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/* $Id: rand.h $ */
/** @file
* IPRT - Internal RTRand header
*/
/*
* Copyright (C) 2006-2019 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 <iprt/types.h>
#include <iprt/critsect.h>
/** 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 */
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