1 | /*- |
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2 | * Copyright (c) 2016 embedded brains GmbH |
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3 | * All rights reserved. |
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4 | * |
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5 | * Redistribution and use in source and binary forms, with or without |
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6 | * modification, are permitted provided that the following conditions |
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7 | * are met: |
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8 | * 1. Redistributions of source code must retain the above copyright |
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9 | * notice, this list of conditions and the following disclaimer. |
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10 | * 2. Redistributions in binary form must reproduce the above copyright |
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11 | * notice, this list of conditions and the following disclaimer in the |
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12 | * documentation and/or other materials provided with the distribution. |
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13 | * |
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14 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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15 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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16 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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17 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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18 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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19 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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20 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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21 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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22 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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23 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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24 | * SUCH DAMAGE. |
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25 | */ |
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26 | |
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27 | /* |
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28 | * Newlib ports may override the default implementations via the following |
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29 | * define and macros |
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30 | * o _ARC4RANDOM_DATA, |
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31 | * o _ARC4RANDOM_GETENTROPY_FAIL(), |
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32 | * o _ARC4RANDOM_ALLOCATE(rsp, rspx), and |
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33 | * o _ARC4RANDOM_FORKDETECT(). |
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34 | */ |
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35 | #include <machine/_arc4random.h> |
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36 | |
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37 | #include <sys/lock.h> |
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38 | #include <signal.h> |
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39 | |
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40 | #ifndef _ARC4_LOCK_INIT |
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41 | |
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42 | #define _ARC4_LOCK_INIT __LOCK_INIT(static, __arc4random_mutex); |
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43 | |
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44 | #define _ARC4_LOCK() __lock_acquire(__arc4random_mutex) |
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45 | |
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46 | #define _ARC4_UNLOCK() __lock_release(__arc4random_mutex) |
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47 | |
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48 | #endif /* _ARC4_LOCK_INIT */ |
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49 | |
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50 | #ifndef __SINGLE_THREAD__ |
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51 | _ARC4_LOCK_INIT |
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52 | #endif |
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53 | |
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54 | #ifdef _ARC4RANDOM_DATA |
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55 | _ARC4RANDOM_DATA |
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56 | #else |
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57 | static struct { |
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58 | struct _rs rs; |
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59 | struct _rsx rsx; |
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60 | } _arc4random_data; |
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61 | #endif |
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62 | |
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63 | static inline void |
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64 | _getentropy_fail(void) |
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65 | { |
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66 | #ifdef _ARC4RANDOM_GETENTROPY_FAIL |
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67 | _ARC4RANDOM_GETENTROPY_FAIL(); |
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68 | #else |
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69 | raise(SIGKILL); |
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70 | #endif |
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71 | } |
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72 | |
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73 | static inline int |
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74 | _rs_allocate(struct _rs **rsp, struct _rsx **rsxp) |
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75 | { |
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76 | #ifdef _ARC4RANDOM_ALLOCATE |
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77 | _ARC4RANDOM_ALLOCATE(rsp, rsxp); |
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78 | #else |
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79 | *rsp = &_arc4random_data.rs; |
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80 | *rsxp = &_arc4random_data.rsx; |
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81 | return (0); |
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82 | #endif |
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83 | } |
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84 | |
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85 | static inline void |
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86 | _rs_forkdetect(void) |
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87 | { |
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88 | #ifdef _ARC4RANDOM_FORKDETECT |
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89 | _ARC4RANDOM_FORKDETECT(); |
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90 | #endif |
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91 | } |
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