Exemple #1
0
size_t 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;
}
Exemple #2
0
StreamTransformationFilter::StreamTransformationFilter(StreamTransformation &c, BufferedTransformation *attachment, BlockPaddingScheme padding, bool allowAuthenticatedSymmetricCipher)
	: FilterWithBufferedInput(attachment)
	, m_cipher(c), m_padding(DEFAULT_PADDING), m_optimalBufferSize(0)
{
	assert(c.MinLastBlockSize() == 0 || c.MinLastBlockSize() > c.MandatoryBlockSize());

	if (!allowAuthenticatedSymmetricCipher && dynamic_cast<AuthenticatedSymmetricCipher *>(&c) != 0)
		throw InvalidArgument("StreamTransformationFilter: please use AuthenticatedEncryptionFilter and AuthenticatedDecryptionFilter for AuthenticatedSymmetricCipher");

	IsolatedInitialize(MakeParameters(Name::BlockPaddingScheme(), padding));
}
Exemple #3
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());
}