Random

pragma solidity 0.6.2;

/*
    获取随机数
*/
contract Random{

    function getSalt() private view returns(uint256){
        return now + block.number + tx.origin.balance + uint160(tx.origin) + 113054462744175736859760933276506452880756369766118458860348233028355831172232;
    }

    function getRandom() public view returns(uint256) {
        uint256 a = getSalt();
        bytes memory s = uintToBytes(a);
        bytes32 b = sha256(bytes(s));
        string memory str = new string(b.length);
        bytes memory c = bytes(str);
        for(uint256 i=0;i<b.length;i++){
            c[i] = b[i];
        }
        return bytesToUint(c) % 10;
    }

    function uintToBytes(uint256 x) private pure returns (bytes memory c) {
        bytes32 b = bytes32(x);
        c = new bytes(32);
        for (uint i=0; i < 32; i++) {
            c[i] = b[i];
        }
    }
    function bytesToUint(bytes memory b) private pure returns (uint256){
        uint256 number;
        for(uint i= 0; i<b.length; i++){
            number = number + uint8(b[i])*(2**(8*(b.length-(i+1))));
        }
        return  number;
    }
}