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/**
* Stream Cipher
* (C) 1999-2007 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#ifndef BOTAN_STREAM_CIPHER_H__
#define BOTAN_STREAM_CIPHER_H__
#include <botan/sym_algo.h>
namespace Botan {
/*
* Stream Cipher
*/
class BOTAN_DLL StreamCipher : public SymmetricAlgorithm
{
public:
/**
* Encrypt or decrypt a message
* @param in the plaintext
* @param out the byte array to hold the output, i.e. the ciphertext
* @param len the length of both in and out in bytes
*/
virtual void cipher(const byte in[], byte out[], u32bit len) = 0;
/**
* Encrypt or decrypt a message
* @param buf the plaintext / ciphertext
* @param len the length of buf in bytes
*/
void cipher1(byte buf[], u32bit len)
{ cipher(buf, buf, len); }
/**
* Resync the cipher using the IV
* @param iv the initialization vector
* @param iv_len the length of the IV in bytes
*/
virtual void set_iv(const byte[], u32bit iv_len)
{
if(iv_len)
throw Exception("The stream cipher " + name() +
" does not support resyncronization");
}
/**
* @param iv_len the length of the IV in bytes
* @return if the length is valid for this algorithm
*/
virtual bool valid_iv_length(u32bit iv_len) const
{ return (iv_len == 0); }
/**
* Get a new object representing the same algorithm as *this
*/
virtual StreamCipher* clone() const = 0;
/**
* Zeroize internal state
*/
virtual void clear() = 0;
/**
* StreamCipher constructor
*/
StreamCipher(u32bit key_min,
u32bit key_max = 0,
u32bit key_mod = 1) :
SymmetricAlgorithm(key_min, key_max, key_mod) {}
virtual ~StreamCipher() {}
};
}
#endif
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