pragma solidity ^0.4.13;

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

  function div(uint256 a, uint256 b) internal constant returns (uint256) {
    // assert(b > 0); // Solidity automatically throws when dividing by 0
    uint256 c = a / b;
    // assert(a == b * c + a % b); // There is no case in which this doesn't hold
    return c;
  }

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

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

contract ContributorApprover {
    KyberContributorWhitelist public list;
    mapping(address=>uint)    public participated;

    uint                      public cappedSaleStartTime;
    uint                      public openSaleStartTime;
    uint                      public openSaleEndTime;

    using SafeMath for uint;


    function ContributorApprover( KyberContributorWhitelist _whitelistContract,
                                  uint                      _cappedSaleStartTime,
                                  uint                      _openSaleStartTime,
                                  uint                      _openSaleEndTime ) {
        list = _whitelistContract;
        cappedSaleStartTime = _cappedSaleStartTime;
        openSaleStartTime = _openSaleStartTime;
        openSaleEndTime = _openSaleEndTime;

        require( list != KyberContributorWhitelist(0x0) );
        require( cappedSaleStartTime < openSaleStartTime );
        require(  openSaleStartTime < openSaleEndTime );
    }

    // this is a seperate function so user could query it before crowdsale starts
    function contributorCap( address contributor ) constant returns(uint) {
        return list.getCap( contributor );
    }

    function eligible( address contributor, uint amountInWei ) constant returns(uint) {
        if( now < cappedSaleStartTime ) return 0;
        if( now >= openSaleEndTime ) return 0;

        uint cap = contributorCap( contributor );

        if( cap == 0 ) return 0;
        if( now < openSaleStartTime ) {
            uint remainedCap = cap.sub( participated[ contributor ] );

            if( remainedCap > amountInWei ) return amountInWei;
            else return remainedCap;
        }
        else {
            return amountInWei;
        }
    }

    function eligibleTestAndIncrement( address contributor, uint amountInWei ) internal returns(uint) {
        uint result = eligible( contributor, amountInWei );
        participated[contributor] = participated[contributor].add( result );

        return result;
    }

    function saleEnded() constant returns(bool) {
        return now > openSaleEndTime;
    }

    function saleStarted() constant returns(bool) {
        return now >= cappedSaleStartTime;
    }
}

contract KyberNetworkTokenSale is ContributorApprover {
    address             public admin;
    address             public kyberMultiSigWallet;
    KyberNetworkCrystal public token;
    uint                public raisedWei;
    bool                public haltSale;

    mapping(bytes32=>uint) public proxyPurchases;

    function KyberNetworkTokenSale( address _admin,
                                    address _kyberMultiSigWallet,
                                    KyberContributorWhitelist _whilteListContract,
                                    uint _totalTokenSupply,
                                    uint _premintedTokenSupply,
                                    uint _cappedSaleStartTime,
                                    uint _publicSaleStartTime,
                                    uint _publicSaleEndTime )

        ContributorApprover( _whilteListContract,
                             _cappedSaleStartTime,
                             _publicSaleStartTime,
                             _publicSaleEndTime )
    {
        admin = _admin;
        kyberMultiSigWallet = _kyberMultiSigWallet;

        token = new KyberNetworkCrystal( _totalTokenSupply,
                                         _cappedSaleStartTime,
                                         _publicSaleEndTime + 7 days,
                                         _admin );

        // transfer preminted tokens to company wallet
        token.transfer( kyberMultiSigWallet, _premintedTokenSupply );
    }

    function setHaltSale( bool halt ) {
        require( msg.sender == admin );
        haltSale = halt;
    }

    function() payable {
        buy( msg.sender );
    }

    event ProxyBuy( bytes32 indexed _proxy, address _recipient, uint _amountInWei );
    function proxyBuy( bytes32 proxy, address recipient ) payable returns(uint){
        uint amount = buy( recipient );
        proxyPurchases[proxy] = proxyPurchases[proxy].add(amount);
        ProxyBuy( proxy, recipient, amount );

        return amount;
    }

    event Buy( address _buyer, uint _tokens, uint _payedWei );
    function buy( address recipient ) payable returns(uint){
        require( tx.gasprice <= 50000000000 wei );

        require( ! haltSale );
        require( saleStarted() );
        require( ! saleEnded() );

        uint weiPayment = eligibleTestAndIncrement( recipient, msg.value );

        require( weiPayment > 0 );

