393609f3f7
Change-Id: I03de46fb6c095bb176fd25fc5f803be6d2d89bcf
328 lines
9.3 KiB
C++
328 lines
9.3 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
|
|
/*
|
|
* This file is part of the LibreOffice project.
|
|
*
|
|
* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
|
|
*
|
|
* This file incorporates work covered by the following license notice:
|
|
*
|
|
* Licensed to the Apache Software Foundation (ASF) under one or more
|
|
* contributor license agreements. See the NOTICE file distributed
|
|
* with this work for additional information regarding copyright
|
|
* ownership. The ASF licenses this file to you under the Apache
|
|
* License, Version 2.0 (the "License"); you may not use this file
|
|
* except in compliance with the License. You may obtain a copy of
|
|
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
|
|
*/
|
|
|
|
#include <sal/types.h>
|
|
#include <osl/thread.h>
|
|
#include <osl/time.h>
|
|
#include <rtl/alloc.h>
|
|
#include <rtl/digest.h>
|
|
#include <rtl/random.h>
|
|
|
|
/*========================================================================
|
|
*
|
|
* rtlRandom internals.
|
|
*
|
|
*======================================================================*/
|
|
#define RTL_RANDOM_RNG_1(a) ((a) * 16807L)
|
|
#define RTL_RANDOM_RNG_2(a) ((a) * 65539L)
|
|
|
|
#define RTL_RANDOM_RNG(x, y, z) \
|
|
{ \
|
|
(x) = 170 * ((x) % 178) - 63 * ((x) / 178); \
|
|
if ((x) < 0) (x) += 30328L; \
|
|
\
|
|
(y) = 171 * ((y) % 177) - 2 * ((y) / 177); \
|
|
if ((y) < 0) (y) += 30269L; \
|
|
\
|
|
(z) = 172 * ((z) % 176) - 35 * ((z) / 176); \
|
|
if ((z) < 0) (z) += 30307L; \
|
|
}
|
|
|
|
/** RandomData_Impl.
|
|
*/
|
|
struct RandomData_Impl
|
|
{
|
|
sal_Int16 m_nX;
|
|
sal_Int16 m_nY;
|
|
sal_Int16 m_nZ;
|
|
};
|
|
|
|
/** __rtl_random_data.
|
|
*/
|
|
static double __rtl_random_data (RandomData_Impl *pImpl);
|
|
|
|
/** RandomPool_Impl.
|
|
*/
|
|
#define RTL_RANDOM_DIGEST rtl_Digest_AlgorithmMD5
|
|
#define RTL_RANDOM_SIZE_DIGEST RTL_DIGEST_LENGTH_MD5
|
|
#define RTL_RANDOM_SIZE_POOL 1023
|
|
|
|
struct RandomPool_Impl
|
|
{
|
|
rtlDigest m_hDigest;
|
|
sal_uInt8 m_pDigest[RTL_RANDOM_SIZE_DIGEST];
|
|
sal_uInt8 m_pData[RTL_RANDOM_SIZE_POOL + 1];
|
|
sal_uInt32 m_nData;
|
|
sal_uInt32 m_nIndex;
|
|
sal_uInt32 m_nCount;
|
|
};
|
|
|
|
/** __rtl_random_initPool.
|
|
*/
|
|
static sal_Bool __rtl_random_initPool (
|
|
RandomPool_Impl *pImpl);
|
|
|
|
/** __rtl_random_seedPool.
|
|
*/
|
|
static void __rtl_random_seedPool (
|
|
RandomPool_Impl *pImpl, const sal_uInt8 *pBuffer, sal_Size nBufLen);
|
|
|
|
/** __rtl_random_readPool.
|
|
*/
|
|
static void __rtl_random_readPool (
|
|
RandomPool_Impl *pImpl, sal_uInt8 *pBuffer, sal_Size nBufLen);
|
|
|
|
/*
|
|
* __rtl_random_data.
|
|
*/
|
|
static double __rtl_random_data (RandomData_Impl *pImpl)
|
|
{
|
|
double random;
|
|
|
|
RTL_RANDOM_RNG (pImpl->m_nX, pImpl->m_nY, pImpl->m_nZ);
|
|
random = (((double)(pImpl->m_nX) / 30328.0) +
|
|
((double)(pImpl->m_nY) / 30269.0) +
|
|
((double)(pImpl->m_nZ) / 30307.0) );
|
|
|
|
random -= ((double)((sal_uInt32)(random)));
|
|
return (random);
|
|
}
|
|
|
|
/*
|
|
* __rtl_random_initPool.
|
|
*/
|
|
static sal_Bool __rtl_random_initPool (RandomPool_Impl *pImpl)
|
|
{
|
|
pImpl->m_hDigest = rtl_digest_create (RTL_RANDOM_DIGEST);
|
|
if (pImpl->m_hDigest)
|
|
{
|
|
oslThreadIdentifier id;
|
|
TimeValue tv;
|
|
RandomData_Impl rd;
|
|
double seed;
|
|
|
|
/* The use of uninitialized stack variables as a way to
|
|
* enhance the entropy of the random pool triggers
|
|
* memory checkers like purify and valgrind.
