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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 "rlz/lib/machine_id.h"
#include <stddef.h>
#include "rlz/lib/assert.h"
#include "rlz/lib/crc8.h"
#include "rlz/lib/string_utils.h"
// Note: The original machine_id.cc code depends on Chromium's sha1 implementation.
// Using Mozilla's implmentation as replacement to reduce the dependency of
// some external files.
#include "mozilla/SHA1.h"
namespace rlz_lib {
bool GetMachineId(std::string* machine_id) {
if (!machine_id)
return false;
static std::string calculated_id;
static bool calculated = false;
if (calculated) {
*machine_id = calculated_id;
return true;
}
std::vector<uint8_t> sid_bytes;
int volume_id;
if (!GetRawMachineId(&sid_bytes, &volume_id))
return false;
if (!testing::GetMachineIdImpl(sid_bytes, volume_id, machine_id))
return false;
calculated = true;
calculated_id = *machine_id;
return true;
}
namespace testing {
bool GetMachineIdImpl(const std::vector<uint8_t>& sid_bytes,
int volume_id,
std::string* machine_id) {
machine_id->clear();
// The ID should be the SID hash + the Hard Drive SNo. + checksum byte.
static const int kSizeWithoutChecksum = mozilla::SHA1Sum::kHashSize + sizeof(int);
std::vector<unsigned char> id_binary(kSizeWithoutChecksum + 1, 0);
if (!sid_bytes.empty()) {
// In order to be compatible with the old version of RLZ, the hash of the
// SID must be done with all the original bytes from the unicode string.
// However, the chromebase SHA1 hash function takes only an std::string as
// input, so the unicode string needs to be converted to std::string
// "as is".
size_t byte_count = sid_bytes.size() * sizeof(std::vector<uint8_t>::value_type);
const char* buffer = reinterpret_cast<const char*>(sid_bytes.data());
// Note that digest can have embedded nulls.
mozilla::SHA1Sum SHA1;
mozilla::SHA1Sum::Hash hash;
SHA1.update(buffer, byte_count);
SHA1.finish(hash);
std::string digest(reinterpret_cast<char*>(hash), mozilla::SHA1Sum::kHashSize);
VERIFY(digest.size() == mozilla::SHA1Sum::kHashSize);
std::copy(digest.begin(), digest.end(), id_binary.begin());
}
// Convert from int to binary (makes big-endian).
for (size_t i = 0; i < sizeof(int); i++) {
int shift_bits = 8 * (sizeof(int) - i - 1);
id_binary[mozilla::SHA1Sum::kHashSize + i] = static_cast<unsigned char>(
(volume_id >> shift_bits) & 0xFF);
}
// Append the checksum byte.
if (!sid_bytes.empty() || (0 != volume_id))
rlz_lib::Crc8::Generate(id_binary.data(),
kSizeWithoutChecksum,
&id_binary[kSizeWithoutChecksum]);
return rlz_lib::BytesToString(
id_binary.data(), kSizeWithoutChecksum + 1, machine_id);
}
} // namespace testing
} // namespace rlz_lib
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