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diff --git a/net/quic/crypto/proof_source.h b/net/quic/crypto/proof_source.h
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+++ b/net/quic/crypto/proof_source.h
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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_PROOF_SOURCE_H_
+#define NET_QUIC_CRYPTO_PROOF_SOURCE_H_
+
+#include <string>
+#include <vector>
+
+#include "net/base/net_export.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.
+  //
+  // |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|.
+  //
+  // This function may be called concurrently.
+  virtual bool GetProof(const std::string& hostname,
+                        const std::string& server_config,
+                        const std::vector<std::string>** out_certs,
+                        std::string* out_signature) = 0;
+};
+
+}  // namespace net
+
+#endif  // NET_QUIC_CRYPTO_PROOF_SOURCE_H_