458 lines
16 KiB
C++
458 lines
16 KiB
C++
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/* ====================================================================
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* Copyright (c) 1998-2005 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* openssl-core@OpenSSL.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com). */
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#include <openssl/ecdsa.h>
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#include <vector>
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#include <gtest/gtest.h>
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#include <openssl/bn.h>
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#include <openssl/crypto.h>
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#include <openssl/ec.h>
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#include <openssl/err.h>
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#include <openssl/mem.h>
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#include <openssl/nid.h>
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#include <openssl/rand.h>
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#include "../ec/internal.h"
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#include "../../test/file_test.h"
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static bssl::UniquePtr<BIGNUM> HexToBIGNUM(const char *hex) {
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BIGNUM *bn = nullptr;
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BN_hex2bn(&bn, hex);
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return bssl::UniquePtr<BIGNUM>(bn);
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}
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// Though we do not support secp160r1, it is reachable from the deprecated
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// custom curve APIs and has some unique properties (n is larger than p with the
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// difference crossing a word boundary on 32-bit), so test it explicitly.
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static bssl::UniquePtr<EC_GROUP> NewSecp160r1Group() {
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static const char kP[] = "ffffffffffffffffffffffffffffffff7fffffff";
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static const char kA[] = "ffffffffffffffffffffffffffffffff7ffffffc";
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static const char kB[] = "1c97befc54bd7a8b65acf89f81d4d4adc565fa45";
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static const char kX[] = "4a96b5688ef573284664698968c38bb913cbfc82";
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static const char kY[] = "23a628553168947d59dcc912042351377ac5fb32";
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static const char kN[] = "0100000000000000000001f4c8f927aed3ca752257";
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bssl::UniquePtr<BIGNUM> p = HexToBIGNUM(kP), a = HexToBIGNUM(kA),
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b = HexToBIGNUM(kB), x = HexToBIGNUM(kX),
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y = HexToBIGNUM(kY), n = HexToBIGNUM(kN);
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if (!p || !a || !b || !x || !y || !n) {
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return nullptr;
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}
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bssl::UniquePtr<EC_GROUP> group(
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EC_GROUP_new_curve_GFp(p.get(), a.get(), b.get(), nullptr));
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if (!group) {
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return nullptr;
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}
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bssl::UniquePtr<EC_POINT> g(EC_POINT_new(group.get()));
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if (!g ||
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!EC_POINT_set_affine_coordinates_GFp(group.get(), g.get(), x.get(),
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y.get(), nullptr) ||
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!EC_GROUP_set_generator(group.get(), g.get(), n.get(), BN_value_one())) {
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return nullptr;
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}
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return group;
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}
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enum API {
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kEncodedAPI,
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kRawAPI,
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};
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// VerifyECDSASig checks that verifying |ecdsa_sig| gives |expected_result|.
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static void VerifyECDSASig(API api, const uint8_t *digest, size_t digest_len,
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const ECDSA_SIG *ecdsa_sig, EC_KEY *eckey,
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int expected_result) {
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switch (api) {
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case kEncodedAPI: {
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uint8_t *der;
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size_t der_len;
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ASSERT_TRUE(ECDSA_SIG_to_bytes(&der, &der_len, ecdsa_sig));
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bssl::UniquePtr<uint8_t> delete_der(der);
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EXPECT_EQ(expected_result,
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ECDSA_verify(0, digest, digest_len, der, der_len, eckey));
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break;
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}
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case kRawAPI:
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EXPECT_EQ(expected_result,
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ECDSA_do_verify(digest, digest_len, ecdsa_sig, eckey));
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break;
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default:
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FAIL() << "Unknown API type.";
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}
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}
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// TestTamperedSig verifies that signature verification fails when a valid
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// signature is tampered with. |ecdsa_sig| must be a valid signature, which will
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// be modified.
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static void TestTamperedSig(API api, const uint8_t *digest,
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size_t digest_len, ECDSA_SIG *ecdsa_sig,
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EC_KEY *eckey, const BIGNUM *order) {
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SCOPED_TRACE(api);
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// Modify a single byte of the signature: to ensure we don't
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// garble the ASN1 structure, we read the raw signature and
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// modify a byte in one of the bignums directly.
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// Store the two BIGNUMs in raw_buf.
