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/************************************************************************
*
* Copyright (C) 2021-2023 IRCAD France
*
* This file is part of Sight.
*
* Sight is free software: you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Sight is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Sight. If not, see <https://www.gnu.org/licenses/>.
*
***********************************************************************/
#include "base64.hpp"
#include <core/exceptionmacros.hpp>
#include <openssl/evp.h>
#include <string>
namespace sight::core::crypto
{
//------------------------------------------------------------------------------
template<typename T>
inline static T from_base64(const T& _message)
{
const std::size_t message_size = _message.size();
// Do nothing if the message is empty...
if(message_size == 0)
{
return _message;
}
// Compute the ouput size
const std::size_t predicted = 3 * message_size / 4;
// Create the output (take care of final \0);
T output;
output.resize(predicted + 1);
// Decode
const int output_size = EVP_DecodeBlock(
reinterpret_cast<unsigned char*>(output.data()),
reinterpret_cast<const unsigned char*>(_message.data()),
static_cast<int>(message_size)
);
SIGHT_THROW_EXCEPTION_IF(
core::exception("Decoding base64 message failed."),
output_size < 0
);
// Compute padding to be able to remove it
std::size_t padding = 0;
if(_message[message_size - 1] == '=')
{
padding++;
if(_message[message_size - 2] == '=')
{
padding++;
}
}
output.resize(static_cast<std::size_t>(output_size) - padding);
return output;
}
//------------------------------------------------------------------------------
secure_string from_base64(const secure_string& _message)
{
return from_base64<secure_string>(_message);
}
//------------------------------------------------------------------------------
std::string from_base64(const std::string& _message)
{
return from_base64<std::string>(_message);
}
//------------------------------------------------------------------------------
template<typename T>
T to_base64(const T& _message)
{
// Compute the output size
const std::size_t predicted = 4 * ((_message.size() + 2) / 3);
// Create the output (take care of final \0);
T output;
output.resize(predicted + 1);
// Encode
const int output_size = EVP_EncodeBlock(
reinterpret_cast<unsigned char*>(output.data()),
reinterpret_cast<const unsigned char*>(_message.data()),
static_cast<int>(_message.size())
);
output.resize(static_cast<std::size_t>(output_size));
return output;
}
//------------------------------------------------------------------------------
secure_string to_base64(const secure_string& _message)
{
return to_base64<secure_string>(_message);
}
//------------------------------------------------------------------------------
std::string to_base64(const std::string& _message)
{
return to_base64<std::string>(_message);
}
} // namespace sight::core::crypto
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