Alexandre Lision | ddd731e | 2014-01-31 11:50:08 -0500 | [diff] [blame] | 1 | // Copyright (C) 2010 David Sugar, Tycho Softworks. |
| 2 | // |
| 3 | // This file is part of GNU uCommon C++. |
| 4 | // |
| 5 | // GNU uCommon C++ is free software: you can redistribute it and/or modify |
| 6 | // it under the terms of the GNU Lesser General Public License as published |
| 7 | // by the Free Software Foundation, either version 3 of the License, or |
| 8 | // (at your option) any later version. |
| 9 | // |
| 10 | // GNU uCommon C++ is distributed in the hope that it will be useful, |
| 11 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | // GNU Lesser General Public License for more details. |
| 14 | // |
| 15 | // You should have received a copy of the GNU Lesser General Public License |
| 16 | // along with GNU uCommon C++. If not, see <http://www.gnu.org/licenses/>. |
| 17 | |
| 18 | #include "local.h" |
| 19 | |
| 20 | #ifndef _MSWINDOWS_ |
| 21 | #include <fcntl.h> |
| 22 | #endif |
| 23 | |
| 24 | void Random::seed(void) |
| 25 | { |
| 26 | time_t now; |
| 27 | |
| 28 | time(&now); |
| 29 | srand((int)now); |
| 30 | } |
| 31 | |
| 32 | bool Random::seed(const unsigned char *buf, size_t size) |
| 33 | { |
| 34 | #ifdef _MSWINDOWS_ |
| 35 | return false; |
| 36 | #else |
| 37 | int fd = open("/dev/random", O_WRONLY); |
| 38 | bool result = false; |
| 39 | |
| 40 | if(fd > -1) { |
| 41 | if(write(fd, buf, size) > 0) |
| 42 | result = true; |
| 43 | close(fd); |
| 44 | } |
| 45 | return result; |
| 46 | #endif |
| 47 | } |
| 48 | |
| 49 | size_t Random::key(unsigned char *buf, size_t size) |
| 50 | { |
| 51 | #ifdef _MSWINDOWS_ |
| 52 | if((_handle != (HCRYPTPROV)NULL) && CryptGenRandom(_handle, size, buf)) |
| 53 | return size; |
| 54 | return 0; |
| 55 | #else |
| 56 | int fd = open("/dev/random", O_RDONLY); |
| 57 | ssize_t result = 0; |
| 58 | |
| 59 | if(fd > -1) { |
| 60 | result = read(fd, buf, size); |
| 61 | close(fd); |
| 62 | } |
| 63 | |
| 64 | if(result < 0) |
| 65 | result = 0; |
| 66 | |
| 67 | return (size_t)result; |
| 68 | #endif |
| 69 | } |
| 70 | |
| 71 | size_t Random::fill(unsigned char *buf, size_t size) |
| 72 | { |
| 73 | #ifdef _MSWINDOWS_ |
| 74 | return key(buf, size); |
| 75 | #else |
| 76 | int fd = open("/dev/urandom", O_RDONLY); |
| 77 | ssize_t result = 0; |
| 78 | |
| 79 | if(fd > -1) { |
| 80 | result = read(fd, buf, size); |
| 81 | close(fd); |
| 82 | } |
| 83 | // ugly...would not trust it |
| 84 | else { |
| 85 | result = 0; |
| 86 | while(result++ < (ssize_t)size) |
| 87 | *(buf++) = rand() & 0xff; |
| 88 | } |
| 89 | |
| 90 | if(result < 0) |
| 91 | result = 0; |
| 92 | |
| 93 | return (size_t)result; |
| 94 | #endif |
| 95 | } |
| 96 | |
| 97 | bool Random::status(void) |
| 98 | { |
| 99 | #ifdef _MSWINDOWS_ |
| 100 | return true; |
| 101 | #else |
| 102 | if(fsys::is_file("/dev/random")) |
| 103 | return true; |
| 104 | |
| 105 | return false; |
| 106 | #endif |
| 107 | } |
| 108 | |