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size_t r_len = BN_num_bytes(ecdsa_sig->r);
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size_t s_len = BN_num_bytes(ecdsa_sig->s);
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size_t bn_len = BN_num_bytes(order);
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ASSERT_LE(r_len, bn_len);
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ASSERT_LE(s_len, bn_len);
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size_t buf_len = 2 * bn_len;
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std::vector<uint8_t> raw_buf(buf_len);
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// Pad the bignums with leading zeroes.
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ASSERT_TRUE(BN_bn2bin_padded(raw_buf.data(), bn_len, ecdsa_sig->r));
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ASSERT_TRUE(BN_bn2bin_padded(raw_buf.data() + bn_len, bn_len, ecdsa_sig->s));
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// Modify a single byte in the buffer.
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size_t offset = raw_buf[10] % buf_len;
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uint8_t 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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ASSERT_TRUE(BN_bin2bn(raw_buf.data(), bn_len, ecdsa_sig->r));
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ASSERT_TRUE(BN_bin2bn(raw_buf.data() + bn_len, bn_len, ecdsa_sig->s));
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VerifyECDSASig(api, digest, digest_len, ecdsa_sig, eckey, 0);
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// Sanity check: Undo the modification and verify signature.
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raw_buf[offset] ^= dirt;
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ASSERT_TRUE(BN_bin2bn(raw_buf.data(), bn_len, ecdsa_sig->r));
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ASSERT_TRUE(BN_bin2bn(raw_buf.data() + bn_len, bn_len, ecdsa_sig->s));
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VerifyECDSASig(api, digest, digest_len, ecdsa_sig, eckey, 1);
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}
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TEST(ECDSATest, BuiltinCurves) {
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// Fill digest values with some random data.
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uint8_t digest[20], wrong_digest[20];
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ASSERT_TRUE(RAND_bytes(digest, 20));
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ASSERT_TRUE(RAND_bytes(wrong_digest, 20));
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static const struct {
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int nid;
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const char *name;
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} kCurves[] = {
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{ NID_secp224r1, "secp224r1" },
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{ NID_X9_62_prime256v1, "secp256r1" },
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{ NID_secp384r1, "secp384r1" },
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{ NID_secp521r1, "secp521r1" },
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{ NID_secp160r1, "secp160r1" },
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};
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for (const auto &curve : kCurves) {
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SCOPED_TRACE(curve.name);
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bssl::UniquePtr<EC_GROUP> group;
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if (curve.nid == NID_secp160r1) {
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group = NewSecp160r1Group();
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} else {
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group.reset(EC_GROUP_new_by_curve_name(curve.nid));
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}
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ASSERT_TRUE(group);
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const BIGNUM *order = EC_GROUP_get0_order(group.get());
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// Create a new ECDSA key.
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bssl::UniquePtr<EC_KEY> eckey(EC_KEY_new());
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ASSERT_TRUE(eckey);
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ASSERT_TRUE(EC_KEY_set_group(eckey.get(), group.get()));
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ASSERT_TRUE(EC_KEY_generate_key(eckey.get()));
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// Create a second key.
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bssl::UniquePtr<EC_KEY> wrong_eckey(EC_KEY_new());
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ASSERT_TRUE(wrong_eckey);
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ASSERT_TRUE(EC_KEY_set_group(wrong_eckey.get(), group.get()));
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ASSERT_TRUE(EC_KEY_generate_key(wrong_eckey.get()));
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// Check the key.
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EXPECT_TRUE(EC_KEY_check_key(eckey.get()));
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// Test ASN.1-encoded signatures.
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// Create a signature.
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unsigned sig_len = ECDSA_size(eckey.get());
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std::vector<uint8_t> signature(sig_len);
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ASSERT_TRUE(
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ECDSA_sign(0, digest, 20, signature.data(), &sig_len, eckey.get()));
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signature.resize(sig_len);
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// Verify the signature.
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EXPECT_TRUE(ECDSA_verify(0, digest, 20, signature.data(), signature.size(),
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eckey.get()));
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// Verify the signature with the wrong key.
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EXPECT_FALSE(ECDSA_verify(0, digest, 20, signature.data(), signature.size(),
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wrong_eckey.get()));
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ERR_clear_error();
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// Verify the signature using the wrong digest.
