benchmark2/integer overflow/1369.sol

pragma solidity ^0.4.18;


contract Ownable {
    address public owner;


    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);


    
    function Ownable() public {
        owner = msg.sender;
    }


    
    modifier onlyOwner() {
        require(msg.sender == owner);
        _;
    }


    
    function transferOwnership(address newOwner) public onlyOwner {
        require(newOwner != address(0));
        OwnershipTransferred(owner, newOwner);
        owner = newOwner;
    }

}



library SafeMath {
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }
        uint256 c = a * b;
        assert(c / a == b);
        return c;
    }

    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        
        uint256 c = a / b;
        
        return c;
    }

    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        assert(b <= a);
        return a - b;
    }

    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        assert(c >= a);
        return c;
    }
}



contract Destructible is Ownable {

  function Destructible() public payable { }

  
  function destroy() onlyOwner public {
    selfdestruct(owner);
  }

  function destroyAndSend(address _recipient) onlyOwner public {
    selfdestruct(_recipient);
  }
}



contract ERC20Basic {
    uint256 public totalSupply;
    function balanceOf(address who) public view returns (uint256);
    function transfer(address to, uint256 value) public returns (bool);
    event Transfer(address indexed from, address indexed to, uint256 value);
}




contract ERC20 is ERC20Basic {
    function allowance(address owner, address spender) public view returns (uint256);
    function transferFrom(address from, address to, uint256 value) public returns (bool);
    function approve(address spender, uint256 value) public returns (bool);
    event Approval(address indexed owner, address indexed spender, uint256 value);
}




contract BasicToken is ERC20Basic {
    using SafeMath for uint256;

    mapping(address => uint256) public balances;

    
    function transfer(address _to, uint256 _value) public returns (bool) {
        require(_to != address(0));
        require(_value <= balances[msg.sender]);

        
        balances[msg.sender] = balances[msg.sender].sub(_value);
        balances[_to] = balances[_to].add(_value);
        Transfer(msg.sender, _to, _value);
        return true;
    }

    
    function balanceOf(address _owner) public view returns (uint256 balance) {
        return balances[_owner];
    }

}




contract StandardToken is ERC20, BasicToken {

    mapping (address => mapping (address => uint256)) internal allowed;


    
    function transferFrom(address _from, address _to, uint256 _value) public returns (bool) {
        require(_to != address(0));
        require(_value <= balances[_from]);
        require(_value <= allowed[_from][msg.sender]);

        balances[_from] = balances[_from].sub(_value);
        balances[_to] = balances[_to].add(_value);
        allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
        Transfer(_from, _to, _value);
        return true;
    }

    
    function approve(address _spender, uint256 _value) public returns (bool) {
        allowed[msg.sender][_spender] = _value;
        Approval(msg.sender, _spender, _value);
        return true;
    }

    
    function allowance(address _owner, address _spender) public view returns (uint256) {
        return allowed[_owner][_spender];
    }

    
    function increaseApproval(address _spender, uint _addedValue) public returns (bool) {
        allowed[msg.sender][_spender] = allowed[msg.sender][_spender].add(_addedValue);
        Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
        return true;
    }

    function decreaseApproval(address _spender, uint _subtractedValue) public returns (bool) {
        uint oldValue = allowed[msg.sender][_spender];
        if (_subtractedValue > oldValue) {
            allowed[msg.sender][_spender] = 0;
        } else {
            allowed[msg.sender][_spender] = oldValue.sub(_subtractedValue);
        }
        Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
        return true;
    }

}




contract MintableToken is StandardToken, Ownable {

    uint256 public hardCap;

    event Mint(address indexed to, uint256 amount);
    event MintFinished();

    bool public mintingFinished = false;


    modifier canMint() {
        require(!mintingFinished);
        _;
    }

    
    function mint(address _to, uint256 _amount) onlyOwner canMint public returns (bool) {
        totalSupply = totalSupply.add(_amount);
        balances[_to] = balances[_to].add(_amount);
        Mint(_to, _amount);
        Transfer(address(0), _to, _amount);
        return true;
    }

    
    function finishMinting() onlyOwner canMint public returns (bool) {
        mintingFinished = true;
        MintFinished();
        return true;
    }
}




contract KryptoroToken is MintableToken, Destructible {

    string public constant name = "KRYPTORO Coin";
    string public constant symbol = "KTO";
    uint8 public constant decimals = 18;

    
    function KryptoroToken() public {
        hardCap = 100 * 1000000 * (10 ** uint256(decimals));
    }


    
    function mint(address _to, uint256 _amount) onlyOwner canMint public returns (bool) {
        require(totalSupply.add(_amount) <= hardCap);

        return super.mint(_to, _amount);
    }
}



contract KTOCrowdsale is Ownable{
  using SafeMath for uint256;

  
  KryptoroToken public token;

  
  uint256 public startTime;
  uint256 public endTime;
    
  
  address public wallet;

  
  uint256 public rate;

  
  uint256 public weiRaised;

  
  event TokenPurchase(address indexed purchaser, address indexed beneficiary, uint256 value, uint256 amount);

  event TokenContractUpdated(bool state);

  event WalletAddressUpdated(bool state);

  function KTOCrowdsale() public {
    token = createTokenContract();
    startTime = 1532332800;
    endTime = 1539590400;
    rate = 612;
    wallet = 0x34367d515ff223a27985518f2780cccc4a7e0fc9;
  }

  
  
  function createTokenContract() internal returns (KryptoroToken) {
    return new KryptoroToken();
  }


  
  function () external payable {
    buyTokens(msg.sender);
  }

  
  function buyTokens(address beneficiary) public payable {
    require(beneficiary != address(0));
    require(validPurchase());

    uint256 weiAmount = msg.value;

    
    uint256 tokens = weiAmount.mul(rate);

    
    weiRaised = weiRaised.add(weiAmount);

    token.mint(beneficiary, tokens);
    TokenPurchase(msg.sender, beneficiary, weiAmount, tokens);

    forwardFunds();
  }

  
  
  function forwardFunds() internal {
    wallet.transfer(msg.value);
  }

  
  function validPurchase() internal view returns (bool) {
    bool nonZeroPurchase = msg.value != 0;
    bool withinPeriod = now >= startTime && now <= endTime;
    
    return nonZeroPurchase && withinPeriod;
  }
  
  
  function hasEnded() public view returns (bool) {
      bool timeEnded = now > endTime;

      return timeEnded;
  }
  
  
   function updateKryptoroToken(address _tokenAddress) onlyOwner{
      require(_tokenAddress != address(0));
      token.transferOwnership(_tokenAddress);

      TokenContractUpdated(true);
  }
  
  
  function updateWalletAddress(address _newWallet) onlyOwner {
      require(_newWallet != address(0));
      wallet = _newWallet;

      WalletAddressUpdated(true);
  }
}