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/*************************************************
* ANSI X9.19 MAC Source File *
* (C) 1999-2008 The Botan Project *
*************************************************/
#include <botan/x919_mac.h>
#include <botan/lookup.h>
#include <botan/bit_ops.h>
#include <algorithm>
namespace Botan {
/*************************************************
* Update an ANSI X9.19 MAC Calculation *
*************************************************/
void ANSI_X919_MAC::add_data(const byte input[], u32bit length)
{
u32bit xored = std::min(8 - position, length);
xor_buf(state + position, input, xored);
position += xored;
if(position < 8) return;
e->encrypt(state);
input += xored;
length -= xored;
while(length >= 8)
{
xor_buf(state, input, 8);
e->encrypt(state);
input += 8;
length -= 8;
}
xor_buf(state, input, length);
position = length;
}
/*************************************************
* Finalize an ANSI X9.19 MAC Calculation *
*************************************************/
void ANSI_X919_MAC::final_result(byte mac[])
{
if(position)
e->encrypt(state);
d->decrypt(state, mac);
e->encrypt(mac);
state.clear();
position = 0;
}
/*************************************************
* ANSI X9.19 MAC Key Schedule *
*************************************************/
void ANSI_X919_MAC::key(const byte key[], u32bit length)
{
e->set_key(key, 8);
if(length == 8) d->set_key(key, 8);
else d->set_key(key + 8, 8);
}
/*************************************************
* Clear memory of sensitive data *
*************************************************/
void ANSI_X919_MAC::clear() throw()
{
e->clear();
d->clear();
state.clear();
position = 0;
}
/*************************************************
* ANSI X9.19 MAC Constructor *
*************************************************/
ANSI_X919_MAC::ANSI_X919_MAC() : MessageAuthenticationCode(8, 8, 16, 8)
{
e = get_block_cipher("DES");
d = get_block_cipher("DES");
position = 0;
}
/*************************************************
* ANSI X9.19 MAC Destructor *
*************************************************/
ANSI_X919_MAC::~ANSI_X919_MAC()
{
delete e;
delete d;
}
}
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