Esempi in C++ (Cpp) per GetMessageEncodingInterface

Esempio n. 1

File: pubkey.cpp Progetto: digitalpeer/turnstile

DecodingResult TF_VerifierBase::RecoverAndRestart(byte *recoveredMessage, PK_MessageAccumulator &messageAccumulator) const
{
	PK_MessageAccumulatorBase &ma = static_cast<PK_MessageAccumulatorBase &>(messageAccumulator);
	DecodingResult result = GetMessageEncodingInterface().RecoverMessageFromRepresentative(
		ma.AccessHash(), GetHashIdentifier(), ma.m_empty, ma.m_representative, MessageRepresentativeBitLength(), recoveredMessage);
	ma.m_empty = true;
	return result;
}

Esempio n. 2

File: pubkey.cpp Progetto: digitalpeer/turnstile

bool TF_VerifierBase::VerifyAndRestart(PK_MessageAccumulator &messageAccumulator) const
{
	PK_MessageAccumulatorBase &ma = static_cast<PK_MessageAccumulatorBase &>(messageAccumulator);
	bool result = GetMessageEncodingInterface().VerifyMessageRepresentative(
		ma.AccessHash(), GetHashIdentifier(), ma.m_empty, ma.m_representative, MessageRepresentativeBitLength());
	ma.m_empty = true;
	return result;
}

Esempio n. 3

File: pubkey.cpp Progetto: brolee/EMule-GIFC

DecodingResult TF_DecryptorBase::Decrypt(RandomNumberGenerator &rng, const byte *ciphertext, size_t ciphertextLength, byte *plaintext, const NameValuePairs &parameters) const
{
	SecByteBlock paddedBlock(PaddedBlockByteLength());
	Integer x = GetTrapdoorFunctionInterface().CalculateInverse(rng, Integer(ciphertext, FixedCiphertextLength()));
	if (x.ByteCount() > paddedBlock.size())
		x = Integer::Zero();	// don't return false here to prevent timing attack
	x.Encode(paddedBlock, paddedBlock.size());
	return GetMessageEncodingInterface().Unpad(paddedBlock, PaddedBlockBitLength(), plaintext, parameters);
}

Esempio n. 4

void TF_EncryptorBase::Encrypt(RandomNumberGenerator &rng, const byte *plaintext, unsigned int plaintextLength, byte *ciphertext, const NameValuePairs &parameters) const
{
	if (plaintextLength > FixedMaxPlaintextLength())
		throw InvalidArgument(AlgorithmName() + ": message too long for this public key");

	SecByteBlock paddedBlock(PaddedBlockByteLength());
	GetMessageEncodingInterface().Pad(rng, plaintext, plaintextLength, paddedBlock, PaddedBlockBitLength(), parameters);
	GetTrapdoorFunctionInterface().ApplyRandomizedFunction(rng, Integer(paddedBlock, paddedBlock.size())).Encode(ciphertext, FixedCiphertextLength());
}

Esempio n. 5

File: pubkey.cpp Progetto: BreakoutCoin/Breakout-Chain-Client

DecodingResult TF_DecryptorBase::Decrypt(RandomNumberGenerator &rng, const byte *ciphertext, size_t ciphertextLength, byte *plaintext, const NameValuePairs &parameters) const
{
	if (ciphertextLength != FixedCiphertextLength())
			throw InvalidArgument(AlgorithmName() + ": ciphertext length of " + IntToString(ciphertextLength) + " doesn't match the required length of " + IntToString(FixedCiphertextLength()) + " for this key");

	SecByteBlock paddedBlock(PaddedBlockByteLength());
	Integer x = GetTrapdoorFunctionInterface().CalculateInverse(rng, Integer(ciphertext, ciphertextLength));
	if (x.ByteCount() > paddedBlock.size())
		x = Integer::Zero();	// don't return false here to prevent timing attack
	x.Encode(paddedBlock, paddedBlock.size());
	return GetMessageEncodingInterface().Unpad(paddedBlock, PaddedBlockBitLength(), plaintext, parameters);
}

Esempio n. 6

File: pubkey.cpp Progetto: brolee/EMule-GIFC

void TF_EncryptorBase::Encrypt(RandomNumberGenerator &rng, const byte *plaintext, size_t plaintextLength, byte *ciphertext, const NameValuePairs &parameters) const
{
	if (plaintextLength > FixedMaxPlaintextLength())
	{
		if (FixedMaxPlaintextLength() < 1)
			throw InvalidArgument(AlgorithmName() + ": this key is too short to encrypt any messages");
		else
			throw InvalidArgument(AlgorithmName() + ": message length of " + IntToString(plaintextLength) + " exceeds the maximum of " + IntToString(FixedMaxPlaintextLength()) + " for this public key");
	}

	SecByteBlock paddedBlock(PaddedBlockByteLength());
	GetMessageEncodingInterface().Pad(rng, plaintext, plaintextLength, paddedBlock, PaddedBlockBitLength(), parameters);
	GetTrapdoorFunctionInterface().ApplyRandomizedFunction(rng, Integer(paddedBlock, paddedBlock.size())).Encode(ciphertext, FixedCiphertextLength());
}