        // send to msg.sender, not to recipient
        if( msg.value > weiPayment ) {
            msg.sender.transfer( msg.value.sub( weiPayment ) );
        }

        // send payment to wallet
        sendETHToMultiSig( weiPayment );
        raisedWei = raisedWei.add( weiPayment );
        uint recievedTokens = weiPayment.mul( 600 );

        assert( token.transfer( recipient, recievedTokens ) );


        Buy( recipient, recievedTokens, weiPayment );

        return weiPayment;
    }

    function sendETHToMultiSig( uint value ) internal {
        kyberMultiSigWallet.transfer( value );
    }

    event FinalizeSale();
    // function is callable by everyone
    function finalizeSale() {
        require( saleEnded() );
        require( msg.sender == admin );

        // burn remaining tokens
        token.burn(token.balanceOf(this));

        FinalizeSale();
    }

    // ETH balance is always expected to be 0.
    // but in case something went wrong, we use this function to extract the eth.
    function emergencyDrain(ERC20 anyToken) returns(bool){
        require( msg.sender == admin );
        require( saleEnded() );

        if( this.balance > 0 ) {
            sendETHToMultiSig( this.balance );
        }

        if( anyToken != address(0x0) ) {
            assert( anyToken.transfer(kyberMultiSigWallet, anyToken.balanceOf(this)) );
        }

        return true;
    }

    // just to check that funds goes to the right place
    // tokens are not given in return
    function debugBuy() payable {
        require( msg.value == 123 );
        sendETHToMultiSig( msg.value );
    }
}

contract Ownable {
  address public owner;


  /**
   * @dev The Ownable constructor sets the original `owner` of the contract to the sender
   * account.
   */
  function Ownable() {
    owner = msg.sender;
  }


  /**
   * @dev Throws if called by any account other than the owner.
   */
  modifier onlyOwner() {
    require(msg.sender == owner);
    _;
  }


  /**
   * @dev Allows the current owner to transfer control of the contract to a newOwner.
   * @param newOwner The address to transfer ownership to.
   */
  function transferOwnership(address newOwner) onlyOwner {
    if (newOwner != address(0)) {
      owner = newOwner;
    }
  }

}

contract KyberContributorWhitelist is Ownable {
    // cap is in wei. The value of 7 is just a stub.
    // after kyc registration ends, we change it to the actual value with setSlackUsersCap
    uint public slackUsersCap = 7;
    mapping(address=>uint) public addressCap;

    function KyberContributorWhitelist() {}

    event ListAddress( address _user, uint _cap, uint _time );

    // Owner can delist by setting cap = 0.
    // Onwer can also change it at any time
    function listAddress( address _user, uint _cap ) onlyOwner {
        addressCap[_user] = _cap;
        ListAddress( _user, _cap, now );
    }

    // an optimization in case of network congestion
    function listAddresses( address[] _users, uint[] _cap ) onlyOwner {
        require(_users.length == _cap.length );
        for( uint i = 0 ; i < _users.length ; i++ ) {
            listAddress( _users[i], _cap[i] );
        }
    }

    function setSlackUsersCap( uint _cap ) onlyOwner {
        slackUsersCap = _cap;
    }

    function getCap( address _user ) constant returns(uint) {
        uint cap = addressCap[_user];

        if( cap == 1 ) return slackUsersCap;
        else return cap;
    }

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

contract ERC20Basic {
  uint256 public totalSupply;
  function balanceOf(address who) constant returns (uint256);
  function transfer(address to, uint256 value) returns (bool);
  
  // KYBER-NOTE! code changed to comply with ERC20 standard
  event Transfer(address indexed _from, address indexed _to, uint _value);
  //event Transfer(address indexed from, address indexed to, uint256 value);
}

contract BasicToken is ERC20Basic {
  using SafeMath for uint256;

  mapping(address => uint256) balances;

  /**
  * @dev transfer token for a specified address
  * @param _to The address to transfer to.
  * @param _value The amount to be transferred.
  */
  function transfer(address _to, uint256 _value) returns (bool) {
    balances[msg.sender] = balances[msg.sender].sub(_value);
    balances[_to] = balances[_to].add(_value);
    Transfer(msg.sender, _to, _value);
    return true;
  }

