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421 lines
11 KiB
421 lines
11 KiB
// ida.cpp - written and placed in the public domain by Wei Dai
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#include "pch.h"
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#include "ida.h"
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#include "algebra.h"
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#include "gf2_32.h"
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#include "polynomi.h"
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#include <functional>
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#include "polynomi.cpp"
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ANONYMOUS_NAMESPACE_BEGIN
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static const CryptoPP::GF2_32 field;
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NAMESPACE_END
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using namespace std;
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NAMESPACE_BEGIN(CryptoPP)
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void RawIDA::IsolatedInitialize(const NameValuePairs ¶meters)
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{
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if (!parameters.GetIntValue("RecoveryThreshold", m_threshold))
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throw InvalidArgument("RawIDA: missing RecoveryThreshold argument");
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if (m_threshold <= 0)
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throw InvalidArgument("RawIDA: RecoveryThreshold must be greater than 0");
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m_lastMapPosition = m_inputChannelMap.end();
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m_channelsReady = 0;
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m_channelsFinished = 0;
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m_w.New(m_threshold);
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m_y.New(m_threshold);
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m_inputQueues.reserve(m_threshold);
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m_outputChannelIds.clear();
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m_outputChannelIdStrings.clear();
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m_outputQueues.clear();
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word32 outputChannelID;
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if (parameters.GetValue("OutputChannelID", outputChannelID))
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AddOutputChannel(outputChannelID);
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else
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{
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int nShares = parameters.GetIntValueWithDefault("NumberOfShares", m_threshold);
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for (int i=0; i<nShares; i++)
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AddOutputChannel(i);
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}
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}
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unsigned int RawIDA::InsertInputChannel(word32 channelId)
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{
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if (m_lastMapPosition != m_inputChannelMap.end())
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{
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if (m_lastMapPosition->first == channelId)
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goto skipFind;
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++m_lastMapPosition;
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if (m_lastMapPosition != m_inputChannelMap.end() && m_lastMapPosition->first == channelId)
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goto skipFind;
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}
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m_lastMapPosition = m_inputChannelMap.find(channelId);
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skipFind:
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if (m_lastMapPosition == m_inputChannelMap.end())
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{
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if (m_inputChannelIds.size() == m_threshold)
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return m_threshold;
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m_lastMapPosition = m_inputChannelMap.insert(InputChannelMap::value_type(channelId, (unsigned int)m_inputChannelIds.size())).first;
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m_inputQueues.push_back(MessageQueue());
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m_inputChannelIds.push_back(channelId);
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if (m_inputChannelIds.size() == m_threshold)
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PrepareInterpolation();
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}
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return m_lastMapPosition->second;
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}
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unsigned int RawIDA::LookupInputChannel(word32 channelId) const
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{
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map<word32, unsigned int>::const_iterator it = m_inputChannelMap.find(channelId);
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if (it == m_inputChannelMap.end())
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return m_threshold;
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else
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return it->second;
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}
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void RawIDA::ChannelData(word32 channelId, const byte *inString, size_t length, bool messageEnd)
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{
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int i = InsertInputChannel(channelId);
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if (i < m_threshold)
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{
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lword size = m_inputQueues[i].MaxRetrievable();
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m_inputQueues[i].Put(inString, length);
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if (size < 4 && size + length >= 4)
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{
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m_channelsReady++;
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if (m_channelsReady == m_threshold)
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ProcessInputQueues();
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}
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if (messageEnd)
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{
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m_inputQueues[i].MessageEnd();
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if (m_inputQueues[i].NumberOfMessages() == 1)
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{
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m_channelsFinished++;
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if (m_channelsFinished == m_threshold)
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{
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m_channelsReady = 0;
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for (i=0; i<m_threshold; i++)
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m_channelsReady += m_inputQueues[i].AnyRetrievable();
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ProcessInputQueues();
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}
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}
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}
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}
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}
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lword RawIDA::InputBuffered(word32 channelId) const
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{
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int i = LookupInputChannel(channelId);
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return i < m_threshold ? m_inputQueues[i].MaxRetrievable() : 0;
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}
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void RawIDA::ComputeV(unsigned int i)
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{
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if (i >= m_v.size())
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{
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m_v.resize(i+1);
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m_outputToInput.resize(i+1);
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}
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m_outputToInput[i] = LookupInputChannel(m_outputChannelIds[i]);
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if (m_outputToInput[i] == m_threshold && i * m_threshold <= 1000*1000)
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{
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m_v[i].resize(m_threshold);
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PrepareBulkPolynomialInterpolationAt(field, m_v[i].begin(), m_outputChannelIds[i], &(m_inputChannelIds[0]), m_w.begin(), m_threshold);
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}
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}
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void RawIDA::AddOutputChannel(word32 channelId)
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{
