| 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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