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/*
* RC4
* (C) 1999-2008 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_RC4_H__
#define BOTAN_RC4_H__
#include <botan/stream_cipher.h>
#include <botan/types.h>
namespace Botan {
/**
* RC4 stream cipher
*/
class BOTAN_DLL RC4 final : public StreamCipher
{
public:
void cipher(const byte in[], byte out[], size_t length) override;
void clear() override;
std::string name() const override;
StreamCipher* clone() const override { return new RC4(m_SKIP); }
Key_Length_Specification key_spec() const override
{
return Key_Length_Specification(1, 256);
}
static RC4* make(const Spec& spec);
/**
* @param skip skip this many initial bytes in the keystream
*/
explicit RC4(size_t skip = 0);
~RC4() { clear(); }
void seek(u64bit offset) override;
private:
void key_schedule(const byte[], size_t) override;
void generate();
const size_t m_SKIP;
byte m_X = 0;
byte m_Y = 0;
secure_vector<byte> m_state;
secure_vector<byte> m_buffer;
size_t m_position = 0;
};
}
#endif
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