1 files changed, 1120 insertions, 0 deletions

diff --git a/lib/cryptopp/filters.cpp b/lib/cryptopp/filters.cpp
new file mode 100644
index 000000000..083dfd361
--- /dev/null
+++ b/lib/cryptopp/filters.cpp
@@ -0,0 +1,1120 @@
+// filters.cpp - written and placed in the public domain by Wei Dai
+
+#include "pch.h"
+
+#ifndef CRYPTOPP_IMPORTS
+
+#include "filters.h"
+#include "mqueue.h"
+#include "fltrimpl.h"
+#include "argnames.h"
+#include <memory>
+#include <functional>
+
+NAMESPACE_BEGIN(CryptoPP)
+
+Filter::Filter(BufferedTransformation *attachment)
+	: m_attachment(attachment), m_continueAt(0)
+{
+}
+
+BufferedTransformation * Filter::NewDefaultAttachment() const
+{
+	return new MessageQueue;
+}
+
+BufferedTransformation * Filter::AttachedTransformation()
+{
+	if (m_attachment.get() == NULL)
+		m_attachment.reset(NewDefaultAttachment());
+	return m_attachment.get();
+}
+
+const BufferedTransformation *Filter::AttachedTransformation() const
+{
+	if (m_attachment.get() == NULL)
+		const_cast<Filter *>(this)->m_attachment.reset(NewDefaultAttachment());
+	return m_attachment.get();
+}
+
+void Filter::Detach(BufferedTransformation *newOut)
+{
+	m_attachment.reset(newOut);
+}
+
+void Filter::Insert(Filter *filter)
+{
+	filter->m_attachment.reset(m_attachment.release());
+	m_attachment.reset(filter);
+}
+
+size_t Filter::CopyRangeTo2(BufferedTransformation &target, lword &begin, lword end, const std::string &channel, bool blocking) const
+{
+	return AttachedTransformation()->CopyRangeTo2(target, begin, end, channel, blocking);
+}
+
+size_t Filter::TransferTo2(BufferedTransformation &target, lword &transferBytes, const std::string &channel, bool blocking)
+{
+	return AttachedTransformation()->TransferTo2(target, transferBytes, channel, blocking);
+}
+
+void Filter::Initialize(const NameValuePairs &parameters, int propagation)
+{
+	m_continueAt = 0;
+	IsolatedInitialize(parameters);
+	PropagateInitialize(parameters, propagation);
+}
+
+bool Filter::Flush(bool hardFlush, int propagation, bool blocking)
+{
+	switch (m_continueAt)
+	{
+	case 0:
+		if (IsolatedFlush(hardFlush, blocking))
+			return true;
+	case 1:
+		if (OutputFlush(1, hardFlush, propagation, blocking))
+			return true;
+	}
+	return false;
+}
+
+bool Filter::MessageSeriesEnd(int propagation, bool blocking)
+{
+	switch (m_continueAt)
+	{
+	case 0:
+		if (IsolatedMessageSeriesEnd(blocking))
+			return true;
+	case 1:
+		if (ShouldPropagateMessageSeriesEnd() && OutputMessageSeriesEnd(1, propagation, blocking))
+			return true;
+	}
+	return false;
+}
+
+void Filter::PropagateInitialize(const NameValuePairs &parameters, int propagation)
+{
+	if (propagation)
+		AttachedTransformation()->Initialize(parameters, propagation-1);
+}
+
+size_t Filter::OutputModifiable(int outputSite, byte *inString, size_t length, int messageEnd, bool blocking, const std::string &channel)
+{
+	if (messageEnd)
+		messageEnd--;
+	size_t result = AttachedTransformation()->ChannelPutModifiable2(channel, inString, length, messageEnd, blocking);
+	m_continueAt = result ? outputSite : 0;
+	return result;
+}
+
+size_t Filter::Output(int outputSite, const byte *inString, size_t length, int messageEnd, bool blocking, const std::string &channel)
+{
+	if (messageEnd)
+		messageEnd--;
+	size_t result = AttachedTransformation()->ChannelPut2(channel, inString, length, messageEnd, blocking);
+	m_continueAt = result ? outputSite : 0;
+	return result;
+}
+
+bool Filter::OutputFlush(int outputSite, bool hardFlush, int propagation, bool blocking, const std::string &channel)
+{
+	if (propagation && AttachedTransformation()->ChannelFlush(channel, hardFlush, propagation-1, blocking))
+	{
+		m_continueAt = outputSite;
+		return true;
+	}
+	m_continueAt = 0;
+	return false;
+}
+
+bool Filter::OutputMessageSeriesEnd(int outputSite, int propagation, bool blocking, const std::string &channel)
+{
+	if (propagation && AttachedTransformation()->ChannelMessageSeriesEnd(channel, propagation-1, blocking))
+	{
+		m_continueAt = outputSite;
+		return true;
+	}
+	m_continueAt = 0;
+	return false;
+}
+
+// *************************************************************
+
+void MeterFilter::ResetMeter()
+{
+	m_currentMessageBytes = m_totalBytes = m_currentSeriesMessages = m_totalMessages = m_totalMessageSeries = 0;
+	m_rangesToSkip.clear();
+}
+
+void MeterFilter::AddRangeToSkip(unsigned int message, lword position, lword size, bool sortNow)
+{
