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/*
* SSL3-MAC
* (C) 1999-2004 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <botan/ssl3_mac.h>
namespace Botan {
/*
* Update a SSL3-MAC Calculation
*/
void SSL3_MAC::add_data(const byte input[], u32bit length)
{
hash->update(input, length);
}
/*
* Finalize a SSL3-MAC Calculation
*/
void SSL3_MAC::final_result(byte mac[])
{
hash->final(mac);
hash->update(o_key);
hash->update(mac, OUTPUT_LENGTH);
hash->final(mac);
hash->update(i_key);
}
/*
* SSL3-MAC Key Schedule
*/
void SSL3_MAC::key_schedule(const byte key[], u32bit length)
{
hash->clear();
std::fill(i_key.begin(), i_key.end(), 0x36);
std::fill(o_key.begin(), o_key.end(), 0x5C);
i_key.copy(key, length);
o_key.copy(key, length);
hash->update(i_key);
}
/*
* Clear memory of sensitive data
*/
void SSL3_MAC::clear() throw()
{
hash->clear();
i_key.clear();
o_key.clear();
}
/*
* Return the name of this type
*/
std::string SSL3_MAC::name() const
{
return "SSL3-MAC(" + hash->name() + ")";
}
/*
* Return a clone of this object
*/
MessageAuthenticationCode* SSL3_MAC::clone() const
{
return new SSL3_MAC(hash->clone());
}
/*
* SSL3-MAC Constructor
*/
SSL3_MAC::SSL3_MAC(HashFunction* hash_in) :
MessageAuthenticationCode(hash_in->OUTPUT_LENGTH,
hash_in->OUTPUT_LENGTH),
hash(hash_in)
{
if(hash->HASH_BLOCK_SIZE == 0)
throw Invalid_Argument("SSL3-MAC cannot be used with " + hash->name());
u32bit INNER_HASH_LENGTH =
(hash->name() == "SHA-160") ? 60 : hash->HASH_BLOCK_SIZE;
i_key.create(INNER_HASH_LENGTH);
o_key.create(INNER_HASH_LENGTH);
}
}
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