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/*
* Salsa20 / XSalsa20
* (C) 1999-2010 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#ifndef BOTAN_SALSA20_H__
#define BOTAN_SALSA20_H__
#include <botan/stream_cipher.h>
namespace Botan {
/**
* DJB's Salsa20 (and XSalsa20)
*/
class BOTAN_DLL Salsa20 : public StreamCipher
{
public:
void cipher(const byte in[], byte out[], size_t length);
void set_iv(const byte iv[], size_t iv_len);
bool valid_iv_length(size_t iv_len) const
{ return (iv_len == 8 || iv_len == 24); }
void clear();
std::string name() const;
StreamCipher* clone() const { return new Salsa20; }
Salsa20() : StreamCipher(16, 32, 16), state(16), buffer(64) { position = 0; }
~Salsa20() { clear(); }
private:
void key_schedule(const byte key[], u32bit key_len);
SecureVector<u32bit> state;
SecureVector<byte> buffer;
size_t position;
};
}
#endif
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