+	MessageRange r = {message, position, size};
+	m_rangesToSkip.push_back(r);
+	if (sortNow)
+		std::sort(m_rangesToSkip.begin(), m_rangesToSkip.end());
+}
+
+size_t MeterFilter::PutMaybeModifiable(byte *begin, size_t length, int messageEnd, bool blocking, bool modifiable)
+{
+	if (!m_transparent)
+		return 0;
+
+	size_t t;
+	FILTER_BEGIN;
+
+	m_begin = begin;
+	m_length = length;
+
+	while (m_length > 0 || messageEnd)
+	{
+		if (m_length > 0  && !m_rangesToSkip.empty() && m_rangesToSkip.front().message == m_totalMessages && m_currentMessageBytes + m_length > m_rangesToSkip.front().position)
+		{
+			FILTER_OUTPUT_MAYBE_MODIFIABLE(1, m_begin, t = (size_t)SaturatingSubtract(m_rangesToSkip.front().position, m_currentMessageBytes), false, modifiable);
+
+			assert(t < m_length);
+			m_begin += t;
+			m_length -= t;
+			m_currentMessageBytes += t;
+			m_totalBytes += t;
+
+			if (m_currentMessageBytes + m_length < m_rangesToSkip.front().position + m_rangesToSkip.front().size)
+				t = m_length;
+			else
+			{
+				t = (size_t)SaturatingSubtract(m_rangesToSkip.front().position + m_rangesToSkip.front().size, m_currentMessageBytes);
+				assert(t <= m_length);
+				m_rangesToSkip.pop_front();
+			}
+
+			m_begin += t;
+			m_length -= t;
+			m_currentMessageBytes += t;
+			m_totalBytes += t;
+		}
+		else
+		{
+			FILTER_OUTPUT_MAYBE_MODIFIABLE(2, m_begin, m_length, messageEnd, modifiable);
+
+			m_currentMessageBytes += m_length;
+			m_totalBytes += m_length;
+			m_length = 0;
+
+			if (messageEnd)
+			{
+				m_currentMessageBytes = 0;
+				m_currentSeriesMessages++;
+				m_totalMessages++;
+				messageEnd = false;
+			}
+		}
+	}
+
+	FILTER_END_NO_MESSAGE_END;
+}
+
+size_t MeterFilter::Put2(const byte *begin, size_t length, int messageEnd, bool blocking)
+{
+	return PutMaybeModifiable(const_cast<byte *>(begin), length, messageEnd, blocking, false);
+}
+
+size_t MeterFilter::PutModifiable2(byte *begin, size_t length, int messageEnd, bool blocking)
+{
+	return PutMaybeModifiable(begin, length, messageEnd, blocking, true);
+}
+
+bool MeterFilter::IsolatedMessageSeriesEnd(bool blocking)
+{
+	m_currentMessageBytes = 0;
+	m_currentSeriesMessages = 0;
+	m_totalMessageSeries++;
+	return false;
+}
+
+// *************************************************************
+
+void FilterWithBufferedInput::BlockQueue::ResetQueue(size_t blockSize, size_t maxBlocks)
+{
+	m_buffer.New(blockSize * maxBlocks);
+	m_blockSize = blockSize;
+	m_maxBlocks = maxBlocks;
+	m_size = 0;
+	m_begin = m_buffer;
+}
+
+byte *FilterWithBufferedInput::BlockQueue::GetBlock()
+{
+	if (m_size >= m_blockSize)
+	{
+		byte *ptr = m_begin;
+		if ((m_begin+=m_blockSize) == m_buffer.end())
+			m_begin = m_buffer;
+		m_size -= m_blockSize;
+		return ptr;
+	}
+	else
+		return NULL;
+}
+
+byte *FilterWithBufferedInput::BlockQueue::GetContigousBlocks(size_t &numberOfBytes)
+{
+	numberOfBytes = STDMIN(numberOfBytes, STDMIN(size_t(m_buffer.end()-m_begin), m_size));
+	byte *ptr = m_begin;
+	m_begin += numberOfBytes;
+	m_size -= numberOfBytes;
+	if (m_size == 0 || m_begin == m_buffer.end())
+		m_begin = m_buffer;
+	return ptr;
+}
+
+size_t FilterWithBufferedInput::BlockQueue::GetAll(byte *outString)
+{
+	size_t size = m_size;
+	size_t numberOfBytes = m_maxBlocks*m_blockSize;
+	const byte *ptr = GetContigousBlocks(numberOfBytes);
+	memcpy(outString, ptr, numberOfBytes);
+	memcpy(outString+numberOfBytes, m_begin, m_size);
+	m_size = 0;
+	return size;
+}
+
+void FilterWithBufferedInput::BlockQueue::Put(const byte *inString, size_t length)
+{
+	assert(m_size + length <= m_buffer.size());
+	byte *end = (m_size < size_t(m_buffer.end()-m_begin)) ? m_begin + m_size : m_begin + m_size - m_buffer.size();
+	size_t len = STDMIN(length, size_t(m_buffer.end()-end));
+	memcpy(end, inString, len);
+	if (len < length)
+		memcpy(m_buffer, inString+len, length-len);
+	m_size += length;
+}
+
+FilterWithBufferedInput::FilterWithBufferedInput(BufferedTransformation *attachment)
+	: Filter(attachment)
+{
+}
+
+FilterWithBufferedInput::FilterWithBufferedInput(size_t firstSize, size_t blockSize, size_t lastSize, BufferedTransformation *attachment)
+	: Filter(attachment), m_firstSize(firstSize), m_blockSize(blockSize), m_lastSize(lastSize)
+	, m_firstInputDone(false)
+{
+	if (m_firstSize < 0 || m_blockSize < 1 || m_lastSize < 0)
+		throw InvalidArgument("FilterWithBufferedInput: invalid buffer size");
+
+	m_queue.ResetQueue(1, m_firstSize);
