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// Copyright (c) 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/third_party/quiche/src/quic/core/crypto/p256_key_exchange.h"
#include <cstdint>
#include <cstring>
#include <memory>
#include <string>
#include <utility>
#include "third_party/boringssl/src/include/openssl/ec.h"
#include "third_party/boringssl/src/include/openssl/ecdh.h"
#include "third_party/boringssl/src/include/openssl/err.h"
#include "third_party/boringssl/src/include/openssl/evp.h"
#include "net/third_party/quiche/src/quic/platform/api/quic_logging.h"
#include "net/third_party/quiche/src/quic/platform/api/quic_ptr_util.h"
#include "net/third_party/quiche/src/common/platform/api/quiche_string_piece.h"
namespace quic {
P256KeyExchange::P256KeyExchange(bssl::UniquePtr<EC_KEY> private_key,
const uint8_t* public_key)
: private_key_(std::move(private_key)) {
memcpy(public_key_, public_key, sizeof(public_key_));
}
P256KeyExchange::~P256KeyExchange() {}
// static
std::unique_ptr<P256KeyExchange> P256KeyExchange::New() {
return New(P256KeyExchange::NewPrivateKey());
}
// static
std::unique_ptr<P256KeyExchange> P256KeyExchange::New(
quiche::QuicheStringPiece key) {
if (key.empty()) {
QUIC_DLOG(INFO) << "Private key is empty";
return nullptr;
}
const uint8_t* keyp = reinterpret_cast<const uint8_t*>(key.data());
bssl::UniquePtr<EC_KEY> private_key(
d2i_ECPrivateKey(nullptr, &keyp, key.size()));
if (!private_key.get() || !EC_KEY_check_key(private_key.get())) {
QUIC_DLOG(INFO) << "Private key is invalid.";
return nullptr;
}
uint8_t public_key[kUncompressedP256PointBytes];
if (EC_POINT_point2oct(EC_KEY_get0_group(private_key.get()),
EC_KEY_get0_public_key(private_key.get()),
POINT_CONVERSION_UNCOMPRESSED, public_key,
sizeof(public_key), nullptr) != sizeof(public_key)) {
QUIC_DLOG(INFO) << "Can't get public key.";
return nullptr;
}
return QuicWrapUnique(
new P256KeyExchange(std::move(private_key), public_key));
}
// static
std::string P256KeyExchange::NewPrivateKey() {
bssl::UniquePtr<EC_KEY> key(EC_KEY_new_by_curve_name(NID_X9_62_prime256v1));
if (!key.get() || !EC_KEY_generate_key(key.get())) {
QUIC_DLOG(INFO) << "Can't generate a new private key.";
return std::string();
}
int key_len = i2d_ECPrivateKey(key.get(), nullptr);
if (key_len <= 0) {
QUIC_DLOG(INFO) << "Can't convert private key to string";
return std::string();
}
std::unique_ptr<uint8_t[]> private_key(new uint8_t[key_len]);
uint8_t* keyp = private_key.get();
if (!i2d_ECPrivateKey(key.get(), &keyp)) {
QUIC_DLOG(INFO) << "Can't convert private key to string.";
return std::string();
}
return std::string(reinterpret_cast<char*>(private_key.get()), key_len);
}
bool P256KeyExchange::CalculateSharedKeySync(
quiche::QuicheStringPiece peer_public_value,
std::string* shared_key) const {
if (peer_public_value.size() != kUncompressedP256PointBytes) {
QUIC_DLOG(INFO) << "Peer public value is invalid";
return false;
}
bssl::UniquePtr<EC_POINT> point(
EC_POINT_new(EC_KEY_get0_group(private_key_.get())));
if (!point.get() ||
!EC_POINT_oct2point(/* also test if point is on curve */
EC_KEY_get0_group(private_key_.get()), point.get(),
reinterpret_cast<const uint8_t*>(
peer_public_value.data()),
peer_public_value.size(), nullptr)) {
QUIC_DLOG(INFO) << "Can't convert peer public value to curve point.";
return false;
}
uint8_t result[kP256FieldBytes];
if (ECDH_compute_key(result, sizeof(result), point.get(), private_key_.get(),
nullptr) != sizeof(result)) {
QUIC_DLOG(INFO) << "Can't compute ECDH shared key.";
return false;
}
shared_key->assign(reinterpret_cast<char*>(result), sizeof(result));
return true;
}
quiche::QuicheStringPiece P256KeyExchange::public_value() const {
return quiche::QuicheStringPiece(reinterpret_cast<const char*>(public_key_),
sizeof(public_key_));
}
} // namespace quic
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