hush3/src/zcash/Note.hpp

#ifndef ZC_NOTE_H_
#define ZC_NOTE_H_

#include "uint256.h"
#include "Zcash.h"
#include "Address.hpp"
#include "NoteEncryption.hpp"

#include <array>

namespace libzcash {

class BaseNote {
protected:
    uint64_t value_ = 0;
public:
    BaseNote() {}
    BaseNote(uint64_t value) : value_(value) {};
    virtual ~BaseNote() {};

    virtual uint256 cm() const = 0;
    inline uint64_t value() const { return value_; };
};

class SproutNote : public BaseNote {
public:
    uint256 a_pk;
    uint256 rho;
    uint256 r;

    SproutNote(uint256 a_pk, uint64_t value, uint256 rho, uint256 r)
        : BaseNote(value), a_pk(a_pk), rho(rho), r(r) {}

    SproutNote();

    virtual ~SproutNote() {};

    virtual uint256 cm() const override;

    uint256 nullifier(const SproutSpendingKey& a_sk) const;
};


class SaplingNote : public BaseNote {
public:
    diversifier_t d;
    uint256 pk_d;
    uint256 r;

    SaplingNote(diversifier_t d, uint256 pk_d, uint64_t value, uint256 r)
            : BaseNote(value), d(d), pk_d(pk_d), r(r) {}

    SaplingNote() {};

    virtual ~SaplingNote() {};

    virtual uint256 cm() const override;

    uint256 nullifier(const SaplingSpendingKey &sk, const uint64_t position) const;

    static SaplingNote random(const SaplingSpendingKey &sk);
};

class BaseNotePlaintext {
protected:
    uint64_t value_ = 0;
    std::array<unsigned char, ZC_MEMO_SIZE> memo_;
public:
    BaseNotePlaintext() {}
    BaseNotePlaintext(const BaseNote& note, std::array<unsigned char, ZC_MEMO_SIZE> memo)
        : value_(note.value()), memo_(memo) {}
    virtual ~BaseNotePlaintext() {}

    inline uint64_t value() const { return value_; }
    inline const std::array<unsigned char, ZC_MEMO_SIZE> & memo() const { return memo_; }
};

class SproutNotePlaintext : public BaseNotePlaintext {
public:
    uint256 rho;
    uint256 r;

    SproutNotePlaintext() {}

    SproutNotePlaintext(const SproutNote& note, std::array<unsigned char, ZC_MEMO_SIZE> memo);

    SproutNote note(const SproutPaymentAddress& addr) const;

    virtual ~SproutNotePlaintext() {}

    ADD_SERIALIZE_METHODS;

    template <typename Stream, typename Operation>
    inline void SerializationOp(Stream& s, Operation ser_action) {
        unsigned char leadingByte = 0x00;
        READWRITE(leadingByte);

        if (leadingByte != 0x00) {
            throw std::ios_base::failure("lead byte of SproutNotePlaintext is not recognized");
        }

        READWRITE(value_);
        READWRITE(rho);
        READWRITE(r);
        READWRITE(memo_);
    }

    static SproutNotePlaintext decrypt(const ZCNoteDecryption& decryptor,
                                 const ZCNoteDecryption::Ciphertext& ciphertext,
                                 const uint256& ephemeralKey,
                                 const uint256& h_sig,
                                 unsigned char nonce
                                );

    ZCNoteEncryption::Ciphertext encrypt(ZCNoteEncryption& encryptor,
                                         const uint256& pk_enc
                                        ) const;
};

}

#endif // ZC_NOTE_H_