net: make QUIC ProofVerifier more generic.

net/quic/crypto/proof_verifier.h

 // 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"
 
 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:
-  virtual ~ProofVerifier() {}
+  // 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 OK.
-  // On failure, it returns ERR_FAILED and sets |*error_details| to a
-  // description of the problem. This function may also return ERR_IO_PENDING,
-  // in which case the |callback| will be run on the calling thread with the
-  // final OK/ERR_FAILED result when the proof is verified.
+  // 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.
-  //
-  // Note: this is just for testing. The CN of the certificate is ignored and
-  // wildcards in the SANs are not supported.
-  virtual int VerifyProof(const std::string& hostname,
-                          const std::string& server_config,
-                          const std::vector<std::string>& certs,
-                          const std::string& signature,
-                          std::string* error_details,
-                          CertVerifyResult* cert_verify_result,
-                          const CompletionCallback& callback) = 0;
+  virtual Status VerifyProof(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_