diff options
Diffstat (limited to 'CryptoPP/ida.cpp')
| -rw-r--r-- | CryptoPP/ida.cpp | 421 |
1 files changed, 0 insertions, 421 deletions
diff --git a/CryptoPP/ida.cpp b/CryptoPP/ida.cpp deleted file mode 100644 index 5cb43b228..000000000 --- a/CryptoPP/ida.cpp +++ /dev/null @@ -1,421 +0,0 @@ -// ida.cpp - written and placed in the public domain by Wei Dai - -#include "pch.h" -#include "ida.h" - -#include "algebra.h" -#include "gf2_32.h" -#include "polynomi.h" -#include <functional> - -#include "polynomi.cpp" - -ANONYMOUS_NAMESPACE_BEGIN -static const CryptoPP::GF2_32 field; -NAMESPACE_END - -using namespace std; - -NAMESPACE_BEGIN(CryptoPP) - -void RawIDA::IsolatedInitialize(const NameValuePairs ¶meters) -{ - if (!parameters.GetIntValue("RecoveryThreshold", m_threshold)) - throw InvalidArgument("RawIDA: missing RecoveryThreshold argument"); - - if (m_threshold <= 0) - throw InvalidArgument("RawIDA: RecoveryThreshold must be greater than 0"); - - m_lastMapPosition = m_inputChannelMap.end(); - m_channelsReady = 0; - m_channelsFinished = 0; - m_w.New(m_threshold); - m_y.New(m_threshold); - m_inputQueues.reserve(m_threshold); - - m_outputChannelIds.clear(); - m_outputChannelIdStrings.clear(); - m_outputQueues.clear(); - - word32 outputChannelID; - if (parameters.GetValue("OutputChannelID", outputChannelID)) - AddOutputChannel(outputChannelID); - else - { - int nShares = parameters.GetIntValueWithDefault("NumberOfShares", m_threshold); - for (int i=0; i<nShares; i++) - AddOutputChannel(i); - } -} - -unsigned int RawIDA::InsertInputChannel(word32 channelId) -{ - if (m_lastMapPosition != m_inputChannelMap.end()) - { - if (m_lastMapPosition->first == channelId) - goto skipFind; - ++m_lastMapPosition; - if (m_lastMapPosition != m_inputChannelMap.end() && m_lastMapPosition->first == channelId) - goto skipFind; - } - m_lastMapPosition = m_inputChannelMap.find(channelId); - -skipFind: - if (m_lastMapPosition == m_inputChannelMap.end()) - { - if (m_inputChannelIds.size() == m_threshold) - return m_threshold; - - m_lastMapPosition = m_inputChannelMap.insert(InputChannelMap::value_type(channelId, (unsigned int)m_inputChannelIds.size())).first; - m_inputQueues.push_back(MessageQueue()); - m_inputChannelIds.push_back(channelId); - - if (m_inputChannelIds.size() == m_threshold) - PrepareInterpolation(); - } - return m_lastMapPosition->second; -} - -unsigned int RawIDA::LookupInputChannel(word32 channelId) const -{ - map<word32, unsigned int>::const_iterator it = m_inputChannelMap.find(channelId); - if (it == m_inputChannelMap.end()) - return m_threshold; - else - return it->second; -} - -void RawIDA::ChannelData(word32 channelId, const byte *inString, size_t length, bool messageEnd) -{ - int i = InsertInputChannel(channelId); - if (i < m_threshold) - { - lword size = m_inputQueues[i].MaxRetrievable(); - m_inputQueues[i].Put(inString, length); - if (size < 4 && size + length >= 4) - { - m_channelsReady++; - if (m_channelsReady == m_threshold) - ProcessInputQueues(); - } - - if (messageEnd) - { - m_inputQueues[i].MessageEnd(); - if (m_inputQueues[i].NumberOfMessages() == 1) - { - m_channelsFinished++; - if (m_channelsFinished == m_threshold) - { - m_channelsReady = 0; - for (i=0; i<m_threshold; i++) - m_channelsReady += m_inputQueues[i].AnyRetrievable(); - ProcessInputQueues(); - } - } - } - } -} - -lword RawIDA::InputBuffered(word32 channelId) const -{ - int i = LookupInputChannel(channelId); - return i < m_threshold ? m_inputQueues[i].MaxRetrievable() : 0; -} - -void RawIDA::ComputeV(unsigned int i) -{ - if (i >= m_v.size()) - { - m_v.resize(i+1); - m_outputToInput.resize(i+1); - } - - m_outputToInput[i] = LookupInputChannel(m_outputChannelIds[i]); - if (m_outputToInput[i] == m_threshold && i * m_threshold <= 1000*1000) - { - m_v[i].resize(m_threshold); - PrepareBulkPolynomialInterpolationAt(field, m_v[i].begin(), m_outputChannelIds[i], &(m_inputChannelIds[0]), m_w.begin(), m_threshold); - } -} - -void