+}
+
+void FilterWithBufferedInput::IsolatedInitialize(const NameValuePairs &parameters)
+{
+	InitializeDerivedAndReturnNewSizes(parameters, m_firstSize, m_blockSize, m_lastSize);
+	if (m_firstSize < 0 || m_blockSize < 1 || m_lastSize < 0)
+		throw InvalidArgument("FilterWithBufferedInput: invalid buffer size");
+	m_queue.ResetQueue(1, m_firstSize);
+	m_firstInputDone = false;
+}
+
+bool FilterWithBufferedInput::IsolatedFlush(bool hardFlush, bool blocking)
+{
+	if (!blocking)
+		throw BlockingInputOnly("FilterWithBufferedInput");
+	
+	if (hardFlush)
+		ForceNextPut();
+	FlushDerived();
+	
+	return false;
+}
+
+size_t FilterWithBufferedInput::PutMaybeModifiable(byte *inString, size_t length, int messageEnd, bool blocking, bool modifiable)
+{
+	if (!blocking)
+		throw BlockingInputOnly("FilterWithBufferedInput");
+
+	if (length != 0)
+	{
+		size_t newLength = m_queue.CurrentSize() + length;
+
+		if (!m_firstInputDone && newLength >= m_firstSize)
+		{
+			size_t len = m_firstSize - m_queue.CurrentSize();
+			m_queue.Put(inString, len);
+			FirstPut(m_queue.GetContigousBlocks(m_firstSize));
+			assert(m_queue.CurrentSize() == 0);
+			m_queue.ResetQueue(m_blockSize, (2*m_blockSize+m_lastSize-2)/m_blockSize);
+
+			inString += len;
+			newLength -= m_firstSize;
+			m_firstInputDone = true;
+		}
+
+		if (m_firstInputDone)
+		{
+			if (m_blockSize == 1)
+			{
+				while (newLength > m_lastSize && m_queue.CurrentSize() > 0)
+				{
+					size_t len = newLength - m_lastSize;
+					byte *ptr = m_queue.GetContigousBlocks(len);
+					NextPutModifiable(ptr, len);
+					newLength -= len;
+				}
+
+				if (newLength > m_lastSize)
+				{
+					size_t len = newLength - m_lastSize;
+					NextPutMaybeModifiable(inString, len, modifiable);
+					inString += len;
+					newLength -= len;
+				}
+			}
+			else
+			{
+				while (newLength >= m_blockSize + m_lastSize && m_queue.CurrentSize() >= m_blockSize)
+				{
+					NextPutModifiable(m_queue.GetBlock(), m_blockSize);
+					newLength -= m_blockSize;
+				}
+
+				if (newLength >= m_blockSize + m_lastSize && m_queue.CurrentSize() > 0)
+				{
+					assert(m_queue.CurrentSize() < m_blockSize);
+					size_t len = m_blockSize - m_queue.CurrentSize();
+					m_queue.Put(inString, len);
+					inString += len;
+					NextPutModifiable(m_queue.GetBlock(), m_blockSize);
+					newLength -= m_blockSize;
+				}
+
+				if (newLength >= m_blockSize + m_lastSize)
+				{
+					size_t len = RoundDownToMultipleOf(newLength - m_lastSize, m_blockSize);
+					NextPutMaybeModifiable(inString, len, modifiable);
+					inString += len;
+					newLength -= len;
+				}
+			}
+		}
+
+		m_queue.Put(inString, newLength - m_queue.CurrentSize());
+	}
+
+	if (messageEnd)
+	{
+		if (!m_firstInputDone && m_firstSize==0)
+			FirstPut(NULL);
+
+		SecByteBlock temp(m_queue.CurrentSize());
+		m_queue.GetAll(temp);
+		LastPut(temp, temp.size());
+
+		m_firstInputDone = false;
+		m_queue.ResetQueue(1, m_firstSize);
+
+		Output(1, NULL, 0, messageEnd, blocking);
+	}
+	return 0;
+}
+
+void FilterWithBufferedInput::ForceNextPut()
+{
+	if (!m_firstInputDone)
+		return;
+	
+	if (m_blockSize > 1)
+	{
+		while (m_queue.CurrentSize() >= m_blockSize)
+			NextPutModifiable(m_queue.GetBlock(), m_blockSize);
+	}
+	else
+	{
+		size_t len;
+		while ((len = m_queue.CurrentSize()) > 0)
+			NextPutModifiable(m_queue.GetContigousBlocks(len), len);
+	}
+}
+
+void FilterWithBufferedInput::NextPutMultiple(const byte *inString, size_t length)
+{
+	assert(m_blockSize > 1);	// m_blockSize = 1 should always override this function
+	while (length > 0)
+	{
+		assert(length >= m_blockSize);
+		NextPutSingle(inString);
+		inString += m_blockSize;
+		length -= m_blockSize;
+	}
+}
+
+// *************************************************************
+
+void Redirector::Initialize(const NameValuePairs &parameters, int propagation)
+{
+	m_target = parameters.GetValueWithDefault("RedirectionTargetPointer", (BufferedTransformation*)NULL);
+	m_behavior = parameters.GetIntValueWithDefault("RedirectionBehavior", PASS_EVERYTHING);
+
+	if (m_target && GetPassSignals())
+		m_target->Initialize(parameters, propagation);
+}
+
+// *************************************************************
+
+ProxyFilter::ProxyFilter(BufferedTransformation *filter, size_t firstSize, size_t lastSize, BufferedTransformation *attachment)
+	: FilterWithBufferedInput(firstSize, 1, lastSize, attachment), m_filter(filter)
