Commitment.h

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// Copyright (c) 2017-2021 The PIVX Core developers
 
#ifndef PIVX_LIBZEROCOIN_COMMITMENT_H
#define PIVX_LIBZEROCOIN_COMMITMENT_H
 
#include "Params.h"
#include "serialize.h"
 
// We use a SHA256 hash for our PoK challenges. Update the following
// if we ever change hash functions.
#define COMMITMENT_EQUALITY_CHALLENGE_SIZE  256
 
// A 512-bit security parameter for the statistical ZK PoK.
#define COMMITMENT_EQUALITY_SECMARGIN       512
 
namespace libzerocoin {
 
class Commitment {
public:
    explicit Commitment(const IntegerGroupParams* p, const CBigNum& bnSerial, const CBigNum& bnRandomness):
                params(p),
                randomness(bnRandomness),
                contents(bnSerial)
    {
        this->commitmentValue = (params->g.pow_mod(this->contents, params->modulus).mul_mod(
                                 params->h.pow_mod(this->randomness, params->modulus), params->modulus));
    }
 
    Commitment(const IntegerGroupParams* p, const CBigNum& value):
        Commitment(p, value, CBigNum::randBignum(p->groupOrder)) {};
 
    const CBigNum& getCommitmentValue() const { return this->commitmentValue; };
    const CBigNum& getRandomness() const { return this->randomness; };
    const CBigNum& getContents() const { return this->contents; };
 
private:
    const IntegerGroupParams *params;
    CBigNum commitmentValue;
    CBigNum randomness;
    const CBigNum contents;
 
    SERIALIZE_METHODS(Commitment, obj) { READWRITE(obj.commitmentValue, obj.randomness, obj.contents); }
};
} /* namespace libzerocoin */
#endif // PIVX_LIBZEROCOIN_COMMITMENT_H