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// Copyright (c) 2012 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/null_encrypter.h"
#include "net/quic/quic_data_writer.h"
#include "net/quic/quic_utils.h"
using base::StringPiece;
using std::string;
namespace net {
const size_t kHashSizeShort = 12; // size of uint128 serialized short
NullEncrypter::NullEncrypter() {}
bool NullEncrypter::SetKey(StringPiece key) {
return key.empty();
}
bool NullEncrypter::SetNoncePrefix(StringPiece nonce_prefix) {
return nonce_prefix.empty();
}
bool NullEncrypter::EncryptPacket(QuicPathId /*path_id*/,
QuicPacketNumber /*packet_number*/,
StringPiece associated_data,
StringPiece plaintext,
char* output,
size_t* output_length,
size_t max_output_length) {
const size_t len = plaintext.size() + GetHashLength();
if (max_output_length < len) {
return false;
}
uint128 hash = QuicUtils::FNV1a_128_Hash_Two(
associated_data.data(), associated_data.size(), plaintext.data(),
plaintext.size());
// TODO(ianswett): memmove required for in place encryption. Placing the
// hash at the end would allow use of memcpy, doing nothing for in place.
memmove(output + GetHashLength(), plaintext.data(), plaintext.length());
QuicUtils::SerializeUint128Short(hash,
reinterpret_cast<unsigned char*>(output));
*output_length = len;
return true;
}
size_t NullEncrypter::GetKeySize() const {
return 0;
}
size_t NullEncrypter::GetNoncePrefixSize() const {
return 0;
}
size_t NullEncrypter::GetMaxPlaintextSize(size_t ciphertext_size) const {
return ciphertext_size - GetHashLength();
}
size_t NullEncrypter::GetCiphertextSize(size_t plaintext_size) const {
return plaintext_size + GetHashLength();
}
StringPiece NullEncrypter::GetKey() const {
return StringPiece();
}
StringPiece NullEncrypter::GetNoncePrefix() const {
return StringPiece();
}
size_t NullEncrypter::GetHashLength() const {
return kHashSizeShort;
}
} // namespace net
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