+{
+	if (m_filter.get())
+		m_filter->Attach(new OutputProxy(*this, false));
+}
+
+bool ProxyFilter::IsolatedFlush(bool hardFlush, bool blocking)
+{
+	return m_filter.get() ? m_filter->Flush(hardFlush, -1, blocking) : false;
+}
+
+void ProxyFilter::SetFilter(Filter *filter)
+{
+	m_filter.reset(filter);
+	if (filter)
+	{
+		OutputProxy *proxy;
+		std::auto_ptr<OutputProxy> temp(proxy = new OutputProxy(*this, false));
+		m_filter->TransferAllTo(*proxy);
+		m_filter->Attach(temp.release());
+	}
+}
+
+void ProxyFilter::NextPutMultiple(const byte *s, size_t len)
+{
+	if (m_filter.get())
+		m_filter->Put(s, len);
+}
+
+void ProxyFilter::NextPutModifiable(byte *s, size_t len)
+{
+	if (m_filter.get())
+		m_filter->PutModifiable(s, len);
+}
+
+// *************************************************************
+
+void RandomNumberSink::IsolatedInitialize(const NameValuePairs &parameters)
+{
+	parameters.GetRequiredParameter("RandomNumberSink", "RandomNumberGeneratorPointer", m_rng);
+}
+
+size_t RandomNumberSink::Put2(const byte *begin, size_t length, int messageEnd, bool blocking)
+{
+	m_rng->IncorporateEntropy(begin, length);
+	return 0;
+}
+
+size_t ArraySink::Put2(const byte *begin, size_t length, int messageEnd, bool blocking)
+{
+	if (m_buf+m_total != begin)
+		memcpy(m_buf+m_total, begin, STDMIN(length, SaturatingSubtract(m_size, m_total)));
+	m_total += length;
+	return 0;
+}
+
+byte * ArraySink::CreatePutSpace(size_t &size)
+{
+	size = SaturatingSubtract(m_size, m_total);
+	return m_buf + m_total;
+}
+
+void ArraySink::IsolatedInitialize(const NameValuePairs &parameters)
+{
+	ByteArrayParameter array;
+	if (!parameters.GetValue(Name::OutputBuffer(), array))
+		throw InvalidArgument("ArraySink: missing OutputBuffer argument");
+	m_buf = array.begin();
+	m_size = array.size();
+	m_total = 0;
+}
+
+size_t ArrayXorSink::Put2(const byte *begin, size_t length, int messageEnd, bool blocking)
+{
+	xorbuf(m_buf+m_total, begin, STDMIN(length, SaturatingSubtract(m_size, m_total)));
+	m_total += length;
+	return 0;
+}
+
+// *************************************************************
+
+StreamTransformationFilter::StreamTransformationFilter(StreamTransformation &c, BufferedTransformation *attachment, BlockPaddingScheme padding, bool allowAuthenticatedSymmetricCipher)
+   : FilterWithBufferedInput(attachment)
+	, m_cipher(c)
+{
+	assert(c.MinLastBlockSize() == 0 || c.MinLastBlockSize() > c.MandatoryBlockSize());
+
+	if (!allowAuthenticatedSymmetricCipher && dynamic_cast<AuthenticatedSymmetricCipher *>(&c) != 0)
+		throw InvalidArgument("StreamTransformationFilter: please use AuthenticatedEncryptionFilter and AuthenticatedDecryptionFilter for AuthenticatedSymmetricCipher");
+
+	IsolatedInitialize(MakeParameters(Name::BlockPaddingScheme(), padding));
+}
+
+size_t StreamTransformationFilter::LastBlockSize(StreamTransformation &c, BlockPaddingScheme padding)
+{
+	if (c.MinLastBlockSize() > 0)
+		return c.MinLastBlockSize();
+	else if (c.MandatoryBlockSize() > 1 && !c.IsForwardTransformation() && padding != NO_PADDING && padding != ZEROS_PADDING)
+		return c.MandatoryBlockSize();
+	else
+		return 0;
+}
+
+void StreamTransformationFilter::InitializeDerivedAndReturnNewSizes(const NameValuePairs &parameters, size_t &firstSize, size_t &blockSize, size_t &lastSize)
+{
+	BlockPaddingScheme padding = parameters.GetValueWithDefault(Name::BlockPaddingScheme(), DEFAULT_PADDING);
+	bool isBlockCipher = (m_cipher.MandatoryBlockSize() > 1 && m_cipher.MinLastBlockSize() == 0);
+
+	if (padding == DEFAULT_PADDING)
+		m_padding = isBlockCipher ? PKCS_PADDING : NO_PADDING;
+	else
+		m_padding = padding;
+
+	if (!isBlockCipher && (m_padding == PKCS_PADDING || m_padding == ONE_AND_ZEROS_PADDING))
+		throw InvalidArgument("StreamTransformationFilter: PKCS_PADDING and ONE_AND_ZEROS_PADDING cannot be used with " + m_cipher.AlgorithmName());
+
+	firstSize = 0;
+	blockSize = m_cipher.MandatoryBlockSize();
+	lastSize = LastBlockSize(m_cipher, m_padding);
+}
+
+void StreamTransformationFilter::FirstPut(const byte *inString)
+{
+	m_optimalBufferSize = m_cipher.OptimalBlockSize();
+	m_optimalBufferSize = (unsigned int)STDMAX(m_optimalBufferSize, RoundDownToMultipleOf(4096U, m_optimalBufferSize));
+}
+
+void StreamTransformationFilter::NextPutMultiple(const byte *inString, size_t length)
+{
+	if (!length)
+		return;
+
+	size_t s = m_cipher.MandatoryBlockSize();
+
+	do
+	{
