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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/media/media_storage_id_salt.h"
#include <string>
#include "base/logging.h"
#include "base/strings/string_number_conversions.h"
#include "chrome/common/pref_names.h"
#include "components/prefs/pref_registry_simple.h"
#include "components/prefs/pref_service.h"
#include "crypto/random.h"
std::vector<uint8_t> MediaStorageIdSalt::GetSalt(PrefService* pref_service) {
// Salt is stored as hex-encoded string.
std::string encoded_salt =
pref_service->GetString(prefs::kMediaStorageIdSalt);
std::vector<uint8_t> salt;
if (encoded_salt.length() != kSaltLength * 2 ||
!base::HexStringToBytes(encoded_salt, &salt)) {
// If the salt is not the proper format log an error.
if (encoded_salt.length() > 0) {
DLOG(ERROR) << "Saved value for " << prefs::kMediaStorageIdSalt
<< " is not valid: " << encoded_salt;
// Continue on to generate a new one.
}
// If the salt doesn't exist, generate a new one.
salt = crypto::RandBytesAsVector(kSaltLength);
encoded_salt = base::HexEncode(salt);
pref_service->SetString(prefs::kMediaStorageIdSalt, encoded_salt);
}
return salt;
}
void MediaStorageIdSalt::RegisterProfilePrefs(PrefRegistrySimple* registry) {
registry->RegisterStringPref(prefs::kMediaStorageIdSalt, std::string());
}
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