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// 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/crypto_utils.h"
#include "base/string_piece.h"
#include "net/quic/crypto/crypto_protocol.h"
#include "net/quic/crypto/quic_random.h"
#include "net/quic/quic_clock.h"
using base::StringPiece;
using std::string;
namespace net {
// static
bool CryptoUtils::FindMutualTag(const CryptoTagVector& our_tags_vector,
const CryptoTag* their_tags,
size_t num_their_tags,
Priority priority,
CryptoTag* out_result,
size_t* out_index) {
if (our_tags_vector.empty()) {
return false;
}
const size_t num_our_tags = our_tags_vector.size();
const CryptoTag* our_tags = &our_tags_vector[0];
size_t num_priority_tags, num_inferior_tags;
const CryptoTag* priority_tags;
const CryptoTag* inferior_tags;
if (priority == LOCAL_PRIORITY) {
num_priority_tags = num_our_tags;
priority_tags = our_tags;
num_inferior_tags = num_their_tags;
inferior_tags = their_tags;
} else {
num_priority_tags = num_their_tags;
priority_tags = their_tags;
num_inferior_tags = num_our_tags;
inferior_tags = our_tags;
}
for (size_t i = 0; i < num_priority_tags; i++) {
for (size_t j = 0; j < num_inferior_tags; j++) {
if (priority_tags[i] == inferior_tags[j]) {
*out_result = priority_tags[i];
if (out_index) {
if (priority == LOCAL_PRIORITY) {
*out_index = j;
} else {
*out_index = i;
}
}
return true;
}
}
}
return false;
}
void CryptoUtils::GenerateNonce(const QuicClock* clock,
QuicRandom* random_generator,
string* nonce) {
// a 4-byte timestamp + 28 random bytes.
nonce->reserve(kNonceSize);
nonce->resize(kNonceSize);
QuicTime::Delta now = clock->NowAsDeltaSinceUnixEpoch();
uint32 gmt_unix_time = now.ToSeconds();
const size_t time_size = sizeof(gmt_unix_time);
memcpy(&(*nonce)[0], &gmt_unix_time, time_size);
random_generator->RandBytes(&(*nonce)[time_size], kNonceSize - time_size);
}
} // namespace net
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