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prf.h
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prf.h
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/*
* Copyright (c) 2015 Tim Ruffing <tim.ruffing@mmci.uni-saarland.de>
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
*/
#ifndef PRF_H
#define PRF_H
#include "chameleonhash.h"
#include <assert.h>
#include "secp256k1/src/hash.h"
#include "secp256k1/src/hash_impl.h"
class Node;
class Prf
{
public:
static const size_t KEY_LEN = 32;
static const size_t HASH_LEN = 32;
typedef std::array<unsigned char, KEY_LEN> key_t;
typedef std::array<unsigned char, HASH_LEN> out_t;
typedef std::vector<unsigned char> data_t;
Prf(key_t key);
Prf(ChameleonHash::sk_t dsk, bool extract);
void getX(out_t& x, Node& i);
void getR(out_t& r, Node& i);
private:
secp256k1_hmac_sha256_t hash;
key_t key;
static const unsigned char X;
static const unsigned char R;
void get_random_with_prefix(out_t& x, const data_t& data, const unsigned char& R);
};
#endif // PRF_H