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Unified Diff: net/quic/crypto/aes_128_gcm_encrypter_nss.cc

Issue 12623017: Add Aes128GcmEncrypter and Aes128GcmDecrypter (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src/
Patch Set: Fix build errors. Add GetKey and GetNoncePrefix. Created 7 years, 9 months ago
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Index: net/quic/crypto/aes_128_gcm_encrypter_nss.cc
===================================================================
--- net/quic/crypto/aes_128_gcm_encrypter_nss.cc (revision 0)
+++ net/quic/crypto/aes_128_gcm_encrypter_nss.cc (revision 0)
@@ -0,0 +1,94 @@
+// 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.
+
+#include "net/quic/crypto/aes_128_gcm_encrypter.h"
+
+#include <string.h>
+
+#include "base/memory/scoped_ptr.h"
+
+using base::StringPiece;
+
+namespace net {
+
+namespace {
+
+const size_t kKeySize = 16;
+const size_t kNoncePrefixSize = 4;
+const size_t kAuthTagSize = 16;
+
+} // namespace
+
+// static
+bool Aes128GcmEncrypter::IsSupported() {
+ return false;
+}
+
+bool Aes128GcmEncrypter::SetKey(StringPiece key) {
+ DCHECK_EQ(key.size(), sizeof(key_));
+ if (key.size() != sizeof(key_)) {
+ return false;
+ }
+ memcpy(key_, key.data(), key.size());
+ return true;
+}
+
+bool Aes128GcmEncrypter::SetNoncePrefix(StringPiece nonce_prefix) {
+ DCHECK_EQ(nonce_prefix.size(), kNoncePrefixSize);
+ if (nonce_prefix.size() != kNoncePrefixSize) {
+ return false;
+ }
+ memcpy(nonce_, nonce_prefix.data(), nonce_prefix.size());
+ return true;
+}
+
+QuicData* Aes128GcmEncrypter::Encrypt(QuicPacketSequenceNumber sequence_number,
+ StringPiece associated_data,
+ StringPiece plaintext) {
+ COMPILE_ASSERT(sizeof(nonce_) == kNoncePrefixSize + sizeof(sequence_number),
+ incorrect_nonce_size);
+ memcpy(nonce_ + kNoncePrefixSize, &sequence_number, sizeof(sequence_number));
+ return EncryptWithNonce(StringPiece(reinterpret_cast<char*>(nonce_),
+ sizeof(nonce_)),
+ associated_data, plaintext);
+}
+
+size_t Aes128GcmEncrypter::GetKeySize() const {
+ return kKeySize;
+}
+
+size_t Aes128GcmEncrypter::GetNoncePrefixSize() const {
+ return kNoncePrefixSize;
+}
+
+size_t Aes128GcmEncrypter::GetMaxPlaintextSize(size_t ciphertext_size) const {
+ return ciphertext_size - kAuthTagSize;
+}
+
+// An AEAD_AES_128_GCM ciphertext is exactly 16 bytes longer than its
+// corresponding plaintext.
+size_t Aes128GcmEncrypter::GetCiphertextSize(size_t plaintext_size) const {
+ return plaintext_size + kAuthTagSize;
+}
+
+QuicData* Aes128GcmEncrypter::EncryptWithNonce(StringPiece nonce,
+ StringPiece associated_data,
+ StringPiece plaintext) {
+ size_t ciphertext_size = GetCiphertextSize(plaintext.length());
+ scoped_ptr<char[]> ciphertext(new char[ciphertext_size]);
+
+ // TODO(wtc): implement this function using NSS.
+
+ return new QuicData(ciphertext.release(), ciphertext_size, true);
+}
+
+StringPiece Aes128GcmEncrypter::GetKey() const {
+ return StringPiece(reinterpret_cast<const char*>(key_), sizeof(key_));
+}
+
+StringPiece Aes128GcmEncrypter::GetNoncePrefix() const {
+ return StringPiece(reinterpret_cast<const char*>(nonce_), kNoncePrefixSize);
+}
+
+} // namespace net
Property changes on: net/quic/crypto/aes_128_gcm_encrypter_nss.cc
___________________________________________________________________
Added: svn:eol-style
+ LF

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