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/*************************************************
* Filters Header File *
* (C) 1999-2006 The Botan Project *
*************************************************/
#ifndef BOTAN_FILTERS_H__
#define BOTAN_FILTERS_H__
#include <botan/pipe.h>
#include <botan/basefilt.h>
#include <botan/data_snk.h>
#include <botan/pk_filts.h>
#include <botan/base64.h>
#include <botan/hex.h>
namespace Botan {
/*************************************************
* Stream Cipher Filter *
*************************************************/
class StreamCipher_Filter : public Keyed_Filter
{
public:
void seek(u32bit position) { cipher->seek(position); }
bool supports_resync() const { return (cipher->IV_LENGTH != 0); }
void set_iv(const InitializationVector&);
void write(const byte[], u32bit);
StreamCipher_Filter(const std::string&);
StreamCipher_Filter(const std::string&, const SymmetricKey&);
~StreamCipher_Filter() { delete cipher; }
private:
SecureVector<byte> buffer;
StreamCipher* cipher;
};
/*************************************************
* Hash Filter *
*************************************************/
class Hash_Filter : public Filter
{
public:
void write(const byte input[], u32bit len) { hash->update(input, len); }
void end_msg();
Hash_Filter(const std::string&, u32bit = 0);
~Hash_Filter() { delete hash; }
private:
const u32bit OUTPUT_LENGTH;
HashFunction* hash;
};
/*************************************************
* MessageAuthenticationCode Filter *
*************************************************/
class MAC_Filter : public Keyed_Filter
{
public:
void write(const byte input[], u32bit len) { mac->update(input, len); }
void end_msg();
MAC_Filter(const std::string&, u32bit = 0);
MAC_Filter(const std::string&, const SymmetricKey&, u32bit = 0);
~MAC_Filter() { delete mac; }
private:
const u32bit OUTPUT_LENGTH;
MessageAuthenticationCode* mac;
};
}
#endif
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