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m_outputChannelIds.push_back(channelId);
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m_outputChannelIdStrings.push_back(WordToString(channelId));
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m_outputQueues.push_back(ByteQueue());
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if (m_inputChannelIds.size() == m_threshold)
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ComputeV((unsigned int)m_outputChannelIds.size() - 1);
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}
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void RawIDA::PrepareInterpolation()
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{
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assert(m_inputChannelIds.size() == m_threshold);
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PrepareBulkPolynomialInterpolation(field, m_w.begin(), &(m_inputChannelIds[0]), m_threshold);
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for (unsigned int i=0; i<m_outputChannelIds.size(); i++)
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ComputeV(i);
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}
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void RawIDA::ProcessInputQueues()
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{
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bool finished = (m_channelsFinished == m_threshold);
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int i;
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while (finished ? m_channelsReady > 0 : m_channelsReady == m_threshold)
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{
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m_channelsReady = 0;
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for (i=0; i<m_threshold; i++)
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{
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MessageQueue &queue = m_inputQueues[i];
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queue.GetWord32(m_y[i]);
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if (finished)
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m_channelsReady += queue.AnyRetrievable();
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else
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m_channelsReady += queue.NumberOfMessages() > 0 || queue.MaxRetrievable() >= 4;
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}
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for (i=0; (unsigned int)i<m_outputChannelIds.size(); i++)
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{
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if (m_outputToInput[i] != m_threshold)
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m_outputQueues[i].PutWord32(m_y[m_outputToInput[i]]);
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else if (m_v[i].size() == m_threshold)
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m_outputQueues[i].PutWord32(BulkPolynomialInterpolateAt(field, m_y.begin(), m_v[i].begin(), m_threshold));
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else
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{
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m_u.resize(m_threshold);
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PrepareBulkPolynomialInterpolationAt(field, m_u.begin(), m_outputChannelIds[i], &(m_inputChannelIds[0]), m_w.begin(), m_threshold);
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m_outputQueues[i].PutWord32(BulkPolynomialInterpolateAt(field, m_y.begin(), m_u.begin(), m_threshold));
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}
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}
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}
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if (m_outputChannelIds.size() > 0 && m_outputQueues[0].AnyRetrievable())
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FlushOutputQueues();
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if (finished)
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{
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OutputMessageEnds();
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m_channelsReady = 0;
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m_channelsFinished = 0;
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m_v.clear();
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vector<MessageQueue> inputQueues;
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vector<word32> inputChannelIds;
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inputQueues.swap(m_inputQueues);
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inputChannelIds.swap(m_inputChannelIds);
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m_inputChannelMap.clear();
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m_lastMapPosition = m_inputChannelMap.end();
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for (i=0; i<m_threshold; i++)
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{
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inputQueues[i].GetNextMessage();
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inputQueues[i].TransferAllTo(*AttachedTransformation(), WordToString(inputChannelIds[i]));
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}
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}
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}
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void RawIDA::FlushOutputQueues()
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{
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for (unsigned int i=0; i<m_outputChannelIds.size(); i++)
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m_outputQueues[i].TransferAllTo(*AttachedTransformation(), m_outputChannelIdStrings[i]);
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}
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void RawIDA::OutputMessageEnds()
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{
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if (GetAutoSignalPropagation() != 0)
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{
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for (unsigned int i=0; i<m_outputChannelIds.size(); i++)
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AttachedTransformation()->ChannelMessageEnd(m_outputChannelIdStrings[i], GetAutoSignalPropagation()-1);
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}
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}
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// ****************************************************************
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void SecretSharing::IsolatedInitialize(const NameValuePairs ¶meters)
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{
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m_pad = parameters.GetValueWithDefault("AddPadding", true);
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m_ida.IsolatedInitialize(parameters);
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}
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size_t SecretSharing::Put2(const byte *begin, size_t length, int messageEnd, bool blocking)
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{
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if (!blocking)
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throw BlockingInputOnly("SecretSharing");
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SecByteBlock buf(UnsignedMin(256, length));
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unsigned int threshold = m_ida.GetThreshold();
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while (length > 0)
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{
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size_t len = STDMIN(length, buf.size());
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m_ida.ChannelData(0xffffffff, begin, len, false);
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for (unsigned int i=0; i<threshold-1; i++)
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{
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m_rng.GenerateBlock(buf, len);
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m_ida.ChannelData(i, buf, len, false);
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}
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length -= len;
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begin += len;
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}
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if (messageEnd)
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{
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m_ida.SetAutoSignalPropagation(messageEnd-1);
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if (m_pad)
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{
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SecretSharing::Put(1);
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while (m_ida.InputBuffered(0xffffffff) > 0)
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SecretSharing::Put(0);
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}
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m_ida.ChannelData(0xffffffff, NULL, 0, true);
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for (unsigned int i=0; i<m_ida.GetThreshold()-1; i++)
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m_ida.ChannelData(i, NULL, 0, true);
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}
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return 0;
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}
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void SecretRecovery::IsolatedInitialize(const NameValuePairs ¶meters)
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{
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m_pad = parameters.GetValueWithDefault("RemovePadding", true);
