330 lines
10 KiB
C
330 lines
10 KiB
C
/** @file
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* IPRT - Random Numbers and Byte Streams.
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*/
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/*
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* Copyright (C) 2006-2023 Oracle and/or its affiliates.
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*
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* This file is part of VirtualBox base platform packages, as
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* available from https://www.virtualbox.org.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, in version 3 of the
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* License.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <https://www.gnu.org/licenses>.
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*
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* The contents of this file may alternatively be used under the terms
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* of the Common Development and Distribution License Version 1.0
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* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
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* in the VirtualBox distribution, in which case the provisions of the
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* CDDL are applicable instead of those of the GPL.
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*
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* You may elect to license modified versions of this file under the
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* terms and conditions of either the GPL or the CDDL or both.
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*
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* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
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*/
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#ifndef IPRT_INCLUDED_rand_h
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#define IPRT_INCLUDED_rand_h
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#ifndef RT_WITHOUT_PRAGMA_ONCE
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# pragma once
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#endif
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#include <iprt/cdefs.h>
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#include <iprt/types.h>
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RT_C_DECLS_BEGIN
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/** @defgroup grp_rt_rand RTRand - Random Numbers and Byte Streams
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* @ingroup grp_rt
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* @{
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*/
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/**
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* Fills a buffer with random bytes.
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*
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* @param pv Where to store the random bytes.
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* @param cb Number of bytes to generate.
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*/
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RTDECL(void) RTRandBytes(void *pv, size_t cb) RT_NO_THROW_PROTO;
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/**
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* Generate a 32-bit signed random number in the set [i32First..i32Last].
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*
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* @returns The random number.
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* @param i32First First number in the set.
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* @param i32Last Last number in the set.
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*/
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RTDECL(int32_t) RTRandS32Ex(int32_t i32First, int32_t i32Last) RT_NO_THROW_PROTO;
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/**
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* Generate a 32-bit signed random number.
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*
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* @returns The random number.
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*/
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RTDECL(int32_t) RTRandS32(void) RT_NO_THROW_PROTO;
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/**
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* Generate a 32-bit unsigned random number in the set [u32First..u32Last].
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*
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* @returns The random number.
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* @param u32First First number in the set.
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* @param u32Last Last number in the set.
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*/
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RTDECL(uint32_t) RTRandU32Ex(uint32_t u32First, uint32_t u32Last) RT_NO_THROW_PROTO;
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/**
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* Generate a 32-bit unsigned random number.
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*
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* @returns The random number.
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*/
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RTDECL(uint32_t) RTRandU32(void) RT_NO_THROW_PROTO;
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/**
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* Generate a 64-bit signed random number in the set [i64First..i64Last].
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*
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* @returns The random number.
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* @param i64First First number in the set.
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* @param i64Last Last number in the set.
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*/
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RTDECL(int64_t) RTRandS64Ex(int64_t i64First, int64_t i64Last) RT_NO_THROW_PROTO;
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/**
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* Generate a 64-bit signed random number.
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*
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* @returns The random number.
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*/
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RTDECL(int64_t) RTRandS64(void) RT_NO_THROW_PROTO;
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/**
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* Generate a 64-bit unsigned random number in the set [u64First..u64Last].
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*
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* @returns The random number.
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* @param u64First First number in the set.
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* @param u64Last Last number in the set.
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*/
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RTDECL(uint64_t) RTRandU64Ex(uint64_t u64First, uint64_t u64Last) RT_NO_THROW_PROTO;
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/**
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* Generate a 64-bit unsigned random number.
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*
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* @returns The random number.
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*/
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RTDECL(uint64_t) RTRandU64(void) RT_NO_THROW_PROTO;
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/**
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* Create an instance of the default random number generator.
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*
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* @returns IPRT status code.
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* @param phRand Where to return the handle to the new random number
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* generator.
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*/
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RTDECL(int) RTRandAdvCreate(PRTRAND phRand) RT_NO_THROW_PROTO;
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/**
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* Create an instance of the default pseudo random number generator.
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*
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* @returns IPRT status code.
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* @param phRand Where to store the handle to the generator.
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*/
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RTDECL(int) RTRandAdvCreatePseudo(PRTRAND phRand) RT_NO_THROW_PROTO;
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/**
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* Create an instance of the Park-Miller pseudo random number generator.
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*
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* @returns IPRT status code.
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* @param phRand Where to store the handle to the generator.
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*/
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RTDECL(int) RTRandAdvCreateParkMiller(PRTRAND phRand) RT_NO_THROW_PROTO;
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/**
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* Create an instance of the faster random number generator for the OS.
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*
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* @returns IPRT status code.
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* @retval VERR_NOT_SUPPORTED on platforms which doesn't have this feature.
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* @retval VERR_FILE_NOT_FOUND on system where the random generator hasn't
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* been installed or configured correctly.
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* @retval VERR_PATH_NOT_FOUND for the same reasons as VERR_FILE_NOT_FOUND.
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*
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* @param phRand Where to store the handle to the generator.
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*
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* @remarks Think /dev/urandom.
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*/
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RTDECL(int) RTRandAdvCreateSystemFaster(PRTRAND phRand) RT_NO_THROW_PROTO;
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/**
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* Create an instance of the truer random number generator for the OS.
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*
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* Don't use this unless you seriously need good random numbers because most
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* systems will have will have problems producing sufficient entropy for this
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* and you'll end up blocking while it accumulates.
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*
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* @returns IPRT status code.
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* @retval VERR_NOT_SUPPORTED on platforms which doesn't have this feature.
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* @retval VERR_FILE_NOT_FOUND on system where the random generator hasn't
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* been installed or configured correctly.