  /**
  * @dev Gets the balance of the specified address.
  * @param _owner The address to query the the balance of. 
  * @return An uint256 representing the amount owned by the passed address.
  */
  function balanceOf(address _owner) constant returns (uint256 balance) {
    return balances[_owner];
  }

}

contract ERC20 is ERC20Basic {
  function allowance(address owner, address spender) constant returns (uint256);
  function transferFrom(address from, address to, uint256 value) returns (bool);
  function approve(address spender, uint256 value) returns (bool);
  
  // KYBER-NOTE! code changed to comply with ERC20 standard
  event Approval(address indexed _owner, address indexed _spender, uint _value);
  //event Approval(address indexed owner, address indexed spender, uint256 value);
}

contract StandardToken is ERC20, BasicToken {

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


  /**
   * @dev Transfer tokens from one address to another
   * @param _from address The address which you want to send tokens from
   * @param _to address The address which you want to transfer to
   * @param _value uint256 the amout of tokens to be transfered
   */
  function transferFrom(address _from, address _to, uint256 _value) returns (bool) {
    var _allowance = allowed[_from][msg.sender];

    // Check is not needed because sub(_allowance, _value) will already throw if this condition is not met
    // require (_value <= _allowance);

    // KYBER-NOTE! code changed to comply with ERC20 standard
    balances[_from] = balances[_from].sub(_value);
    balances[_to] = balances[_to].add(_value);
    //balances[_from] = balances[_from].sub(_value); // this was removed
    allowed[_from][msg.sender] = _allowance.sub(_value);
    Transfer(_from, _to, _value);
    return true;
  }

  /**
   * @dev Aprove the passed address to spend the specified amount of tokens on behalf of msg.sender.
   * @param _spender The address which will spend the funds.
   * @param _value The amount of tokens to be spent.
   */
  function approve(address _spender, uint256 _value) returns (bool) {

    // To change the approve amount you first have to reduce the addresses`
    //  allowance to zero by calling `approve(_spender, 0)` if it is not
    //  already 0 to mitigate the race condition described here:
    //  https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
    require((_value == 0) || (allowed[msg.sender][_spender] == 0));

    allowed[msg.sender][_spender] = _value;
    Approval(msg.sender, _spender, _value);
    return true;
  }

  /**
   * @dev Function to check the amount of tokens that an owner allowed to a spender.
   * @param _owner address The address which owns the funds.
   * @param _spender address The address which will spend the funds.
   * @return A uint256 specifing the amount of tokens still avaible for the spender.
   */
  function allowance(address _owner, address _spender) constant returns (uint256 remaining) {
    return allowed[_owner][_spender];
  }

}

contract KyberNetworkCrystal is StandardToken, Ownable {
    string  public  constant name = "Kyber Network Crystal";
    string  public  constant symbol = "KNC";
    uint    public  constant decimals = 18;

    uint    public  saleStartTime;
    uint    public  saleEndTime;

    address public  tokenSaleContract;

    modifier onlyWhenTransferEnabled() {
        if( now <= saleEndTime && now >= saleStartTime ) {
            require( msg.sender == tokenSaleContract );
        }
        _;
    }

    modifier validDestination( address to ) {
        require(to != address(0x0));
        require(to != address(this) );
        _;
    }

    function KyberNetworkCrystal( uint tokenTotalAmount, uint startTime, uint endTime, address admin ) {
        // Mint all tokens. Then disable minting forever.
        balances[msg.sender] = tokenTotalAmount;
        totalSupply = tokenTotalAmount;
        Transfer(address(0x0), msg.sender, tokenTotalAmount);

        saleStartTime = startTime;
        saleEndTime = endTime;

        tokenSaleContract = msg.sender;
        transferOwnership(admin); // admin could drain tokens that were sent here by mistake
    }

    function transfer(address _to, uint _value)
        onlyWhenTransferEnabled
        validDestination(_to)
        returns (bool) {
        return super.transfer(_to, _value);
    }

    function transferFrom(address _from, address _to, uint _value)
        onlyWhenTransferEnabled
        validDestination(_to)
        returns (bool) {
        return super.transferFrom(_from, _to, _value);
    }

    event Burn(address indexed _burner, uint _value);

    function burn(uint _value) onlyWhenTransferEnabled
        returns (bool){
        balances[msg.sender] = balances[msg.sender].sub(_value);
        totalSupply = totalSupply.sub(_value);
        Burn(msg.sender, _value);
        Transfer(msg.sender, address(0x0), _value);
        return true;
    }