+		size_t len = m_optimalBufferSize;
+		byte *space = HelpCreatePutSpace(*AttachedTransformation(), DEFAULT_CHANNEL, s, length, len);
+		if (len < length)
+		{
+			if (len == m_optimalBufferSize)
+				len -= m_cipher.GetOptimalBlockSizeUsed();
+			len = RoundDownToMultipleOf(len, s);
+		}
+		else
+			len = length;
+		m_cipher.ProcessString(space, inString, len);
+		AttachedTransformation()->PutModifiable(space, len);
+		inString += len;
+		length -= len;
+	}
+	while (length > 0);
+}
+
+void StreamTransformationFilter::NextPutModifiable(byte *inString, size_t length)
+{
+	m_cipher.ProcessString(inString, length);
+	AttachedTransformation()->PutModifiable(inString, length);
+}
+
+void StreamTransformationFilter::LastPut(const byte *inString, size_t length)
+{
+	byte *space = NULL;
+	
+	switch (m_padding)
+	{
+	case NO_PADDING:
+	case ZEROS_PADDING:
+		if (length > 0)
+		{
+			size_t minLastBlockSize = m_cipher.MinLastBlockSize();
+			bool isForwardTransformation = m_cipher.IsForwardTransformation();
+
+			if (isForwardTransformation && m_padding == ZEROS_PADDING && (minLastBlockSize == 0 || length < minLastBlockSize))
+			{
+				// do padding
+				size_t blockSize = STDMAX(minLastBlockSize, (size_t)m_cipher.MandatoryBlockSize());
+				space = HelpCreatePutSpace(*AttachedTransformation(), DEFAULT_CHANNEL, blockSize);
+				memcpy(space, inString, length);
+				memset(space + length, 0, blockSize - length);
+				m_cipher.ProcessLastBlock(space, space, blockSize);
+				AttachedTransformation()->Put(space, blockSize);
+			}
+			else
+			{
+				if (minLastBlockSize == 0)
+				{
+					if (isForwardTransformation)
+						throw InvalidDataFormat("StreamTransformationFilter: plaintext length is not a multiple of block size and NO_PADDING is specified");
+					else
+						throw InvalidCiphertext("StreamTransformationFilter: ciphertext length is not a multiple of block size");
+				}
+
+				space = HelpCreatePutSpace(*AttachedTransformation(), DEFAULT_CHANNEL, length, m_optimalBufferSize);
+				m_cipher.ProcessLastBlock(space, inString, length);
+				AttachedTransformation()->Put(space, length);
+			}
+		}
+		break;
+
+	case PKCS_PADDING:
+	case ONE_AND_ZEROS_PADDING:
+		unsigned int s;
+		s = m_cipher.MandatoryBlockSize();
+		assert(s > 1);
+		space = HelpCreatePutSpace(*AttachedTransformation(), DEFAULT_CHANNEL, s, m_optimalBufferSize);
+		if (m_cipher.IsForwardTransformation())
+		{
+			assert(length < s);
+			memcpy(space, inString, length);
+			if (m_padding == PKCS_PADDING)
+			{
+				assert(s < 256);
+				byte pad = byte(s-length);
+				memset(space+length, pad, s-length);
+			}
+			else
+			{
+				space[length] = 0x80;
+				memset(space+length+1, 0, s-length-1);
+			}
+			m_cipher.ProcessData(space, space, s);
+			AttachedTransformation()->Put(space, s);
+		}
+		else
+		{
+			if (length != s)
+				throw InvalidCiphertext("StreamTransformationFilter: ciphertext length is not a multiple of block size");
+			m_cipher.ProcessData(space, inString, s);
+			if (m_padding == PKCS_PADDING)
+			{
+				byte pad = space[s-1];
+				if (pad < 1 || pad > s || std::find_if(space+s-pad, space+s, std::bind2nd(std::not_equal_to<byte>(), pad)) != space+s)
+					throw InvalidCiphertext("StreamTransformationFilter: invalid PKCS #7 block padding found");
+				length = s-pad;
+			}
+			else
+			{
+				while (length > 1 && space[length-1] == 0)
+					--length;
+				if (space[--length] != 0x80)
+					throw InvalidCiphertext("StreamTransformationFilter: invalid ones-and-zeros padding found");
+			}
+			AttachedTransformation()->Put(space, length);
+		}
+		break;
+
+	default:
+		assert(false);
+	}
+}
+
+// *************************************************************
+
+HashFilter::HashFilter(HashTransformation &hm, BufferedTransformation *attachment, bool putMessage, int truncatedDigestSize, const std::string &messagePutChannel, const std::string &hashPutChannel)
+	: m_hashModule(hm), m_putMessage(putMessage), m_messagePutChannel(messagePutChannel), m_hashPutChannel(hashPutChannel)
+{
+	m_digestSize = truncatedDigestSize < 0 ? m_hashModule.DigestSize() : truncatedDigestSize;
+	Detach(attachment);
+}
+
+void HashFilter::IsolatedInitialize(const NameValuePairs &parameters)
+{
+	m_putMessage = parameters.GetValueWithDefault(Name::PutMessage(), false);
+	int s = parameters.GetIntValueWithDefault(Name::TruncatedDigestSize(), -1);
+	m_digestSize = s < 0 ? m_hashModule.DigestSize() : s;
+}
+
