// cryptlib.cpp - written and placed in the public domain by Wei Dai

#include "pch.h"

#ifndef CRYPTOPP_IMPORTS

#include "cryptlib.h"
#include "misc.h"
#include "filters.h"
#include "algparam.h"
#include "fips140.h"
#include "argnames.h"
#include "fltrimpl.h"

#include <memory>

NAMESPACE_BEGIN(CryptoPP)

CRYPTOPP_COMPILE_ASSERT(sizeof(byte) == 1);
CRYPTOPP_COMPILE_ASSERT(sizeof(word16) == 2);
CRYPTOPP_COMPILE_ASSERT(sizeof(word32) == 4);
#ifdef WORD64_AVAILABLE
CRYPTOPP_COMPILE_ASSERT(sizeof(word64) == 8);
#endif
#ifdef CRYPTOPP_NATIVE_DWORD_AVAILABLE
CRYPTOPP_COMPILE_ASSERT(sizeof(dword) == 2*sizeof(word));
#endif

const std::string BufferedTransformation::NULL_CHANNEL;
const NullNameValuePairs g_nullNameValuePairs;

BufferedTransformation & TheBitBucket()
{
	static BitBucket bitBucket;
	return bitBucket;
}

Algorithm::Algorithm(bool checkSelfTestStatus)
{
	if (checkSelfTestStatus && FIPS_140_2_ComplianceEnabled())
	{
		if (GetPowerUpSelfTestStatus() == POWER_UP_SELF_TEST_NOT_DONE && !PowerUpSelfTestInProgressOnThisThread())
			throw SelfTestFailure("Cryptographic algorithms are disabled before the power-up self tests are performed.");

		if (GetPowerUpSelfTestStatus() == POWER_UP_SELF_TEST_FAILED)
			throw SelfTestFailure("Cryptographic algorithms are disabled after a power-up self test failed.");
	}
}

void SimpleKeyingInterface::SetKeyWithRounds(const byte *key, unsigned int length, int rounds)
{
	SetKey(key, length, MakeParameters(Name::Rounds(), rounds));
}

void SimpleKeyingInterface::SetKeyWithIV(const byte *key, unsigned int length, const byte *iv)
{
	SetKey(key, length, MakeParameters(Name::IV(), iv));
}

void SimpleKeyingInterface::ThrowIfInvalidKeyLength(const Algorithm &algorithm, unsigned int length)
{
	if (!IsValidKeyLength(length))
		throw InvalidKeyLength(algorithm.AlgorithmName(), length);
}

void SimpleKeyingInterface::ThrowIfResynchronizable()
{
	if (IsResynchronizable())
		throw InvalidArgument("SimpleKeyingInterface: this object requires an IV");
}

void SimpleKeyingInterface::ThrowIfInvalidIV(const byte *iv)
{
	if (!iv && !(IVRequirement() == INTERNALLY_GENERATED_IV || IVRequirement() == STRUCTURED_IV || !IsResynchronizable()))
		throw InvalidArgument("SimpleKeyingInterface: this object cannot use a null IV");
}

const byte * SimpleKeyingInterface::GetIVAndThrowIfInvalid(const NameValuePairs &params)
{
	const byte *iv;
	if (params.GetValue(Name::IV(), iv))
		ThrowIfInvalidIV(iv);
	else
		ThrowIfResynchronizable();
	return iv;
}

void BlockTransformation::ProcessAndXorMultipleBlocks(const byte *inBlocks, const byte *xorBlocks, byte *outBlocks, unsigned int numberOfBlocks) const
{
	unsigned int blockSize = BlockSize();
	while (numberOfBlocks--)
	{
		ProcessAndXorBlock(inBlocks, xorBlocks, outBlocks);
		inBlocks += blockSize;
		outBlocks += blockSize;
		if (xorBlocks)
			xorBlocks += blockSize;
	}
}

void StreamTransformation::ProcessLastBlock(byte *outString, const byte *inString, unsigned int length)
{
	assert(MinLastBlockSize() == 0);	// this function should be overriden otherwise

	if (length == MandatoryBlockSize())
		ProcessData(outString, inString, length);
	else if (length != 0)
		throw NotImplemented("StreamTransformation: this object does't support a special last block");
}

unsigned int RandomNumberGenerator::GenerateBit()
{
	return Parity(GenerateByte());
}

void RandomNumberGenerator::GenerateBlock(byte *output, unsigned int size)
{
	while (size--)
		*output++ = GenerateByte();
}

word32 RandomNumberGenerator::GenerateWord32(word32 min, word32 max)
{
	word32 range = max-min;
	const int maxBytes = BytePrecision(range);
	const int maxBits = BitPrecision(range);

	word32 value;

	do
	{
		value = 0;
		for (int i=0; i<maxBytes; i++)
			value = (value << 8) | GenerateByte();

		value = Crop(value, maxBits);
	} while (value > range);

	return value+min;
}

void RandomNumberGenerator::DiscardBytes(unsigned int n)
{
	while (n--)
		GenerateByte();
}

//! see NullRNG()
class ClassNullRNG : public RandomNumberGenerator
{
public:
	std::string AlgorithmName() const {return "NullRNG";}
	byte GenerateByte() {throw NotImplemented("NullRNG: NullRNG should only be passed to functions that don't need to generate random bytes");}
};

