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/*
* EMSA-Raw
* (C) 1999-2007 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/emsa_raw.h>
#include <botan/exceptn.h>
namespace Botan {
std::string EMSA_Raw::name() const
{
if(m_expected_size > 0)
return "Raw(" + std::to_string(m_expected_size) + ")";
return "Raw";
}
/*
* EMSA-Raw Encode Operation
*/
void EMSA_Raw::update(const uint8_t input[], size_t length)
{
m_message += std::make_pair(input, length);
}
/*
* Return the raw (unencoded) data
*/
secure_vector<uint8_t> EMSA_Raw::raw_data()
{
if(m_expected_size && m_message.size() != m_expected_size)
throw Invalid_Argument("EMSA_Raw was configured to use a " +
std::to_string(m_expected_size) +
" byte hash but instead was used for a " +
std::to_string(m_message.size()) + " hash");
secure_vector<uint8_t> output;
std::swap(m_message, output);
return output;
}
/*
* EMSA-Raw Encode Operation
*/
secure_vector<uint8_t>
EMSA_Raw::encoding_of(const secure_vector<uint8_t>& msg,
size_t,
RandomNumberGenerator&)
{
if(m_expected_size && msg.size() != m_expected_size)
throw Invalid_Argument("EMSA_Raw was configured to use a " +
std::to_string(m_expected_size) +
" byte hash but instead was used for a " +
std::to_string(msg.size()) + " hash");
return msg;
}
/*
* EMSA-Raw Verify Operation
*/
bool EMSA_Raw::verify(const secure_vector<uint8_t>& coded,
const secure_vector<uint8_t>& raw,
size_t)
{
if(m_expected_size && raw.size() != m_expected_size)
return false;
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(!constant_time_compare(coded.data(), raw.data() + leading_zeros_expected, coded.size()))
same_modulo_leading_zeros = false;
return same_modulo_leading_zeros;
}
}