    // save some gas by making only one contract call
    function burnFrom(address _from, uint256 _value) onlyWhenTransferEnabled
        returns (bool) {
        assert( transferFrom( _from, msg.sender, _value ) );
        return burn(_value);
    }

    function emergencyERC20Drain( ERC20 token, uint amount ) onlyOwner {
        token.transfer( owner, amount );
    }
}

pragma solidity 0.4.4;


/// @title Multisignature wallet - Allows multiple parties to agree on transactions before execution.
/// @author Stefan George - <stefan.george@consensys.net>
contract MultiSigWallet {

    uint constant public MAX_OWNER_COUNT = 50;

    event Confirmation(address indexed sender, uint indexed transactionId);
    event Revocation(address indexed sender, uint indexed transactionId);
    event Submission(uint indexed transactionId);
    event Execution(uint indexed transactionId);
    event ExecutionFailure(uint indexed transactionId);
    event Deposit(address indexed sender, uint value);
    event OwnerAddition(address indexed owner);
    event OwnerRemoval(address indexed owner);
    event RequirementChange(uint required);

    mapping (uint => Transaction) public transactions;
    mapping (uint => mapping (address => bool)) public confirmations;
    mapping (address => bool) public isOwner;
    address[] public owners;
    uint public required;
    uint public transactionCount;

    struct Transaction {
        address destination;
        uint value;
        bytes data;
        bool executed;
    }

    modifier onlyWallet() {
        if (msg.sender != address(this))
            throw;
        _;
    }

    modifier ownerDoesNotExist(address owner) {
        if (isOwner[owner])
            throw;
        _;
    }

    modifier ownerExists(address owner) {
        if (!isOwner[owner])
            throw;
        _;
    }

    modifier transactionExists(uint transactionId) {
        if (transactions[transactionId].destination == 0)
            throw;
        _;
    }

    modifier confirmed(uint transactionId, address owner) {
        if (!confirmations[transactionId][owner])
            throw;
        _;
    }

    modifier notConfirmed(uint transactionId, address owner) {
        if (confirmations[transactionId][owner])
            throw;
        _;
    }

    modifier notExecuted(uint transactionId) {
        if (transactions[transactionId].executed)
            throw;
        _;
    }

    modifier notNull(address _address) {
        if (_address == 0)
            throw;
        _;
    }

    modifier validRequirement(uint ownerCount, uint _required) {
        if (   ownerCount > MAX_OWNER_COUNT
            || _required > ownerCount
            || _required == 0
            || ownerCount == 0)
            throw;
        _;
    }

    /// @dev Fallback function allows to deposit ether.
    function()
        payable
    {
        if (msg.value > 0)
            Deposit(msg.sender, msg.value);
    }

    /*
     * Public functions
     */
    /// @dev Contract constructor sets initial owners and required number of confirmations.
    /// @param _owners List of initial owners.
    /// @param _required Number of required confirmations.
    function MultiSigWallet(address[] _owners, uint _required)
        public
        validRequirement(_owners.length, _required)
    {
        for (uint i=0; i<_owners.length; i++) {
            if (isOwner[_owners[i]] || _owners[i] == 0)
                throw;
            isOwner[_owners[i]] = true;
        }
        owners = _owners;
        required = _required;
    }

    /// @dev Allows to add a new owner. Transaction has to be sent by wallet.
    /// @param owner Address of new owner.
    function addOwner(address owner)
        public
        onlyWallet
        ownerDoesNotExist(owner)
        notNull(owner)
        validRequirement(owners.length + 1, required)
    {
        isOwner[owner] = true;
        owners.push(owner);
        OwnerAddition(owner);
    }

    /// @dev Allows to remove an owner. Transaction has to be sent by wallet.
    /// @param owner Address of owner.
    function removeOwner(address owner)
        public
        onlyWallet
        ownerExists(owner)
    {
        isOwner[owner] = false;
        for (uint i=0; i<owners.length - 1; i++)
            if (owners[i] == owner) {
                owners[i] = owners[owners.length - 1];
                break;
            }
        owners.length -= 1;
        if (required > owners.length)
            changeRequirement(owners.length);
        OwnerRemoval(owner);
    }

