ESP-IDF
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#include "random.hpp"
#include <openthread/platform/entropy.h>
#include "common/code_utils.hpp"
#include "common/debug.hpp"
ot
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SourceVuESP-IDF Framework and ExamplesESP-IDFcomponents/openthread/openthread/src/core/common/random.cpp
 
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/* * Copyright (c) 2019, The OpenThread Authors. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the copyright holder nor the * names of its contributors may be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. *//* ... */ /** * @file * This file provides an implementation of OpenThread random number generation manager class. *//* ... */ #include "random.hpp" #include <openthread/platform/entropy.h> #include "common/code_utils.hpp" #include "common/debug.hpp" namespace ot { namespace Random { uint16_t Manager::sInitCount = 0; Manager::NonCryptoPrng Manager::sPrng; Manager::Manager(void) { uint32_t seed; OT_ASSERT(sInitCount < 0xffff); VerifyOrExit(sInitCount == 0); #if !OPENTHREAD_RADIO otPlatCryptoRandomInit(); SuccessOrAssert(Random::Crypto::Fill(seed));/* ... */ #else SuccessOrAssert(otPlatEntropyGet(reinterpret_cast<uint8_t *>(&seed), sizeof(seed))); #endif sPrng.Init(seed); exit: sInitCount++; }{ ... } Manager::~Manager(void) { OT_ASSERT(sInitCount > 0); sInitCount--; VerifyOrExit(sInitCount == 0); #if !OPENTHREAD_RADIO otPlatCryptoRandomDeinit(); #endif exit: return; }{ ... } uint32_t Manager::NonCryptoGetUint32(void) { OT_ASSERT(sInitCount > 0); return sPrng.GetNext(); }{ ... } //------------------------------------------------------------------- // NonCryptoPrng void Manager::NonCryptoPrng::Init(uint32_t aSeed) { // The PRNG has a cycle of length 1 for the below two initial // seeds. For all other seed values the cycle is ~2^31 long. if ((aSeed == 0) || (aSeed == 0x7fffffff)) { aSeed = 0x1; }{...} mState = aSeed; }{ ... } uint32_t Manager::NonCryptoPrng::GetNext(void) { uint32_t mlcg, p, q; uint64_t tmpstate; tmpstate = static_cast<uint64_t>(33614) * static_cast<uint64_t>(mState); q = tmpstate & 0xffffffff; q = q >> 1; p = tmpstate >> 32; mlcg = p + q; if (mlcg & 0x80000000) { mlcg &= 0x7fffffff; mlcg++; }{...} mState = mlcg; return mlcg; }{ ... } //------------------------------------------------------------------- namespace NonCrypto { uint8_t GetUint8InRange(uint8_t aMin, uint8_t aMax) { OT_ASSERT(aMax > aMin); return (aMin + (GetUint8() % (aMax - aMin))); }{ ... } uint16_t GetUint16InRange(uint16_t aMin, uint16_t aMax) { OT_ASSERT(aMax > aMin); return (aMin + (GetUint16() % (aMax - aMin))); }{ ... } uint32_t GetUint32InRange(uint32_t aMin, uint32_t aMax) { OT_ASSERT(aMax > aMin); return (aMin + (GetUint32() % (aMax - aMin))); }{ ... } void FillBuffer(uint8_t *aBuffer, uint16_t aSize) { while (aSize-- != 0) { *aBuffer++ = GetUint8(); }{...} }{ ... } uint32_t AddJitter(uint32_t aValue, uint16_t aJitter) { uint32_t delay = 0; VerifyOrExit(aValue != 0); aJitter = (aJitter <= aValue) ? aJitter : static_cast<uint16_t>(aValue); delay = aValue + GetUint32InRange(0, 2 * aJitter + 1) - aJitter; exit: return delay; }{ ... } }{...} // namespace NonCrypto }{...} // namespace Random }{...} // namespace ot
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