/usr/include/Poco/Crypto/CryptoTransform.h is in libpoco-dev 1.8.0.1-1ubuntu4.
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// CryptoTransform.h
//
// Library: Crypto
// Package: Cipher
// Module: CryptoTransform
//
// Definition of the CryptoTransform class.
//
// Copyright (c) 2008, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier: BSL-1.0
//
#ifndef Crypto_CryptoTransform_INCLUDED
#define Crypto_CryptoTransform_INCLUDED
#include "Poco/Crypto/Crypto.h"
#include <ios>
namespace Poco {
namespace Crypto {
class Crypto_API CryptoTransform
/// This interface represents the basic operations for cryptographic
/// transformations to be used with a CryptoInputStream or a
/// CryptoOutputStream.
///
/// Implementations of this class are returned by the Cipher class to
/// perform encryption or decryption of data.
{
public:
CryptoTransform();
/// Creates a new CryptoTransform object.
virtual ~CryptoTransform();
/// Destroys the CryptoTransform.
virtual std::size_t blockSize() const = 0;
/// Returns the block size for this CryptoTransform.
virtual int setPadding(int padding);
/// Enables or disables padding. By default encryption operations are padded using standard block
/// padding and the padding is checked and removed when decrypting. If the padding parameter is zero then
/// no padding is performed, the total amount of data encrypted or decrypted must then be a multiple of
/// the block size or an error will occur.
virtual std::streamsize transform(
const unsigned char* input,
std::streamsize inputLength,
unsigned char* output,
std::streamsize outputLength) = 0;
/// Transforms a chunk of data. The inputLength is arbitrary and does not
/// need to be a multiple of the block size. The output buffer has a maximum
/// capacity of the given outputLength that must be at least
/// inputLength + blockSize() - 1
/// Returns the number of bytes written to the output buffer.
virtual std::streamsize finalize(unsigned char* output, std::streamsize length) = 0;
/// Finalizes the transformation. The output buffer must contain enough
/// space for at least two blocks, ie.
/// length >= 2*blockSize()
/// must be true. Returns the number of bytes written to the output
/// buffer.
};
} } // namespace Poco::Crypto
#endif // Crypto_CryptoTransform_INCLUDED
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