/* $Id: rand.h $ */ /** @file * IPRT - Internal RTRand header */ /* * Copyright (C) 2006-2020 Oracle Corporation * * This file is part of VirtualBox Open Source Edition (OSE), as * available from http://www.virtualbox.org. This file is free software; * you can redistribute it and/or modify it under the terms of the GNU * General Public License (GPL) as published by the Free Software * Foundation, in version 2 as it comes in the "COPYING" file of the * VirtualBox OSE distribution. VirtualBox OSE is distributed in the * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. * * The contents of this file may alternatively be used under the terms * of the Common Development and Distribution License Version 1.0 * (CDDL) only, as it comes in the "COPYING.CDDL" file of the * VirtualBox OSE 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. */ #ifndef IPRT_INCLUDED_INTERNAL_rand_h #define IPRT_INCLUDED_INTERNAL_rand_h #ifndef RT_WITHOUT_PRAGMA_ONCE # pragma once #endif #include #include /** Pointer to a random number generator instance. */ typedef struct RTRANDINT *PRTRANDINT; /** * Random number generator instance. * * @remarks Not sure if it makes sense to have three random getters... */ typedef struct RTRANDINT { /** Magic value (RTRANDINT_MAGIC). */ uint32_t u32Magic; #if 0 /** @todo later. */ /** Fast mutex semaphore that serializes the access, this is optional. */ PRTCRITSECT pCritSect; #endif /** * Generates random bytes. * * @param pThis Pointer to the instance data. * @param pb Where to store the bytes. * @param cb The number of bytes to produce. */ DECLCALLBACKMEMBER(void , pfnGetBytes)(PRTRANDINT pThis, uint8_t *pb, size_t cb); /** * Generates a unsigned 32-bit random number. * * @returns The random number. * @param pThis Pointer to the instance data. * @param u32First The first number in the range. * @param u32Last The last number in the range (i.e. inclusive). */ DECLCALLBACKMEMBER(uint32_t, pfnGetU32)(PRTRANDINT pThis, uint32_t u32First, uint32_t u32Last); /** * Generates a unsigned 64-bit random number. * * @returns The random number. * @param pThis Pointer to the instance data. * @param u64First The first number in the range. * @param u64Last The last number in the range (i.e. inclusive). */ DECLCALLBACKMEMBER(uint64_t, pfnGetU64)(PRTRANDINT pThis, uint64_t u64First, uint64_t u64Last); /** * Generic seeding. * * @returns IPRT status code. * @retval VERR_NOT_SUPPORTED if it isn't a pseudo generator. * * @param pThis Pointer to the instance data. * @param u64Seed The seed. */ DECLCALLBACKMEMBER(int, pfnSeed)(PRTRANDINT pThis, uint64_t u64Seed); /** * Save the current state of a pseudo generator. * * This can be use to save the state so it can later be resumed at the same * position. * * @returns IPRT status code. * @retval VINF_SUCCESS on success. *pcbState contains the length of the * returned string and pszState contains the state string. * @retval VERR_BUFFER_OVERFLOW if the supplied buffer is too small. *pcbState * will contain the necessary buffer size. * @retval VERR_NOT_SUPPORTED by non-psuedo generators. * * @param pThis Pointer to the instance data. * @param pszState Where to store the state. The returned string will be * null terminated and printable. * @param pcbState The size of the buffer pszState points to on input, the * size required / used on return (including the * terminator, thus the 'cb' instead of 'cch'). */ DECLCALLBACKMEMBER(int, pfnSaveState)(PRTRANDINT pThis, char *pszState, size_t *pcbState); /** * Restores the state of a pseudo generator. * * The state must have been obtained using pfnGetState. * * @returns IPRT status code. * @retval VERR_PARSE_ERROR if the state string is malformed. * @retval VERR_NOT_SUPPORTED by non-psuedo generators. * * @param pThis Pointer to the instance data. * @param pszState The state to load. */ DECLCALLBACKMEMBER(int, pfnRestoreState)(PRTRANDINT pThis, char const *pszState); /** * Destroys the instance. * * The callee is responsible for freeing all resources, including * the instance data. * * @returns IPRT status code. State undefined on failure. * @param pThis Pointer to the instance data. */ DECLCALLBACKMEMBER(int, pfnDestroy)(PRTRANDINT pThis); /** Union containing the specific state info for each generator. */ union { struct RTRandParkMiller { /** The context. */ uint32_t u32Ctx; /** The number of single bits used to fill in the 31st bit. */ uint32_t u32Bits; /** The number bits in u32Bits. */ uint32_t cBits; } ParkMiller; struct RTRandFile { /** The file handle (native). */ intptr_t hFile; } File; } u; } RTRANDINT; RT_C_DECLS_BEGIN DECLHIDDEN(DECLCALLBACK(void)) rtRandAdvSynthesizeBytesFromU32(PRTRANDINT pThis, uint8_t *pb, size_t cb); DECLHIDDEN(DECLCALLBACK(void)) rtRandAdvSynthesizeBytesFromU64(PRTRANDINT pThis, uint8_t *pb, size_t cb); DECLHIDDEN(DECLCALLBACK(uint32_t)) rtRandAdvSynthesizeU32FromBytes(PRTRANDINT pThis, uint32_t u32First, uint32_t u32Last); DECLHIDDEN(DECLCALLBACK(uint32_t)) rtRandAdvSynthesizeU32FromU64(PRTRANDINT pThis, uint32_t u32First, uint32_t u32Last); DECLHIDDEN(DECLCALLBACK(uint64_t)) rtRandAdvSynthesizeU64FromBytes(PRTRANDINT pThis, uint64_t u64First, uint64_t u64Last); DECLHIDDEN(DECLCALLBACK(uint64_t)) rtRandAdvSynthesizeU64FromU32(PRTRANDINT pThis, uint64_t u64First, uint64_t u64Last); DECLHIDDEN(DECLCALLBACK(int)) rtRandAdvStubSeed(PRTRANDINT pThis, uint64_t u64Seed); DECLHIDDEN(DECLCALLBACK(int)) rtRandAdvStubSaveState(PRTRANDINT pThis, char *pszState, size_t *pcbState); DECLHIDDEN(DECLCALLBACK(int)) rtRandAdvStubRestoreState(PRTRANDINT pThis, char const *pszState); DECLHIDDEN(DECLCALLBACK(int)) rtRandAdvDefaultDestroy(PRTRANDINT pThis); RT_C_DECLS_END #endif /* !IPRT_INCLUDED_INTERNAL_rand_h */