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* @retval VERR_PATH_NOT_FOUND for the same reasons as VERR_FILE_NOT_FOUND.
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*
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* @param phRand Where to store the handle to the generator.
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*
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* @remarks Think /dev/random.
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*/
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RTDECL(int) RTRandAdvCreateSystemTruer(PRTRAND phRand) RT_NO_THROW_PROTO;
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/**
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* Destroys a random number generator.
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*
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* @returns IPRT status code.
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* @param hRand Handle to the random number generator.
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*/
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RTDECL(int) RTRandAdvDestroy(RTRAND hRand) RT_NO_THROW_PROTO;
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/**
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* Generic method for seeding of a random number generator.
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*
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* The different generators may have specialized methods for
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* seeding, use one of those if you desire better control
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* over the result.
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*
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* @returns IPRT status code.
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* @retval VERR_NOT_SUPPORTED if it isn't a pseudo generator.
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*
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* @param hRand Handle to the random number generator.
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* @param u64Seed Seed.
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*/
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RTDECL(int) RTRandAdvSeed(RTRAND hRand, uint64_t u64Seed) RT_NO_THROW_PROTO;
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/**
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* Save the current state of a pseudo generator.
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*
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* This can be use to save the state so it can later be resumed at the same
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* position.
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*
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* @returns IPRT status code.
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* @retval VINF_SUCCESS on success. *pcbState contains the length of the
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* returned string and pszState contains the state string.
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* @retval VERR_BUFFER_OVERFLOW if the supplied buffer is too small. *pcbState
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* will contain the necessary buffer size.
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* @retval VERR_NOT_SUPPORTED by non-psuedo generators.
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*
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* @param hRand Handle to the random number generator.
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* @param pszState Where to store the state. The returned string will be
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* null terminated and printable.
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* @param pcbState The size of the buffer pszState points to on input, the
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* size required / used on return (including the
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* terminator, thus the 'cb' instead of 'cch').
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*/
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RTDECL(int) RTRandAdvSaveState(RTRAND hRand, char *pszState, size_t *pcbState) RT_NO_THROW_PROTO;
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/**
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* Restores the state of a pseudo generator.
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*
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* The state must have been obtained using RTRandAdvGetState.
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*
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* @returns IPRT status code.
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* @retval VERR_PARSE_ERROR if the state string is malformed.
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* @retval VERR_NOT_SUPPORTED by non-psuedo generators.
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*
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* @param hRand Handle to the random number generator.
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* @param pszState The state to load.
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*/
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RTDECL(int) RTRandAdvRestoreState(RTRAND hRand, char const *pszState) RT_NO_THROW_PROTO;
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/**
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* Fills a buffer with random bytes.
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*
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* @param hRand Handle to the random number generator.
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* @param pv Where to store the random bytes.
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* @param cb Number of bytes to generate.
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*/
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RTDECL(void) RTRandAdvBytes(RTRAND hRand, void *pv, size_t cb) RT_NO_THROW_PROTO;
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/**
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* Generate a 32-bit signed random number in the set [i32First..i32Last].
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*
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* @returns The random number.
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* @param hRand Handle to the random number generator.
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* @param i32First First number in the set.
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* @param i32Last Last number in the set.
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*/
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RTDECL(int32_t) RTRandAdvS32Ex(RTRAND hRand, int32_t i32First, int32_t i32Last) RT_NO_THROW_PROTO;
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/**
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* Generate a 32-bit signed random number.
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*
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* @returns The random number.
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* @param hRand Handle to the random number generator.
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*/
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RTDECL(int32_t) RTRandAdvS32(RTRAND hRand) RT_NO_THROW_PROTO;
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/**
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* Generate a 32-bit unsigned random number in the set [u32First..u32Last].
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*
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* @returns The random number.
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* @param hRand Handle to the random number generator.
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* @param u32First First number in the set.
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* @param u32Last Last number in the set.
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*/
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RTDECL(uint32_t) RTRandAdvU32Ex(RTRAND hRand, uint32_t u32First, uint32_t u32Last) RT_NO_THROW_PROTO;
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/**
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* Generate a 32-bit unsigned random number.
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*
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* @returns The random number.
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* @param hRand Handle to the random number generator.
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*/
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RTDECL(uint32_t) RTRandAdvU32(RTRAND hRand) RT_NO_THROW_PROTO;
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/**
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* Generate a 64-bit signed random number in the set [i64First..i64Last].
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*
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* @returns The random number.
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* @param hRand Handle to the random number generator.
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* @param i64First First number in the set.
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* @param i64Last Last number in the set.
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*/
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RTDECL(int64_t) RTRandAdvS64Ex(RTRAND hRand, int64_t i64First, int64_t i64Last) RT_NO_THROW_PROTO;
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/**
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* Generate a 64-bit signed random number.
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*
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* @returns The random number.
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*/
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RTDECL(int64_t) RTRandAdvS64(RTRAND hRand) RT_NO_THROW_PROTO;
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/**
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* Generate a 64-bit unsigned random number in the set [u64First..u64Last].
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*
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* @returns The random number.
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* @param hRand Handle to the random number generator.
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* @param u64First First number in the set.
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* @param u64Last Last number in the set.
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*/
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RTDECL(uint64_t) RTRandAdvU64Ex(RTRAND hRand, uint64_t u64First, uint64_t u64Last) RT_NO_THROW_PROTO;
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/**
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* Generate a 64-bit unsigned random number.
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*
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* @returns The random number.
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* @param hRand Handle to the random number generator.
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*/
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RTDECL(uint64_t) RTRandAdvU64(RTRAND hRand) RT_NO_THROW_PROTO;
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/** @} */
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RT_C_DECLS_END
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#endif /* !IPRT_INCLUDED_rand_h */
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