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EXPECT_FALSE(ECDSA_verify(0, wrong_digest, 20, signature.data(),
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signature.size(), eckey.get()));
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ERR_clear_error();
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// Verify a truncated signature.
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EXPECT_FALSE(ECDSA_verify(0, digest, 20, signature.data(),
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signature.size() - 1, eckey.get()));
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ERR_clear_error();
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// Verify a tampered signature.
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bssl::UniquePtr<ECDSA_SIG> ecdsa_sig(
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ECDSA_SIG_from_bytes(signature.data(), signature.size()));
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ASSERT_TRUE(ecdsa_sig);
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TestTamperedSig(kEncodedAPI, digest, 20, ecdsa_sig.get(), eckey.get(),
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order);
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// Test ECDSA_SIG signing and verification.
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// Create a signature.
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ecdsa_sig.reset(ECDSA_do_sign(digest, 20, eckey.get()));
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ASSERT_TRUE(ecdsa_sig);
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// Verify the signature using the correct key.
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EXPECT_TRUE(ECDSA_do_verify(digest, 20, ecdsa_sig.get(), eckey.get()));
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// Verify the signature with the wrong key.
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EXPECT_FALSE(
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ECDSA_do_verify(digest, 20, ecdsa_sig.get(), wrong_eckey.get()));
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ERR_clear_error();
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// Verify the signature using the wrong digest.
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EXPECT_FALSE(
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ECDSA_do_verify(wrong_digest, 20, ecdsa_sig.get(), eckey.get()));
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ERR_clear_error();
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// Verify a tampered signature.
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TestTamperedSig(kRawAPI, digest, 20, ecdsa_sig.get(), eckey.get(), order);
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}
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}
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static size_t BitsToBytes(size_t bits) {
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return (bits / 8) + (7 + (bits % 8)) / 8;
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}
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TEST(ECDSATest, MaxSigLen) {
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static const size_t kBits[] = {224, 256, 384, 521, 10000};
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for (size_t bits : kBits) {
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SCOPED_TRACE(bits);
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size_t order_len = BitsToBytes(bits);
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// Create the largest possible |ECDSA_SIG| of the given constraints.
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bssl::UniquePtr<ECDSA_SIG> sig(ECDSA_SIG_new());
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ASSERT_TRUE(sig);
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std::vector<uint8_t> bytes(order_len, 0xff);
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ASSERT_TRUE(BN_bin2bn(bytes.data(), bytes.size(), sig->r));
