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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2021 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/standard.h>
class CKey;
class CKeyID;
class CScript;
class CTransaction;
class SigningProvider;
struct bilingual_str;
struct CMutableTransaction;
/** Interface for signature creators. */
class BaseSignatureCreator {
public:
virtual ~BaseSignatureCreator() {}
virtual const BaseSignatureChecker& Checker() const =0;
/** Create a singular (non-script) signature. */
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;
};
/** A signature creator for transactions. */
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;
};
/** A signature creator that just produces 71-byte empty signatures. */
extern const BaseSignatureCreator& DUMMY_SIGNATURE_CREATOR;
/** A signature creator that just produces 72-byte empty signatures. */
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; ///< Stores whether the scriptSig and scriptWitness are complete
bool witness = false; ///< Stores whether the input this SigData corresponds to is a witness input
CScript scriptSig; ///< The scriptSig of an input. Contains complete signatures or the traditional partial signatures format
CScript redeem_script; ///< The redeemScript (if any) for the input
CScript witness_script; ///< The witnessScript (if any) for the input. witnessScripts are used in P2WSH outputs.
CScriptWitness scriptWitness; ///< The scriptWitness of an input. Contains complete signatures or the traditional partial signatures format. scriptWitness is part of a transaction input per BIP 144.
TaprootSpendData tr_spenddata; ///< Taproot spending data.
std::map<CKeyID, SigPair> signatures; ///< BIP 174 style partial signatures for the input. May contain all signatures necessary for producing a final scriptSig or scriptWitness.
std::map<CKeyID, std::pair<CPubKey, KeyOriginInfo>> misc_pubkeys;
std::vector<unsigned char> taproot_key_path_sig; /// Schnorr signature for key path spending
std::map<std::pair<XOnlyPubKey, uint256>, std::vector<unsigned char>> taproot_script_sigs; ///< (Partial) schnorr signatures, indexed by XOnlyPubKey and leaf_hash.
std::vector<CKeyID> missing_pubkeys; ///< KeyIDs of pubkeys which could not be found
std::vector<CKeyID> missing_sigs; ///< KeyIDs of pubkeys for signatures which could not be found
uint160 missing_redeem_script; ///< ScriptID of the missing redeemScript (if any)
uint256 missing_witness_script; ///< SHA256 of the missing witnessScript (if any)
SignatureData() {}
explicit SignatureData(const CScript& script) : scriptSig(script) {}
void MergeSignatureData(SignatureData sigdata);
};
/** Produce a script signature using a generic signature creator. */
bool ProduceSignature(const SigningProvider& provider, const BaseSignatureCreator& creator, const CScript& scriptPubKey, SignatureData& sigdata);
/** Produce a script signature for a transaction. */
bool SignSignature(const SigningProvider &provider, const CScript& fromPubKey, CMutableTransaction& txTo, unsigned int nIn, const CAmount& amount, int nHashType);
bool SignSignature(const SigningProvider &provider, const CTransaction& txFrom, CMutableTransaction& txTo, unsigned int nIn, int nHashType);
/** Extract signature data from a transaction input, and insert it. */
SignatureData DataFromTransaction(const CMutableTransaction& tx, unsigned int nIn, const CTxOut& txout);
void UpdateInput(CTxIn& input, const SignatureData& data);
/* Check whether we know how to sign for an output like this, assuming we
* have all private keys. While this function does not need private keys, the passed
* provider is used to look up public keys and redeemscripts by hash.
* Solvability is unrelated to whether we consider this output to be ours. */
bool IsSolvable(const SigningProvider& provider, const CScript& script);
/** Check whether a scriptPubKey is known to be segwit. */
bool IsSegWitOutput(const SigningProvider& provider, const CScript& script);
/** Sign the CMutableTransaction */
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
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