wallet_ismine.cpp

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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2014 The Bitcoin developers
// Copyright (c) 2015-2018 The PIVX developers
// Copyright (c) 2018-2020 The DAPS Project developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
#include "wallet/wallet_ismine.h"
 
#include "key.h"
#include "keystore.h"
#include "script/script.h"
#include "script/standard.h"
#include "util.h"
 
 
typedef std::vector<unsigned char> valtype;
 
unsigned int HaveKeys(const std::vector<valtype>& pubkeys, const CKeyStore& keystore)
{
    unsigned int nResult = 0;
    for (const valtype& pubkey : pubkeys) {
        CKeyID keyID = CPubKey(pubkey).GetID();
        if(keystore.HaveKey(keyID))
            ++nResult;
    }
    return nResult;
}
 
isminetype IsMine(const CKeyStore& keystore, const CTxDestination& dest)
{
    CScript script = GetScriptForDestination(dest);
    return IsMine(keystore, script);
}
 
isminetype IsMine(const CKeyStore& keystore, const CScript& scriptPubKey)
{
    if(keystore.HaveWatchOnly(scriptPubKey))
        return ISMINE_WATCH_ONLY;
 
    std::vector<valtype> vSolutions;
    txnouttype whichType;
    if(!Solver(scriptPubKey, whichType, vSolutions)) {
        if(keystore.HaveWatchOnly(scriptPubKey))
            return ISMINE_WATCH_ONLY;
 
        return ISMINE_NO;
    }
 
    CKeyID keyID;
    switch (whichType) {
    case TX_NONSTANDARD:
    case TX_NULL_DATA:
        break;
    case TX_PUBKEY:
        keyID = CPubKey(vSolutions[0]).GetID();
        if(keystore.HaveKey(keyID)) {
            return ISMINE_SPENDABLE;
        }
        break;
    case TX_PUBKEYHASH:
        keyID = CKeyID(uint160(vSolutions[0]));
        if(keystore.HaveKey(keyID))
            return ISMINE_SPENDABLE;
        break;
    case TX_SCRIPTHASH: {
        CScriptID scriptID = CScriptID(uint160(vSolutions[0]));
        CScript subscript;
        if(keystore.GetCScript(scriptID, subscript)) {
            isminetype ret = IsMine(keystore, subscript);
            if(ret != ISMINE_NO)
                return ret;
        }
        break;
    }
    case TX_MULTISIG: {
        // Only consider transactions "mine" if we own ALL the
        // keys involved. multi-signature transactions that are
        // partially owned (somebody else has a key that can spend
        // them) enable spend-out-from-under-you attacks, especially
        // in shared-wallet situations.
        std::vector<valtype> keys(vSolutions.begin() + 1, vSolutions.begin() + vSolutions.size() - 1);
        if(HaveKeys(keys, keystore) == keys.size())
            return ISMINE_SPENDABLE;
        break;
    }
    }
 
    if(keystore.HaveWatchOnly(scriptPubKey))
        return ISMINE_WATCH_ONLY;
 
    return ISMINE_NO;
}