    /// @dev Allows to replace an owner with a new owner. Transaction has to be sent by wallet.
    /// @param owner Address of owner to be replaced.
    /// @param owner Address of new owner.
    function replaceOwner(address owner, address newOwner)
        public
        onlyWallet
        ownerExists(owner)
        ownerDoesNotExist(newOwner)
    {
        for (uint i=0; i<owners.length; i++)
            if (owners[i] == owner) {
                owners[i] = newOwner;
                break;
            }
        isOwner[owner] = false;
        isOwner[newOwner] = true;
        OwnerRemoval(owner);
        OwnerAddition(newOwner);
    }

    /// @dev Allows to change the number of required confirmations. Transaction has to be sent by wallet.
    /// @param _required Number of required confirmations.
    function changeRequirement(uint _required)
        public
        onlyWallet
        validRequirement(owners.length, _required)
    {
        required = _required;
        RequirementChange(_required);
    }

    /// @dev Allows an owner to submit and confirm a transaction.
    /// @param destination Transaction target address.
    /// @param value Transaction ether value.
    /// @param data Transaction data payload.
    /// @return Returns transaction ID.
    function submitTransaction(address destination, uint value, bytes data)
        public
        returns (uint transactionId)
    {
        transactionId = addTransaction(destination, value, data);
        confirmTransaction(transactionId);
    }

    /// @dev Allows an owner to confirm a transaction.
    /// @param transactionId Transaction ID.
    function confirmTransaction(uint transactionId)
        public
        ownerExists(msg.sender)
        transactionExists(transactionId)
        notConfirmed(transactionId, msg.sender)
    {
        confirmations[transactionId][msg.sender] = true;
        Confirmation(msg.sender, transactionId);
        executeTransaction(transactionId);
    }

    /// @dev Allows an owner to revoke a confirmation for a transaction.
    /// @param transactionId Transaction ID.
    function revokeConfirmation(uint transactionId)
        public
        ownerExists(msg.sender)
        confirmed(transactionId, msg.sender)
        notExecuted(transactionId)
    {
        confirmations[transactionId][msg.sender] = false;
        Revocation(msg.sender, transactionId);
    }

    /// @dev Allows anyone to execute a confirmed transaction.
    /// @param transactionId Transaction ID.
    function executeTransaction(uint transactionId)
        public
        notExecuted(transactionId)
    {
        if (isConfirmed(transactionId)) {
            Transaction tx = transactions[transactionId];
            tx.executed = true;
            if (tx.destination.call.value(tx.value)(tx.data))
                Execution(transactionId);
            else {
                ExecutionFailure(transactionId);
                tx.executed = false;
            }
        }
    }

    /// @dev Returns the confirmation status of a transaction.
    /// @param transactionId Transaction ID.
    /// @return Confirmation status.
    function isConfirmed(uint transactionId)
        public
        constant
        returns (bool)
    {
        uint count = 0;
        for (uint i=0; i<owners.length; i++) {
            if (confirmations[transactionId][owners[i]])
                count += 1;
            if (count == required)
                return true;
        }
    }

    /*
     * Internal functions
     */
    /// @dev Adds a new transaction to the transaction mapping, if transaction does not exist yet.
    /// @param destination Transaction target address.
    /// @param value Transaction ether value.
    /// @param data Transaction data payload.
    /// @return Returns transaction ID.
    function addTransaction(address destination, uint value, bytes data)
        internal
        notNull(destination)
        returns (uint transactionId)
    {
        transactionId = transactionCount;
        transactions[transactionId] = Transaction({
            destination: destination,
            value: value,
            data: data,
            executed: false
        });
        transactionCount += 1;
        Submission(transactionId);
    }

    /*
     * Web3 call functions
     */
    /// @dev Returns number of confirmations of a transaction.
    /// @param transactionId Transaction ID.
    /// @return Number of confirmations.
    function getConfirmationCount(uint transactionId)
        public
        constant
        returns (uint count)
    {
        for (uint i=0; i<owners.length; i++)
            if (confirmations[transactionId][owners[i]])
                count += 1;
    }

    /// @dev Returns total number of transactions after filers are applied.
    /// @param pending Include pending transactions.
    /// @param executed Include executed transactions.
    /// @return Total number of transactions after filters are applied.
    function getTransactionCount(bool pending, bool executed)
        public
        constant
        returns (uint count)
    {
        for (uint i=0; i<transactionCount; i++)
            if (   pending && !transactions[i].executed
                || executed && transactions[i].executed)
                count += 1;
    }