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RawIDA::IsolatedInitialize(CombinedNameValuePairs(parameters, MakeParameters("OutputChannelID", (word32)0xffffffff)));
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}
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void SecretRecovery::FlushOutputQueues()
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{
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if (m_pad)
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m_outputQueues[0].TransferTo(*AttachedTransformation(), m_outputQueues[0].MaxRetrievable()-4);
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else
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m_outputQueues[0].TransferTo(*AttachedTransformation());
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}
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void SecretRecovery::OutputMessageEnds()
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{
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if (m_pad)
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{
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PaddingRemover paddingRemover(new Redirector(*AttachedTransformation()));
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m_outputQueues[0].TransferAllTo(paddingRemover);
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}
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if (GetAutoSignalPropagation() != 0)
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AttachedTransformation()->MessageEnd(GetAutoSignalPropagation()-1);
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}
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// ****************************************************************
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void InformationDispersal::IsolatedInitialize(const NameValuePairs ¶meters)
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{
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m_nextChannel = 0;
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m_pad = parameters.GetValueWithDefault("AddPadding", true);
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m_ida.IsolatedInitialize(parameters);
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}
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size_t InformationDispersal::Put2(const byte *begin, size_t length, int messageEnd, bool blocking)
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{
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if (!blocking)
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throw BlockingInputOnly("InformationDispersal");
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while (length--)
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{
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m_ida.ChannelData(m_nextChannel, begin, 1, false);
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begin++;
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m_nextChannel++;
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if (m_nextChannel == m_ida.GetThreshold())
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m_nextChannel = 0;
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}
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if (messageEnd)
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{
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m_ida.SetAutoSignalPropagation(messageEnd-1);
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if (m_pad)
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InformationDispersal::Put(1);
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for (word32 i=0; i<m_ida.GetThreshold(); i++)
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m_ida.ChannelData(i, NULL, 0, true);
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}
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return 0;
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}
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void InformationRecovery::IsolatedInitialize(const NameValuePairs ¶meters)
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{
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m_pad = parameters.GetValueWithDefault("RemovePadding", true);
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RawIDA::IsolatedInitialize(parameters);
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}
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void InformationRecovery::FlushOutputQueues()
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{
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while (m_outputQueues[0].AnyRetrievable())
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{
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for (unsigned int i=0; i<m_outputChannelIds.size(); i++)
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m_outputQueues[i].TransferTo(m_queue, 1);
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}
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if (m_pad)
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m_queue.TransferTo(*AttachedTransformation(), m_queue.MaxRetrievable()-4*m_threshold);
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else
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m_queue.TransferTo(*AttachedTransformation());
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}
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void InformationRecovery::OutputMessageEnds()
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{
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if (m_pad)
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{
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PaddingRemover paddingRemover(new Redirector(*AttachedTransformation()));
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m_queue.TransferAllTo(paddingRemover);
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}
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if (GetAutoSignalPropagation() != 0)
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AttachedTransformation()->MessageEnd(GetAutoSignalPropagation()-1);
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}
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size_t PaddingRemover::Put2(const byte *begin, size_t length, int messageEnd, bool blocking)
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{
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if (!blocking)
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throw BlockingInputOnly("PaddingRemover");
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const byte *const end = begin + length;
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if (m_possiblePadding)
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{
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size_t len = find_if(begin, end, bind2nd(not_equal_to<byte>(), 0)) - begin;
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m_zeroCount += len;
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begin += len;
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if (begin == end)
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return 0;
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AttachedTransformation()->Put(1);
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while (m_zeroCount--)
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AttachedTransformation()->Put(0);
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AttachedTransformation()->Put(*begin++);
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m_possiblePadding = false;
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}
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#if defined(_MSC_VER) && !defined(__MWERKS__) && (_MSC_VER <= 1300)
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// VC60 and VC7 workaround: built-in reverse_iterator has two template parameters, Dinkumware only has one
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typedef reverse_bidirectional_iterator<const byte *, const byte> RevIt;
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#elif defined(_RWSTD_NO_CLASS_PARTIAL_SPEC)
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typedef reverse_iterator<const byte *, random_access_iterator_tag, const byte> RevIt;
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#else
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typedef reverse_iterator<const byte *> RevIt;
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#endif
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const byte *x = find_if(RevIt(end), RevIt(begin), bind2nd(not_equal_to<byte>(), 0)).base();
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if (x != begin && *(x-1) == 1)
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{
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AttachedTransformation()->Put(begin, x-begin-1);
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m_possiblePadding = true;
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m_zeroCount = end - x;
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}
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else
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AttachedTransformation()->Put(begin, end-begin);
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if (messageEnd)
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{
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m_possiblePadding = false;
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Output(0, begin, length, messageEnd, blocking);
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}
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return 0;
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}
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NAMESPACE_END
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