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ASSERT_TRUE(BN_bin2bn(bytes.data(), bytes.size(), sig->s));
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// Serialize it.
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uint8_t *der;
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size_t der_len;
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ASSERT_TRUE(ECDSA_SIG_to_bytes(&der, &der_len, sig.get()));
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OPENSSL_free(der);
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EXPECT_EQ(der_len, ECDSA_SIG_max_len(order_len));
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}
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}
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static bssl::UniquePtr<EC_GROUP> GetCurve(FileTest *t, const char *key) {
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std::string curve_name;
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if (!t->GetAttribute(&curve_name, key)) {
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return nullptr;
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}
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if (curve_name == "P-224") {
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return bssl::UniquePtr<EC_GROUP>(EC_GROUP_new_by_curve_name(NID_secp224r1));
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}
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if (curve_name == "P-256") {
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return bssl::UniquePtr<EC_GROUP>(
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EC_GROUP_new_by_curve_name(NID_X9_62_prime256v1));
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}
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if (curve_name == "P-384") {
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return bssl::UniquePtr<EC_GROUP>(EC_GROUP_new_by_curve_name(NID_secp384r1));
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}
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if (curve_name == "P-521") {
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return bssl::UniquePtr<EC_GROUP>(EC_GROUP_new_by_curve_name(NID_secp521r1));
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}
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if (curve_name == "secp160r1") {
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return NewSecp160r1Group();
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}
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ADD_FAILURE() << "Unknown curve: " << curve_name;
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return nullptr;
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}
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|
|
|
||
|
|
static bssl::UniquePtr<EC_GROUP> MakeCustomClone(const EC_GROUP *group) {
|
||
|
|
bssl::UniquePtr<BN_CTX> ctx(BN_CTX_new());
|
||
|
|
bssl::UniquePtr<BIGNUM> p(BN_new()), a(BN_new()), b(BN_new()), x(BN_new()),
|
||
|
|
y(BN_new());
|
||
|
|
if (!ctx || !p || !a || !b || !x || !y ||
|
||
|
|
!EC_GROUP_get_curve_GFp(group, p.get(), a.get(), b.get(), ctx.get()) ||
|
||
|
|
!EC_POINT_get_affine_coordinates_GFp(
|
||
|
|
group, EC_GROUP_get0_generator(group), x.get(), y.get(), ctx.get())) {
|
||
|
|
return nullptr;
|
||
|
|
}
|
||
|
|
bssl::UniquePtr<EC_GROUP> ret(
|
||
|
|
EC_GROUP_new_curve_GFp(p.get(), a.get(), b.get(), ctx.get()));
|
||
|
|
if (!ret) {
|
||
|
|
return nullptr;
|
||
|
|
}
|
||
|
|
bssl::UniquePtr<EC_POINT> g(EC_POINT_new(ret.get()));
|
||
|
|
if (!g ||
|
||
|
|
!EC_POINT_set_affine_coordinates_GFp(ret.get(), g.get(), x.get(), y.get(),
|
||
|
|
ctx.get()) ||
|
||
|
|
!EC_GROUP_set_generator(ret.get(), g.get(), EC_GROUP_get0_order(group),
|
||
|
|
BN_value_one())) {
|
||
|
|
return nullptr;
|
||
|
|
}
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static bssl::UniquePtr<BIGNUM> GetBIGNUM(FileTest *t, const char *key) {