    /// @dev Returns list of owners.
    /// @return List of owner addresses.
    function getOwners()
        public
        constant
        returns (address[])
    {
        return owners;
    }

    /// @dev Returns array with owner addresses, which confirmed transaction.
    /// @param transactionId Transaction ID.
    /// @return Returns array of owner addresses.
    function getConfirmations(uint transactionId)
        public
        constant
        returns (address[] _confirmations)
    {
        address[] memory confirmationsTemp = new address[](owners.length);
        uint count = 0;
        uint i;
        for (i=0; i<owners.length; i++)
            if (confirmations[transactionId][owners[i]]) {
                confirmationsTemp[count] = owners[i];
                count += 1;
            }
        _confirmations = new address[](count);
        for (i=0; i<count; i++)
            _confirmations[i] = confirmationsTemp[i];
    }

    /// @dev Returns list of transaction IDs in defined range.
    /// @param from Index start position of transaction array.
    /// @param to Index end position of transaction array.
    /// @param pending Include pending transactions.
    /// @param executed Include executed transactions.
    /// @return Returns array of transaction IDs.
    function getTransactionIds(uint from, uint to, bool pending, bool executed)
        public
        constant
        returns (uint[] _transactionIds)
    {
        uint[] memory transactionIdsTemp = new uint[](transactionCount);
        uint count = 0;
        uint i;
        for (i=0; i<transactionCount; i++)
            if (   pending && !transactions[i].executed
                || executed && transactions[i].executed)
            {
                transactionIdsTemp[count] = i;
                count += 1;
            }
        _transactionIds = new uint[](to - from);
        for (i=from; i<to; i++)
            _transactionIds[i - from] = transactionIdsTemp[i];
    }
}

/// @title Multisignature wallet with daily limit - Allows an owner to withdraw a daily limit without multisig.
/// @author Stefan George - <stefan.george@consensys.net>
contract MultiSigWalletWithDailyLimit is MultiSigWallet {

    event DailyLimitChange(uint dailyLimit);

    uint public dailyLimit;
    uint public lastDay;
    uint public spentToday;

    /*
     * Public functions
     */
    /// @dev Contract constructor sets initial owners, required number of confirmations and daily withdraw limit.
    /// @param _owners List of initial owners.
    /// @param _required Number of required confirmations.
    /// @param _dailyLimit Amount in wei, which can be withdrawn without confirmations on a daily basis.
    function MultiSigWalletWithDailyLimit(address[] _owners, uint _required, uint _dailyLimit)
        public
        MultiSigWallet(_owners, _required)
    {
        dailyLimit = _dailyLimit;
    }

    /// @dev Allows to change the daily limit. Transaction has to be sent by wallet.
    /// @param _dailyLimit Amount in wei.
    function changeDailyLimit(uint _dailyLimit)
        public
        onlyWallet
    {
        dailyLimit = _dailyLimit;
        DailyLimitChange(_dailyLimit);
    }

    /// @dev Allows anyone to execute a confirmed transaction or ether withdraws until daily limit is reached.
    /// @param transactionId Transaction ID.
    function executeTransaction(uint transactionId)
        public
        notExecuted(transactionId)
    {
        Transaction tx = transactions[transactionId];
        bool confirmed = isConfirmed(transactionId);
        if (confirmed || tx.data.length == 0 && isUnderLimit(tx.value)) {
            tx.executed = true;
            if (!confirmed)
                spentToday += tx.value;
            if (tx.destination.call.value(tx.value)(tx.data))
                Execution(transactionId);
            else {
                ExecutionFailure(transactionId);
                tx.executed = false;
                if (!confirmed)
                    spentToday -= tx.value;
            }
        }
    }

    /*
     * Internal functions
     */
    /// @dev Returns if amount is within daily limit and resets spentToday after one day.
    /// @param amount Amount to withdraw.
    /// @return Returns if amount is under daily limit.
    function isUnderLimit(uint amount)
        internal
        returns (bool)
    {
        if (now > lastDay + 24 hours) {
            lastDay = now;
            spentToday = 0;
        }
        if (spentToday + amount > dailyLimit || spentToday + amount < spentToday)
            return false;
        return true;
    }

    /*
     * Web3 call functions
     */
    /// @dev Returns maximum withdraw amount.
    /// @return Returns amount.
    function calcMaxWithdraw()
        public
        constant
        returns (uint)
    {
        if (now > lastDay + 24 hours)
            return dailyLimit;
        return dailyLimit - spentToday;
    }
}

pragma solidity ^0.4.13;

