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/* +------------------------------------+
* | Inspire Internet Relay Chat Daemon |
* +------------------------------------+
*
* InspIRCd: (C) 2002-2010 InspIRCd Development Team
* See: http://wiki.inspircd.org/Credits
*
* This program is free but copyrighted software; see
* the file COPYING for details.
*
* ---------------------------------------------------
*/
#ifndef HASH_H
#define HASH_H
#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, int osiz, int bsiz)
: DataProvider(mod, Name), out_size(osiz), block_size(bsiz) {}
virtual std::string sum(const std::string& data) = 0;
inline std::string hexsum(const std::string& data)
{
return BinToHex(sum(data));
}
inline std::string b64sum(const std::string& data)
{
return BinToBase64(sum(data), NULL, 0);
}
/** Allows the IVs for the hash to be specified. As the choice of initial IV is
* important for the security of a hash, this should not be used except to
* maintain backwards compatability. This also allows you to change the hex
* sequence from its default of "0123456789abcdef", which does not improve the
* strength of the output, but helps confuse those attempting to implement it.
*
* Example:
* \code
* unsigned int iv[] = { 0xFFFFFFFF, 0x00000000, 0xAAAAAAAA, 0xCCCCCCCC };
* std::string result = Hash.sumIV(iv, "fedcba9876543210", "data");
* \endcode
*/
virtual std::string sumIV(unsigned int* IV, const char* HexMap, const std::string &sdata) = 0;
/** 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 ? sum(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(sum(hmac2));
return sum(hmac1);
}
};
#endif
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