1 | // |
---|
2 | // RandomStream.cpp |
---|
3 | // |
---|
4 | // $Id: //poco/1.3/Foundation/src/RandomStream.cpp#3 $ |
---|
5 | // |
---|
6 | // Library: Foundation |
---|
7 | // Package: Crypt |
---|
8 | // Module: RandomStream |
---|
9 | // |
---|
10 | // Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH. |
---|
11 | // and Contributors. |
---|
12 | // |
---|
13 | // Permission is hereby granted, free of charge, to any person or organization |
---|
14 | // obtaining a copy of the software and accompanying documentation covered by |
---|
15 | // this license (the "Software") to use, reproduce, display, distribute, |
---|
16 | // execute, and transmit the Software, and to prepare derivative works of the |
---|
17 | // Software, and to permit third-parties to whom the Software is furnished to |
---|
18 | // do so, all subject to the following: |
---|
19 | // |
---|
20 | // The copyright notices in the Software and this entire statement, including |
---|
21 | // the above license grant, this restriction and the following disclaimer, |
---|
22 | // must be included in all copies of the Software, in whole or in part, and |
---|
23 | // all derivative works of the Software, unless such copies or derivative |
---|
24 | // works are solely in the form of machine-executable object code generated by |
---|
25 | // a source language processor. |
---|
26 | // |
---|
27 | // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
---|
28 | // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
---|
29 | // FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT |
---|
30 | // SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE |
---|
31 | // FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE, |
---|
32 | // ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
---|
33 | // DEALINGS IN THE SOFTWARE. |
---|
34 | // |
---|
35 | |
---|
36 | |
---|
37 | #include "Poco/RandomStream.h" |
---|
38 | #include "Poco/Random.h" |
---|
39 | #include "Poco/SHA1Engine.h" |
---|
40 | #if defined(POCO_OS_FAMILY_WINDOWS) |
---|
41 | #include "Poco/UnWindows.h" |
---|
42 | #include <wincrypt.h> |
---|
43 | #elif defined(POCO_OS_FAMILY_UNIX) |
---|
44 | #include <fcntl.h> |
---|
45 | #include <unistd.h> |
---|
46 | #endif |
---|
47 | #include <ctime> |
---|
48 | |
---|
49 | |
---|
50 | namespace Poco { |
---|
51 | |
---|
52 | |
---|
53 | RandomBuf::RandomBuf(): BufferedStreamBuf(256, std::ios::in) |
---|
54 | { |
---|
55 | } |
---|
56 | |
---|
57 | |
---|
58 | RandomBuf::~RandomBuf() |
---|
59 | { |
---|
60 | } |
---|
61 | |
---|
62 | |
---|
63 | int RandomBuf::readFromDevice(char* buffer, std::streamsize length) |
---|
64 | { |
---|
65 | int n = 0; |
---|
66 | |
---|
67 | #if defined(POCO_OS_FAMILY_WINDOWS) |
---|
68 | HCRYPTPROV hProvider = 0; |
---|
69 | CryptAcquireContext(&hProvider, 0, 0, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT); |
---|
70 | CryptGenRandom(hProvider, (DWORD) length, (BYTE*) buffer); |
---|
71 | CryptReleaseContext(hProvider, 0); |
---|
72 | n = static_cast<int>(length); |
---|
73 | #else |
---|
74 | #if defined(POCO_OS_FAMILY_UNIX) |
---|
75 | int fd = open("/dev/urandom", O_RDONLY, 0); |
---|
76 | if (fd >= 0) |
---|
77 | { |
---|
78 | n = read(fd, buffer, length); |
---|
79 | close(fd); |
---|
80 | } |
---|
81 | #endif |
---|
82 | if (n <= 0) |
---|
83 | { |
---|
84 | // x is here as a source of randomness, so it does not make |
---|
85 | // much sense to protect it with a Mutex. |
---|
86 | static UInt32 x = 0; |
---|
87 | Random rnd1(256); |
---|
88 | Random rnd2(64); |
---|
89 | x += rnd1.next(); |
---|
90 | |
---|
91 | n = 0; |
---|
92 | SHA1Engine engine; |
---|
93 | UInt32 t = (UInt32) std::time(NULL); |
---|
94 | engine.update(&t, sizeof(t)); |
---|
95 | void* p = this; |
---|
96 | engine.update(&p, sizeof(p)); |
---|
97 | engine.update(buffer, length); |
---|
98 | UInt32 junk[32]; |
---|
99 | engine.update(junk, sizeof(junk)); |
---|
100 | while (n < length) |
---|
101 | { |
---|
102 | for (int i = 0; i < 100; ++i) |
---|
103 | { |
---|
104 | UInt32 r = rnd2.next(); |
---|
105 | engine.update(&r, sizeof(r)); |
---|
106 | engine.update(&x, sizeof(x)); |
---|
107 | x += rnd1.next(); |
---|
108 | } |
---|
109 | DigestEngine::Digest d = engine.digest(); |
---|
110 | for (DigestEngine::Digest::const_iterator it = d.begin(); it != d.end() && n < length; ++it, ++n) |
---|
111 | { |
---|
112 | engine.update(*it); |
---|
113 | *buffer++ = *it++; |
---|
114 | } |
---|
115 | } |
---|
116 | } |
---|
117 | #endif |
---|
118 | return n; |
---|
119 | } |
---|
120 | |
---|
121 | |
---|
122 | RandomIOS::RandomIOS() |
---|
123 | { |
---|
124 | poco_ios_init(&_buf); |
---|
125 | } |
---|
126 | |
---|
127 | |
---|
128 | RandomIOS::~RandomIOS() |
---|
129 | { |
---|
130 | } |
---|
131 | |
---|
132 | |
---|
133 | RandomBuf* RandomIOS::rdbuf() |
---|
134 | { |
---|
135 | return &_buf; |
---|
136 | } |
---|
137 | |
---|
138 | |
---|
139 | RandomInputStream::RandomInputStream(): std::istream(&_buf) |
---|
140 | { |
---|
141 | } |
---|
142 | |
---|
143 | |
---|
144 | RandomInputStream::~RandomInputStream() |
---|
145 | { |
---|
146 | } |
---|
147 | |
---|
148 | |
---|
149 | } // namespace Poco |
---|