RandomNumberGenerator & NullRNG()
{
	static ClassNullRNG s_nullRNG;
	return s_nullRNG;
}

bool HashTransformation::TruncatedVerify(const byte *digestIn, unsigned int digestLength)
{
	ThrowIfInvalidTruncatedSize(digestLength);
	SecByteBlock digest(digestLength);
	TruncatedFinal(digest, digestLength);
	return memcmp(digest, digestIn, digestLength) == 0;
}

void HashTransformation::ThrowIfInvalidTruncatedSize(unsigned int size) const
{
	if (size > DigestSize())
		throw InvalidArgument("HashTransformation: can't truncate a " + IntToString(DigestSize()) + " byte digest to " + IntToString(size) + " bytes");
}

unsigned int BufferedTransformation::GetMaxWaitObjectCount() const
{
	const BufferedTransformation *t = AttachedTransformation();
	return t ? t->GetMaxWaitObjectCount() : 0;
}

void BufferedTransformation::GetWaitObjects(WaitObjectContainer &container)
{
	BufferedTransformation *t = AttachedTransformation();
	if (t)
		t->GetWaitObjects(container);
}

void BufferedTransformation::Initialize(const NameValuePairs &parameters, int propagation)
{
	assert(!AttachedTransformation());
	IsolatedInitialize(parameters);
}

bool BufferedTransformation::Flush(bool hardFlush, int propagation, bool blocking)
{
	assert(!AttachedTransformation());
	return IsolatedFlush(hardFlush, blocking);
}

bool BufferedTransformation::MessageSeriesEnd(int propagation, bool blocking)
{
	assert(!AttachedTransformation());
	return IsolatedMessageSeriesEnd(blocking);
}

byte * BufferedTransformation::ChannelCreatePutSpace(const std::string &channel, unsigned int &size)
{
	if (channel.empty())
		return CreatePutSpace(size);
	else
		throw NoChannelSupport();
}

unsigned int BufferedTransformation::ChannelPut2(const std::string &channel, const byte *begin, unsigned int length, int messageEnd, bool blocking)
{
	if (channel.empty())
		return Put2(begin, length, messageEnd, blocking);
	else
		throw NoChannelSupport();
}

unsigned int BufferedTransformation::ChannelPutModifiable2(const std::string &channel, byte *begin, unsigned int length, int messageEnd, bool blocking)
{
	if (channel.empty())
		return PutModifiable2(begin, length, messageEnd, blocking);
	else
		return ChannelPut2(channel, begin, length, messageEnd, blocking);
}

bool BufferedTransformation::ChannelFlush(const std::string &channel, bool completeFlush, int propagation, bool blocking)
{
	if (channel.empty())
		return Flush(completeFlush, propagation, blocking);
	else
		throw NoChannelSupport();
}

bool BufferedTransformation::ChannelMessageSeriesEnd(const std::string &channel, int propagation, bool blocking)
{
	if (channel.empty())
		return MessageSeriesEnd(propagation, blocking);
	else
		throw NoChannelSupport();
}

unsigned long BufferedTransformation::MaxRetrievable() const
{
	if (AttachedTransformation())
		return AttachedTransformation()->MaxRetrievable();
	else
		return CopyTo(TheBitBucket());
}

bool BufferedTransformation::AnyRetrievable() const
{
	if (AttachedTransformation())
		return AttachedTransformation()->AnyRetrievable();
	else
	{
		byte b;
		return Peek(b) != 0;
	}
}

unsigned int BufferedTransformation::Get(byte &outByte)
{
	if (AttachedTransformation())
		return AttachedTransformation()->Get(outByte);
	else
		return Get(&outByte, 1);
}

unsigned int BufferedTransformation::Get(byte *outString, unsigned int getMax)
{
	if (AttachedTransformation())
		return AttachedTransformation()->Get(outString, getMax);
	else
	{
		ArraySink arraySink(outString, getMax);
		return TransferTo(arraySink, getMax);
	}
}

unsigned int BufferedTransformation::Peek(byte &outByte) const
{
	if (AttachedTransformation())
		return AttachedTransformation()->Peek(outByte);
	else
		return Peek(&outByte, 1);
}

unsigned int BufferedTransformation::Peek(byte *outString, unsigned int peekMax) const
{
	if (AttachedTransformation())
		return AttachedTransformation()->Peek(outString, peekMax);
	else
	{
		ArraySink arraySink(outString, peekMax);
		return CopyTo(arraySink, peekMax);
	}
}

unsigned long BufferedTransformation::Skip(unsigned long skipMax)
{
	if (AttachedTransformation())
		return AttachedTransformation()->Skip(skipMax);
	else
		return TransferTo(TheBitBucket(), skipMax);
}

unsigned long BufferedTransformation::TotalBytesRetrievable() const
{
	if (AttachedTransformation())
		return AttachedTransformation()->TotalBytesRetrievable();
	else
		return MaxRetrievable();
}

unsigned int BufferedTransformation::NumberOfMessages() const
{
	if (AttachedTransformation())
		return AttachedTransformation()->NumberOfMessages();
	else
		return CopyMessagesTo(TheBitBucket());
}

bool BufferedTransformation::AnyMessages() const
{
	if (AttachedTransformation())
		return AttachedTransformation()->AnyMessages();
	else
		return NumberOfMessages() != 0;
}

bool BufferedTransformation::GetNextMessage()
{
	if (AttachedTransformation())
		return AttachedTransformation()->GetNextMessage();
	else
	{
		assert(!AnyMessages());
		return false;
	}