1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
|
/*
* Copyright (C) 2010 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include <wtf/UUID.h>
#include <mutex>
#include <wtf/ASCIICType.h>
#include <wtf/CryptographicallyRandomNumber.h>
#include <wtf/HexNumber.h>
#include <wtf/Lock.h>
#include <wtf/NeverDestroyed.h>
#include <wtf/SHA1.h>
#include <wtf/WeakRandom.h>
#include <wtf/text/MakeString.h>
#include <wtf/text/StringToIntegerConversion.h>
#if OS(DARWIN)
#include <sys/sysctl.h>
#endif
namespace WTF {
static ALWAYS_INLINE UInt128 convertRandomUInt128ToUUIDVersion4(UInt128 buffer)
{
// By default, we generate a v4 UUID value, as per https://datatracker.ietf.org/doc/html/rfc4122#section-4.4.
auto high = static_cast<uint64_t>((buffer >> 64) & 0xffffffffffff0fff) | 0x4000;
auto low = static_cast<uint64_t>(buffer & 0x3fffffffffffffff) | 0x8000000000000000;
return (static_cast<UInt128>(high) << 64) | low;
}
static UInt128 generateCryptographicallyRandomUUIDVersion4()
{
UInt128 buffer { };
static_assert(sizeof(buffer) == 16);
cryptographicallyRandomValues(asMutableByteSpan(buffer));
return convertRandomUInt128ToUUIDVersion4(buffer);
}
UInt128 UUID::generateWeakRandomUUIDVersion4()
{
static Lock lock;
UInt128 buffer { 0 };
{
Locker locker { lock };
static std::optional<WeakRandom> weakRandom;
if (!weakRandom)
weakRandom.emplace();
buffer = static_cast<UInt128>(weakRandom->getUint64()) << 64 | weakRandom->getUint64();
}
return convertRandomUInt128ToUUIDVersion4(buffer);
}
UUID UUID::createVersion5(const SHA1::Digest& digest)
{
// https://datatracker.ietf.org/doc/html/rfc4122#section-4.3
UInt128 buffer { 0 };
for (unsigned i = 0; i < 16; ++i)
buffer |= (static_cast<UInt128>(digest[i]) << ((16 - 1 - i) * 8));
auto high = static_cast<uint64_t>((buffer >> 64) & 0xffffffffffff0fff) | 0x5000;
auto low = static_cast<uint64_t>(buffer & 0x3fffffffffffffff) | 0x8000000000000000;
return UUID { (static_cast<UInt128>(high) << 64) | low };
}
UUID UUID::createVersion5(UUID namespaceID, std::span<const uint8_t> name)
{
std::array<uint8_t, 16> buffer { };
UInt128 data = namespaceID.data();
for (unsigned i = 0; i < buffer.size(); ++i)
buffer[i] = static_cast<uint8_t>(data >> ((buffer.size() - 1 - i) * 8));
SHA1 sha1;
sha1.addBytes(buffer);
sha1.addBytes(name);
SHA1::Digest digest { };
sha1.computeHash(digest);
return createVersion5(digest);
}
UUID::UUID()
: m_data(generateCryptographicallyRandomUUIDVersion4())
{
}
String UUID::toString() const
{
return makeString(*this);
}
std::optional<UUID> UUID::parse(StringView value)
{
// UUIDs have the form xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx with hexadecimal digits for x.
if (value.length() != 36)
return { };
if (value[8] != '-' || value[13] != '-' || value[18] != '-' || value[23] != '-')
return { };
// parseInteger may accept integers starting with +, let's check this beforehand.
if (value[0] == '+' || value[9] == '+' || value[19] == '+' || value[24] == '+')
return { };
auto firstValue = parseInteger<uint64_t>(value.left(8), 16);
if (!firstValue)
return { };
auto secondValue = parseInteger<uint64_t>(value.substring(9, 4), 16);
if (!secondValue)
return { };
auto thirdValue = parseInteger<uint64_t>(value.substring(14, 4), 16);
if (!thirdValue)
return { };
auto fourthValue = parseInteger<uint64_t>(value.substring(19, 4), 16);
if (!fourthValue)
return { };
auto fifthValue = parseInteger<uint64_t>(value.substring(24, 12), 16);
if (!fifthValue)
return { };
uint64_t high = (*firstValue << 32) | (*secondValue << 16) | *thirdValue;
uint64_t low = (*fourthValue << 48) | *fifthValue;
auto result = (static_cast<UInt128>(high) << 64) | low;
if (result == deletedValue || result == emptyValue)
return { };
return UUID(result);
}
std::optional<UUID> UUID::parseVersion4(StringView value)
{
auto uuid = parse(value);
if (!uuid)
return { };
// Version 4 UUIDs have the form xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx with hexadecimal digits for x and one of 8, 9, A, or B for y.
auto high = static_cast<uint64_t>(uuid->m_data >> 64);
if ((high & 0xf000) != 0x4000)
return { };
auto low = static_cast<uint64_t>(uuid->m_data & 0xffffffffffffffff);
if ((low >> 62) != 2)
return { };
return uuid;
}
String createVersion4UUIDString()
{
return makeString(UUID::createVersion4());
}
String createVersion4UUIDStringWeak()
{
return makeString(UUID::createVersion4Weak());
}
String bootSessionUUIDString()
{
#if OS(DARWIN)
static LazyNeverDestroyed<String> bootSessionUUID;
static std::once_flag onceKey;
std::call_once(onceKey, [] {
constexpr size_t maxUUIDLength = 37;
std::array<char, maxUUIDLength> uuid;
size_t uuidLength = maxUUIDLength;
if (sysctlbyname("kern.bootsessionuuid", uuid.data(), &uuidLength, nullptr, 0))
return;
bootSessionUUID.construct(std::span<const char> { uuid }.first(uuidLength - 1));
});
return bootSessionUUID;
#else
return String();
#endif
}
bool isVersion4UUID(StringView value)
{
return !!UUID::parseVersion4(value);
}
} // namespace WTF
|