|
|
*/
|
|
|
|
/*
|
|
__rtl_random_seedPool (pImpl, (sal_uInt8*)&id, sizeof(id));
|
|
__rtl_random_seedPool (pImpl, (sal_uInt8*)&tv, sizeof(tv));
|
|
__rtl_random_seedPool (pImpl, (sal_uInt8*)&rd, sizeof(rd));
|
|
*/
|
|
|
|
id = osl_getThreadIdentifier (NULL);
|
|
id = RTL_RANDOM_RNG_2(RTL_RANDOM_RNG_1(id));
|
|
__rtl_random_seedPool (pImpl, (sal_uInt8*)&id, sizeof(id));
|
|
|
|
osl_getSystemTime (&tv);
|
|
tv.Seconds = RTL_RANDOM_RNG_2(tv.Seconds);
|
|
tv.Nanosec = RTL_RANDOM_RNG_2(tv.Nanosec);
|
|
__rtl_random_seedPool (pImpl, (sal_uInt8*)&tv, sizeof(tv));
|
|
|
|
rd.m_nX = (sal_Int16)(((id >> 1) << 1) + 1);
|
|
rd.m_nY = (sal_Int16)(((tv.Seconds >> 1) << 1) + 1);
|
|
rd.m_nZ = (sal_Int16)(((tv.Nanosec >> 1) << 1) + 1);
|
|
__rtl_random_seedPool (pImpl, (sal_uInt8*)&rd, sizeof(rd));
|
|
|
|
while (pImpl->m_nData < RTL_RANDOM_SIZE_POOL)
|
|
{
|
|
seed = __rtl_random_data (&rd);
|
|
__rtl_random_seedPool (pImpl, (sal_uInt8*)&seed, sizeof(seed));
|
|
}
|
|
return sal_True;
|
|
}
|
|
return sal_False;
|
|
}
|
|
|
|
/*
|
|
* __rtl_random_seedPool.
|
|
*/
|
|
static void __rtl_random_seedPool (
|
|
RandomPool_Impl *pImpl, const sal_uInt8 *pBuffer, sal_Size nBufLen)
|
|
{
|
|
sal_Size i;
|
|
sal_sSize j, k;
|
|
|
|
for (i = 0; i < nBufLen; i += RTL_RANDOM_SIZE_DIGEST)
|
|
{
|
|
j = nBufLen - i;
|
|
if (j > RTL_RANDOM_SIZE_DIGEST)
|
|
j = RTL_RANDOM_SIZE_DIGEST;
|
|
|
|
rtl_digest_update (
|
|
pImpl->m_hDigest, pImpl->m_pDigest, RTL_RANDOM_SIZE_DIGEST);
|
|
|
|
k = (pImpl->m_nIndex + j) - RTL_RANDOM_SIZE_POOL;
|
|
if (k > 0)
|
|
{
|
|
rtl_digest_update (
|
|
pImpl->m_hDigest, &(pImpl->m_pData[pImpl->m_nIndex]), j - k);
|
|
rtl_digest_update (
|
|
pImpl->m_hDigest, &(pImpl->m_pData[0]), k);
|
|
}
|
|
else
|
|
{
|
|
rtl_digest_update (
|
|
pImpl->m_hDigest, &(pImpl->m_pData[pImpl->m_nIndex]), j);
|
|
}
|
|
|
|
rtl_digest_update (pImpl->m_hDigest, pBuffer, j);
|
|
pBuffer += j;
|
|
|
|
rtl_digest_get (
|
|
pImpl->m_hDigest, pImpl->m_pDigest, RTL_RANDOM_SIZE_DIGEST);
|
|
for (k = 0; k < j; k++)
|
|
{
|
|
pImpl->m_pData[pImpl->m_nIndex++] ^= pImpl->m_pDigest[k];
|
|
if (pImpl->m_nIndex >= RTL_RANDOM_SIZE_POOL)
|
|
{
|
|
pImpl->m_nData = RTL_RANDOM_SIZE_POOL;
|
|
pImpl->m_nIndex = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (pImpl->m_nIndex > pImpl->m_nData)
|
|
pImpl->m_nData = pImpl->m_nIndex;
|
|
}
|
|
|
|
/*
|
|
* __rtl_random_readPool.
