Adding upstream version 4:7.4.7.upstream/4%7.4.7upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 310 insertions, 0 deletions

diff --git a/sal/rtl/random.cxx b/sal/rtl/random.cxx
new file mode 100644
index 000000000..418358b22
--- /dev/null
+++ b/sal/rtl/random.cxx
@@ -0,0 +1,310 @@
+/* -*- 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/config.h>
+
+#include <cmath>
+
+#include <sal/types.h>
+#include <o3tl/temporary.hxx>
+#include <osl/thread.h>
+#include <osl/thread.hxx>
+#include <osl/time.h>
+#include <rtl/alloc.h>
+#include <rtl/digest.h>
+#include <rtl/random.h>
+#include <oslrandom.h>
+
+#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; \
+}
+
+namespace {
+
+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
+
+namespace {
+
+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<double>(pImpl->m_nX) / 30328.0) +
+              (static_cast<double>(pImpl->m_nY) / 30269.0) +
+              (static_cast<double>(pImpl->m_nZ) / 30307.0)   );
+
+    return std::modf(random, &o3tl::temporary(double()));
+}
+
+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<sal_Int16>(((tid        >> 1) << 1) + 1);
+        rd.m_nY = static_cast<sal_Int16>(((tv.Seconds >> 1) << 1) + 1);
+        rd.m_nZ = static_cast<sal_Int16>(((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()
+{
+    /* try to get system random number, if it fail fall back on own pool */
+    RandomPool_Impl *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 && !initPool(pImpl))
+            return rtl_Random_E_Unknown;
+        readPool(pImpl, pBuffer, Bytes);
+    }
+    return rtl_Random_E_None;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */