Change the QuicEncrypter to accept a pre-allocated buffer instead of

net/quic/crypto/quic_crypto_client_config.cc

 // 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.
 
 #include "net/quic/crypto/quic_crypto_client_config.h"
 
 #include "base/metrics/histogram.h"
 #include "base/metrics/sparse_histogram.h"
 #include "base/profiler/scoped_tracker.h"
 #include "base/stl_util.h"
@@ skipping 527 matching lines @@
     if (!CryptoUtils::DeriveKeys(out_params->initial_premaster_secret,
                                  out_params->aead, out_params->client_nonce,
                                  out_params->server_nonce, hkdf_input,
                                  CryptoUtils::CLIENT, &crypters,
                                  nullptr /* subkey secret */)) {
       *error_details = "Symmetric key setup failed";
       return QUIC_CRYPTO_SYMMETRIC_KEY_SETUP_FAILED;
     }
 
     const QuicData& cetv_plaintext = cetv.GetSerialized();
-    scoped_ptr<QuicData> cetv_ciphertext(crypters.encrypter->EncryptPacket(
-        0 /* sequence number */,
-        StringPiece() /* associated data */,
-        cetv_plaintext.AsStringPiece()));
-    if (!cetv_ciphertext.get()) {
+    const size_t encrypted_len =
+        crypters.encrypter->GetCiphertextSize(cetv_plaintext.length());
+    scoped_ptr<char[]> output(new char[encrypted_len]);
+    size_t output_size = 0;
+    if (!crypters.encrypter->EncryptPacket(
+            0 /* sequence number */, StringPiece() /* associated data */,
+            cetv_plaintext.AsStringPiece(), output.get(), &output_size,
+            encrypted_len)) {
       *error_details = "Packet encryption failed";
       return QUIC_ENCRYPTION_FAILURE;
     }
 
-    out->SetStringPiece(kCETV, cetv_ciphertext->AsStringPiece());
+    out->SetStringPiece(kCETV, StringPiece(output.get(), output_size));
     out->MarkDirty();
 
     out->set_minimum_size(orig_min_size);
   }
 
   // Derive the symmetric keys and set up the encrypters and decrypters.
   // Set the following members of out_params:
   //   out_params->hkdf_input_suffix
   //   out_params->initial_crypters
   out_params->hkdf_input_suffix.clear();
@@ skipping 312 matching lines @@
   }
 
   // Update canonical version to point at the "most recent" entry.
   canonical_server_map_[suffix_server_id] = server_id;
 
   server_state->InitializeFrom(*canonical_state);
   return true;
 }
 
 }  // namespace net