From b21162cf8e06f40baa1f58be6a8c17435cebc34d Mon Sep 17 00:00:00 2001 From: weidai Date: Fri, 4 Oct 2002 17:31:41 +0000 Subject: Initial revision git-svn-id: svn://svn.code.sf.net/p/cryptopp/code/trunk/c5@2 57ff6487-cd31-0410-9ec3-f628ee90f5f0 --- filters.cpp | 898 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 898 insertions(+) create mode 100644 filters.cpp (limited to 'filters.cpp') diff --git a/filters.cpp b/filters.cpp new file mode 100644 index 0000000..78e6b3c --- /dev/null +++ b/filters.cpp @@ -0,0 +1,898 @@ +// filters.cpp - written and placed in the public domain by Wei Dai + +#include "pch.h" +#include "filters.h" +#include "mqueue.h" +#include "fltrimpl.h" +#include "argnames.h" +#include +#include + +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(this)->m_attachment.reset(NewDefaultAttachment()); + return m_attachment.get(); +} + +void Filter::Detach(BufferedTransformation *newOut) +{ + m_attachment.reset(newOut); + NotifyAttachmentChange(); +} + +void Filter::Insert(Filter *filter) +{ + filter->m_attachment.reset(m_attachment.release()); + m_attachment.reset(filter); + NotifyAttachmentChange(); +} + +unsigned int Filter::CopyRangeTo2(BufferedTransformation &target, unsigned long &begin, unsigned long end, const std::string &channel, bool blocking) const +{ + return AttachedTransformation()->CopyRangeTo2(target, begin, end, channel, blocking); +} + +unsigned int Filter::TransferTo2(BufferedTransformation &target, unsigned long &transferBytes, const std::string &channel, bool blocking) +{ + return AttachedTransformation()->TransferTo2(target, transferBytes, channel, blocking); +} + +void Filter::Initialize(const NameValuePairs ¶meters, 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 ¶meters, int propagation, const std::string &channel) +{ + if (propagation) + AttachedTransformation()->ChannelInitialize(channel, parameters, propagation-1); +} + +unsigned int Filter::Output(int outputSite, const byte *inString, unsigned int length, int messageEnd, bool blocking, const std::string &channel) +{ + if (messageEnd) + messageEnd--; + unsigned int result = AttachedTransformation()->Put2(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; +} + +// ************************************************************* + +unsigned int MeterFilter::Put2(const byte *begin, unsigned int length, int messageEnd, bool blocking) +{ + FILTER_BEGIN; + m_currentMessageBytes += length; + m_totalBytes += length; + + if (messageEnd) + { + m_currentMessageBytes = 0; + m_currentSeriesMessages++; + m_totalMessages++; + } + + FILTER_OUTPUT(1, begin, length, messageEnd); + FILTER_END; +} + +bool MeterFilter::IsolatedMessageSeriesEnd(bool blocking) +{ + m_currentMessageBytes = 0; + m_currentSeriesMessages = 0; + m_totalMessageSeries++; + return false; +} + +// ************************************************************* + +void FilterWithBufferedInput::BlockQueue::ResetQueue(unsigned int blockSize, unsigned int 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(unsigned int &numberOfBytes) +{ + numberOfBytes = STDMIN(numberOfBytes, STDMIN((unsigned int)(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; +} + +unsigned int FilterWithBufferedInput::BlockQueue::GetAll(byte *outString) +{ + unsigned int size = m_size; + unsigned int 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, unsigned int length) +{ + assert(m_size + length <= m_buffer.size()); + byte *end = (m_size < (unsigned int)(m_buffer.end()-m_begin)) ? m_begin + m_size : m_begin + m_size - m_buffer.size(); + unsigned int len = STDMIN(length, (unsigned int)(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(unsigned int firstSize, unsigned int blockSize, unsigned int 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 ¶meters) +{ + 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; +} + +unsigned int FilterWithBufferedInput::PutMaybeModifiable(byte *inString, unsigned int length, int messageEnd, bool blocking, bool modifiable) +{ + if (!blocking) + throw BlockingInputOnly("FilterWithBufferedInput"); + + if (length != 0) + { + unsigned int newLength = m_queue.CurrentSize() + length; + + if (!m_firstInputDone && newLength >= m_firstSize) + { + unsigned int 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) + { + unsigned int len = newLength - m_lastSize; + byte *ptr = m_queue.GetContigousBlocks(len); + NextPutModifiable(ptr, len); + newLength -= len; + } + + if (newLength > m_lastSize) + { + unsigned int 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); + unsigned int 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) + { + unsigned int 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 + { + unsigned int len; + while ((len = m_queue.CurrentSize()) > 0) + NextPutModifiable(m_queue.GetContigousBlocks(len), len); + } +} + +void FilterWithBufferedInput::NextPutMultiple(const byte *inString, unsigned int 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::ChannelInitialize(const std::string &channel, const NameValuePairs ¶meters, int propagation) +{ + if (channel.empty()) + { + m_target = parameters.GetValueWithDefault("RedirectionTargetPointer", (BufferedTransformation*)NULL); + m_passSignal = parameters.GetValueWithDefault("PassSignal", true); + } + + if (m_target && m_passSignal) + m_target->ChannelInitialize(channel, parameters, propagation); +} + +// ************************************************************* + +ProxyFilter::ProxyFilter(BufferedTransformation *filter, unsigned int firstSize, unsigned int lastSize, BufferedTransformation *attachment) + : FilterWithBufferedInput(firstSize, 1, lastSize, attachment), m_filter(filter), m_proxy(NULL) +{ + if (m_filter.get()) + m_filter->Attach(m_proxy = new OutputProxy(*this, false)); +} + +void ProxyFilter::IsolatedFlush(bool completeFlush) +{ + if (m_filter.get()) + { + bool passSignal = m_proxy->GetPassSignal(); + m_proxy->SetPassSignal(false); + m_filter->Flush(completeFlush, -1); + m_proxy->SetPassSignal(passSignal); + } +} + +void ProxyFilter::SetFilter(Filter *filter) +{ + bool passSignal = m_proxy ? m_proxy->GetPassSignal() : false; + m_filter.reset(filter); + if (filter) + { + std::auto_ptr temp(m_proxy = new OutputProxy(*this, passSignal)); + m_filter->TransferAllTo(*m_proxy); + m_filter->Attach(temp.release()); + } + else + m_proxy=NULL; +} + +void ProxyFilter::NextPutMultiple(const byte *s, unsigned int len) +{ + if (m_filter.get()) + m_filter->Put(s, len); +} + +// ************************************************************* + +unsigned int ArraySink::Put2(const byte *begin, unsigned int length, int messageEnd, bool blocking) +{ + memcpy(m_buf+m_total, begin, STDMIN(length, SaturatingSubtract(m_size, m_total))); + m_total += length; + return 0; +} + +byte * ArraySink::CreatePutSpace(unsigned int &size) +{ + size = m_size - m_total; + return m_buf + m_total; +} + +void ArraySink::IsolatedInitialize(const NameValuePairs ¶meters) +{ + 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; +} + +unsigned int ArrayXorSink::Put2(const byte *begin, unsigned int length, int messageEnd, bool blocking) +{ + xorbuf(m_buf+m_total, begin, STDMIN(length, SaturatingSubtract(m_size, m_total))); + m_total += length; + return 0; +} + +// ************************************************************* + +unsigned int 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; +} + +StreamTransformationFilter::StreamTransformationFilter(StreamTransformation &c, BufferedTransformation *attachment, BlockPaddingScheme padding) + : FilterWithBufferedInput(0, c.MandatoryBlockSize(), LastBlockSize(c, padding), attachment) + , m_cipher(c) +{ + assert(c.MinLastBlockSize() == 0 || c.MinLastBlockSize() > c.MandatoryBlockSize()); + + bool isBlockCipher = (c.MandatoryBlockSize() > 1 && c.MinLastBlockSize() == 0); + + if (padding == DEFAULT_PADDING) + { + if (isBlockCipher) + m_padding = PKCS_PADDING; + else + m_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 " + c.AlgorithmName()); +} + +void StreamTransformationFilter::FirstPut(const byte *inString) +{ + m_optimalBufferSize = m_cipher.OptimalBlockSize(); + m_optimalBufferSize = STDMAX(m_optimalBufferSize, RoundDownToMultipleOf(4096U, m_optimalBufferSize)); +} + +void StreamTransformationFilter::NextPutMultiple(const byte *inString, unsigned int length) +{ + if (!length) + return; + + unsigned int s = m_cipher.MandatoryBlockSize(); + + do + { + unsigned int len = m_optimalBufferSize; + byte *space = HelpCreatePutSpace(*AttachedTransformation(), NULL_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, unsigned int length) +{ + m_cipher.ProcessString(inString, length); + AttachedTransformation()->PutModifiable(inString, length); +} + +void StreamTransformationFilter::LastPut(const byte *inString, unsigned int length) +{ + byte *space = NULL; + + switch (m_padding) + { + case NO_PADDING: + case ZEROS_PADDING: + if (length > 0) + { + unsigned int minLastBlockSize = m_cipher.MinLastBlockSize(); + bool isForwardTransformation = m_cipher.IsForwardTransformation(); + + if (isForwardTransformation && m_padding == ZEROS_PADDING && (minLastBlockSize == 0 || length < minLastBlockSize)) + { + // do padding + unsigned int blockSize = STDMAX(minLastBlockSize, m_cipher.MandatoryBlockSize()); + space = HelpCreatePutSpace(*AttachedTransformation(), NULL_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(), NULL_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(), NULL_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 = s-length; + memset(space+length, pad, s-length); + } + else + { + space[length] = 1; + 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(), 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] != '\1') + throw InvalidCiphertext("StreamTransformationFilter: invalid ones-and-zeros padding found"); + } + AttachedTransformation()->Put(space, length); + } + break; + + default: + assert(false); + } +} + +// ************************************************************* + +void HashFilter::IsolatedInitialize(const NameValuePairs ¶meters) +{ + m_putMessage = parameters.GetValueWithDefault(Name::PutMessage(), false); + m_hashModule.Restart(); +} + +unsigned int HashFilter::Put2(const byte *inString, unsigned int length, int messageEnd, bool blocking) +{ + FILTER_BEGIN; + m_hashModule.Update(inString, length); + if (m_putMessage) + FILTER_OUTPUT(1, inString, length, 0); + if (messageEnd) + { + { + unsigned int size, digestSize = m_hashModule.DigestSize(); + m_space = HelpCreatePutSpace(*AttachedTransformation(), NULL_CHANNEL, digestSize, digestSize, size = digestSize); + m_hashModule.Final(m_space); + } + FILTER_OUTPUT(2, m_space, m_hashModule.DigestSize(), messageEnd); + } + FILTER_END_NO_MESSAGE_END; +} + +// ************************************************************* + +HashVerificationFilter::HashVerificationFilter(HashTransformation &hm, BufferedTransformation *attachment, word32 flags) + : FilterWithBufferedInput(attachment) + , m_hashModule(hm) +{ + IsolatedInitialize(MakeParameters(Name::HashVerificationFilterFlags(), flags)); +} + +void HashVerificationFilter::InitializeDerivedAndReturnNewSizes(const NameValuePairs ¶meters, unsigned int &firstSize, unsigned int &blockSize, unsigned int &lastSize) +{ + m_flags = parameters.GetValueWithDefault(Name::HashVerificationFilterFlags(), (word32)DEFAULT_FLAGS); + m_hashModule.Restart(); + unsigned int size = m_hashModule.DigestSize(); + m_verified = false; + firstSize = m_flags & HASH_AT_BEGIN ? size : 0; + blockSize = 1; + lastSize = m_flags & HASH_AT_BEGIN ? 0 : size; +} + +void HashVerificationFilter::FirstPut(const byte *inString) +{ + if (m_flags & HASH_AT_BEGIN) + { + m_expectedHash.New(m_hashModule.