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1 // Copyright (c) 2008 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2008 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "base/rand_util.h" | 5 #include "base/rand_util.h" |
6 #include "base/rand_util_c.h" | 6 #include "base/rand_util_c.h" |
7 | 7 |
8 #include <errno.h> | 8 #include <errno.h> |
9 #include <fcntl.h> | 9 #include <fcntl.h> |
10 #include <unistd.h> | 10 #include <unistd.h> |
11 | 11 |
12 #include "base/file_util.h" | 12 #include "base/file_util.h" |
13 #include "base/lazy_instance.h" | 13 #include "base/lazy_instance.h" |
14 #include "base/logging.h" | 14 #include "base/logging.h" |
15 #include "base/stringprintf.h" | |
16 | 15 |
17 namespace { | 16 namespace { |
18 | 17 |
19 // We keep the file descriptor for /dev/urandom around so we don't need to | 18 // We keep the file descriptor for /dev/urandom around so we don't need to |
20 // reopen it (which is expensive), and since we may not even be able to reopen | 19 // reopen it (which is expensive), and since we may not even be able to reopen |
21 // it if we are later put in a sandbox. This class wraps the file descriptor so | 20 // it if we are later put in a sandbox. This class wraps the file descriptor so |
22 // we can use LazyInstance to handle opening it on the first access. | 21 // we can use LazyInstance to handle opening it on the first access. |
23 class URandomFd { | 22 class URandomFd { |
24 public: | 23 public: |
25 URandomFd() { | 24 URandomFd() { |
(...skipping 22 matching lines...) Expand all Loading... |
48 | 47 |
49 int urandom_fd = g_urandom_fd.Pointer()->fd(); | 48 int urandom_fd = g_urandom_fd.Pointer()->fd(); |
50 bool success = file_util::ReadFromFD(urandom_fd, | 49 bool success = file_util::ReadFromFD(urandom_fd, |
51 reinterpret_cast<char*>(&number), | 50 reinterpret_cast<char*>(&number), |
52 sizeof(number)); | 51 sizeof(number)); |
53 CHECK(success); | 52 CHECK(success); |
54 | 53 |
55 return number; | 54 return number; |
56 } | 55 } |
57 | 56 |
58 // TODO(cmasone): Once we're comfortable this works, migrate Windows code to | |
59 // use this as well. | |
60 std::string RandomBytesToGUIDString(const uint64 bytes[2]) { | |
61 return StringPrintf("%08X-%04X-%04X-%04X-%012llX", | |
62 static_cast<unsigned int>(bytes[0] >> 32), | |
63 static_cast<unsigned int>((bytes[0] >> 16) & 0x0000ffff), | |
64 static_cast<unsigned int>(bytes[0] & 0x0000ffff), | |
65 static_cast<unsigned int>(bytes[1] >> 48), | |
66 bytes[1] & 0x0000ffffffffffffULL); | |
67 } | |
68 | |
69 std::string GenerateGUID() { | |
70 uint64 sixteen_bytes[2] = { base::RandUint64(), base::RandUint64() }; | |
71 return RandomBytesToGUIDString(sixteen_bytes); | |
72 } | |
73 | |
74 } // namespace base | 57 } // namespace base |
75 | 58 |
76 int GetUrandomFD(void) { | 59 int GetUrandomFD(void) { |
77 return g_urandom_fd.Pointer()->fd(); | 60 return g_urandom_fd.Pointer()->fd(); |
78 } | 61 } |
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