45-Solidity8.0-哈希运算

源码：

pragma solidity ^0.8.7;

contract HashFunc {
    function hash(string memory text, uint num, address addr) external pure returns (bytes32) {
        return keccak256(abi.encodePacked(text, num, addr));
    }

    function encode(string memory text0, string memory text1) external pure returns (bytes memory) {
        return abi.encode(text0, text1);
    }

    function encodePacked(string memory text0, string memory text1) external pure returns (bytes memory) {
        return abi.encodePacked(text0, text1);
    }

    function collision(string memory text0, uint x, string memory text1) external pure returns (bytes32) {
        return keccak256(abi.encodePacked(text0, x, text1));
    }
}