Diffstat (limited to 'pwmanager/pwmanager/randomizer.cpp') (more/less context) (show whitespace changes)
-rw-r--r-- | pwmanager/pwmanager/randomizer.cpp | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/pwmanager/pwmanager/randomizer.cpp b/pwmanager/pwmanager/randomizer.cpp new file mode 100644 index 0000000..e623f51 --- a/dev/null +++ b/pwmanager/pwmanager/randomizer.cpp | |||
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1 | /*************************************************************************** | ||
2 | * * | ||
3 | * copyright (C) 2003, 2004 by Michael Buesch * | ||
4 | * email: mbuesch@freenet.de * | ||
5 | * * | ||
6 | * This program is free software; you can redistribute it and/or modify * | ||
7 | * it under the terms of the GNU General Public License version 2 * | ||
8 | * as published by the Free Software Foundation. * | ||
9 | * * | ||
10 | ***************************************************************************/ | ||
11 | |||
12 | /*************************************************************************** | ||
13 | * copyright (C) 2004 by Ulf Schenk | ||
14 | * This file is originaly based on version 1.0.1 of pwmanager | ||
15 | * and was modified to run on embedded devices that run microkde | ||
16 | * | ||
17 | * $Id$ | ||
18 | **************************************************************************/ | ||
19 | |||
20 | #include "randomizer.h" | ||
21 | #include "pwmexception.h" | ||
22 | |||
23 | #include <stdlib.h> | ||
24 | #include <time.h> | ||
25 | |||
26 | |||
27 | Randomizer * Randomizer::rndObj (0); | ||
28 | |||
29 | Randomizer::Randomizer() | ||
30 | { | ||
31 | // probe for random devices | ||
32 | rndDev = fopen("/dev/urandom", "r"); | ||
33 | if (rndDev) | ||
34 | return; | ||
35 | rndDev = fopen("/dev/random", "r"); | ||
36 | if (rndDev) | ||
37 | return; | ||
38 | // fall back to rand_r() | ||
39 | seed = time(0); | ||
40 | } | ||
41 | |||
42 | Randomizer::~Randomizer() | ||
43 | { | ||
44 | if (rndDev) { | ||
45 | if (fclose(rndDev)) { | ||
46 | printWarn("failed closing the random-device!"); | ||
47 | } | ||
48 | } | ||
49 | } | ||
50 | |||
51 | char Randomizer::genRndChar() | ||
52 | { | ||
53 | if (rndDev) { | ||
54 | /* we have a rand-device-node */ | ||
55 | return (getc(rndDev)); | ||
56 | } else { | ||
57 | /* we don't have a random-device-node. | ||
58 | * so fall back to rand_r() | ||
59 | */ | ||
60 | return (rand_r(&seed) % 0xFF); | ||
61 | } | ||
62 | } | ||
63 | |||
64 | int Randomizer::genRndInt() | ||
65 | { | ||
66 | if(rndDev) { | ||
67 | int ret; | ||
68 | if (sizeof(int) == 4) { | ||
69 | (reinterpret_cast<char *>(&ret))[0] = getc(rndDev); | ||
70 | (reinterpret_cast<char *>(&ret))[1] = getc(rndDev); | ||
71 | (reinterpret_cast<char *>(&ret))[2] = getc(rndDev); | ||
72 | (reinterpret_cast<char *>(&ret))[3] = getc(rndDev); | ||
73 | } else if (sizeof(int) == 8) { | ||
74 | (reinterpret_cast<char *>(&ret))[0] = getc(rndDev); | ||
75 | (reinterpret_cast<char *>(&ret))[1] = getc(rndDev); | ||
76 | (reinterpret_cast<char *>(&ret))[2] = getc(rndDev); | ||
77 | (reinterpret_cast<char *>(&ret))[3] = getc(rndDev); | ||
78 | (reinterpret_cast<char *>(&ret))[4] = getc(rndDev); | ||
79 | (reinterpret_cast<char *>(&ret))[5] = getc(rndDev); | ||
80 | (reinterpret_cast<char *>(&ret))[6] = getc(rndDev); | ||
81 | (reinterpret_cast<char *>(&ret))[7] = getc(rndDev); | ||
82 | } else { | ||
83 | printWarn(string(__FILE__) + ":" + tostr(__LINE__) | ||
84 | + ": sizeof(int) != 4 && sizeof(int) != 8"); | ||
85 | rndDev = 0; | ||
86 | seed = time(0); | ||
87 | return genRndInt(); | ||
88 | } | ||
89 | return ret; | ||
90 | } else { | ||
91 | return rand_r(&seed); | ||
92 | } | ||
93 | } | ||
94 | |||
95 | unsigned int Randomizer::genRndUInt() | ||
96 | { | ||
97 | if(rndDev) { | ||
98 | unsigned int ret; | ||
99 | if (sizeof(unsigned int) == 4) { | ||
100 | (reinterpret_cast<char *>(&ret))[0] = getc(rndDev); | ||
101 | (reinterpret_cast<char *>(&ret))[1] = getc(rndDev); | ||
102 | (reinterpret_cast<char *>(&ret))[2] = getc(rndDev); | ||
103 | (reinterpret_cast<char *>(&ret))[3] = getc(rndDev); | ||
104 | } else if (sizeof(unsigned int) == 8) { | ||
105 | (reinterpret_cast<char *>(&ret))[0] = getc(rndDev); | ||
106 | (reinterpret_cast<char *>(&ret))[1] = getc(rndDev); | ||
107 | (reinterpret_cast<char *>(&ret))[2] = getc(rndDev); | ||
108 | (reinterpret_cast<char *>(&ret))[3] = getc(rndDev); | ||
109 | (reinterpret_cast<char *>(&ret))[4] = getc(rndDev); | ||
110 | (reinterpret_cast<char *>(&ret))[5] = getc(rndDev); | ||
111 | (reinterpret_cast<char *>(&ret))[6] = getc(rndDev); | ||
112 | (reinterpret_cast<char *>(&ret))[7] = getc(rndDev); | ||
113 | } else { | ||
114 | printWarn(string(__FILE__) + ":" + tostr(__LINE__) | ||
115 | + ": sizeof(unsigned int) != 4 && sizeof(unsigned int) != 8"); | ||
116 | rndDev = 0; | ||
117 | seed = time(0); | ||
118 | return genRndUInt(); | ||
119 | } | ||
120 | return ret; | ||
121 | } else { | ||
122 | return static_cast<unsigned int>(rand_r(&seed)); | ||
123 | } | ||
124 | } | ||