// 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_VERIFIER_H_
#define NET_QUIC_CRYPTO_PROOF_VERIFIER_H_

#include <string>
#include <vector>

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

namespace net {

class CertVerifyResult;

// ProofVerifyDetails is an abstract class that acts as a container for any
// implementation specific details that a ProofVerifier wishes to return. These
// details are saved in the CachedInfo for the origin in question.
class ProofVerifyDetails {
 public:
  virtual ~ProofVerifyDetails();
};

// ProofVerifierCallback provides a generic mechanism for a ProofVerifier to
// call back after an asynchronous verification.
class NET_EXPORT_PRIVATE ProofVerifierCallback {
 public:
  virtual ~ProofVerifierCallback();

  // Run is called on the original thread to mark the completion of an
  // asynchonous verification. If |ok| is true then the certificate is valid
  // and |*error_details| is unused. Otherwise, |*error_details| contains a
  // description of the error. |details| contains implementation-specific
  // details of the verification. |Run| may take ownership of |details| by
  // calling |release| on it.
  virtual void Run(bool ok,
                   const std::string& error_details,
                   scoped_ptr<ProofVerifyDetails>* details) = 0;
};

// A ProofVerifier checks the signature on a server config, and the certificate
// chain that backs the public key.
class NET_EXPORT_PRIVATE ProofVerifier {
 public:
  // Status enumerates the possible results of verifying a proof.
  enum Status {
    SUCCESS = 0,
    FAILURE = 1,
    // PENDING results from a verification which will occur asynchonously. When
    // the verification is complete, |callback|'s |Run| method will be called.
    PENDING = 2,
  };

  virtual ~ProofVerifier();

  // VerifyProof checks that |signature| is a valid signature of
  // |server_config| by the public key in the leaf certificate of |certs|, and
  // that |certs| is a valid chain for |hostname|. On success, it returns
  // SUCCESS. On failure, it returns ERROR and sets |*error_details| to a
  // description of the problem. In either case it may set |*details|, which the
  // caller takes ownership of.
  //
  // This function may also return PENDING, in which case the ProofVerifier
  // will call back, on the original thread, via |callback| when complete.
  //
  // This function takes ownership of |callback|. It will be deleted even if
  // the call returns immediately.
  //
  // The signature uses SHA-256 as the hash function and PSS padding in the
  // case of RSA.
  //
  // |version| is the QUIC version for the connection. TODO(wtc): Remove once
  // QUIC_VERSION_7 and before are removed.
  virtual Status VerifyProof(QuicVersion version,
                             const std::string& hostname,
                             const std::string& server_config,
                             const std::vector<std::string>& certs,
                             const std::string& signature,
                             std::string* error_details,
                             scoped_ptr<ProofVerifyDetails>* details,
                             ProofVerifierCallback* callback) = 0;
};

}  // namespace net

#endif  // NET_QUIC_CRYPTO_PROOF_VERIFIER_H_