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/*
* Stream Cipher
* (C) 1999-2007 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_STREAM_CIPHER_H__
#define BOTAN_STREAM_CIPHER_H__
#include <botan/transform.h>
#include <botan/sym_algo.h>
#include <botan/scan_name.h>
namespace Botan {
/**
* Base class for all stream ciphers
*/
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[], size_t len) = 0;
/**
* Encrypt or decrypt a message
* @param buf the plaintext / ciphertext
* @param len the length of buf in bytes
*/
void cipher1(byte buf[], size_t len)
{ cipher(buf, buf, len); }
template<typename Alloc>
void encipher(std::vector<byte, Alloc>& inout)
{ cipher(&inout[0], &inout[0], inout.size()); }
template<typename Alloc>
void encrypt(std::vector<byte, Alloc>& inout)
{ cipher(&inout[0], &inout[0], inout.size()); }
template<typename Alloc>
void decrypt(std::vector<byte, Alloc>& inout)
{ cipher(&inout[0], &inout[0], inout.size()); }
/**
* 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[], size_t iv_len)
{
if(iv_len)
throw Invalid_IV_Length(name(), iv_len);
}
/**
* @param iv_len the length of the IV in bytes
* @return if the length is valid for this algorithm
*/
virtual bool valid_iv_length(size_t iv_len) const { return (iv_len == 0); }
/**
* Get a new object representing the same algorithm as *this
*/
virtual StreamCipher* clone() const = 0;
typedef SCAN_Name Spec;
};
}
#endif
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