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- /* liboqs.c
- *
- * Copyright (C) 2006-2023 wolfSSL Inc.
- *
- * This file is part of wolfSSL.
- *
- * wolfSSL is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * wolfSSL is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
- */
- /*
- DESCRIPTION
- This library provides the support interfaces to the liboqs library providing
- implementations for Post-Quantum cryptography algorithms.
- */
- #ifdef HAVE_CONFIG_H
- #include <config.h>
- #endif
- #include <wolfssl/wolfcrypt/settings.h>
- #include <wolfssl/wolfcrypt/types.h>
- #include <wolfssl/wolfcrypt/logging.h>
- #include <wolfssl/wolfcrypt/error-crypt.h>
- #include <wolfssl/wolfcrypt/port/liboqs/liboqs.h>
- #if defined(HAVE_LIBOQS)
- /* RNG for liboqs */
- static WC_RNG liboqsDefaultRNG;
- static WC_RNG* liboqsCurrentRNG;
- static wolfSSL_Mutex liboqsRNGMutex;
- static int liboqs_init = 0;
- static void wolfSSL_liboqsGetRandomData(uint8_t* buffer, size_t numOfBytes)
- {
- int ret;
- word32 numOfBytes_word32;
- while (numOfBytes > 0) {
- numOfBytes_word32 = (word32)numOfBytes;
- numOfBytes -= numOfBytes_word32;
- ret = wc_RNG_GenerateBlock(liboqsCurrentRNG, buffer,
- numOfBytes_word32);
- if (ret != 0) {
- /* ToDo: liboqs exits programm if RNG fails,
- * not sure what to do here
- */
- WOLFSSL_MSG_EX(
- "wc_RNG_GenerateBlock(..., %u) failed with ret %d "
- "in wolfSSL_liboqsGetRandomData().", numOfBytes_word32, ret
- );
- abort();
- }
- }
- }
- int wolfSSL_liboqsInit(void)
- {
- int ret = 0;
- if (liboqs_init == 0) {
- ret = wc_InitMutex(&liboqsRNGMutex);
- if (ret != 0) {
- return ret;
- }
- ret = wc_LockMutex(&liboqsRNGMutex);
- if (ret != 0) {
- return ret;
- }
- ret = wc_InitRng(&liboqsDefaultRNG);
- if (ret == 0) {
- OQS_init();
- liboqs_init = 1;
- }
- liboqsCurrentRNG = &liboqsDefaultRNG;
- wc_UnLockMutex(&liboqsRNGMutex);
- OQS_randombytes_custom_algorithm(wolfSSL_liboqsGetRandomData);
- }
- return ret;
- }
- void wolfSSL_liboqsClose(void)
- {
- wc_FreeRng(&liboqsDefaultRNG);
- }
- int wolfSSL_liboqsRngMutexLock(WC_RNG* rng)
- {
- int ret = wolfSSL_liboqsInit();
- if (ret == 0) {
- ret = wc_LockMutex(&liboqsRNGMutex);
- }
- if (ret == 0 && rng != NULL) {
- /* Update the pointer with the RNG to use. This is safe as we locked the mutex */
- liboqsCurrentRNG = rng;
- }
- return ret;
- }
- int wolfSSL_liboqsRngMutexUnlock(void)
- {
- int ret = BAD_MUTEX_E;
- liboqsCurrentRNG = &liboqsDefaultRNG;
- if (liboqs_init) {
- ret = wc_UnLockMutex(&liboqsRNGMutex);
- }
- return ret;
- }
- #endif /* HAVE_LIBOQS */
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