+size_t HashFilter::Put2(const byte *inString, size_t length, int messageEnd, bool blocking)
+{
+	FILTER_BEGIN;
+	if (m_putMessage)
+		FILTER_OUTPUT3(1, 0, inString, length, 0, m_messagePutChannel);
+	m_hashModule.Update(inString, length);
+	if (messageEnd)
+	{
+		{
+			size_t size;
+			m_space = HelpCreatePutSpace(*AttachedTransformation(), m_hashPutChannel, m_digestSize, m_digestSize, size = m_digestSize);
+			m_hashModule.TruncatedFinal(m_space, m_digestSize);
+		}
+		FILTER_OUTPUT3(2, 0, m_space, m_digestSize, messageEnd, m_hashPutChannel);
+	}
+	FILTER_END_NO_MESSAGE_END;
+}
+
+// *************************************************************
+
+HashVerificationFilter::HashVerificationFilter(HashTransformation &hm, BufferedTransformation *attachment, word32 flags, int truncatedDigestSize)
+	: FilterWithBufferedInput(attachment)
+	, m_hashModule(hm)
+{
+	IsolatedInitialize(MakeParameters(Name::HashVerificationFilterFlags(), flags)(Name::TruncatedDigestSize(), truncatedDigestSize));
+}
+
+void HashVerificationFilter::InitializeDerivedAndReturnNewSizes(const NameValuePairs &parameters, size_t &firstSize, size_t &blockSize, size_t &lastSize)
+{
+	m_flags = parameters.GetValueWithDefault(Name::HashVerificationFilterFlags(), (word32)DEFAULT_FLAGS);
+	int s = parameters.GetIntValueWithDefault(Name::TruncatedDigestSize(), -1);
+	m_digestSize = s < 0 ? m_hashModule.DigestSize() : s;
+	m_verified = false;
+	firstSize = m_flags & HASH_AT_BEGIN ? m_digestSize : 0;
+	blockSize = 1;
+	lastSize = m_flags & HASH_AT_BEGIN ? 0 : m_digestSize;
+}
+
+void HashVerificationFilter::FirstPut(const byte *inString)
+{
+	if (m_flags & HASH_AT_BEGIN)
+	{
+		m_expectedHash.New(m_digestSize);
+		memcpy(m_expectedHash, inString, m_expectedHash.size());
+		if (m_flags & PUT_HASH)
+			AttachedTransformation()->Put(inString, m_expectedHash.size());
+	}
+}
+
+void HashVerificationFilter::NextPutMultiple(const byte *inString, size_t length)
+{
+	m_hashModule.Update(inString, length);
+	if (m_flags & PUT_MESSAGE)
+		AttachedTransformation()->Put(inString, length);
+}
+
+void HashVerificationFilter::LastPut(const byte *inString, size_t length)
+{
+	if (m_flags & HASH_AT_BEGIN)
+	{
+		assert(length == 0);
+		m_verified = m_hashModule.TruncatedVerify(m_expectedHash, m_digestSize);
+	}
+	else
+	{
+		m_verified = (length==m_digestSize && m_hashModule.TruncatedVerify(inString, length));
+		if (m_flags & PUT_HASH)
+			AttachedTransformation()->Put(inString, length);
+	}
+
+	if (m_flags & PUT_RESULT)
+		AttachedTransformation()->Put(m_verified);
+
+	if ((m_flags & THROW_EXCEPTION) && !m_verified)
+		throw HashVerificationFailed();
+}
+
+// *************************************************************
+
+AuthenticatedEncryptionFilter::AuthenticatedEncryptionFilter(AuthenticatedSymmetricCipher &c, BufferedTransformation *attachment, 
+								bool putAAD, int truncatedDigestSize, const std::string &macChannel, BlockPaddingScheme padding)
+	: StreamTransformationFilter(c, attachment, padding, true)
+	, m_hf(c, new OutputProxy(*this, false), putAAD, truncatedDigestSize, AAD_CHANNEL, macChannel)
+{
+	assert(c.IsForwardTransformation());
+}
+
+void AuthenticatedEncryptionFilter::IsolatedInitialize(const NameValuePairs &parameters)
+{
+	m_hf.IsolatedInitialize(parameters);
+	StreamTransformationFilter::IsolatedInitialize(parameters);
+}
+
+byte * AuthenticatedEncryptionFilter::ChannelCreatePutSpace(const std::string &channel, size_t &size)
+{
+	if (channel.empty())
+		return StreamTransformationFilter::CreatePutSpace(size);
+
+	if (channel == AAD_CHANNEL)
+		return m_hf.CreatePutSpace(size);
+
+	throw InvalidChannelName("AuthenticatedEncryptionFilter", channel);
+}
+
+size_t AuthenticatedEncryptionFilter::ChannelPut2(const std::string &channel, const byte *begin, size_t length, int messageEnd, bool blocking)
+{
+	if (channel.empty())
+		return StreamTransformationFilter::Put2(begin, length, messageEnd, blocking);
+
+	if (channel == AAD_CHANNEL)
+		return m_hf.Put2(begin, length, 0, blocking);
+
+	throw InvalidChannelName("AuthenticatedEncryptionFilter", channel);
+}
+
+void AuthenticatedEncryptionFilter::LastPut(const byte *inString, size_t length)
+{
+	StreamTransformationFilter::LastPut(inString, length);
+	m_hf.MessageEnd();
+}
+
+// *************************************************************
+
