C++ (Cpp) FixedCiphertextLengthの例

コード例 #1

ファイル: cryptlib.cpp プロジェクト: randombit/hacrypto

DecodingResult PK_FixedLengthDecryptor::Decrypt(const byte *cipherText, unsigned int cipherTextLength, byte *plainText) const
{
	if (cipherTextLength != FixedCiphertextLength())
		return DecodingResult();

	return FixedLengthDecrypt(cipherText, plainText);
}

コード例 #2

ファイル: cryptlib.cpp プロジェクト: randombit/hacrypto

unsigned int PK_FixedLengthCryptoSystem::CiphertextLength(unsigned int plainTextLength) const
{
	if (plainTextLength <= FixedMaxPlaintextLength())
		return FixedCiphertextLength();
	else
		return 0;
}

コード例 #3

ファイル: cryptlib.cpp プロジェクト: randombit/hacrypto

unsigned int PK_FixedLengthCryptoSystem::MaxPlaintextLength(unsigned int cipherTextLength) const
{
	if (cipherTextLength == FixedCiphertextLength())
		return FixedMaxPlaintextLength();
	else
		return 0;
}

コード例 #4

ファイル: pubkey.cpp プロジェクト: 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);
}

コード例 #5

ファイル: pubkey.cpp プロジェクト: 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());
}

コード例 #6

ファイル: pubkey.cpp プロジェクト: 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);
}

コード例 #7

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());
}