diff options
Diffstat (limited to 'src/VBox/Runtime/common/rand/rand.cpp')
| -rw-r--r-- | src/VBox/Runtime/common/rand/rand.cpp | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/src/VBox/Runtime/common/rand/rand.cpp b/src/VBox/Runtime/common/rand/rand.cpp new file mode 100644 index 00000000..ec540157 --- /dev/null +++ b/src/VBox/Runtime/common/rand/rand.cpp @@ -0,0 +1,185 @@ +/* $Id: rand.cpp $ */ +/** @file + * IPRT - Random Numbers. + */ + +/* + * Copyright (C) 2006-2023 Oracle and/or its affiliates. + * + * This file is part of VirtualBox base platform packages, as + * available from https://www.virtualbox.org. + * + * This program 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, in version 3 of the + * License. + * + * This program 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, see <https://www.gnu.org/licenses>. + * + * The contents of this file may alternatively be used under the terms + * of the Common Development and Distribution License Version 1.0 + * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included + * in the VirtualBox distribution, in which case the provisions of the + * CDDL are applicable instead of those of the GPL. + * + * You may elect to license modified versions of this file under the + * terms and conditions of either the GPL or the CDDL or both. + * + * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0 + */ + + +/********************************************************************************************************************************* +* Header Files * +*********************************************************************************************************************************/ +#include <iprt/rand.h> +#include "internal/iprt.h" + +#include <iprt/time.h> +#if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86) +# include <iprt/asm-amd64-x86.h> +#endif +#include <iprt/errcore.h> +#include <iprt/assert.h> +#include <iprt/thread.h> +#include <iprt/once.h> +#include "internal/rand.h" + + +/********************************************************************************************************************************* +* Global Variables * +*********************************************************************************************************************************/ +/** For lazily initializing of the random generator. */ +static RTONCE g_rtRandOnce = RTONCE_INITIALIZER; +/** The default random generator. */ +static RTRAND g_hRand = NIL_RTRAND; + + +/** + * Perform lazy initialization. + * + * @returns IPRT status code. + * @param pvUser Ignored. + */ +static DECLCALLBACK(int) rtRandInitOnce(void *pvUser) +{ + RTRAND hRand; + int rc = RTRandAdvCreateSystemFaster(&hRand); + if (RT_FAILURE(rc)) + rc = RTRandAdvCreateParkMiller(&hRand); + if (RT_SUCCESS(rc)) + { +#if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86) + RTRandAdvSeed(hRand, ASMReadTSC() >> 8); +#else + RTRandAdvSeed(hRand, RTTimeNanoTS() >> 8); +#endif + g_hRand = hRand; + } + else + AssertRC(rc); + + NOREF(pvUser); + return rc; +} + + +/** + * Termination counterpart to rtRandInitOnce. + * + * @param pvUser Ignored. + * @param fLazyCleanUpOk Set if we're terminating the process. + */ +static DECLCALLBACK(void) rtRandTermOnce(void *pvUser, bool fLazyCleanUpOk) +{ + if (!fLazyCleanUpOk) + { + RTRAND hRand = g_hRand; + g_hRand = NIL_RTRAND; + if (hRand != NIL_RTRAND) + { + int rc = RTRandAdvDestroy(hRand); + AssertRC(rc); + } + } + NOREF(pvUser); +} + + +RTDECL(void) RTRandBytes(void *pv, size_t cb) RT_NO_THROW_DEF +{ + RTOnceEx(&g_rtRandOnce, rtRandInitOnce, rtRandTermOnce, NULL); + RTRandAdvBytes(g_hRand, pv, cb); +} +RT_EXPORT_SYMBOL(RTRandBytes); + + +RTDECL(uint32_t) RTRandU32Ex(uint32_t u32First, uint32_t u32Last) RT_NO_THROW_DEF +{ + RTOnceEx(&g_rtRandOnce, rtRandInitOnce, rtRandTermOnce, NULL); + return RTRandAdvU32Ex(g_hRand, u32First, u32Last); +} +RT_EXPORT_SYMBOL(RTRandU32Ex); + + +RTDECL(uint32_t) RTRandU32(void) RT_NO_THROW_DEF +{ + RTOnceEx(&g_rtRandOnce, rtRandInitOnce, rtRandTermOnce, NULL); + return RTRandAdvU32(g_hRand); +} +RT_EXPORT_SYMBOL(RTRandU32); + + +RTDECL(int32_t) RTRandS32Ex(int32_t i32First, int32_t i32Last) RT_NO_THROW_DEF +{ + RTOnceEx(&g_rtRandOnce, rtRandInitOnce, rtRandTermOnce, NULL); + return RTRandAdvS32Ex(g_hRand, i32First, i32Last); +} +RT_EXPORT_SYMBOL(RTRandS32Ex); + + +RTDECL(int32_t) RTRandS32(void) RT_NO_THROW_DEF +{ + RTOnceEx(&g_rtRandOnce, rtRandInitOnce, rtRandTermOnce, NULL); + return RTRandAdvS32(g_hRand); +} +RT_EXPORT_SYMBOL(RTRandS32); + + +RTDECL(uint64_t) RTRandU64Ex(uint64_t u64First, uint64_t u64Last) RT_NO_THROW_DEF +{ + RTOnceEx(&g_rtRandOnce, rtRandInitOnce, rtRandTermOnce, NULL); + return RTRandAdvU64Ex(g_hRand, u64First, u64Last); +} +RT_EXPORT_SYMBOL(RTRandU64Ex); + + +RTDECL(uint64_t) RTRandU64(void) RT_NO_THROW_DEF +{ + RTOnceEx(&g_rtRandOnce, rtRandInitOnce, rtRandTermOnce, NULL); + return RTRandAdvU64(g_hRand); +} +RT_EXPORT_SYMBOL(RTRandU64); + + +RTDECL(int64_t) RTRandS64Ex(int64_t i64First, int64_t i64Last) RT_NO_THROW_DEF +{ + RTOnceEx(&g_rtRandOnce, rtRandInitOnce, rtRandTermOnce, NULL); + return RTRandAdvS64Ex(g_hRand, i64First, i64Last); +} +RT_EXPORT_SYMBOL(RTRandS64Ex); + + +RTDECL(int64_t) RTRandS64(void) RT_NO_THROW_DEF +{ + RTOnceEx(&g_rtRandOnce, rtRandInitOnce, rtRandTermOnce, NULL); + return RTRandAdvS32(g_hRand); +} +RT_EXPORT_SYMBOL(RTRandS64); + |