C++ (Cpp) LastBlockSizeの例

コード例 #1

ファイル: filters.cpp プロジェクト: prakhs123/cryptopp

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);
}

コード例 #2

ファイル: filters.cpp プロジェクト: 0xmono/miranda-ng

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());
}