+AuthenticatedDecryptionFilter::AuthenticatedDecryptionFilter(AuthenticatedSymmetricCipher &c, BufferedTransformation *attachment, word32 flags, int truncatedDigestSize, BlockPaddingScheme padding)
+	: FilterWithBufferedInput(attachment)
+	, m_hashVerifier(c, new OutputProxy(*this, false))
+	, m_streamFilter(c, new OutputProxy(*this, false), padding, true)
+{
+	assert(!c.IsForwardTransformation() || c.IsSelfInverting());
+	IsolatedInitialize(MakeParameters(Name::BlockPaddingScheme(), padding)(Name::AuthenticatedDecryptionFilterFlags(), flags)(Name::TruncatedDigestSize(), truncatedDigestSize));
+}
+
+void AuthenticatedDecryptionFilter::InitializeDerivedAndReturnNewSizes(const NameValuePairs &parameters, size_t &firstSize, size_t &blockSize, size_t &lastSize)
+{
+	word32 flags = parameters.GetValueWithDefault(Name::AuthenticatedDecryptionFilterFlags(), (word32)DEFAULT_FLAGS);
+
+	m_hashVerifier.Initialize(CombinedNameValuePairs(parameters, MakeParameters(Name::HashVerificationFilterFlags(), flags)));
+	m_streamFilter.Initialize(parameters);
+
+	firstSize = m_hashVerifier.m_firstSize;
+	blockSize = 1;
+	lastSize = m_hashVerifier.m_lastSize;
+}
+
+byte * AuthenticatedDecryptionFilter::ChannelCreatePutSpace(const std::string &channel, size_t &size)
+{
+	if (channel.empty())
+		return m_streamFilter.CreatePutSpace(size);
+
+	if (channel == AAD_CHANNEL)
+		return m_hashVerifier.CreatePutSpace(size);
+
+	throw InvalidChannelName("AuthenticatedDecryptionFilter", channel);
+}
+
+size_t AuthenticatedDecryptionFilter::ChannelPut2(const std::string &channel, const byte *begin, size_t length, int messageEnd, bool blocking)
+{
+	if (channel.empty())
+	{
+		if (m_lastSize > 0)
+			m_hashVerifier.ForceNextPut();
+		return FilterWithBufferedInput::Put2(begin, length, messageEnd, blocking);
+	}
+
+	if (channel == AAD_CHANNEL)
+		return m_hashVerifier.Put2(begin, length, 0, blocking);
+
+	throw InvalidChannelName("AuthenticatedDecryptionFilter", channel);
+}
+
+void AuthenticatedDecryptionFilter::FirstPut(const byte *inString)
+{
+	m_hashVerifier.Put(inString, m_firstSize);
+}
+
+void AuthenticatedDecryptionFilter::NextPutMultiple(const byte *inString, size_t length)
+{
+	m_streamFilter.Put(inString, length);
+}
+
+void AuthenticatedDecryptionFilter::LastPut(const byte *inString, size_t length)
+{
+	m_streamFilter.MessageEnd();
+	m_hashVerifier.PutMessageEnd(inString, length);
+}
+
+// *************************************************************
+
+void SignerFilter::IsolatedInitialize(const NameValuePairs &parameters)
+{
+	m_putMessage = parameters.GetValueWithDefault(Name::PutMessage(), false);
+	m_messageAccumulator.reset(m_signer.NewSignatureAccumulator(m_rng));
+}
+
+size_t SignerFilter::Put2(const byte *inString, size_t length, int messageEnd, bool blocking)
+{
+	FILTER_BEGIN;
+	m_messageAccumulator->Update(inString, length);
+	if (m_putMessage)
+		FILTER_OUTPUT(1, inString, length, 0);
+	if (messageEnd)
+	{
+		m_buf.New(m_signer.SignatureLength());
+		m_signer.Sign(m_rng, m_messageAccumulator.release(), m_buf);
+		FILTER_OUTPUT(2, m_buf, m_buf.size(), messageEnd);
+		m_messageAccumulator.reset(m_signer.NewSignatureAccumulator(m_rng));
+	}
+	FILTER_END_NO_MESSAGE_END;
+}
+
+SignatureVerificationFilter::SignatureVerificationFilter(const PK_Verifier &verifier, BufferedTransformation *attachment, word32 flags)
+	: FilterWithBufferedInput(attachment)
+	, m_verifier(verifier)
+{
+	IsolatedInitialize(MakeParameters(Name::SignatureVerificationFilterFlags(), flags));
+}
+
+void SignatureVerificationFilter::InitializeDerivedAndReturnNewSizes(const NameValuePairs &parameters, size_t &firstSize, size_t &blockSize, size_t &lastSize)
+{
+	m_flags = parameters.GetValueWithDefault(Name::SignatureVerificationFilterFlags(), (word32)DEFAULT_FLAGS);
+	m_messageAccumulator.reset(m_verifier.NewVerificationAccumulator());
+	size_t size = m_verifier.SignatureLength();
+	assert(size != 0);	// TODO: handle recoverable signature scheme
+	m_verified = false;
+	firstSize = m_flags & SIGNATURE_AT_BEGIN ? size : 0;
+	blockSize = 1;
+	lastSize = m_flags & SIGNATURE_AT_BEGIN ? 0 : size;
+}
+
+void SignatureVerificationFilter::FirstPut(const byte *inString)
+{
+	if (m_flags & SIGNATURE_AT_BEGIN)
+	{
+		if (m_verifier.SignatureUpfront())
+			m_verifier.InputSignature(*m_messageAccumulator, inString, m_verifier.SignatureLength());
+		else
+		{
+			m_signature.New(m_verifier.SignatureLength());
+			memcpy(m_signature, inString, m_signature.size());
+		}
+
+		if (m_flags & PUT_SIGNATURE)
