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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 <vector>
-
- #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>
-
- #include "../test/scoped_types.h"
- #include "../test/stl_compat.h"
-
- enum Api {
- kEncodedApi,
- kRawApi,
- };
-
- // VerifyECDSASig returns true on success, false on failure.
- static bool VerifyECDSASig(Api api, const uint8_t *digest,
- size_t digest_len, const ECDSA_SIG *ecdsa_sig,
- EC_KEY *eckey, int expected_result) {
- int actual_result;
-
- switch (api) {
- case kEncodedApi: {
- uint8_t *der;
- size_t der_len;
- if (!ECDSA_SIG_to_bytes(&der, &der_len, ecdsa_sig)) {
- return false;
- }
- ScopedOpenSSLBytes delete_der(der);
- actual_result = ECDSA_verify(0, digest, digest_len, der, der_len, eckey);
- break;
- }
-
- case kRawApi:
- actual_result = ECDSA_do_verify(digest, digest_len, ecdsa_sig, eckey);
- break;
-
- default:
- return false;
- }
- return expected_result == actual_result;
- }
-
- // TestTamperedSig verifies that signature verification fails when a valid
- // signature is tampered with. |ecdsa_sig| must be a valid signature, which will
- // be modified. TestTamperedSig returns true on success, false on failure.
- static bool TestTamperedSig(FILE *out, Api api, const uint8_t *digest,
- size_t digest_len, ECDSA_SIG *ecdsa_sig,
- EC_KEY *eckey, const BIGNUM *order) {
- // 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.
-
- // Store the two BIGNUMs in raw_buf.
- size_t r_len = BN_num_bytes(ecdsa_sig->r);
- size_t s_len = BN_num_bytes(ecdsa_sig->s);
- size_t bn_len = BN_num_bytes(order);
- if (r_len > bn_len || s_len > bn_len) {
- return false;
- }
- size_t buf_len = 2 * bn_len;
- std::vector<uint8_t> raw_buf(buf_len);
- // Pad the bignums with leading zeroes.
- if (!BN_bn2bin_padded(bssl::vector_data(&raw_buf), bn_len, ecdsa_sig->r) ||
- !BN_bn2bin_padded(bssl::vector_data(&raw_buf) + bn_len, bn_len,
- ecdsa_sig->s)) {
- return false;
- }
-
- // Modify a single byte in the buffer.
- size_t offset = raw_buf[10] % buf_len;
- uint8_t dirt = raw_buf[11] ? raw_buf[11] : 1;
- raw_buf[offset] ^= dirt;
- // Now read the BIGNUMs back in from raw_buf.
- if (BN_bin2bn(bssl::vector_data(&raw_buf), bn_len, ecdsa_sig->r) == NULL ||
- BN_bin2bn(bssl::vector_data(&raw_buf) + bn_len, bn_len,
- ecdsa_sig->s) == NULL ||
- !VerifyECDSASig(api, digest, digest_len, ecdsa_sig, eckey, 0)) {
- return false;
- }
-
- // Sanity check: Undo the modification and verify signature.
- raw_buf[offset] ^= dirt;
- if (BN_bin2bn(bssl::vector_data(&raw_buf), bn_len, ecdsa_sig->r) == NULL ||
- BN_bin2bn(bssl::vector_data(&raw_buf) + bn_len, bn_len,
- ecdsa_sig->s) == NULL ||
- !VerifyECDSASig(api, digest, digest_len, ecdsa_sig, eckey, 1)) {
- return false;
- }
-
- return true;
- }
-
- static bool TestBuiltin(FILE *out) {
- // Fill digest values with some random data.
- uint8_t digest[20], wrong_digest[20];
- if (!RAND_bytes(digest, 20) || !RAND_bytes(wrong_digest, 20)) {
- fprintf(out, "ERROR: unable to get random data\n");
- return false;
- }
-
- static const struct {
- int nid;
- const char *name;
- } kCurves[] = {
- { NID_secp224r1, "secp224r1" },
- { NID_X9_62_prime256v1, "secp256r1" },
- { NID_secp384r1, "secp384r1" },
- { NID_secp521r1, "secp521r1" },
- { NID_undef, NULL }
- };
-
- // Create and verify ECDSA signatures with every available curve.
- fputs("\ntesting ECDSA_sign(), ECDSA_verify(), ECDSA_do_sign(), and "
- "ECDSA_do_verify() with some internal curves:\n", out);
-
- for (size_t n = 0; kCurves[n].nid != NID_undef; n++) {
- fprintf(out, "%s: ", kCurves[n].name);
-
- int nid = kCurves[n].nid;
- ScopedEC_GROUP group(EC_GROUP_new_by_curve_name(nid));
- if (!group) {
- fprintf(out, " failed\n");
- return false;
- }
- ScopedBIGNUM order(BN_new());
- if (!order || !EC_GROUP_get_order(group.get(), order.get(), NULL)) {
- fprintf(out, " failed\n");
- return false;
- }
- if (BN_num_bits(order.get()) < 160) {
- // Too small to test.
- fprintf(out, " skipped\n");
- continue;
- }
-
- // Create a new ECDSA key.
- ScopedEC_KEY eckey(EC_KEY_new());
- if (!eckey || !EC_KEY_set_group(eckey.get(), group.get()) ||
- !EC_KEY_generate_key(eckey.get())) {
- fprintf(out, " failed\n");
- return false;
- }
- // Create a second key.
- ScopedEC_KEY wrong_eckey(EC_KEY_new());
- if (!wrong_eckey || !EC_KEY_set_group(wrong_eckey.get(), group.get()) ||
- !EC_KEY_generate_key(wrong_eckey.get())) {
- fprintf(out, " failed\n");
- return false;
- }
-
- fprintf(out, ".");
- fflush(out);
-
- // Check the key.
