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/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2010 Daniel De Graaf <danieldg@inspircd.org>
*
* This file is part of InspIRCd. InspIRCd is free software: you can
* redistribute it and/or modify it under the terms of the GNU General Public
* License as published by the Free Software Foundation, version 2.
*
* This program 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 General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include "modules.h"
class HashProvider : public DataProvider
{
public:
const unsigned int out_size;
const unsigned int block_size;
HashProvider(Module* mod, const std::string& Name, unsigned int osiz = 0, unsigned int bsiz = 0)
: DataProvider(mod, "hash/" + Name), out_size(osiz), block_size(bsiz)
{
}
virtual std::string GenerateRaw(const std::string& data) = 0;
virtual std::string ToPrintable(const std::string& raw)
{
return BinToHex(raw);
}
virtual bool Compare(const std::string& input, const std::string& hash)
{
return InspIRCd::TimingSafeCompare(Generate(input), hash);
}
std::string Generate(const std::string& data)
{
return ToPrintable(GenerateRaw(data));
}
/** HMAC algorithm, RFC 2104 */
std::string hmac(const std::string& key, const std::string& msg)
{
std::string hmac1, hmac2;
std::string kbuf = key.length() > block_size ? GenerateRaw(key) : key;
kbuf.resize(block_size);
for (size_t n = 0; n < block_size; n++)
{
hmac1.push_back(static_cast<char>(kbuf[n] ^ 0x5C));
hmac2.push_back(static_cast<char>(kbuf[n] ^ 0x36));
}
hmac2.append(msg);
hmac1.append(GenerateRaw(hmac2));
return GenerateRaw(hmac1);
}
bool IsKDF() const
{
return (!block_size);
}
};
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