sign.h

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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2022 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#ifndef BITCOIN_SCRIPT_SIGN_H
#define BITCOIN_SCRIPT_SIGN_H

#include <attributes.h>
#include <coins.h>
#include <hash.h>
#include <pubkey.h>
#include <script/interpreter.h>
#include <script/keyorigin.h>
#include <script/signingprovider.h>
#include <uint256.h>

class CKey;
class CKeyID;
class CScript;
class CTransaction;
class SigningProvider;

struct bilingual_str;
struct CMutableTransaction;

class BaseSignatureCreator {
public:
    virtual ~BaseSignatureCreator() = default;
    virtual const BaseSignatureChecker& Checker() const =0;

    virtual bool CreateSig(const SigningProvider& provider, std::vector<unsigned char>& vchSig, const CKeyID& keyid, const CScript& scriptCode, SigVersion sigversion) const =0;
    virtual bool CreateSchnorrSig(const SigningProvider& provider, std::vector<unsigned char>& sig, const XOnlyPubKey& pubkey, const uint256* leaf_hash, const uint256* merkle_root, SigVersion sigversion) const =0;
};

class MutableTransactionSignatureCreator : public BaseSignatureCreator
{
    const CMutableTransaction& m_txto;
    unsigned int nIn;
    int nHashType;
    CAmount amount;
    const MutableTransactionSignatureChecker checker;
    const PrecomputedTransactionData* m_txdata;

public:
    MutableTransactionSignatureCreator(const CMutableTransaction& tx LIFETIMEBOUND, unsigned int input_idx, const CAmount& amount, int hash_type);
    MutableTransactionSignatureCreator(const CMutableTransaction& tx LIFETIMEBOUND, unsigned int input_idx, const CAmount& amount, const PrecomputedTransactionData* txdata, int hash_type);
    const BaseSignatureChecker& Checker() const override { return checker; }
    bool CreateSig(const SigningProvider& provider, std::vector<unsigned char>& vchSig, const CKeyID& keyid, const CScript& scriptCode, SigVersion sigversion) const override;
    bool CreateSchnorrSig(const SigningProvider& provider, std::vector<unsigned char>& sig, const XOnlyPubKey& pubkey, const uint256* leaf_hash, const uint256* merkle_root, SigVersion sigversion) const override;
};

extern const BaseSignatureChecker& DUMMY_CHECKER;
extern const BaseSignatureCreator& DUMMY_SIGNATURE_CREATOR;
extern const BaseSignatureCreator& DUMMY_MAXIMUM_SIGNATURE_CREATOR;

typedef std::pair<CPubKey, std::vector<unsigned char>> SigPair;

// This struct contains information from a transaction input and also contains signatures for that input.
// The information contained here can be used to create a signature and is also filled by ProduceSignature
// in order to construct final scriptSigs and scriptWitnesses.
struct SignatureData {
    bool complete = false; 
    bool witness = false; 
    CScript scriptSig; 
    CScript redeem_script; 
    CScript witness_script; 
    CScriptWitness scriptWitness; 
    TaprootSpendData tr_spenddata; 
    std::optional<TaprootBuilder> tr_builder; 
    std::map<CKeyID, SigPair> signatures; 
    std::map<CKeyID, std::pair<CPubKey, KeyOriginInfo>> misc_pubkeys;
    std::vector<unsigned char> taproot_key_path_sig; 
    std::map<std::pair<XOnlyPubKey, uint256>, std::vector<unsigned char>> taproot_script_sigs; 
    std::map<XOnlyPubKey, std::pair<std::set<uint256>, KeyOriginInfo>> taproot_misc_pubkeys; 
    std::map<CKeyID, XOnlyPubKey> tap_pubkeys; 
    std::vector<CKeyID> missing_pubkeys; 
    std::vector<CKeyID> missing_sigs; 
    uint160 missing_redeem_script; 
    uint256 missing_witness_script; 
    std::map<std::vector<uint8_t>, std::vector<uint8_t>> sha256_preimages; 
    std::map<std::vector<uint8_t>, std::vector<uint8_t>> hash256_preimages; 
    std::map<std::vector<uint8_t>, std::vector<uint8_t>> ripemd160_preimages; 
    std::map<std::vector<uint8_t>, std::vector<uint8_t>> hash160_preimages; 

    SignatureData() = default;
    explicit SignatureData(const CScript& script) : scriptSig(script) {}
    void MergeSignatureData(SignatureData sigdata);
};

bool ProduceSignature(const SigningProvider& provider, const BaseSignatureCreator& creator, const CScript& scriptPubKey, SignatureData& sigdata);

SignatureData DataFromTransaction(const CMutableTransaction& tx, unsigned int nIn, const CTxOut& txout);
void UpdateInput(CTxIn& input, const SignatureData& data);

bool IsSegWitOutput(const SigningProvider& provider, const CScript& script);

bool SignTransaction(CMutableTransaction& mtx, const SigningProvider* provider, const std::map<COutPoint, Coin>& coins, int sighash, std::map<int, bilingual_str>& input_errors);

#endif // BITCOIN_SCRIPT_SIGN_H