// 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_PROOF_SOURCE_H_
#define NET_QUIC_CRYPTO_PROOF_SOURCE_H_

#include <string>
#include <vector>

#include "net/base/net_export.h"
#include "net/quic/quic_protocol.h"

namespace net {

// ProofSource is an interface by which a QUIC server can obtain certificate
// chains and signatures that prove its identity.
class NET_EXPORT_PRIVATE ProofSource {
 public:
  virtual ~ProofSource() {}

  // GetProof finds a certificate chain for |hostname|, sets |out_certs| to
  // point to it (in leaf-first order), calculates a signature of
  // |server_config| using that chain and puts the result in |out_signature|.
  //
  // The signature uses SHA-256 as the hash function and PSS padding when the
  // key is RSA.
  //
  // The signature uses SHA-256 as the hash function when the key is ECDSA.
  //
  // If |ecdsa_ok| is true, the signature may use an ECDSA key. Otherwise, the
  // signature must use an RSA key.
  //
  // |version| is the QUIC version for the connection. TODO(wtc): Remove once
  // QUIC_VERSION_7 and before are removed.
  //
  // |out_certs| is a pointer to a pointer, not a pointer to an array.
  //
  // The number of certificate chains is expected to be small and fixed thus
  // the ProofSource retains ownership of the contents of |out_certs|. The
  // expectation is that they will be cached forever.
  //
  // The signature values should be cached because |server_config| will be
  // somewhat static. However, since they aren't bounded, the ProofSource may
  // wish to evicit entries from that cache, thus the caller takes ownership of
  // |*out_signature|.
  //
  // |hostname| may be empty to signify that a default certificate should be
  // used.
  //
  // This function may be called concurrently.
  virtual bool GetProof(QuicVersion version,
                        const std::string& hostname,
                        const std::string& server_config,
                        bool ecdsa_ok,
                        const std::vector<std::string>** out_certs,
                        std::string* out_signature) = 0;
};

}  // namespace net

#endif  // NET_QUIC_CRYPTO_PROOF_SOURCE_H_