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

  function div(uint256 a, uint256 b) internal constant returns (uint256) {
    // assert(b > 0); // Solidity automatically throws when dividing by 0
    uint256 c = a / b;
    // assert(a == b * c + a % b); // There is no case in which this doesn't hold
    return c;
  }

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

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

contract Ownable {
  address public owner;


  /**
   * @dev The Ownable constructor sets the original `owner` of the contract to the sender
   * account.
   */
  function Ownable() {
    owner = msg.sender;
  }


  /**
   * @dev Throws if called by any account other than the owner.
   */
  modifier onlyOwner() {
    require(msg.sender == owner);
    _;
  }


  /**
   * @dev Allows the current owner to transfer control of the contract to a newOwner.
   * @param newOwner The address to transfer ownership to.
   */
  function transferOwnership(address newOwner) onlyOwner {
    if (newOwner != address(0)) {
      owner = newOwner;
    }
  }

}



contract ERC20Basic {
  uint256 public totalSupply;
  function balanceOf(address who) constant returns (uint256);
  function transfer(address to, uint256 value) returns (bool);
  
  // KYBER-NOTE! code changed to comply with ERC20 standard
  event Transfer(address indexed _from, address indexed _to, uint _value);
  //event Transfer(address indexed from, address indexed to, uint256 value);
}

contract BasicToken is ERC20Basic {
  using SafeMath for uint256;

  mapping(address => uint256) balances;

  /**
  * @dev transfer token for a specified address
  * @param _to The address to transfer to.
  * @param _value The amount to be transferred.
  */
  function transfer(address _to, uint256 _value) returns (bool) {
    balances[msg.sender] = balances[msg.sender].sub(_value);
    balances[_to] = balances[_to].add(_value);
    Transfer(msg.sender, _to, _value);
    return true;
  }

  /**
  * @dev Gets the balance of the specified address.
  * @param _owner The address to query the the balance of. 
  * @return An uint256 representing the amount owned by the passed address.
  */
  function balanceOf(address _owner) constant returns (uint256 balance) {
    return balances[_owner];
  }

}

contract ERC20 is ERC20Basic {
  function allowance(address owner, address spender) constant returns (uint256);
  function transferFrom(address from, address to, uint256 value) returns (bool);
  function approve(address spender, uint256 value) returns (bool);
  
  // KYBER-NOTE! code changed to comply with ERC20 standard
  event Approval(address indexed _owner, address indexed _spender, uint _value);
  //event Approval(address indexed owner, address indexed spender, uint256 value);
}

contract StandardToken is ERC20, BasicToken {

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


  /**
   * @dev Transfer tokens from one address to another
   * @param _from address The address which you want to send tokens from
   * @param _to address The address which you want to transfer to
   * @param _value uint256 the amout of tokens to be transfered
   */
  function transferFrom(address _from, address _to, uint256 _value) returns (bool) {
    var _allowance = allowed[_from][msg.sender];

    // Check is not needed because sub(_allowance, _value) will already throw if this condition is not met
    // require (_value <= _allowance);

    // KYBER-NOTE! code changed to comply with ERC20 standard
    balances[_from] = balances[_from].sub(_value);
    balances[_to] = balances[_to].add(_value);
    //balances[_from] = balances[_from].sub(_value); // this was removed
    allowed[_from][msg.sender] = _allowance.sub(_value);
    Transfer(_from, _to, _value);
    return true;
  }

  /**
   * @dev Aprove the passed address to spend the specified amount of tokens on behalf of msg.sender.
   * @param _spender The address which will spend the funds.
   * @param _value The amount of tokens to be spent.
   */
  function approve(address _spender, uint256 _value) returns (bool) {

    // To change the approve amount you first have to reduce the addresses`
    //  allowance to zero by calling `approve(_spender, 0)` if it is not
    //  already 0 to mitigate the race condition described here:
    //  https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
    require((_value == 0) || (allowed[msg.sender][_spender] == 0));

    allowed[msg.sender][_spender] = _value;
    Approval(msg.sender, _spender, _value);
    return true;
  }

  /**
   * @dev Function to check the amount of tokens that an owner allowed to a spender.
   * @param _owner address The address which owns the funds.
   * @param _spender address The address which will spend the funds.
   * @return A uint256 specifing the amount of tokens still avaible for the spender.
   */
  function allowance(address _owner, address _spender) constant returns (uint256 remaining) {
    return allowed[_owner][_spender];
  }

