Java MD5算法的原理及实现方法是什么

MD5(Message-Digest Algorithm 5)????????????,???????????(digest)????????????128???????,???32??????

MD5?????????:

1. ??????????512?(64???)????????
2. ???????????????????,??????????????,???????????????
3. ???????64?????,?????????????,?????????????
4. ?????????????MD5???

Java?????java.security.MessageDigest????MD5???????????Java????:

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

public class MD5Example {

    public static void main(String[] args) {
        String input = "Hello, MD5!";
        
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            md.update(input.getBytes());
            byte[] digest = md.digest();
            
            StringBuilder sb = new StringBuilder();
            for (byte b : digest) {
                sb.append(String.format("x", b & 0xff));
            }
            
            System.out.println("MD5 hash: " + sb.toString());
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
    }
}

??????,????????MD5??????,MD5???????????,????????,????????????,?SHA-256??