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/*
* Filters
* (C) 1999-2007 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#ifndef BOTAN_FILTERS_H__
#define BOTAN_FILTERS_H__
#include <botan/block_cipher.h>
#include <botan/stream_cipher.h>
#include <botan/hash.h>
#include <botan/mac.h>
#include <botan/pipe.h>
#include <botan/basefilt.h>
#include <botan/data_snk.h>
#include <botan/scan_name.h>
#if defined(BOTAN_HAS_BASE64_CODEC)
#include <botan/base64.h>
#endif
#if defined(BOTAN_HAS_HEX_CODEC)
#include <botan/hex.h>
#endif
namespace Botan {
/**
* Stream Cipher Filter.
*/
class BOTAN_DLL StreamCipher_Filter : public Keyed_Filter
{
public:
/**
* Seek in the stream.
* @param position the position to seek ahead
*/
void seek(u32bit position) { cipher->seek(position); }
/**
* Find out whether the cipher underlying this filter supports
* resyncing.
* @return true if the cipher supports resyncing
*/
bool supports_resync() const { return (cipher->IV_LENGTH != 0); }
/**
* Set the initialization vector for this filter.
* @param iv the initialization vector to set
*/
void set_iv(const InitializationVector& iv);
void write(const byte[], u32bit);
/**
* Construct a stream cipher filter.
* @param cipher_obj a cipher object to use
*/
StreamCipher_Filter(StreamCipher* cipher_obj);
/**
* Construct a stream cipher filter.
* @param cipher the name of the desired cipher
*/
StreamCipher_Filter(const std::string& cipher);
/**
* Construct a stream cipher filter.
* @param cipher the name of the desired cipher
* @param key the key to use inside this filter
*/
StreamCipher_Filter(const std::string& cipher, const SymmetricKey& key);
~StreamCipher_Filter() { delete cipher; }
private:
SecureVector<byte> buffer;
StreamCipher* cipher;
};
/**
* Hash Filter.
*/
class BOTAN_DLL Hash_Filter : public Filter
{
public:
void write(const byte input[], u32bit len) { hash->update(input, len); }
void end_msg();
/**
* Construct a hash filter.
* @param hash_fun the hash function to use
* @param len the output length of this filter. Leave the default
* value 0 if you want to use the full output of the hashfunction
* hash. Otherwise, specify a smaller value here so that the
* output of the hash algorithm will be cut off.
*/
Hash_Filter(HashFunction* hash_fun, u32bit len = 0) :
OUTPUT_LENGTH(len), hash(hash_fun) {}
/**
* Construct a hash filter.
* @param request the name of the hash algorithm to use
* @param len the output length of this filter. Leave the default
* value 0 if you want to use the full output of the hashfunction
* hash. Otherwise, specify a smaller value here so that the
* output of the hash algorithm will be cut off.
*/
Hash_Filter(const std::string& request, u32bit len = 0);
~Hash_Filter() { delete hash; }
private:
const u32bit OUTPUT_LENGTH;
HashFunction* hash;
};
/**
* MessageAuthenticationCode Filter.
*/
class BOTAN_DLL MAC_Filter : public Keyed_Filter
{
public:
void write(const byte input[], u32bit len) { mac->update(input, len); }
void end_msg();
/**
* Construct a MAC filter. The MAC key will be left empty.
* @param mac the MAC to use
* @param len the output length of this filter. Leave the default
* value 0 if you want to use the full output of the
* MAC. Otherwise, specify a smaller value here so that the
* output of the MAC will be cut off.
*/
MAC_Filter(MessageAuthenticationCode* mac_obj,
u32bit out_len = 0) : OUTPUT_LENGTH(out_len)
{
base_ptr = mac = mac_obj;
}
/**
* Construct a MAC filter.
* @param mac the MAC to use
* @param key the MAC key to use
* @param len the output length of this filter. Leave the default
* value 0 if you want to use the full output of the
* MAC. Otherwise, specify a smaller value here so that the
* output of the MAC will be cut off.
*/
MAC_Filter(MessageAuthenticationCode* mac_obj,
const SymmetricKey& key,
u32bit out_len = 0) : OUTPUT_LENGTH(out_len)
{
base_ptr = mac = mac_obj;
mac->set_key(key);
}
/**
* Construct a MAC filter. The MAC key will be left empty.
* @param mac the name of the MAC to use
* @param len the output length of this filter. Leave the default
* value 0 if you want to use the full output of the
* MAC. Otherwise, specify a smaller value here so that the
* output of the MAC will be cut off.
*/
MAC_Filter(const std::string& mac, u32bit len = 0);
/**
* Construct a MAC filter.
* @param mac the name of the MAC to use
* @param key the MAC key to use
* @param len the output length of this filter. Leave the default
* value 0 if you want to use the full output of the
* MAC. Otherwise, specify a smaller value here so that the
* output of the MAC will be cut off.
*/
MAC_Filter(const std::string& mac, const SymmetricKey& key,
u32bit len = 0);
~MAC_Filter() { delete mac; }
private:
const u32bit OUTPUT_LENGTH;
MessageAuthenticationCode* mac;
};
}
#endif
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