RawIDA::AddOutputChannel(word32 channelId) -{ - m_outputChannelIds.push_back(channelId); - m_outputChannelIdStrings.push_back(WordToString(channelId)); - m_outputQueues.push_back(ByteQueue()); - if (m_inputChannelIds.size() == m_threshold) - ComputeV((unsigned int)m_outputChannelIds.size() - 1); -} - -void RawIDA::PrepareInterpolation() -{ - assert(m_inputChannelIds.size() == m_threshold); - PrepareBulkPolynomialInterpolation(field, m_w.begin(), &(m_inputChannelIds[0]), m_threshold); - for (unsigned int i=0; i<m_outputChannelIds.size(); i++) - ComputeV(i); -} - -void RawIDA::ProcessInputQueues() -{ - bool finished = (m_channelsFinished == m_threshold); - int i; - - while (finished ? m_channelsReady > 0 : m_channelsReady == m_threshold) - { - m_channelsReady = 0; - for (i=0; i<m_threshold; i++) - { - MessageQueue &queue = m_inputQueues[i]; - queue.GetWord32(m_y[i]); - - if (finished) - m_channelsReady += queue.AnyRetrievable(); - else - m_channelsReady += queue.NumberOfMessages() > 0 || queue.MaxRetrievable() >= 4; - } - - for (i=0; (unsigned int)i<m_outputChannelIds.size(); i++) - { - if (m_outputToInput[i] != m_threshold) - m_outputQueues[i].PutWord32(m_y[m_outputToInput[i]]); - else if (m_v[i].size() == m_threshold) - m_outputQueues[i].PutWord32(BulkPolynomialInterpolateAt(field, m_y.begin(), m_v[i].begin(), m_threshold)); - else - { - m_u.resize(m_threshold); - PrepareBulkPolynomialInterpolationAt(field, m_u.begin(), m_outputChannelIds[i], &(m_inputChannelIds[0]), m_w.begin(), m_threshold); - m_outputQueues[i].PutWord32(BulkPolynomialInterpolateAt(field, m_y.begin(), m_u.begin(), m_threshold)); - } - } - } - - if (m_outputChannelIds.size() > 0 && m_outputQueues[0].AnyRetrievable()) - FlushOutputQueues(); - - if (finished) - { - OutputMessageEnds(); - - m_channelsReady = 0; - m_channelsFinished = 0; - m_v.clear(); - - vector<MessageQueue> inputQueues; - vector<word32> inputChannelIds; - - inputQueues.swap(m_inputQueues); - inputChannelIds.swap(m_inputChannelIds); - m_inputChannelMap.clear(); - m_lastMapPosition = m_inputChannelMap.end(); - - for (i=0; i<m_threshold; i++) - { - inputQueues[i].GetNextMessage(); - inputQueues[i].TransferAllTo(*AttachedTransformation(), WordToString(inputChannelIds[i])); - } - } -} - -void RawIDA::FlushOutputQueues() -{ - for (unsigned int i=0; i<m_outputChannelIds.size(); i++) - m_outputQueues[i].TransferAllTo(*AttachedTransformation(), m_outputChannelIdStrings[i]); -} - -void RawIDA::OutputMessageEnds() -{ - if (GetAutoSignalPropagation() != 0) - { - for (unsigned int i=0; i<m_outputChannelIds.size(); i++) - AttachedTransformation()->ChannelMessageEnd(m_outputChannelIdStrings[i], GetAutoSignalPropagation()-1); - } -} - -// **************************************************************** - -void SecretSharing::IsolatedInitialize(const NameValuePairs ¶meters) -{ - m_pad = parameters.GetValueWithDefault("AddPadding", true); - m_ida.IsolatedInitialize(parameters); -} - -size_t SecretSharing::Put2(const byte *begin, size_t length, int messageEnd, bool blocking) -{ - if (!blocking) - throw BlockingInputOnly("SecretSharing"); - - SecByteBlock buf(UnsignedMin(256, length)); - unsigned int threshold = m_ida.GetThreshold(); - while (length > 0) - { - size_t len = STDMIN(length, buf.size()); - m_ida.ChannelData(0xffffffff, begin, len, false); - for (unsigned int i=0; i<threshold-1; i++) - { - m_rng.GenerateBlock(buf, len); - m_ida.ChannelData(i, buf, len, false); - } - length -= len; - begin += len; - } - - if (messageEnd) - { - m_ida.SetAutoSignalPropagation(messageEnd-1); - if (m_pad) - { - SecretSharing::Put(1); - while (m_ida.InputBuffered(0xffffffff) > 0) - SecretSharing::Put(0); - } - m_ida.ChannelData(0xffffffff, NULL, 0, true); - for (unsigned int i=0; i<m_ida.GetThreshold()-1; i++) - m_ida.ChannelData(i, NULL, 0, true); - } - - return 0; -} - -void SecretRecovery::IsolatedInitialize(const