|
|
*/
|
|
static void __rtl_random_readPool (
|
|
RandomPool_Impl *pImpl, sal_uInt8 *pBuffer, sal_Size nBufLen)
|
|
{
|
|
sal_Int32 j, k;
|
|
|
|
while (nBufLen > 0)
|
|
{
|
|
j = nBufLen;
|
|
if (j > RTL_RANDOM_SIZE_DIGEST/2)
|
|
j = RTL_RANDOM_SIZE_DIGEST/2;
|
|
nBufLen -= j;
|
|
|
|
rtl_digest_update (
|
|
pImpl->m_hDigest,
|
|
&(pImpl->m_pDigest[RTL_RANDOM_SIZE_DIGEST/2]),
|
|
RTL_RANDOM_SIZE_DIGEST/2);
|
|
|
|
k = (pImpl->m_nIndex + j) - pImpl->m_nData;
|
|
if (k > 0)
|
|
{
|
|
rtl_digest_update (
|
|
pImpl->m_hDigest, &(pImpl->m_pData[pImpl->m_nIndex]), j - k);
|
|
rtl_digest_update (
|
|
pImpl->m_hDigest, &(pImpl->m_pData[0]), k);
|
|
}
|
|
else
|
|
{
|
|
rtl_digest_update (
|
|
pImpl->m_hDigest, &(pImpl->m_pData[pImpl->m_nIndex]), j);
|
|
}
|
|
|
|
rtl_digest_get (
|
|
pImpl->m_hDigest, pImpl->m_pDigest, RTL_RANDOM_SIZE_DIGEST);
|
|
for (k = 0; k < j; k++)
|
|
{
|
|
if (pImpl->m_nIndex >= pImpl->m_nData) pImpl->m_nIndex = 0;
|
|
pImpl->m_pData[pImpl->m_nIndex++] ^= pImpl->m_pDigest[k];
|
|
*pBuffer++ = pImpl->m_pDigest[k + RTL_RANDOM_SIZE_DIGEST/2];
|
|
}
|
|
}
|
|
|
|
pImpl->m_nCount++;
|
|
rtl_digest_update (
|
|
pImpl->m_hDigest, &(pImpl->m_nCount), sizeof(pImpl->m_nCount));
|
|
rtl_digest_update (
|
|
pImpl->m_hDigest, pImpl->m_pDigest, RTL_RANDOM_SIZE_DIGEST);
|
|
rtl_digest_get (
|
|
pImpl->m_hDigest, pImpl->m_pDigest, RTL_RANDOM_SIZE_DIGEST);
|
|
}
|
|
|
|
/*========================================================================
|
|
*
|
|
* rtlRandom implementation.
|
|
*
|
|
*======================================================================*/
|
|
/*
|
|
* rtl_random_createPool.
|
|
*/
|
|
rtlRandomPool SAL_CALL rtl_random_createPool() SAL_THROW_EXTERN_C()
|
|
{
|
|
RandomPool_Impl *pImpl = (RandomPool_Impl*)NULL;
|
|
pImpl = (RandomPool_Impl*)rtl_allocateZeroMemory (sizeof(RandomPool_Impl));
|
|
if (pImpl)
|
|
{
|
|
if (!__rtl_random_initPool (pImpl))
|
|
{
|
|
rtl_freeZeroMemory (pImpl, sizeof(RandomPool_Impl));
|
|
pImpl = (RandomPool_Impl*)NULL;
|
|
}
|
|
}
|
|
return ((rtlRandomPool)pImpl);
|
|
}
|
|
|
|
/*
|
|
* rtl_random_destroyPool.
|
|
*/
|
|
void SAL_CALL rtl_random_destroyPool (rtlRandomPool Pool) SAL_THROW_EXTERN_C()
|
|
{
|
|
RandomPool_Impl *pImpl = (RandomPool_Impl *)Pool;
|
|
if (pImpl)
|
|
{
|
|
rtl_digest_destroy (pImpl->m_hDigest);
|
|
rtl_freeZeroMemory (pImpl, sizeof (RandomPool_Impl));
|
|
}
|
|
}
|
|
|
|
/*
|
|
* rtl_random_addBytes.
|
|
*/
|
|
rtlRandomError SAL_CALL rtl_random_addBytes (
|
|
rtlRandomPool Pool, const void *Buffer, sal_Size Bytes) SAL_THROW_EXTERN_C()
|
|
{
|
|
RandomPool_Impl *pImpl = (RandomPool_Impl *)Pool;
|
|
const sal_uInt8 *pBuffer = (const sal_uInt8 *)Buffer;
|
|
|
|
if ((pImpl == NULL) || (pBuffer == NULL))
|
|
return rtl_Random_E_Argument;
|
|
|
|
__rtl_random_seedPool (pImpl, pBuffer, Bytes);
|
|
return rtl_Random_E_None;
|
|
}
|
|
|
|
/*
|
|
* rtl_random_getBytes.
|
|
*/
|
|
rtlRandomError SAL_CALL rtl_random_getBytes (
|
|
rtlRandomPool Pool, void *Buffer, sal_Size Bytes) SAL_THROW_EXTERN_C()
|
|
{
|
|
RandomPool_Impl *pImpl = (RandomPool_Impl *)Pool;
|
|
sal_uInt8 *pBuffer = (sal_uInt8 *)Buffer;
|
|
|
|
if ((pImpl == NULL) || (pBuffer == NULL))
|
|
return rtl_Random_E_Argument;
|
|
|
|
__rtl_random_readPool (pImpl, pBuffer, Bytes);
|
|
return rtl_Random_E_None;
|
|
}
|
|
|
|
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
|