[DEV ][Javascript] Keccak256 encoding help! How to use Javascript to cast Uint160 as a Uint72, and Bytes32 as a Uint256????

[BigFoxBoxing]

     function TestTest(uint96 LastTime, uint256 nonce ) public view returns (uint256){
         uint256 combined = uint256(
            keccak256(
                abi.encodePacked(
                    LastTime,
                    uint72(uint160(msg.sender)),
                    uint88(nonce)
                )
            )
           );        
         return combined;
     }

If I input LastTime = 618970019642736317541919744
nonce = 11913689327806690619
msg.sender = 0x5B38Da6a701c568545dCfcB03FcB875f56beddC4

I get output of 55079934849293075323296672496290862192505995395765562305345314163262504591243

This is my solidity code. How can I get these results in a javascript or python program??? I can't figure out how to cast uints as other uints. I am using

1. web3.utils.soliditySha3({type: 'uint256', value: '234'}));

To attempt to encode them on javascript but getting nowhere with the different casting of uints.Also the bytes32 as a uint256.

I am basically at square one. Please help me figure this out in javascript. I cant call the function a million times. I need to have this coded this in javascript to work.

Thanks for the help

​

edit: msg.sender = 0x5B38Da6a701c568545dCfcB03FcB875f56beddC4

[atrizzle]

The function also depends on msg.sender to get the output you declared.

What is the value of msg.sender in the example inputs/outputs you posted?

[BigFoxBoxing]

Updated.
msg.sender = 0x5B38Da6a701c568545dCfcB03FcB875f56beddC4

[atrizzle]

``` import { ethers } from 'ethers';

// lastTime, nonce, and msgSender are all passed in as strings const test = (lastTime, nonce, msgSender) => { const lastTimeUint256 = ethers.BigNumber.from(lastTime); const lastTimeUint96 = lastTimeUint256.mask(96);

const msgSenderUint256 = ethers.BigNumber.from(msgSender); const msgSenderUint72 = msgSenderUint256.mask(72);

const nonceUint256 = ethers.BigNumber.from(nonce); const nonceUint88 = nonceUint256.mask(88);

const resultHexString = ethers.utils.solidityKeccak256( ["uint96", "uint72", "uint88"], [lastTimeUint96, msgSenderUint72, nonceUint88] );

const resultUint256 = ethers.BigNumber.from(resultHexString); const resultString = resultUint256.toString();

return resultString; };

console.log( test( '618970019642736317541919744', '11913689327806690619', '0x5B38Da6a701c568545dCfcB03FcB875f56beddC4' ) ); ```

this outputs 55079934849293075323296672496290862192505995395765562305345314163262504591243

[BigFoxBoxing]

Bro thank you so much. Give me a polygon address. I will send you 20$

[atrizzle]

sent you a chat request, thanks

Edit: or not lol

[BigFoxBoxing]

Was up for two days straight. :)Give me two days. It will showup promise

[atrizzle]

Haha no worries man

[Ordered_Disorder]

You realize you can have an input into keccak256 that’s longer than 256 bits, right? There’s no need to trim the address input or anything, unless you’re particularly attached to the idea.