+			AttachedTransformation()->Put(inString, m_signature.size());
+	}
+	else
+	{
+		assert(!m_verifier.SignatureUpfront());
+	}
+}
+
+void SignatureVerificationFilter::NextPutMultiple(const byte *inString, size_t length)
+{
+	m_messageAccumulator->Update(inString, length);
+	if (m_flags & PUT_MESSAGE)
+		AttachedTransformation()->Put(inString, length);
+}
+
+void SignatureVerificationFilter::LastPut(const byte *inString, size_t length)
+{
+	if (m_flags & SIGNATURE_AT_BEGIN)
+	{
+		assert(length == 0);
+		m_verifier.InputSignature(*m_messageAccumulator, m_signature, m_signature.size());
+		m_verified = m_verifier.VerifyAndRestart(*m_messageAccumulator);
+	}
+	else
+	{
+		m_verifier.InputSignature(*m_messageAccumulator, inString, length);
+		m_verified = m_verifier.VerifyAndRestart(*m_messageAccumulator);
+		if (m_flags & PUT_SIGNATURE)
+			AttachedTransformation()->Put(inString, length);
+	}
+
+	if (m_flags & PUT_RESULT)
+		AttachedTransformation()->Put(m_verified);
+
+	if ((m_flags & THROW_EXCEPTION) && !m_verified)
+		throw SignatureVerificationFailed();
+}
+
+// *************************************************************
+
+size_t Source::PumpAll2(bool blocking)
+{
+	unsigned int messageCount = UINT_MAX;
+	do {
+		RETURN_IF_NONZERO(PumpMessages2(messageCount, blocking));
+	} while(messageCount == UINT_MAX);
+
+	return 0;
+}
+
+bool Store::GetNextMessage()
+{
+	if (!m_messageEnd && !AnyRetrievable())
+	{
+		m_messageEnd=true;
+		return true;
+	}
+	else
+		return false;
+}
+
+unsigned int Store::CopyMessagesTo(BufferedTransformation &target, unsigned int count, const std::string &channel) const
+{
+	if (m_messageEnd || count == 0)
+		return 0;
+	else
+	{
+		CopyTo(target, ULONG_MAX, channel);
+		if (GetAutoSignalPropagation())
+			target.ChannelMessageEnd(channel, GetAutoSignalPropagation()-1);
+		return 1;
+	}
+}
+
+void StringStore::StoreInitialize(const NameValuePairs &parameters)
+{
+	ConstByteArrayParameter array;
+	if (!parameters.GetValue(Name::InputBuffer(), array))
+		throw InvalidArgument("StringStore: missing InputBuffer argument");
+	m_store = array.begin();
+	m_length = array.size();
+	m_count = 0;
+}
+
+size_t StringStore::TransferTo2(BufferedTransformation &target, lword &transferBytes, const std::string &channel, bool blocking)
+{
+	lword position = 0;
+	size_t blockedBytes = CopyRangeTo2(target, position, transferBytes, channel, blocking);
+	m_count += (size_t)position;
+	transferBytes = position;
+	return blockedBytes;
+}
+
+size_t StringStore::CopyRangeTo2(BufferedTransformation &target, lword &begin, lword end, const std::string &channel, bool blocking) const
+{
+	size_t i = UnsignedMin(m_length, m_count+begin);
+	size_t len = UnsignedMin(m_length-i, end-begin);
+	size_t blockedBytes = target.ChannelPut2(channel, m_store+i, len, 0, blocking);
+	if (!blockedBytes)
+		begin += len;
+	return blockedBytes;
+}
+
+void RandomNumberStore::StoreInitialize(const NameValuePairs &parameters)
+{
+	parameters.GetRequiredParameter("RandomNumberStore", "RandomNumberGeneratorPointer", m_rng);
+	int length;
+	parameters.GetRequiredIntParameter("RandomNumberStore", "RandomNumberStoreSize", length);
+	m_length = length;
+}
+
+size_t RandomNumberStore::TransferTo2(BufferedTransformation &target, lword &transferBytes, const std::string &channel, bool blocking)
+{
+	if (!blocking)
+		throw NotImplemented("RandomNumberStore: nonblocking transfer is not implemented by this object");
+
+	transferBytes = UnsignedMin(transferBytes, m_length - m_count);
+	m_rng->GenerateIntoBufferedTransformation(target, channel, transferBytes);
+	m_count += transferBytes;
+
+	return 0;
+}
+
+size_t NullStore::CopyRangeTo2(BufferedTransformation &target, lword &begin, lword end, const std::string &channel, bool blocking) const
+{
+	static const byte nullBytes[128] = {0};
+	while (begin < end)
+	{
+		size_t len = (size_t)STDMIN(end-begin, lword(128));
+		size_t blockedBytes = target.ChannelPut2(channel, nullBytes, len, 0, blocking);
+		if (blockedBytes)
+			return blockedBytes;
+		begin += len;
+	}
+	return 0;
+}
+
+size_t NullStore::TransferTo2(BufferedTransformation &target, lword &transferBytes, const std::string &channel, bool blocking)
+{
+	lword begin = 0;
+	size_t blockedBytes = NullStore::CopyRangeTo2(target, begin, transferBytes, channel, blocking);
+	transferBytes = begin;
+	m_size -= begin;
+	return blockedBytes;
+}
+
+NAMESPACE_END
+
+#endif