text: // Copyright (c) 2009-2010 Satoshi Nakamoto
  // Copyright (c) 2009-2015 The Bitcoin Core developers
  // Distributed under the MIT software license, see the accompanying
  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
  
  #include <script/ismine.h>
  
  #include <base58.h>
  #include <key.h>
  #include <keystore.h>
  #include <script/script.h>
  #include <script/standard.h>
  #include <script/sign.h>
  
  using namespace std;
  
  typedef vector<unsigned char> valtype;
  
  unsigned int HaveKeys(const 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)
  {
      vector<valtype> vSolutions;
      txnouttype whichType;
      if (!Solver(scriptPubKey, whichType, vSolutions)) {
          if (keystore.HaveWatchOnly(scriptPubKey))
              return ISMINE_WATCH_UNSOLVABLE;
          return ISMINE_NO;
      }
  
      CKeyID keyID;
      CKeyID keyID2;
      switch (whichType)
      {
      case TX_NONSTANDARD:
      case TX_NULL_DATA:
      case TX_POOL:
      case TX_CONTRIBUTION:
      case TX_PROPOSALNOVOTE:
      case TX_PROPOSALYESVOTE:
      case TX_PAYMENTREQUESTNOVOTE:
      case TX_PAYMENTREQUESTYESVOTE:
      case TX_PROPOSALABSVOTE:
      case TX_PROPOSALREMOVEVOTE:
      case TX_PAYMENTREQUESTABSVOTE:
      case TX_PAYMENTREQUESTREMOVEVOTE:
      case TX_CONSULTATIONVOTE:
      case TX_DAOSUPPORTREMOVE:
      case TX_CONSULTATIONVOTEREMOVE:
      case TX_CONSULTATIONVOTEABSTENTION:
      case TX_DAOSUPPORT:
          break;
      case TX_PUBKEY:
          keyID = CPubKey(vSolutions[0]).GetID();
          if (keystore.HaveKey(keyID))
              return ISMINE_SPENDABLE;
          break;
      case TX_PUBKEYHASH:
      case TX_WITNESS_V0_KEYHASH:
          keyID = CKeyID(uint160(vSolutions[0]));
          if (keystore.HaveKey(keyID))
              return ISMINE_SPENDABLE;
          break;
      case TX_COLDSTAKING_V2:
      case TX_COLDSTAKING: {
          keyID = CKeyID(uint160(vSolutions[1]));
          keyID2 = CKeyID(uint160(vSolutions[0]));
          bool fSpendable = keystore.HaveKey(keyID);
          bool fStakable = keystore.HaveKey(keyID2);
          if (fSpendable && fStakable)
              return ISMINE_SPENDABLE_STAKABLE;
          else if (fSpendable)
              return ISMINE_SPENDABLE;
          else if (fStakable)
              return ISMINE_STAKABLE;
  
          // if spending/staking address is being watched
          CElectrumAddress spendingAddress(keyID);
          CElectrumAddress stakingAddress(keyID2);
          CScript spendingScript = GetScriptForDestination(spendingAddress.Get());
          CScript stakingScript = GetScriptForDestination(stakingAddress.Get());
          SignatureData sigs;
  
          if (keystore.HaveWatchOnly(spendingScript)) {
              return ProduceSignature(DummySignatureCreator(&keystore), spendingScript, sigs) ? ISMINE_WATCH_SOLVABLE : ISMINE_WATCH_UNSOLVABLE;
          } else if (keystore.HaveWatchOnly(stakingScript)) {
              return ProduceSignature(DummySignatureCreator(&keystore), stakingScript, sigs) ? ISMINE_WATCH_SOLVABLE : ISMINE_WATCH_UNSOLVABLE;
          }
  
          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_SPENDABLE)
                  return ret;
          }
          break;
      }
      case TX_WITNESS_V0_SCRIPTHASH:
      {
          uint160 hash;
          CRIPEMD160().Write(&vSolutions[0][0], vSolutions[0].size()).Finalize(hash.begin());
          CScriptID scriptID = CScriptID(hash);
          CScript subscript;
          if (keystore.GetCScript(scriptID, subscript)) {
              isminetype ret = IsMine(keystore, subscript);
              if (ret == ISMINE_SPENDABLE)
                  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.
          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)) {
          // TODO: This could be optimized some by doing some work after the above solver
          SignatureData sigs;
          return ProduceSignature(DummySignatureCreator(&keystore), scriptPubKey, sigs) ? ISMINE_WATCH_SOLVABLE : ISMINE_WATCH_UNSOLVABLE;
      }
      return ISMINE_NO;
  }
  