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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #include "rlz/lib/machine_id.h" | |
6 | |
7 #include "base/sha1.h" | |
8 #include "rlz/lib/assert.h" | |
9 #include "rlz/lib/crc8.h" | |
10 #include "rlz/lib/string_utils.h" | |
11 | |
12 namespace rlz_lib { | |
13 | |
14 bool GetMachineId(std::string* machine_id) { | |
15 if (!machine_id) | |
16 return false; | |
17 | |
18 static std::string calculated_id; | |
19 static bool calculated = false; | |
20 if (calculated) { | |
21 *machine_id = calculated_id; | |
22 return true; | |
23 } | |
24 | |
25 string16 sid_string; | |
26 int volume_id; | |
27 if (!GetRawMachineId(&sid_string, &volume_id)) | |
28 return false; | |
29 | |
30 if (!testing::GetMachineIdImpl(sid_string, volume_id, machine_id)) | |
31 return false; | |
32 | |
33 calculated = true; | |
34 calculated_id = *machine_id; | |
35 return true; | |
36 } | |
37 | |
38 namespace testing { | |
39 | |
40 bool GetMachineIdImpl(const string16& sid_string, | |
41 int volume_id, | |
42 std::string* machine_id) { | |
43 machine_id->clear(); | |
44 | |
45 // The ID should be the SID hash + the Hard Drive SNo. + checksum byte. | |
46 static const int kSizeWithoutChecksum = base::kSHA1Length + sizeof(int); | |
47 std::basic_string<unsigned char> id_binary(kSizeWithoutChecksum + 1, 0); | |
48 | |
49 if (!sid_string.empty()) { | |
50 // In order to be compatible with the old version of RLZ, the hash of the | |
51 // SID must be done with all the original bytes from the unicode string. | |
52 // However, the chromebase SHA1 hash function takes only an std::string as | |
53 // input, so the unicode string needs to be converted to std::string | |
54 // "as is". | |
55 size_t byte_count = sid_string.size() * sizeof(string16::value_type); | |
56 const char* buffer = reinterpret_cast<const char*>(sid_string.c_str()); | |
57 std::string sid_string_buffer(buffer, byte_count); | |
58 | |
59 // Note that digest can have embedded nulls. | |
60 std::string digest(base::SHA1HashString(sid_string_buffer)); | |
61 VERIFY(digest.size() == base::kSHA1Length); | |
62 std::copy(digest.begin(), digest.end(), id_binary.begin()); | |
63 } | |
64 | |
65 // Convert from int to binary (makes big-endian). | |
66 for (size_t i = 0; i < sizeof(int); i++) { | |
67 int shift_bits = 8 * (sizeof(int) - i - 1); | |
68 id_binary[base::kSHA1Length + i] = static_cast<unsigned char>( | |
69 (volume_id >> shift_bits) & 0xFF); | |
70 } | |
71 | |
72 // Append the checksum byte. | |
73 if (!sid_string.empty() || (0 != volume_id)) | |
74 rlz_lib::Crc8::Generate(id_binary.c_str(), | |
75 kSizeWithoutChecksum, | |
76 &id_binary[kSizeWithoutChecksum]); | |
77 | |
78 return rlz_lib::BytesToString( | |
79 id_binary.c_str(), kSizeWithoutChecksum + 1, machine_id); | |
80 } | |
81 | |
82 } // namespace testing | |
83 | |
84 } // namespace rlz_lib | |
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