package com.example.utils;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class Md5Util {

    public static String encrypt(String input) {
        if (input == null || input.isEmpty()) {
            return null;
        }
        try {
            MessageDigest md = MessageDigest.getInstance("SHA-1");
            byte[] digest = md.digest(input.getBytes());
            StringBuilder sb = new StringBuilder();
            for (byte b : digest) {
                sb.append(String.format("%02x", b));
            }
            return sb.toString();
        } catch (NoSuchAlgorithmException e) {
            throw new RuntimeException("加密失败", e);
        }
    }
}