(raw_buf, bn_len, ecdsa_sig->r) ||
!BN_bn2bin_padded(raw_buf + bn_len, bn_len, ecdsa_sig->s)) {
goto builtin_err;
}
/* 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 (BN_bin2bn(raw_buf, bn_len, ecdsa_sig->r) == NULL ||
BN_bin2bn(raw_buf + bn_len, bn_len, ecdsa_sig->s) == NULL) {
goto builtin_err;
}
sig_ptr2 = signature;
sig_len = i2d_ECDSA_SIG(ecdsa_sig, &sig_ptr2);
if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) == 1) {
BIO_printf(out, " failed\n");
goto builtin_err;
}
/* Sanity check: undo the modification and verify signature. */
raw_buf[offset] ^= dirt;
if (BN_bin2bn(raw_buf, bn_len, ecdsa_sig->r) == NULL ||
BN_bin2bn(raw_buf + bn_len, bn_len, ecdsa_sig->s) == NULL) {
goto builtin_err;
}
sig_ptr2 = signature;
sig_len = i2d_ECDSA_SIG(ecdsa_sig, &sig_ptr2);
if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) != 1) {
BIO_printf(out, " failed\n");
goto builtin_err;
}
BIO_printf(out, ".");
(void)BIO_flush(out);
BIO_printf(out, " ok\n");
/* cleanup */
/* clean bogus errors */
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;
OPENSSL_free(raw_buf);
raw_buf = NULL;
}
ret = 1;
builtin_err:
if (eckey) {
EC_KEY_free(eckey);
}
if (order) {
BN_free(order);
}
if (wrong_eckey) {
EC_KEY_free(wrong_eckey);
}
if (ecdsa_sig) {
ECDSA_SIG_free(ecdsa_sig);
}
if (signature) {
OPENSSL_free(signature);
}
if (raw_buf) {
OPENSSL_free(raw_buf);
}
return ret;
}
int main(void) {
int ret = 1;
BIO *out;
CRYPTO_library_init();
ERR_load_crypto_strings();
out = BIO_new_fp(stdout, BIO_NOCLOSE);
if (!test_builtin(out))
goto err;
ret = 0;
err:
if (ret)
BIO_printf(out, "\nECDSA test failed\n");
else
BIO_printf(out, "\nPASS\n");
if (ret)
BIO_print_errors(out);
if (out != NULL)
BIO_free(out);
return ret;
}