Implement an openssl version of a QUIC ProofSource.

net/quic/crypto/proof_source_chromium.h

 // Copyright 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_CHROMIUM_H_
 #define NET_QUIC_CRYPTO_PROOF_SOURCE_CHROMIUM_H_
 
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
+#include "base/files/file_util.h"
+#include "crypto/rsa_private_key.h"
 #include "net/base/net_export.h"
+#include "net/cert/x509_certificate.h"
 #include "net/quic/crypto/proof_source.h"
 
 namespace net {
 
 // ProofSourceChromium implements the QUIC ProofSource interface.
 // TODO(rtenneti): implement details of this class.
 class NET_EXPORT_PRIVATE ProofSourceChromium : public ProofSource {
  public:
   ProofSourceChromium();
-  ~ProofSourceChromium() override {}
+  ~ProofSourceChromium() override;
+
+  // Initializes this object based on the certificate chain in |cert_path|,
+  // and the PKCS#8 RSA private key in |key_path|.
+  bool Initialize(const base::FilePath& cert_path,
+                  const base::FilePath& key_path);
 
   // ProofSource interface
   bool GetProof(const IPAddressNumber& server_ip,
                 const std::string& hostname,
                 const std::string& server_config,
                 bool ecdsa_ok,
                 const std::vector<std::string>** out_certs,
                 std::string* out_signature) override;
 
  private:
+  scoped_ptr<crypto::RSAPrivateKey> private_key_;
+  std::vector<std::string> certificates_;
+
   DISALLOW_COPY_AND_ASSIGN(ProofSourceChromium);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_CRYPTO_PROOF_SOURCE_CHROMIUM_H_