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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.
#ifndef NET_QUIC_CRYPTO_P256_KEY_EXCHANGE_H_
#define NET_QUIC_CRYPTO_P256_KEY_EXCHANGE_H_
#include <stdint.h>
#include <memory>
#include <string>
#include "base/macros.h"
#include "base/strings/string_piece.h"
#include "crypto/openssl_util.h"
#include "crypto/scoped_openssl_types.h"
#include "net/base/net_export.h"
#include "net/quic/crypto/key_exchange.h"
namespace net {
// P256KeyExchange implements a KeyExchange using elliptic-curve
// Diffie-Hellman on NIST P-256.
class NET_EXPORT_PRIVATE P256KeyExchange : public KeyExchange {
public:
~P256KeyExchange() override;
// New creates a new key exchange object from a private key. If
// |private_key| is invalid, nullptr is returned.
static P256KeyExchange* New(base::StringPiece private_key);
// |NewPrivateKey| returns a private key, suitable for passing to |New|.
// If |NewPrivateKey| can't generate a private key, it returns an empty
// string.
static std::string NewPrivateKey();
// KeyExchange interface.
KeyExchange* NewKeyPair(QuicRandom* rand) const override;
bool CalculateSharedKey(base::StringPiece peer_public_value,
std::string* shared_key) const override;
base::StringPiece public_value() const override;
QuicTag tag() const override;
private:
enum {
// A P-256 field element consists of 32 bytes.
kP256FieldBytes = 32,
// A P-256 point in uncompressed form consists of 0x04 (to denote
// that the point is uncompressed) followed by two, 32-byte field
// elements.
kUncompressedP256PointBytes = 1 + 2 * kP256FieldBytes,
// The first byte in an uncompressed P-256 point.
kUncompressedECPointForm = 0x04,
};
// P256KeyExchange takes ownership of |private_key|, and expects
// |public_key| consists of |kUncompressedP256PointBytes| bytes.
P256KeyExchange(EC_KEY* private_key, const uint8_t* public_key);
crypto::ScopedEC_KEY private_key_;
// The public key stored as an uncompressed P-256 point.
uint8_t public_key_[kUncompressedP256PointBytes];
DISALLOW_COPY_AND_ASSIGN(P256KeyExchange);
};
} // namespace net
#endif // NET_QUIC_CRYPTO_P256_KEY_EXCHANGE_H_
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