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, unsigned int length) +{ + m_hashModule.Update(inString, length); + if (m_flags & PUT_MESSAGE) + AttachedTransformation()->Put(inString, length); +} + +void HashVerificationFilter::LastPut(const byte *inString, unsigned int length) +{ + if (m_flags & HASH_AT_BEGIN) + { + assert(length == 0); + m_verified = m_hashModule.Verify(m_expectedHash); + } + else + { + m_verified = (length==m_hashModule.DigestSize() && m_hashModule.Verify(inString)); + 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(); +} + +// ************************************************************* + +void SignerFilter::IsolatedInitialize(const NameValuePairs ¶meters) +{ + m_putMessage = parameters.GetValueWithDefault(Name::PutMessage(), false); + m_messageAccumulator.reset(m_signer.NewSignatureAccumulator()); +} + +unsigned int SignerFilter::Put2(const byte *inString, unsigned int 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()); + } + 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 ¶meters, unsigned int &firstSize, unsigned int &blockSize, unsigned int &lastSize) +{ + m_flags = parameters.GetValueWithDefault(Name::SignatureVerificationFilterFlags(), (word32)DEFAULT_FLAGS); + m_messageAccumulator.reset(m_verifier.NewVerificationAccumulator()); + unsigned int size = m_verifier.SignatureLength(); + 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.SignatureUpfrontForVerification()) + m_verifier.InitializeVerificationAccumulator(*m_messageAccumulator, inString); + 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.SignatureUpfrontForVerification()); + } +} + +void SignatureVerificationFilter::NextPutMultiple(const byte *inString, unsigned int length) +{ + m_messageAccumulator->Update(inString, length); + if (m_flags & PUT_MESSAGE) + AttachedTransformation()->Put(inString, length); +} + +void SignatureVerificationFilter::LastPut(const byte *inString, unsigned int length) +{ + if (m_flags & SIGNATURE_AT_BEGIN) + { + assert(length == 0); + m_verified = m_verifier.Verify(m_messageAccumulator.release(), m_signature); + } + else + { + m_verified = (length==m_verifier.SignatureLength() && m_verifier.Verify(m_messageAccumulator.release(), inString)); + 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(); +} + +// ************************************************************* + +unsigned int Source::PumpAll2(bool blocking) +{ + // TODO: switch length type + unsigned long i = UINT_MAX; + RETURN_IF_NONZERO(Pump2(i, blocking)); + unsigned int j = UINT_MAX; + return PumpMessages2(j, blocking); +} + +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 ¶meters) +{ + 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; +} + +unsigned int StringStore::TransferTo2(BufferedTransformation &target, unsigned long &transferBytes, const std::string &channel, bool blocking) +{ + unsigned long position = 0; + unsigned int blockedBytes = CopyRangeTo2(target, position, transferBytes, channel, blocking); + m_count += position; + transferBytes = position; + return blockedBytes; +} + +unsigned int StringStore::CopyRangeTo2(BufferedTransformation &target, unsigned long &begin, unsigned long end, const std::string &channel, bool blocking) const +{ + unsigned int i = (unsigned int)STDMIN((unsigned long)m_count+begin, (unsigned long)m_length); + unsigned int len = (unsigned int)STDMIN((unsigned long)m_length-i, end-begin); + unsigned int blockedBytes = target.ChannelPut2(channel, m_store+i, len, 0, blocking); + if (!blockedBytes) + begin += len; + return blockedBytes; +} + +unsigned int RandomNumberStore::TransferTo2(BufferedTransformation &target, unsigned long &transferBytes, const std::string &channel, bool blocking) +{ + if (!blocking) + throw NotImplemented("RandomNumberStore: nonblocking transfer is not implemented by this object"); + + unsigned long transferMax = transferBytes; + for (transferBytes = 0; transferBytes