List message decryption failures on chrome://gcm-internals

components/gcm_driver/crypto/gcm_encryption_provider.cc

 // Copyright 2015 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.
 
 #include "components/gcm_driver/crypto/gcm_encryption_provider.h"
 
 #include <vector>
 
 #include "base/base64.h"
 #include "base/bind.h"
@@ skipping 11 matching lines @@
 
 const char kEncryptionProperty[] = "encryption";
 const char kCryptoKeyProperty[] = "crypto_key";
 
 // Directory in the GCM Store in which the encryption database will be stored.
 const base::FilePath::CharType kEncryptionDirectoryName[] =
     FILE_PATH_LITERAL("Encryption");
 
 }  // namespace
 
+std::string GCMEncryptionProvider::ToDecryptionFailureDetailsString(
+    DecryptionFailure reason) {
+  switch(reason) {
+    case DECRYPTION_FAILURE_UNKNOWN:
+      return "Unknown failure";
+    case DECRYPTION_FAILURE_INVALID_ENCRYPTION_HEADER:
+      return "Invalid format for the Encryption header";
+    case DECRYPTION_FAILURE_INVALID_CRYPTO_KEY_HEADER:
+      return "Invalid format for the Crypto-Key header";
+    case DECRYPTION_FAILURE_NO_KEYS:
+      return "There are no associated keys with the subscription";
+    case DECRYPTION_FAILURE_INVALID_PUBLIC_KEY:
+      return "The public key in the Crypto-Key header is invalid";
+    case DECRYPTION_FAILURE_INVALID_PAYLOAD:
+      return "AES-GCM decryption failed";
+  }
+
+  NOTREACHED();
+  return "(invalid reason)";
+}
+
 GCMEncryptionProvider::GCMEncryptionProvider()
     : weak_ptr_factory_(this) {
 }
 
 GCMEncryptionProvider::~GCMEncryptionProvider() {
 }
 
 void GCMEncryptionProvider::Init(
     const base::FilePath& store_path,
     const scoped_refptr<base::SequencedTaskRunner>& blocking_task_runner) {
@@ skipping 157 matching lines @@
   decrypted_message.decrypted = true;
 
   // There must be no data associated with the decrypted message at this point,
   // to make sure that we don't end up in an infinite decryption loop.
   DCHECK_EQ(0u, decrypted_message.data.size());
 
   success_callback.Run(decrypted_message);
 }
 
 }  // namespace gcm