ref: bfe9da47cfa2f51ebef78c59332b5ba2deba306d
dir: /third_party/boringssl/src/crypto/ecdh_extra/ecdh_test.cc/
/* Copyright (c) 2016, Google Inc.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
#include <stdio.h>
#include <utility>
#include <vector>
#include <gtest/gtest.h>
#include <openssl/bn.h>
#include <openssl/bytestring.h>
#include <openssl/crypto.h>
#include <openssl/ec.h>
#include <openssl/ec_key.h>
#include <openssl/ecdh.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/nid.h>
#include <openssl/sha.h>
#include "../test/file_test.h"
#include "../test/test_util.h"
#include "../test/wycheproof_util.h"
static bssl::UniquePtr<EC_GROUP> GetCurve(FileTest *t, const char *key) {
std::string curve_name;
if (!t->GetAttribute(&curve_name, key)) {
return nullptr;
}
if (curve_name == "P-224") {
return bssl::UniquePtr<EC_GROUP>(EC_GROUP_new_by_curve_name(NID_secp224r1));
}
if (curve_name == "P-256") {
return bssl::UniquePtr<EC_GROUP>(EC_GROUP_new_by_curve_name(
NID_X9_62_prime256v1));
}
if (curve_name == "P-384") {
return bssl::UniquePtr<EC_GROUP>(EC_GROUP_new_by_curve_name(NID_secp384r1));
}
if (curve_name == "P-521") {
return bssl::UniquePtr<EC_GROUP>(EC_GROUP_new_by_curve_name(NID_secp521r1));
}
t->PrintLine("Unknown curve '%s'", curve_name.c_str());
return nullptr;
}
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(ECDHTest, TestVectors) {
FileTestGTest("crypto/ecdh_extra/ecdh_tests.txt", [](FileTest *t) {
bssl::UniquePtr<EC_GROUP> group = GetCurve(t, "Curve");
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> peer_x = GetBIGNUM(t, "PeerX");
ASSERT_TRUE(peer_x);
bssl::UniquePtr<BIGNUM> peer_y = GetBIGNUM(t, "PeerY");
ASSERT_TRUE(peer_y);
std::vector<uint8_t> z;
ASSERT_TRUE(t->GetBytes(&z, "Z"));
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<EC_POINT> peer_pub_key(EC_POINT_new(group.get()));
ASSERT_TRUE(peer_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_POINT_set_affine_coordinates_GFp(
group.get(), peer_pub_key.get(), peer_x.get(), peer_y.get(), nullptr));
ASSERT_TRUE(EC_KEY_set_public_key(key.get(), pub_key.get()));
ASSERT_TRUE(EC_KEY_check_key(key.get()));
std::vector<uint8_t> actual_z;
// Make |actual_z| larger than expected to ensure |ECDH_compute_key| returns
// the right amount of data.
actual_z.resize(z.size() + 1);
int ret = ECDH_compute_key(actual_z.data(), actual_z.size(),
peer_pub_key.get(), key.get(), nullptr);
ASSERT_GE(ret, 0);
EXPECT_EQ(Bytes(z), Bytes(actual_z.data(), static_cast<size_t>(ret)));
// Test |ECDH_compute_key| truncates.
actual_z.resize(z.size() - 1);
ret = ECDH_compute_key(actual_z.data(), actual_z.size(), peer_pub_key.get(),
key.get(), nullptr);
ASSERT_GE(ret, 0);
EXPECT_EQ(Bytes(z.data(), z.size() - 1),
Bytes(actual_z.data(), static_cast<size_t>(ret)));
// Test that |ECDH_compute_key_fips| hashes as expected.
