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| 1 | +/* liboqs.c |
| 2 | + * |
| 3 | + * Copyright (C) 2006-2023 wolfSSL Inc. |
| 4 | + * |
| 5 | + * This file is part of wolfSSL. |
| 6 | + * |
| 7 | + * wolfSSL is free software; you can redistribute it and/or modify |
| 8 | + * it under the terms of the GNU General Public License as published by |
| 9 | + * the Free Software Foundation; either version 2 of the License, or |
| 10 | + * (at your option) any later version. |
| 11 | + * |
| 12 | + * wolfSSL is distributed in the hope that it will be useful, |
| 13 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | + * GNU General Public License for more details. |
| 16 | + * |
| 17 | + * You should have received a copy of the GNU General Public License |
| 18 | + * along with this program; if not, write to the Free Software |
| 19 | + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA |
| 20 | + */ |
| 21 | + |
| 22 | +/* |
| 23 | +
|
| 24 | +DESCRIPTION |
| 25 | +This library provides the support interfaces to the liboqs library providing |
| 26 | +implementations for Post-Quantum cryptography algorithms. |
| 27 | +
|
| 28 | +*/ |
| 29 | + |
| 30 | +#ifdef HAVE_CONFIG_H |
| 31 | + #include <config.h> |
| 32 | +#endif |
| 33 | + |
| 34 | +#include <wolfssl/wolfcrypt/settings.h> |
| 35 | +#include <wolfssl/wolfcrypt/types.h> |
| 36 | +#include <wolfssl/wolfcrypt/error-crypt.h> |
| 37 | + |
| 38 | +#include <wolfssl/wolfcrypt/port/liboqs/liboqs.h> |
| 39 | + |
| 40 | +#if defined(HAVE_LIBOQS) |
| 41 | + |
| 42 | +/* RNG for liboqs */ |
| 43 | +static WC_RNG liboqsDefaultRNG; |
| 44 | +static WC_RNG* liboqsCurrentRNG; |
| 45 | + |
| 46 | +static wolfSSL_Mutex liboqsRNGMutex; |
| 47 | + |
| 48 | +static int liboqs_init = 0; |
| 49 | + |
| 50 | + |
| 51 | +static void wolfSSL_liboqsGetRandomData(uint8_t* buffer, size_t numOfBytes) |
| 52 | +{ |
| 53 | + int ret = wc_RNG_GenerateBlock(liboqsCurrentRNG, buffer, numOfBytes); |
| 54 | + if (ret != 0) { |
| 55 | + // ToDo: liboqs exits programm if RNG fails, not sure what to do here |
| 56 | + } |
| 57 | +} |
| 58 | + |
| 59 | +int wolfSSL_liboqsInit(void) |
| 60 | +{ |
| 61 | + int ret = 0; |
| 62 | + |
| 63 | + if (liboqs_init == 0) { |
| 64 | + ret = wc_InitMutex(&liboqsRNGMutex); |
| 65 | + if (ret != 0) { |
| 66 | + return ret; |
| 67 | + } |
| 68 | + ret = wc_LockMutex(&liboqsRNGMutex); |
| 69 | + if (ret != 0) { |
| 70 | + return ret; |
| 71 | + } |
| 72 | + ret = wc_InitRng(&liboqsDefaultRNG); |
| 73 | + if (ret == 0) { |
| 74 | + OQS_init(); |
| 75 | + liboqs_init = 1; |
| 76 | + } |
| 77 | + liboqsCurrentRNG = &liboqsDefaultRNG; |
| 78 | + wc_UnLockMutex(&liboqsRNGMutex); |
| 79 | + |
| 80 | + OQS_randombytes_custom_algorithm(wolfSSL_liboqsGetRandomData); |
| 81 | + } |
| 82 | + |
| 83 | + return ret; |
| 84 | +} |
| 85 | + |
| 86 | +int wolfSSL_liboqsRngMutexLock(WC_RNG* rng) |
| 87 | +{ |
| 88 | + int ret = wolfSSL_liboqsInit(); |
| 89 | + if (ret == 0) { |
| 90 | + ret = wc_LockMutex(&liboqsRNGMutex); |
| 91 | + } |
| 92 | + if (ret == 0 && rng != NULL) { |
| 93 | + /* Update the pointer with the RNG to use. This is safe as we locked the mutex */ |
| 94 | + liboqsCurrentRNG = rng; |
| 95 | + } |
| 96 | + return ret; |
| 97 | +} |
| 98 | + |
| 99 | +int wolfSSL_liboqsRngMutexUnlock(void) |
| 100 | +{ |
| 101 | + int ret = BAD_MUTEX_E; |
| 102 | + |
| 103 | + liboqsCurrentRNG = &liboqsDefaultRNG; |
| 104 | + |
| 105 | + if (liboqs_init) { |
| 106 | + ret = wc_UnLockMutex(&liboqsRNGMutex); |
| 107 | + } |
| 108 | + return ret; |
| 109 | +} |
| 110 | + |
| 111 | +#endif /* HAVE_LIBOQS */ |
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