How to Random Number Generator in Solidity using keccak256

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Random Number Generator in Solidity using keccak256

The random numbers are numbers that occur in sequence, Here we will cover this with the following two mandatory conditions:

• Anyone cann’t predict future values based on past outputs
• The values distribute after every miny second

So, let’s go and see the code below and if you want to create your own random number then follow below example:

First of all Convert that hash to an uint, and then use % 100 if you want to take only the last 2 digits. This will give us a totally random number between 0 and 99.

For Example:

// Solidity program to
// demonstrate on how
// to generate a random number
pragma solidity ^0.6.6;
 
// Creating a contract
contract WholeblogsRandom
{
 
// Initializing the state variable
uint randNonce = 0;
 
// Defining a function to generate
// a random number
function randMod(uint _modulus) internal returns(uint)
{
   // increase nonce
   randNonce++; 
   return uint(keccak256(abi.encodePacked(now,
                                          msg.sender,
                                          randNonce))) % _
                                          modulus;
 }
}

Read More: Use msg.sender in Solidity Code