}

contract KyberNetworkCrystal is StandardToken, Ownable {
    string  public  constant name = "Kyber Network Crystal";
    string  public  constant symbol = "KNC";
    uint    public  constant decimals = 18;

    uint    public  saleStartTime;
    uint    public  saleEndTime;

    address public  tokenSaleContract;

    modifier onlyWhenTransferEnabled() {
        if( now <= saleEndTime && now >= saleStartTime ) {
            require( msg.sender == tokenSaleContract );
        }
        _;
    }

    modifier validDestination( address to ) {
        require(to != address(0x0));
        require(to != address(this) );
        _;
    }

    function KyberNetworkCrystal( uint tokenTotalAmount, uint startTime, uint endTime, address admin ) {
        // Mint all tokens. Then disable minting forever.
        balances[msg.sender] = tokenTotalAmount;
        totalSupply = tokenTotalAmount;
        Transfer(address(0x0), msg.sender, tokenTotalAmount);

        saleStartTime = startTime;
        saleEndTime = endTime;

        tokenSaleContract = msg.sender;
        transferOwnership(admin); // admin could drain tokens that were sent here by mistake
    }

    function transfer(address _to, uint _value)
        onlyWhenTransferEnabled
        validDestination(_to)
        returns (bool) {
        return super.transfer(_to, _value);
    }

    function transferFrom(address _from, address _to, uint _value)
        onlyWhenTransferEnabled
        validDestination(_to)
        returns (bool) {
        return super.transferFrom(_from, _to, _value);
    }

    event Burn(address indexed _burner, uint _value);

    function burn(uint _value) onlyWhenTransferEnabled
        returns (bool){
        balances[msg.sender] = balances[msg.sender].sub(_value);
        totalSupply = totalSupply.sub(_value);
        Burn(msg.sender, _value);
        Transfer(msg.sender, address(0x0), _value);
        return true;
    }

    // save some gas by making only one contract call
    function burnFrom(address _from, uint256 _value) onlyWhenTransferEnabled
        returns (bool) {
        assert( transferFrom( _from, msg.sender, _value ) );
        return burn(_value);
    }

    function emergencyERC20Drain( ERC20 token, uint amount ) onlyOwner {
        token.transfer( owner, amount );
    }
}

pragma solidity ^0.4.13;


/**
 * @title Ownable
 * @dev The Ownable contract has an owner address, and provides basic authorization control
 * functions, this simplifies the implementation of "user permissions".
 */
contract Ownable {
  address public owner;


  /**
   * @dev The Ownable constructor sets the original `owner` of the contract to the sender
   * account.
   */
  function Ownable() {
    owner = msg.sender;
  }


  /**
   * @dev Throws if called by any account other than the owner.
   */
  modifier onlyOwner() {
    require(msg.sender == owner);
    _;
  }


  /**
   * @dev Allows the current owner to transfer control of the contract to a newOwner.
   * @param newOwner The address to transfer ownership to.
   */
  function transferOwnership(address newOwner) onlyOwner {
    if (newOwner != address(0)) {
      owner = newOwner;
    }
  }

}

contract KyberContributorWhitelist is Ownable {
    // 7 wei is a dummy cap. Will be set by owner to a real cap after registration ends.
    uint public slackUsersCap = 7;
    mapping(address=>uint) public addressCap;

    function KyberContributorWhitelist() {}

    event ListAddress( address _user, uint _cap, uint _time );

    // Owner can delist by setting cap = 0.
    // Onwer can also change it at any time
    function listAddress( address _user, uint _cap ) onlyOwner {
        addressCap[_user] = _cap;
        ListAddress( _user, _cap, now );
    }

    // an optimasition in case of network congestion
    function listAddresses( address[] _users, uint[] _cap ) onlyOwner {
        require(_users.length == _cap.length );
        for( uint i = 0 ; i < _users.length ; i++ ) {
            listAddress( _users[i], _cap[i] );
        }
    }

    function setSlackUsersCap( uint _cap ) onlyOwner {
        slackUsersCap = _cap;
    }

    function getCap( address _user ) constant returns(uint) {
        uint cap = addressCap[_user];

        if( cap == 1 ) return slackUsersCap;
        else return cap;
    }

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