uint8_t digest[SHA256_DIGEST_LENGTH], expected_digest[SHA256_DIGEST_LENGTH];
ASSERT_TRUE(ECDH_compute_key_fips(digest, sizeof(digest),
peer_pub_key.get(), key.get()));
SHA256(z.data(), z.size(), expected_digest);
EXPECT_EQ(Bytes(digest), Bytes(expected_digest));
});
}
static void RunWycheproofTest(FileTest *t) {
t->IgnoreInstruction("encoding");
bssl::UniquePtr<EC_GROUP> group = GetWycheproofCurve(t, "curve", true);
ASSERT_TRUE(group);
bssl::UniquePtr<BIGNUM> priv_key = GetWycheproofBIGNUM(t, "private", false);
ASSERT_TRUE(priv_key);
std::vector<uint8_t> peer_spki;
ASSERT_TRUE(t->GetBytes(&peer_spki, "public"));
WycheproofResult result;
ASSERT_TRUE(GetWycheproofResult(t, &result));
std::vector<uint8_t> shared;
ASSERT_TRUE(t->GetBytes(&shared, "shared"));
// BoringSSL supports compressed coordinates.
bool is_valid = result.IsValid({"CompressedPoint"});
// Wycheproof stores the peer key in an SPKI to mimic a Java API mistake.
// This is non-standard and error-prone.
CBS cbs;
CBS_init(&cbs, peer_spki.data(), peer_spki.size());
bssl::UniquePtr<EVP_PKEY> peer_evp(EVP_parse_public_key(&cbs));
if (!peer_evp || CBS_len(&cbs) != 0) {
EXPECT_FALSE(is_valid);
return;
}
EC_KEY *peer_ec = EVP_PKEY_get0_EC_KEY(peer_evp.get());
ASSERT_TRUE(peer_ec);
bssl::UniquePtr<EC_KEY> key(EC_KEY_new());
ASSERT_TRUE(key);
ASSERT_TRUE(EC_KEY_set_group(key.get(), group.get()));
ASSERT_TRUE(EC_KEY_set_private_key(key.get(), priv_key.get()));
std::vector<uint8_t> actual((EC_GROUP_get_degree(group.get()) + 7) / 8);
int ret =
ECDH_compute_key(actual.data(), actual.size(),
EC_KEY_get0_public_key(peer_ec), key.get(), nullptr);
if (is_valid) {
EXPECT_EQ(static_cast<int>(actual.size()), ret);
EXPECT_EQ(Bytes(shared), Bytes(actual.data(), static_cast<size_t>(ret)));
} else {
EXPECT_EQ(-1, ret);
}
}
TEST(ECDHTest, WycheproofP224) {
FileTestGTest("third_party/wycheproof_testvectors/ecdh_secp224r1_test.txt",
RunWycheproofTest);
}
TEST(ECDHTest, WycheproofP256) {
FileTestGTest("third_party/wycheproof_testvectors/ecdh_secp256r1_test.txt",
RunWycheproofTest);
}
TEST(ECDHTest, WycheproofP384) {
FileTestGTest("third_party/wycheproof_testvectors/ecdh_secp384r1_test.txt",
RunWycheproofTest);
}
TEST(ECDHTest, WycheproofP512) {
FileTestGTest("third_party/wycheproof_testvectors/ecdh_secp521r1_test.txt",
RunWycheproofTest);
}
// MakeCustomGroup returns an |EC_GROUP| containing a non-standard group. (P-256
// with the wrong generator.)
