/* -*- 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 #include #include #include #include #include #include #include #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) += 30328; \ \ (y) = 171 * ((y) % 177) - 2 * ((y) / 177); \ if ((y) < 0) (y) += 30269; \ \ (z) = 172 * ((z) % 176) - 35 * ((z) / 176); \ if ((z) < 0) (z) += 30307; \ } struct RandomData_Impl { sal_Int16 m_nX; sal_Int16 m_nY; sal_Int16 m_nZ; }; static double data (RandomData_Impl *pImpl); #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; }; static bool initPool(RandomPool_Impl *pImpl); static void seedPool( RandomPool_Impl *pImpl, const sal_uInt8 *pBuffer, sal_Size nBufLen); static void readPool( RandomPool_Impl *pImpl, sal_uInt8 *pBuffer, sal_Size nBufLen); static double data(RandomData_Impl *pImpl) { double random; RTL_RANDOM_RNG (pImpl->m_nX, pImpl->m_nY, pImpl->m_nZ); random = ((static_cast(pImpl->m_nX) / 30328.0) + (static_cast(pImpl->m_nY) / 30269.0) + (static_cast(pImpl->m_nZ) / 30307.0) ); random -= static_cast(static_cast(random)); return random; } static bool initPool(RandomPool_Impl *pImpl) { pImpl->m_hDigest = rtl_digest_create(RTL_RANDOM_DIGEST); if (pImpl->m_hDigest) { oslThreadIdentifier tid; 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. */ /* seedPool (pImpl, (sal_uInt8*)&tid, sizeof(tid)); seedPool (pImpl, (sal_uInt8*)&tv, sizeof(tv)); seedPool (pImpl, (sal_uInt8*)&rd, sizeof(rd)); */ tid = osl::Thread::getCurrentIdentifier(); tid = RTL_RANDOM_RNG_2(RTL_RANDOM_RNG_1(tid)); seedPool (pImpl, reinterpret_cast< sal_uInt8* >(&tid), sizeof(tid)); osl_getSystemTime (&tv); tv.Seconds = RTL_RANDOM_RNG_2(tv.Seconds); tv.Nanosec = RTL_RANDOM_RNG_2(tv.Nanosec); seedPool (pImpl, reinterpret_cast< sal_uInt8* >(&tv), sizeof(tv)); rd.m_nX = static_cast(((tid >> 1) << 1) + 1); rd.m_nY = static_cast(((tv.Seconds >> 1) << 1) + 1); rd.m_nZ = static_cast(((tv.Nanosec >> 1) << 1) + 1); seedPool (pImpl, reinterpret_cast< sal_uInt8* >(&rd), sizeof(rd)); while (pImpl->m_nData < RTL_RANDOM_SIZE_POOL) { seed = data (&rd); seedPool (pImpl, reinterpret_cast< sal_uInt8* >(&seed), sizeof(seed)); } return true; } return false; } static void 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; } static void 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); } rtlRandomPool SAL_CALL rtl_random_createPool() SAL_THROW_EXTERN_C() { RandomPool_Impl *pImpl = nullptr; /* try to get system random number, if it fail fall back on own pool */ pImpl = static_cast< RandomPool_Impl* >(rtl_allocateZeroMemory(sizeof(RandomPool_Impl))); if (pImpl) { char sanity[4]; if (!osl_get_system_random_data(sanity, 4)) { if (!initPool(pImpl)) { rtl_freeZeroMemory(pImpl, sizeof(RandomPool_Impl)); pImpl = nullptr; } } } return static_cast< rtlRandomPool >(pImpl); } void SAL_CALL rtl_random_destroyPool(rtlRandomPool Pool) SAL_THROW_EXTERN_C() { RandomPool_Impl *pImpl = static_cast< RandomPool_Impl* >(Pool); if (pImpl) { if (pImpl->m_hDigest) rtl_digest_destroy(pImpl->m_hDigest); rtl_freeZeroMemory (pImpl, sizeof(RandomPool_Impl)); } } rtlRandomError SAL_CALL rtl_random_addBytes( rtlRandomPool Pool, const void *Buffer, sal_Size Bytes) SAL_THROW_EXTERN_C() { RandomPool_Impl *pImpl = static_cast< RandomPool_Impl* >(Pool); const sal_uInt8 *pBuffer = static_cast< const sal_uInt8* >(Buffer); if (!pImpl || !pBuffer) return rtl_Random_E_Argument; if (pImpl->m_hDigest) seedPool (pImpl, pBuffer, Bytes); return rtl_Random_E_None; } rtlRandomError SAL_CALL rtl_random_getBytes ( rtlRandomPool Pool, void *Buffer, sal_Size Bytes) SAL_THROW_EXTERN_C() { RandomPool_Impl *pImpl = static_cast< RandomPool_Impl* >(Pool); sal_uInt8 *pBuffer = static_cast< sal_uInt8* >(Buffer); if (!pImpl || !pBuffer) return rtl_Random_E_Argument; if (pImpl->m_hDigest || !osl_get_system_random_data(static_cast< char* >(Buffer), Bytes)) { if (!pImpl->m_hDigest) { if (!initPool (pImpl)) return rtl_Random_E_Unknown; } readPool(pImpl, pBuffer, Bytes); } return rtl_Random_E_None; } /* vim:set shiftwidth=4 softtabstop=4 expandtab: */