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/*
* EMSA-Raw
* (C) 1999-2007 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/internal/pad_utils.h>
#include <botan/emsa_raw.h>
namespace Botan {
BOTAN_REGISTER_EMSA_NAMED_NOARGS(EMSA_Raw, "Raw");
/*
* EMSA-Raw Encode Operation
*/
void EMSA_Raw::update(const byte input[], size_t length)
{
message += std::make_pair(input, length);
}
/*
* Return the raw (unencoded) data
*/
secure_vector<byte> EMSA_Raw::raw_data()
{
secure_vector<byte> output;
std::swap(message, output);
return output;
}
/*
* EMSA-Raw Encode Operation
*/
secure_vector<byte> EMSA_Raw::encoding_of(const secure_vector<byte>& msg,
size_t,
RandomNumberGenerator&)
{
return msg;
}
/*
* EMSA-Raw Verify Operation
*/
bool EMSA_Raw::verify(const secure_vector<byte>& coded,
const secure_vector<byte>& raw,
size_t)
{
if(coded.size() == raw.size())
return (coded == raw);
if(coded.size() > raw.size())
return false;
// handle zero padding differences
const size_t leading_zeros_expected = raw.size() - coded.size();
bool same_modulo_leading_zeros = true;
for(size_t i = 0; i != leading_zeros_expected; ++i)
if(raw[i])
same_modulo_leading_zeros = false;
if(!same_mem(&coded[0], &raw[leading_zeros_expected], coded.size()))
same_modulo_leading_zeros = false;
return same_modulo_leading_zeros;
}
}
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