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/*
* Filters
* (C) 1999-2007 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <botan/filters.h>
#include <botan/libstate.h>
#include <algorithm>
namespace Botan {
/*
* StreamCipher_Filter Constructor
*/
StreamCipher_Filter::StreamCipher_Filter(const std::string& sc_name) :
buffer(DEFAULT_BUFFERSIZE)
{
Algorithm_Factory& af = global_state().algorithm_factory();
base_ptr = cipher = af.make_stream_cipher(sc_name);
}
/*
* StreamCipher_Filter Constructor
*/
StreamCipher_Filter::StreamCipher_Filter(StreamCipher* stream_cipher) :
buffer(DEFAULT_BUFFERSIZE)
{
base_ptr = cipher = stream_cipher;
}
/*
* StreamCipher_Filter Constructor
*/
StreamCipher_Filter::StreamCipher_Filter(const std::string& sc_name,
const SymmetricKey& key) :
buffer(DEFAULT_BUFFERSIZE)
{
Algorithm_Factory& af = global_state().algorithm_factory();
base_ptr = cipher = af.make_stream_cipher(sc_name);
cipher->set_key(key);
}
/*
* Set the IV of a stream cipher
*/
void StreamCipher_Filter::set_iv(const InitializationVector& iv)
{
cipher->resync(iv.begin(), iv.length());
}
/*
* Write data into a StreamCipher_Filter
*/
void StreamCipher_Filter::write(const byte input[], u32bit length)
{
while(length)
{
u32bit copied = std::min(length, buffer.size());
cipher->encrypt(input, buffer, copied);
send(buffer, copied);
input += copied;
length -= copied;
}
}
/*
* Hash_Filter Constructor
*/
Hash_Filter::Hash_Filter(const std::string& algo_spec,
u32bit len) :
OUTPUT_LENGTH(len)
{
Algorithm_Factory& af = global_state().algorithm_factory();
hash = af.make_hash_function(algo_spec);
}
/*
* Complete a calculation by a Hash_Filter
*/
void Hash_Filter::end_msg()
{
SecureVector<byte> output = hash->final();
if(OUTPUT_LENGTH)
send(output, std::min(OUTPUT_LENGTH, output.size()));
else
send(output);
}
/*
* MAC_Filter Constructor
*/
MAC_Filter::MAC_Filter(const std::string& mac_name, u32bit len) :
OUTPUT_LENGTH(len)
{
Algorithm_Factory& af = global_state().algorithm_factory();
base_ptr = mac = af.make_mac(mac_name);
}
/*
* MAC_Filter Constructor
*/
MAC_Filter::MAC_Filter(const std::string& mac_name, const SymmetricKey& key,
u32bit len) : OUTPUT_LENGTH(len)
{
Algorithm_Factory& af = global_state().algorithm_factory();
base_ptr = mac = af.make_mac(mac_name);
mac->set_key(key);
}
/*
* Complete a calculation by a MAC_Filter
*/
void MAC_Filter::end_msg()
{
SecureVector<byte> output = mac->final();
if(OUTPUT_LENGTH)
send(output, std::min(OUTPUT_LENGTH, output.size()));
else
send(output);
}
}
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