static bssl::UniquePtr<EC_GROUP> MakeCustomGroup() {
static const uint8_t kP[] = {
0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
};
static const uint8_t kA[] = {
0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfc,
};
static const uint8_t kB[] = {
0x5a, 0xc6, 0x35, 0xd8, 0xaa, 0x3a, 0x93, 0xe7, 0xb3, 0xeb, 0xbd,
0x55, 0x76, 0x98, 0x86, 0xbc, 0x65, 0x1d, 0x06, 0xb0, 0xcc, 0x53,
0xb0, 0xf6, 0x3b, 0xce, 0x3c, 0x3e, 0x27, 0xd2, 0x60, 0x4b,
};
static const uint8_t kX[] = {
0xe6, 0x2b, 0x69, 0xe2, 0xbf, 0x65, 0x9f, 0x97, 0xbe, 0x2f, 0x1e,
0x0d, 0x94, 0x8a, 0x4c, 0xd5, 0x97, 0x6b, 0xb7, 0xa9, 0x1e, 0x0d,
0x46, 0xfb, 0xdd, 0xa9, 0xa9, 0x1e, 0x9d, 0xdc, 0xba, 0x5a,
};
static const uint8_t kY[] = {
0x01, 0xe7, 0xd6, 0x97, 0xa8, 0x0a, 0x18, 0xf9, 0xc3, 0xc4, 0xa3,
0x1e, 0x56, 0xe2, 0x7c, 0x83, 0x48, 0xdb, 0x16, 0x1a, 0x1c, 0xf5,
0x1d, 0x7e, 0xf1, 0x94, 0x2d, 0x4b, 0xcf, 0x72, 0x22, 0xc1,
};
static const uint8_t kOrder[] = {
0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xbc, 0xe6, 0xfa, 0xad, 0xa7, 0x17,
0x9e, 0x84, 0xf3, 0xb9, 0xca, 0xc2, 0xfc, 0x63, 0x25, 0x51,
};
bssl::UniquePtr<BN_CTX> ctx(BN_CTX_new());
bssl::UniquePtr<BIGNUM> p(BN_bin2bn(kP, sizeof(kP), nullptr));
bssl::UniquePtr<BIGNUM> a(BN_bin2bn(kA, sizeof(kA), nullptr));
bssl::UniquePtr<BIGNUM> b(BN_bin2bn(kB, sizeof(kB), nullptr));
bssl::UniquePtr<BIGNUM> x(BN_bin2bn(kX, sizeof(kX), nullptr));
bssl::UniquePtr<BIGNUM> y(BN_bin2bn(kY, sizeof(kY), nullptr));
bssl::UniquePtr<BIGNUM> order(BN_bin2bn(kOrder, sizeof(kOrder), nullptr));
if (!ctx || !p || !a || !b || !x || !y || !order) {
return nullptr;
}
bssl::UniquePtr<EC_GROUP> group(
EC_GROUP_new_curve_GFp(p.get(), a.get(), b.get(), ctx.get()));
if (!group) {
return nullptr;
}
bssl::UniquePtr<EC_POINT> generator(EC_POINT_new(group.get()));
if (!generator ||
!EC_POINT_set_affine_coordinates_GFp(group.get(), generator.get(),
x.get(), y.get(), ctx.get()) ||
!EC_GROUP_set_generator(group.get(), generator.get(), order.get(),
BN_value_one())) {
return nullptr;
}
return group;
}
TEST(ECDHTest, GroupMismatch) {
const size_t num_curves = EC_get_builtin_curves(nullptr, 0);
std::vector<EC_builtin_curve> curves(num_curves);
EC_get_builtin_curves(curves.data(), num_curves);
// Instantiate all the built-in curves.
std::vector<bssl::UniquePtr<EC_GROUP>> groups;
for (const auto &curve : curves) {
groups.emplace_back(EC_GROUP_new_by_curve_name(curve.nid));
ASSERT_TRUE(groups.back());
}
// Also create some arbitrary group. (This is P-256 with the wrong generator.)
groups.push_back(MakeCustomGroup());
ASSERT_TRUE(groups.back());
for (const auto &a : groups) {
for (const auto &b : groups) {
if (a.get() == b.get()) {
continue;
}
bssl::UniquePtr<EC_KEY> key(EC_KEY_new());
ASSERT_TRUE(EC_KEY_set_group(key.get(), a.get()));
ASSERT_TRUE(EC_KEY_generate_key(key.get()));
// ECDH across the groups should not work.
char out[64];
const EC_POINT *peer = EC_GROUP_get0_generator(b.get());
EXPECT_EQ(-1,
ECDH_compute_key(out, sizeof(out), peer, key.get(), nullptr));
ERR_clear_error();
}
}
}