QUIC: don't ignore SetKey and SetNoncePrefix return values.

net/quic/crypto/crypto_server_config.cc

Index: net/quic/crypto/crypto_server_config.cc
diff --git a/net/quic/crypto/crypto_server_config.cc b/net/quic/crypto/crypto_server_config.cc
index 7c7d0ff7f767252e33e3e50860dca6c92971b789..4ff51c438992e9cd5c569875aa9fec04a1b0367c 100644
--- a/net/quic/crypto/crypto_server_config.cc
+++ b/net/quic/crypto/crypto_server_config.cc
@@ -449,9 +449,12 @@ QuicErrorCode QuicCryptoServerConfig::ProcessClientHello(
     hkdf_input.append(requested_config->serialized);
 
     CrypterPair crypters;
-    CryptoUtils::DeriveKeys(params->initial_premaster_secret, params->aead,
-                            info.client_nonce, info.server_nonce, hkdf_input,
-                            CryptoUtils::SERVER, &crypters);
+    if (!CryptoUtils::DeriveKeys(params->initial_premaster_secret, params->aead,
+                                 info.client_nonce, info.server_nonce,
+                                 hkdf_input, CryptoUtils::SERVER, &crypters)) {
+      *error_details = "Symmetric key setup failed";
+      return QUIC_CRYPTO_SYMMETRIC_KEY_SETUP_FAILED;
+    }
 
     scoped_ptr<QuicData> cetv_plaintext(crypters.decrypter->DecryptPacket(
         0 /* sequence number */, StringPiece() /* associated data */,
@@ -486,9 +489,13 @@ QuicErrorCode QuicCryptoServerConfig::ProcessClientHello(
   hkdf_input.append(QuicCryptoConfig::kInitialLabel, label_len);
   hkdf_input.append(hkdf_suffix);
 
-  CryptoUtils::DeriveKeys(params->initial_premaster_secret, params->aead,
-                          info.client_nonce, info.server_nonce, hkdf_input,
-                          CryptoUtils::SERVER, &params->initial_crypters);
+  if (!CryptoUtils::DeriveKeys(params->initial_premaster_secret, params->aead,
+                               info.client_nonce, info.server_nonce, hkdf_input,
+                               CryptoUtils::SERVER,
+                               &params->initial_crypters)) {
+    *error_details = "Symmetric key setup failed";
+    return QUIC_CRYPTO_SYMMETRIC_KEY_SETUP_FAILED;
+  }
 
   string forward_secure_public_value;
   if (ephemeral_key_source_.get()) {
@@ -515,10 +522,13 @@ QuicErrorCode QuicCryptoServerConfig::ProcessClientHello(
                                    label_len);
   forward_secure_hkdf_input.append(hkdf_suffix);
 
-  CryptoUtils::DeriveKeys(params->forward_secure_premaster_secret, params->aead,
-                          info.client_nonce, info.server_nonce,
-                          forward_secure_hkdf_input, CryptoUtils::SERVER,
-                          &params->forward_secure_crypters);
+  if (!CryptoUtils::DeriveKeys(
+           params->forward_secure_premaster_secret, params->aead,
+           info.client_nonce, info.server_nonce, forward_secure_hkdf_input,
+           CryptoUtils::SERVER, &params->forward_secure_crypters)) {
+    *error_details = "Symmetric key setup failed";
+    return QUIC_CRYPTO_SYMMETRIC_KEY_SETUP_FAILED;
+  }
 
   out->set_tag(kSHLO);
   out->SetStringPiece(kSourceAddressTokenTag,