|
||
|
|
std::vector<uint8_t> bytes;
|
||
|
|
if (!t->GetBytes(&bytes, key)) {
|
||
|
|
return nullptr;
|
||
|
|
}
|
||
|
|
|
||
|
|
return bssl::UniquePtr<BIGNUM>(BN_bin2bn(bytes.data(), bytes.size(), nullptr));
|
||
|
|
}
|
||
|
|
|
||
|
|
TEST(ECDSATest, VerifyTestVectors) {
|
||
|
|
FileTestGTest("crypto/fipsmodule/ecdsa/ecdsa_verify_tests.txt",
|
||
|
|
[](FileTest *t) {
|
||
|
|
for (bool custom_group : {false, true}) {
|
||
|
|
SCOPED_TRACE(custom_group);
|
||
|
|
bssl::UniquePtr<EC_GROUP> group = GetCurve(t, "Curve");
|
||
|
|
ASSERT_TRUE(group);
|
||
|
|
if (custom_group) {
|
||
|
|
group = MakeCustomClone(group.get());
|
||
|
|
ASSERT_TRUE(group);
|
||
|
|
}
|
||
|
|
bssl::UniquePtr<BIGNUM> x = GetBIGNUM(t, "X");
|
||
|
|
ASSERT_TRUE(x);
|
||
|
|
bssl::UniquePtr<BIGNUM> y = GetBIGNUM(t, "Y");
|
||
|
|
ASSERT_TRUE(y);
|
||
|
|
bssl::UniquePtr<BIGNUM> r = GetBIGNUM(t, "R");
|
||
|
|
ASSERT_TRUE(r);
|
||
|
|
bssl::UniquePtr<BIGNUM> s = GetBIGNUM(t, "S");
|
||
|
|
ASSERT_TRUE(s);
|
||
|
|
std::vector<uint8_t> digest;
|
||
|
|
ASSERT_TRUE(t->GetBytes(&digest, "Digest"));
|
||
|
|
|
||
|
|
bssl::UniquePtr<EC_KEY> key(EC_KEY_new());
|
||
|
|
ASSERT_TRUE(key);
|
||
|
|
bssl::UniquePtr<EC_POINT> pub_key(EC_POINT_new(group.get()));
|
||
|
|
ASSERT_TRUE(pub_key);
|
||
|
|
bssl::UniquePtr<ECDSA_SIG> sig(ECDSA_SIG_new());
|
||
|
|
ASSERT_TRUE(sig);
|
||
|
|
ASSERT_TRUE(EC_KEY_set_group(key.get(), group.get()));
|
||
|
|
ASSERT_TRUE(EC_POINT_set_affine_coordinates_GFp(
|
||
|
|
group.get(), pub_key.get(), x.get(), y.get(), nullptr));
|
||
|
|
ASSERT_TRUE(EC_KEY_set_public_key(key.get(), pub_key.get()));
|
||
|
|
ASSERT_TRUE(BN_copy(sig->r, r.get()));
|
||
|
|
ASSERT_TRUE(BN_copy(sig->s, s.get()));
|
||
|
|
|
||
|
|
EXPECT_EQ(
|
||
|
|
t->HasAttribute("Invalid") ? 0 : 1,
|
||
|
|
ECDSA_do_verify(digest.data(), digest.size(), sig.get(), key.get()));
|
||
|
|
}
|
||
|
|
});
|
||
|
|
}
|
||
|
|
|
||
|
|
TEST(ECDSATest, SignTestVectors) {
|
||
|
|
FileTestGTest("crypto/fipsmodule/ecdsa/ecdsa_sign_tests.txt",
|
||
|
|
[](FileTest *t) {
|
||
|
|
for (bool custom_group : {false, true}) {
|
||
|
|
SCOPED_TRACE(custom_group);
|
||
|
|
bssl::UniquePtr<EC_GROUP> group = GetCurve(t, "Curve");
|
||
|
|
ASSERT_TRUE(group);
|
||
|
|
if (custom_group) {
|
||
|
|
group = MakeCustomClone(group.get());
|
||
|
|
ASSERT_TRUE(group);
|
||
|
|
}
|
||
|
|
bssl::UniquePtr<BIGNUM> priv_key = GetBIGNUM(t, "Private");
|
||
|
|
ASSERT_TRUE(priv_key);
|
||
|
|
bssl::UniquePtr<BIGNUM> x = GetBIGNUM(t, "X");
|
||
|
|
ASSERT_TRUE(x);
|
||
|
|
bssl::UniquePtr<BIGNUM> y = GetBIGNUM(t, "Y");
|
||
|
|
ASSERT_TRUE(y);
|
||
|
|
bssl::UniquePtr<BIGNUM> k = GetBIGNUM(t, "K");
|
||
|
|
ASSERT_TRUE(k);
|
||
|
|
bssl::UniquePtr<BIGNUM> r = GetBIGNUM(t, "R");
|
||
|
|
ASSERT_TRUE(r);
|
||
|
|
bssl::UniquePtr<BIGNUM> s = GetBIGNUM(t, "S");
|
||
|
|
ASSERT_TRUE(s);
|
||
|
|
std::vector<uint8_t> digest;
|
||
|
|
ASSERT_TRUE(t->GetBytes(&digest, "Digest"));
|
||
|
|
|
||
|
|
bssl::UniquePtr<EC_KEY> key(EC_KEY_new());
|
||
|
|
ASSERT_TRUE(key);
|
||
|
|
bssl::UniquePtr<EC_POINT> pub_key(EC_POINT_new(group.get()));
|
||
|
|
ASSERT_TRUE(pub_key);
|
||
|
|
ASSERT_TRUE(EC_KEY_set_group(key.get(), group.get()));
|
||
|
|
ASSERT_TRUE(EC_KEY_set_private_key(key.get(), priv_key.get()));
|
||
|
|
ASSERT_TRUE(EC_POINT_set_affine_coordinates_GFp(
|
||
|
|
group.get(), pub_key.get(), x.get(), y.get(), nullptr));
|
||
|
|
ASSERT_TRUE(EC_KEY_set_public_key(key.get(), pub_key.get()));
|
||
|
|
ASSERT_TRUE(EC_KEY_check_key(key.get()));
|
||
|
|
|
||
|
|
// Set the fixed k for testing purposes.
|
||
|
|
key->fixed_k = k.release();
|
||
|
|
bssl::UniquePtr<ECDSA_SIG> sig(
|
||
|
|
ECDSA_do_sign(digest.data(), digest.size(), key.get()));
|
||
|
|
ASSERT_TRUE(sig);
|
||
|
|
|
||
|
|
EXPECT_EQ(0, BN_cmp(r.get(), sig->r));
|
||
|
|
EXPECT_EQ(0, BN_cmp(s.get(), sig->s));
|
||
|
|
}
|
||
|
|
});
|
||
|
|
}
|