standard.h

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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2020 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_STANDARD_H
#define BITCOIN_SCRIPT_STANDARD_H

#include <script/interpreter.h>
#include <uint256.h>

#include <string>
#include <variant>

static const bool DEFAULT_ACCEPT_DATACARRIER = true;

class CKeyID;
class CScript;
struct ScriptHash;

template<typename HashType>
class BaseHash
{
protected:
    HashType m_hash;

public:
    BaseHash() : m_hash() {}
    explicit BaseHash(const HashType& in) : m_hash(in) {}

    unsigned char* begin()
    {
        return m_hash.begin();
    }

    const unsigned char* begin() const
    {
        return m_hash.begin();
    }

    unsigned char* end()
    {
        return m_hash.end();
    }

    const unsigned char* end() const
    {
        return m_hash.end();
    }

    operator std::vector<unsigned char>() const
    {
        return std::vector<unsigned char>{m_hash.begin(), m_hash.end()};
    }

    std::string ToString() const
    {
        return m_hash.ToString();
    }

    bool operator==(const BaseHash<HashType>& other) const noexcept
    {
        return m_hash == other.m_hash;
    }

    bool operator!=(const BaseHash<HashType>& other) const noexcept
    {
        return !(m_hash == other.m_hash);
    }

    bool operator<(const BaseHash<HashType>& other) const noexcept
    {
        return m_hash < other.m_hash;
    }

    size_t size() const
    {
        return m_hash.size();
    }

    unsigned char* data() { return m_hash.data(); }
    const unsigned char* data() const { return m_hash.data(); }
};

class CScriptID : public BaseHash<uint160>
{
public:
    CScriptID() : BaseHash() {}
    explicit CScriptID(const CScript& in);
    explicit CScriptID(const uint160& in) : BaseHash(in) {}
    explicit CScriptID(const ScriptHash& in);
};

static const unsigned int MAX_OP_RETURN_RELAY = 83;

extern bool fAcceptDatacarrier;

extern unsigned nMaxDatacarrierBytes;

static const unsigned int MANDATORY_SCRIPT_VERIFY_FLAGS = SCRIPT_VERIFY_P2SH;

enum class TxoutType {
    NONSTANDARD,
    // 'standard' transaction types:
    PUBKEY,
    PUBKEYHASH,
    SCRIPTHASH,
    MULTISIG,
    NULL_DATA, 
    WITNESS_V0_SCRIPTHASH,
    WITNESS_V0_KEYHASH,
    WITNESS_V1_TAPROOT,
    WITNESS_UNKNOWN, 
};

class CNoDestination {
public:
    friend bool operator==(const CNoDestination &a, const CNoDestination &b) { return true; }
    friend bool operator<(const CNoDestination &a, const CNoDestination &b) { return true; }
};

struct PKHash : public BaseHash<uint160>
{
    PKHash() : BaseHash() {}
    explicit PKHash(const uint160& hash) : BaseHash(hash) {}
    explicit PKHash(const CPubKey& pubkey);
    explicit PKHash(const CKeyID& pubkey_id);
};
CKeyID ToKeyID(const PKHash& key_hash);

struct WitnessV0KeyHash;
struct ScriptHash : public BaseHash<uint160>
{
    ScriptHash() : BaseHash() {}
    // These don't do what you'd expect.
    // Use ScriptHash(GetScriptForDestination(...)) instead.
    explicit ScriptHash(const WitnessV0KeyHash& hash) = delete;
    explicit ScriptHash(const PKHash& hash) = delete;

    explicit ScriptHash(const uint160& hash) : BaseHash(hash) {}
    explicit ScriptHash(const CScript& script);
    explicit ScriptHash(const CScriptID& script);
};

struct WitnessV0ScriptHash : public BaseHash<uint256>
{
    WitnessV0ScriptHash() : BaseHash() {}
    explicit WitnessV0ScriptHash(const uint256& hash) : BaseHash(hash) {}
    explicit WitnessV0ScriptHash(const CScript& script);
};

struct WitnessV0KeyHash : public BaseHash<uint160>
{
    WitnessV0KeyHash() : BaseHash() {}
    explicit WitnessV0KeyHash(const uint160& hash) : BaseHash(hash) {}
    explicit WitnessV0KeyHash(const CPubKey& pubkey);
    explicit WitnessV0KeyHash(const PKHash& pubkey_hash);
};
CKeyID ToKeyID(const WitnessV0KeyHash& key_hash);

struct WitnessUnknown
{
    unsigned int version;
    unsigned int length;
    unsigned char program[40];

    friend bool operator==(const WitnessUnknown& w1, const WitnessUnknown& w2) {
        if (w1.version != w2.version) return false;
        if (w1.length != w2.length) return false;
        return std::equal(w1.program, w1.program + w1.length, w2.program);
    }

    friend bool operator<(const WitnessUnknown& w1, const WitnessUnknown& w2) {
        if (w1.version < w2.version) return true;
        if (w1.version > w2.version) return false;
        if (w1.length < w2.length) return true;
        if (w1.length > w2.length) return false;
        return std::lexicographical_compare(w1.program, w1.program + w1.length, w2.program, w2.program + w2.length);
    }
};

using CTxDestination = std::variant<CNoDestination, PKHash, ScriptHash, WitnessV0ScriptHash, WitnessV0KeyHash, WitnessUnknown>;

bool IsValidDestination(const CTxDestination& dest);

std::string GetTxnOutputType(TxoutType t);

TxoutType Solver(const CScript& scriptPubKey, std::vector<std::vector<unsigned char>>& vSolutionsRet);

bool ExtractDestination(const CScript& scriptPubKey, CTxDestination& addressRet);

bool ExtractDestinations(const CScript& scriptPubKey, TxoutType& typeRet, std::vector<CTxDestination>& addressRet, int& nRequiredRet);

CScript GetScriptForDestination(const CTxDestination& dest);

CScript GetScriptForRawPubKey(const CPubKey& pubkey);

CScript GetScriptForMultisig(int nRequired, const std::vector<CPubKey>& keys);

#endif // BITCOIN_SCRIPT_STANDARD_H