NameValuePairs ¶meters) -{ - m_pad = parameters.GetValueWithDefault("RemovePadding", true); - RawIDA::IsolatedInitialize(CombinedNameValuePairs(parameters, MakeParameters("OutputChannelID", (word32)0xffffffff))); -} - -void SecretRecovery::FlushOutputQueues() -{ - if (m_pad) - m_outputQueues[0].TransferTo(*AttachedTransformation(), m_outputQueues[0].MaxRetrievable()-4); - else - m_outputQueues[0].TransferTo(*AttachedTransformation()); -} - -void SecretRecovery::OutputMessageEnds() -{ - if (m_pad) - { - PaddingRemover paddingRemover(new Redirector(*AttachedTransformation())); - m_outputQueues[0].TransferAllTo(paddingRemover); - } - - if (GetAutoSignalPropagation() != 0) - AttachedTransformation()->MessageEnd(GetAutoSignalPropagation()-1); -} - -// **************************************************************** - -void InformationDispersal::IsolatedInitialize(const NameValuePairs ¶meters) -{ - m_nextChannel = 0; - m_pad = parameters.GetValueWithDefault("AddPadding", true); - m_ida.IsolatedInitialize(parameters); -} - -size_t InformationDispersal::Put2(const byte *begin, size_t length, int messageEnd, bool blocking) -{ - if (!blocking) - throw BlockingInputOnly("InformationDispersal"); - - while (length--) - { - m_ida.ChannelData(m_nextChannel, begin, 1, false); - begin++; - m_nextChannel++; - if (m_nextChannel == m_ida.GetThreshold()) - m_nextChannel = 0; - } - - if (messageEnd) - { - m_ida.SetAutoSignalPropagation(messageEnd-1); - if (m_pad) - InformationDispersal::Put(1); - for (word32 i=0; i<m_ida.GetThreshold(); i++) - m_ida.ChannelData(i, NULL, 0, true); - } - - return 0; -} - -void InformationRecovery::IsolatedInitialize(const NameValuePairs ¶meters) -{ - m_pad = parameters.GetValueWithDefault("RemovePadding", true); - RawIDA::IsolatedInitialize(parameters); -} - -void InformationRecovery::FlushOutputQueues() -{ - while (m_outputQueues[0].AnyRetrievable()) - { - for (unsigned int i=0; i<m_outputChannelIds.size(); i++) - m_outputQueues[i].TransferTo(m_queue, 1); - } - - if (m_pad) - m_queue.TransferTo(*AttachedTransformation(), m_queue.MaxRetrievable()-4*m_threshold); - else - m_queue.TransferTo(*AttachedTransformation()); -} - -void InformationRecovery::OutputMessageEnds() -{ - if (m_pad) - { - PaddingRemover paddingRemover(new Redirector(*AttachedTransformation())); - m_queue.TransferAllTo(paddingRemover); - } - - if (GetAutoSignalPropagation() != 0) - AttachedTransformation()->MessageEnd(GetAutoSignalPropagation()-1); -} - -size_t PaddingRemover::Put2(const byte *begin, size_t length, int messageEnd, bool blocking) -{ - if (!blocking) - throw BlockingInputOnly("PaddingRemover"); - - const byte *const end = begin + length; - - if (m_possiblePadding) - { - size_t len = find_if(begin, end, bind2nd(not_equal_to<byte>(), 0)) - begin; - m_zeroCount += len; - begin += len; - if (begin == end) - return 0; - - AttachedTransformation()->Put(1); - while (m_zeroCount--) - AttachedTransformation()->Put(0); - AttachedTransformation()->Put(*begin++); - m_possiblePadding = false; - } - -#if defined(_MSC_VER) && !defined(__MWERKS__) && (_MSC_VER <= 1300) - // VC60 and VC7 workaround: built-in reverse_iterator has two template parameters, Dinkumware only has one - typedef reverse_bidirectional_iterator<const byte *, const byte> RevIt; -#elif defined(_RWSTD_NO_CLASS_PARTIAL_SPEC) - typedef reverse_iterator<const byte *, random_access_iterator_tag, const byte> RevIt; -#else - typedef reverse_iterator<const byte *> RevIt; -#endif - const byte *x = find_if(RevIt(end), RevIt(begin), bind2nd(not_equal_to<byte>(), 0)).base(); - if (x != begin && *(x-1) == 1) - { - AttachedTransformation()->Put(begin, x-begin-1); - m_possiblePadding = true; - m_zeroCount = end - x; - } - else - AttachedTransformation()->Put(begin, end-begin); - - if (messageEnd) - { - m_possiblePadding = false; - Output(0, begin, length, messageEnd, blocking); - } - return 0; -} - -NAMESPACE_END |