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 <keystore.h>
  
  #include <util.h>
  
  bool CKeyStore::AddKey(const CKey &key) {
      return AddKeyPubKey(key, key.GetPubKey());
  }
  
  bool CBasicKeyStore::GetPubKey(const CKeyID &address, CPubKey &vchPubKeyOut) const
  {
      CKey key;
      if (!GetKey(address, key)) {
          LOCK(cs_KeyStore);
          WatchKeyMap::const_iterator it = mapWatchKeys.find(address);
          if (it != mapWatchKeys.end()) {
              vchPubKeyOut = it->second;
              return true;
          }
          return false;
      }
      vchPubKeyOut = key.GetPubKey();
      return true;
  }
  
  bool CBasicKeyStore::AddKeyPubKey(const CKey& key, const CPubKey &pubkey)
  {
      LOCK(cs_KeyStore);
      mapKeys[pubkey.GetID()] = key;
      return true;
  }
  
  bool CBasicKeyStore::HaveKey(const CKeyID &address) const
  {
      LOCK(cs_KeyStore);
      return mapKeys.count(address) > 0;
  }
  
  std::set<CKeyID> CBasicKeyStore::GetKeys() const
  {
      LOCK(cs_KeyStore);
      std::set<CKeyID> set_address;
      for (const auto& mi : mapKeys) {
          set_address.insert(mi.first);
      }
      return set_address;
  }
  
  bool CBasicKeyStore::GetKey(const CKeyID &address, CKey &keyOut) const
  {
      LOCK(cs_KeyStore);
      KeyMap::const_iterator mi = mapKeys.find(address);
      if (mi != mapKeys.end()) {
          keyOut = mi->second;
          return true;
      }
      return false;
  }
  
  bool CBasicKeyStore::AddCScript(const CScript& redeemScript)
  {
      if (redeemScript.size() > MAX_SCRIPT_ELEMENT_SIZE)
          return error("CBasicKeyStore::AddCScript(): redeemScripts > %i bytes are invalid", MAX_SCRIPT_ELEMENT_SIZE);
  
      LOCK(cs_KeyStore);
      mapScripts[CScriptID(redeemScript)] = redeemScript;
      return true;
  }
  
  bool CBasicKeyStore::HaveCScript(const CScriptID& hash) const
  {
      LOCK(cs_KeyStore);
      return mapScripts.count(hash) > 0;
  }
  
  std::set<CScriptID> CBasicKeyStore::GetCScripts() const
  {
      LOCK(cs_KeyStore);
      std::set<CScriptID> set_script;
      for (const auto& mi : mapScripts) {
          set_script.insert(mi.first);
      }
      return set_script;
  }
  
  bool CBasicKeyStore::GetCScript(const CScriptID &hash, CScript& redeemScriptOut) const
  {
      LOCK(cs_KeyStore);
      ScriptMap::const_iterator mi = mapScripts.find(hash);
      if (mi != mapScripts.end())
      {
          redeemScriptOut = (*mi).second;
          return true;
      }
      return false;
  }
  
  static bool ExtractPubKey(const CScript &dest, CPubKey& pubKeyOut)
  {
      //TODO: Use Solver to extract this?
      CScript::const_iterator pc = dest.begin();
      opcodetype opcode;
      std::vector<unsigned char> vch;
      if (!dest.GetOp(pc, opcode, vch) || vch.size() < 33 || vch.size() > 65)
          return false;
      pubKeyOut = CPubKey(vch);
      if (!pubKeyOut.IsFullyValid())
          return false;
      if (!dest.GetOp(pc, opcode, vch) || opcode != OP_CHECKSIG || dest.GetOp(pc, opcode, vch))
          return false;
      return true;
  }
  
  bool CBasicKeyStore::AddWatchOnly(const CScript &dest)
  {
      LOCK(cs_KeyStore);
      setWatchOnly.insert(dest);
      CPubKey pubKey;
      if (ExtractPubKey(dest, pubKey))
          mapWatchKeys[pubKey.GetID()] = pubKey;
      return true;
  }
  
  bool CBasicKeyStore::RemoveWatchOnly(const CScript &dest)
  {
      LOCK(cs_KeyStore);
      setWatchOnly.erase(dest);
      CPubKey pubKey;
      if (ExtractPubKey(dest, pubKey))
          mapWatchKeys.erase(pubKey.GetID());
      return true;
  }
  
  bool CBasicKeyStore::HaveWatchOnly(const CScript &dest) const
  {
      LOCK(cs_KeyStore);
      return setWatchOnly.count(dest) > 0;
  }
  
  bool CBasicKeyStore::HaveWatchOnly() const
  {
      LOCK(cs_KeyStore);
      return (!setWatchOnly.empty());
  }
  
  bool CBasicKeyStore::GetHDChain(CHDChain& hdChainRet) const
  {
      hdChainRet = hdChain;
      return !hdChain.IsNull();
  }
  