- if (!EC_KEY_check_key(eckey.get())) {
- fprintf(out, " failed\n");
- return false;
- }
- fprintf(out, ".");
- fflush(out);
-
- // Test ASN.1-encoded signatures.
- // Create a signature.
- unsigned sig_len = ECDSA_size(eckey.get());
- std::vector<uint8_t> signature(sig_len);
- if (!ECDSA_sign(0, digest, 20, bssl::vector_data(&signature), &sig_len,
- eckey.get())) {
- fprintf(out, " failed\n");
- return false;
- }
- signature.resize(sig_len);
- fprintf(out, ".");
- fflush(out);
- // Verify the signature.
- if (!ECDSA_verify(0, digest, 20, bssl::vector_data(&signature),
- signature.size(), eckey.get())) {
- fprintf(out, " failed\n");
- return false;
- }
- fprintf(out, ".");
- fflush(out);
- // Verify the signature with the wrong key.
- if (ECDSA_verify(0, digest, 20, bssl::vector_data(&signature),
- signature.size(), wrong_eckey.get())) {
- fprintf(out, " failed\n");
- return false;
- }
- fprintf(out, ".");
- fflush(out);
- // Verify the signature using the wrong digest.
- if (ECDSA_verify(0, wrong_digest, 20, bssl::vector_data(&signature),
- signature.size(), eckey.get())) {
- fprintf(out, " failed\n");
- return false;
- }
- fprintf(out, ".");
- fflush(out);
- // Verify a truncated signature.
- if (ECDSA_verify(0, digest, 20, bssl::vector_data(&signature),
- signature.size() - 1, eckey.get())) {
- fprintf(out, " failed\n");
- return false;
- }
- fprintf(out, ".");
- fflush(out);
- // Verify a tampered signature.
- ScopedECDSA_SIG ecdsa_sig(ECDSA_SIG_from_bytes(
- bssl::vector_data(&signature), signature.size()));
- if (!ecdsa_sig ||
- !TestTamperedSig(out, kEncodedApi, digest, 20, ecdsa_sig.get(),
- eckey.get(), order.get())) {
- fprintf(out, " failed\n");
- return false;
- }
- fprintf(out, ".");
- fflush(out);
-
- // Test ECDSA_SIG signing and verification.
- // Create a signature.
- ecdsa_sig.reset(ECDSA_do_sign(digest, 20, eckey.get()));
- if (!ecdsa_sig) {
- fprintf(out, " failed\n");
- return false;
- }
- fprintf(out, ".");
- fflush(out);
- // Verify the signature using the correct key.
- if (!ECDSA_do_verify(digest, 20, ecdsa_sig.get(), eckey.get())) {
- fprintf(out, " failed\n");
- return false;
- }
- fprintf(out, ".");
- fflush(out);
- // Verify the signature with the wrong key.
- if (ECDSA_do_verify(digest, 20, ecdsa_sig.get(), wrong_eckey.get())) {
- fprintf(out, " failed\n");
- return false;
- }
- fprintf(out, ".");
- fflush(out);
- // Verify the signature using the wrong digest.
- if (ECDSA_do_verify(wrong_digest, 20, ecdsa_sig.get(), eckey.get())) {
- fprintf(out, " failed\n");
- return false;
- }
- fprintf(out, ".");
- fflush(out);
- // Verify a tampered signature.
- if (!TestTamperedSig(out, kRawApi, digest, 20, ecdsa_sig.get(), eckey.get(),
- order.get())) {
- fprintf(out, " failed\n");
- return false;
- }
- fprintf(out, ".");
- fflush(out);
-
- fprintf(out, " ok\n");
- // Clear bogus errors.
- ERR_clear_error();
- }
-
- return true;
- }
-
- static bool TestECDSA_SIG_max_len(size_t order_len) {
- /* Create the largest possible |ECDSA_SIG| of the given constraints. */
- ScopedECDSA_SIG sig(ECDSA_SIG_new());
- if (!sig) {
- return false;
- }
- std::vector<uint8_t> bytes(order_len, 0xff);
- if (!BN_bin2bn(bssl::vector_data(&bytes), bytes.size(), sig->r) ||
- !BN_bin2bn(bssl::vector_data(&bytes), bytes.size(), sig->s)) {
- return false;
- }
- /* Serialize it. */
- uint8_t *der;
- size_t der_len;
- if (!ECDSA_SIG_to_bytes(&der, &der_len, sig.get())) {
- return false;
- }
- ScopedOpenSSLBytes delete_der(der);
-
- size_t max_len = ECDSA_SIG_max_len(order_len);
- if (max_len != der_len) {
- fprintf(stderr, "ECDSA_SIG_max_len(%u) returned %u, wanted %u\n",
- static_cast<unsigned>(order_len), static_cast<unsigned>(max_len),
- static_cast<unsigned>(der_len));
- return false;
- }
- return true;
- }
-
- int main(void) {
- CRYPTO_library_init();
- ERR_load_crypto_strings();
-
- if (!TestBuiltin(stdout) ||
- !TestECDSA_SIG_max_len(224/8) ||
- !TestECDSA_SIG_max_len(256/8) ||
- !TestECDSA_SIG_max_len(384/8) ||
- !TestECDSA_SIG_max_len(512/8) ||
- !TestECDSA_SIG_max_len(10000)) {
- printf("\nECDSA test failed\n");
- ERR_print_errors_fp(stdout);
- return 1;
- }
-
- printf("\nPASS\n");
- return 0;
- }
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