Esempio n. 7

File: pubkey.cpp Progetto: brolee/EMule-GIFC

DecodingResult TF_VerifierBase::RecoverAndRestart(byte *recoveredMessage, PK_MessageAccumulator &messageAccumulator) const
{
	PK_MessageAccumulatorBase &ma = static_cast<PK_MessageAccumulatorBase &>(messageAccumulator);
	HashIdentifier id = GetHashIdentifier();
	const MessageEncodingInterface &encoding = GetMessageEncodingInterface();

	if (MessageRepresentativeBitLength() < encoding.MinRepresentativeBitLength(id.second, ma.AccessHash().DigestSize()))
		throw PK_SignatureScheme::KeyTooShort();

	DecodingResult result = encoding.RecoverMessageFromRepresentative(
		ma.AccessHash(), id, ma.m_empty, ma.m_representative, MessageRepresentativeBitLength(), recoveredMessage);
	ma.m_empty = true;
	return result;
}

Esempio n. 8

File: pubkey.cpp Progetto: brolee/EMule-GIFC

void TF_VerifierBase::InputSignature(PK_MessageAccumulator &messageAccumulator, const byte *signature, size_t signatureLength) const
{
	PK_MessageAccumulatorBase &ma = static_cast<PK_MessageAccumulatorBase &>(messageAccumulator);
	HashIdentifier id = GetHashIdentifier();
	const MessageEncodingInterface &encoding = GetMessageEncodingInterface();

	if (MessageRepresentativeBitLength() < encoding.MinRepresentativeBitLength(id.second, ma.AccessHash().DigestSize()))
		throw PK_SignatureScheme::KeyTooShort();

	ma.m_representative.New(MessageRepresentativeLength());
	Integer x = GetTrapdoorFunctionInterface().ApplyFunction(Integer(signature, signatureLength));
	if (x.BitCount() > MessageRepresentativeBitLength())
		x = Integer::Zero();	// don't return false here to prevent timing attack
	x.Encode(ma.m_representative, ma.m_representative.size());
}

Esempio n. 9

File: pubkey.cpp Progetto: digitalpeer/turnstile

unsigned int TF_SignerBase::SignAndRestart(RandomNumberGenerator &rng, PK_MessageAccumulator &messageAccumulator, byte *signature, bool restart) const
{
	PK_MessageAccumulatorBase &ma = static_cast<PK_MessageAccumulatorBase &>(messageAccumulator);
	SecByteBlock representative(MessageRepresentativeLength());
	GetMessageEncodingInterface().ComputeMessageRepresentative(rng, 
		ma.m_recoverableMessage, ma.m_recoverableMessage.size(), 
		ma.AccessHash(), GetHashIdentifier(), ma.m_empty,
		representative, MessageRepresentativeBitLength());
	ma.m_empty = true;

	Integer r(representative, representative.size());
	unsigned int signatureLength = SignatureLength();
	GetTrapdoorFunctionInterface().CalculateRandomizedInverse(rng, r).Encode(signature, signatureLength);
	return signatureLength;
}

Esempio n. 10

File: pubkey.cpp Progetto: digitalpeer/turnstile

void TF_SignerBase::InputRecoverableMessage(PK_MessageAccumulator &messageAccumulator, const byte *recoverableMessage, unsigned int recoverableMessageLength) const
{
	PK_MessageAccumulatorBase &ma = static_cast<PK_MessageAccumulatorBase &>(messageAccumulator);
	const MessageEncodingInterface &mei = GetMessageEncodingInterface();
	unsigned int maxRecoverableLength = mei.MaxRecoverableLength(MessageRepresentativeBitLength(), GetHashIdentifier().second, ma.AccessHash().DigestSize());

	if (maxRecoverableLength == 0)
		{throw NotImplemented("TF_SignerBase: this algorithm does not support messsage recovery or the key is too short");}
	if (recoverableMessageLength > maxRecoverableLength)
		throw InvalidArgument("TF_SignerBase: the recoverable message part is too long for the given key and algorithm");

	ma.m_recoverableMessage.Assign(recoverableMessage, recoverableMessageLength);
	mei.ProcessRecoverableMessage(
		ma.AccessHash(), 
		recoverableMessage, recoverableMessageLength,
		NULL, 0, ma.m_semisignature);
}

Esempio n. 11

File: pubkey.cpp Progetto: brolee/EMule-GIFC

size_t TF_SignerBase::SignAndRestart(RandomNumberGenerator &rng, PK_MessageAccumulator &messageAccumulator, byte *signature, bool restart) const
{
	PK_MessageAccumulatorBase &ma = static_cast<PK_MessageAccumulatorBase &>(messageAccumulator);
	HashIdentifier id = GetHashIdentifier();
	const MessageEncodingInterface &encoding = GetMessageEncodingInterface();

	if (MessageRepresentativeBitLength() < encoding.MinRepresentativeBitLength(id.second, ma.AccessHash().DigestSize()))
		throw PK_SignatureScheme::KeyTooShort();

	SecByteBlock representative(MessageRepresentativeLength());
	encoding.ComputeMessageRepresentative(rng, 
		ma.m_recoverableMessage, ma.m_recoverableMessage.size(), 
		ma.AccessHash(), id, ma.m_empty,
		representative, MessageRepresentativeBitLength());
	ma.m_empty = true;

	Integer r(representative, representative.size());
	size_t signatureLength = SignatureLength();
	GetTrapdoorFunctionInterface().CalculateRandomizedInverse(rng, r).Encode(signature, signatureLength);
	return signatureLength;
}