ModExp sample on Solidity

ModExp.sol

pragma solidity ^0.8.1;


contract ModExpContracts {
    address public constant modExpAddress = 0x0000000000000000000000000000000000000005;
    
    bytes public _result;
    
    function modExp(
        uint baseLength,
        uint expLength,
        uint modLength,
        bytes calldata _base,
        bytes calldata exp,
        bytes calldata modulus)
        public
        {
            
            (bool _success, bytes memory result) = modExpAddress.call(
                abi.encodePacked(baseLength, expLength, modLength, _base, exp, modulus));
            _result = result;
    }
}