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1 | office | 1 | /** |
2 | * @file BRandom2.c |
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3 | * @author Ambroz Bizjak <ambrop7@gmail.com> |
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4 | * |
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5 | * @section LICENSE |
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6 | * |
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7 | * Redistribution and use in source and binary forms, with or without |
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8 | * modification, are permitted provided that the following conditions are met: |
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9 | * 1. Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * 2. Redistributions in binary form must reproduce the above copyright |
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12 | * notice, this list of conditions and the following disclaimer in the |
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13 | * documentation and/or other materials provided with the distribution. |
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14 | * 3. Neither the name of the author nor the |
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15 | * names of its contributors may be used to endorse or promote products |
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16 | * derived from this software without specific prior written permission. |
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17 | * |
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18 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND |
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19 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
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20 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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21 | * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY |
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22 | * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
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23 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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24 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
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25 | * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
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27 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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28 | */ |
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29 | |||
30 | #include <unistd.h> |
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31 | #include <sys/types.h> |
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32 | #include <sys/stat.h> |
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33 | #include <fcntl.h> |
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34 | |||
35 | #include "BRandom2.h" |
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36 | |||
37 | static int do_init (BRandom2 *o) |
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38 | { |
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39 | if (o->initialized) { |
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40 | return 1; |
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41 | } |
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42 | |||
43 | o->urandom_fd = open("/dev/urandom", O_RDONLY); |
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44 | if (o->urandom_fd < 0) { |
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45 | return 0; |
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46 | } |
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47 | |||
48 | o->initialized = 1; |
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49 | |||
50 | return 1; |
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51 | } |
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52 | |||
53 | int BRandom2_Init (BRandom2 *o, int flags) |
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54 | { |
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55 | ASSERT((flags & ~(BRANDOM2_INIT_LAZY)) == 0) |
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56 | |||
57 | o->initialized = 0; |
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58 | |||
59 | if (!(flags & BRANDOM2_INIT_LAZY) && !do_init(o)) { |
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60 | return 0; |
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61 | } |
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62 | |||
63 | DebugObject_Init(&o->d_obj); |
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64 | return 1; |
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65 | } |
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66 | |||
67 | void BRandom2_Free (BRandom2 *o) |
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68 | { |
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69 | DebugObject_Free(&o->d_obj); |
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70 | |||
71 | if (o->initialized) { |
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72 | close(o->urandom_fd); |
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73 | } |
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74 | } |
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75 | |||
76 | int BRandom2_GenBytes (BRandom2 *o, void *out, size_t len) |
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77 | { |
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78 | DebugObject_Access(&o->d_obj); |
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79 | |||
80 | if (!do_init(o)) { |
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81 | return 0; |
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82 | } |
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83 | |||
84 | ssize_t res = read(o->urandom_fd, out, len); |
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85 | if (res < 0 || res != len) { |
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86 | return 0; |
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87 | } |
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88 | |||
89 | return 1; |
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90 | } |