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/*
* CTR Mode
* (C) 1999-2007 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#ifndef BOTAN_COUNTER_MODE_H__
#define BOTAN_COUNTER_MODE_H__
#include <botan/basefilt.h>
#include <botan/block_cipher.h>
namespace Botan {
/*
* CTR-BE Mode
*/
class BOTAN_DLL CTR_BE : public Keyed_Filter
{
public:
std::string name() const;
void set_iv(const InitializationVector&);
CTR_BE(BlockCipher*);
CTR_BE(BlockCipher*, const SymmetricKey&, const InitializationVector&);
~CTR_BE();
private:
static const u32bit CTR_BLOCKS_PARALLEL = 8;
void write(const byte[], u32bit);
void increment_counter();
BlockCipher* cipher;
SecureVector<byte> counter, enc_buffer;
u32bit position;
};
}
#endif
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