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/**
 *Submitted for verification at Etherscan.io on 2018-10-01
*/

pragma solidity 0.4.25;

/**
 * @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;

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

    /**
     * @dev The Ownable constructor sets the original `owner` of the contract to the sender
     * account.
     */
    constructor() public {
        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) public onlyOwner {
        require(newOwner != address(0));
        emit OwnershipTransferred(owner, newOwner);
        owner = newOwner;
    }
}

/**
 * @title Authorizable
 * @dev The Authorizable contract has authorized addresses, and provides basic authorization control
 * functions, this simplifies the implementation of "multiple user permissions".
 */
contract Authorizable is Ownable {
    
    mapping(address => bool) public authorized;
    event AuthorizationSet(address indexed addressAuthorized, bool indexed authorization);

    /**
     * @dev The Authorizable constructor sets the first `authorized` of the contract to the sender
     * account.
     */
    constructor() public {
        authorize(msg.sender);
    }

    /**
     * @dev Throws if called by any account other than the authorized.
     */
    modifier onlyAuthorized() {
        require(authorized[msg.sender]);
        _;
    }

    /**
     * @dev Allows 
     * @param _address The address to change authorization.
     */
    function authorize(address _address) public onlyOwner {
        require(!authorized[_address]);
        emit AuthorizationSet(_address, true);
        authorized[_address] = true;
    }
    /**
     * @dev Disallows
     * @param _address The address to change authorization.
     */
    function deauthorize(address _address) public onlyOwner {
        require(authorized[_address]);
        emit AuthorizationSet(_address, false);
        authorized[_address] = false;
    }
}

contract ZmineRandom is Authorizable {
    
    uint256 public counter = 0;
    mapping(uint256 => uint256) public randomResultMap;
    mapping(uint256 => uint256[]) public randomInputMap;
    
 
    function random(uint256 min, uint256 max, uint256 lotto) public onlyAuthorized  {
        
		require(min > 0);
        require(max > min);
         
        counter++;
        uint256 result = ((uint256(keccak256(abi.encodePacked(lotto))) 
                        + uint256(keccak256(abi.encodePacked(counter))) 
                        + uint256(keccak256(abi.encodePacked(block.difficulty)))
                        + uint256(keccak256(abi.encodePacked(block.number - 1)))
                    ) % (max-min+1)) - min;
        
        uint256[] memory array = new uint256[](5);
        array[0] = min;
        array[1] = max;
        array[2] = lotto;
        array[3] = block.difficulty;
        array[4] = block.number;
        randomInputMap[counter] = array;
         
        randomResultMap[counter] = result;
    }

    function checkHash(uint256 n) public pure returns (uint256){
        return uint256(keccak256(abi.encodePacked(n)));
    }
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"constant":false,"inputs":[{"name":"_address","type":"address"}],"name":"deauthorize","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"n","type":"uint256"}],"name":"checkHash","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"pure","type":"function"},{"constant":true,"inputs":[],"name":"counter","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"min","type":"uint256"},{"name":"max","type":"uint256"},{"name":"lotto","type":"uint256"}],"name":"random","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"owner","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_address","type":"address"}],"name":"authorize","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"","type":"uint256"}],"name":"randomResultMap","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"","type":"address"}],"name":"authorized","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"","type":"uint256"},{"name":"","type":"uint256"}],"name":"randomInputMap","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"anonymous":false,"inputs":[{"indexed":true,"name":"addressAuthorized","type":"address"},{"indexed":true,"name":"authorization","type":"bool"}],"name":"AuthorizationSet","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"previousOwner","type":"address"},{"indexed":true,"name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"}]

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