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// Copyright (c) 2011 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 "remoting/host/host_secret.h"
#include <string>
#include "base/logging.h"
#include "base/rand_util.h"
#include "base/string_number_conversions.h"
namespace remoting {
namespace {
// 5 digits means 100K possible host secrets with uniform distribution, which
// should be enough for short-term passwords, given that we rate-limit guesses
// in the cloud and expire access codes after a small number of attempts.
const int kHostSecretLength = 5;
const char kHostSecretAlphabet[] = "0123456789";
// Generates cryptographically strong random number in the range [0, max).
int CryptoRandomInt(int max) {
uint32 random_int32;
base::RandBytes(&random_int32, sizeof(random_int32));
return random_int32 % max;
}
} // namespace
std::string GenerateSupportHostSecret() {
std::string result;
int alphabet_size = strlen(kHostSecretAlphabet);
result.resize(kHostSecretLength);
for (int i = 0; i < kHostSecretLength; ++i) {
result[i] = kHostSecretAlphabet[CryptoRandomInt(alphabet_size)];
}
return result;
}
} // namespace remoting
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