Md5Utils

Md5Utils1.java

import org.apache.commons.codec.binary.Hex;

import java.security.MessageDigest;
import java.util.Random;

public class Md5Utils {

    /**
     * 加盐MD5加密
     * <p>
     *
     * @Title : getSaltMD5
     * </p>
     * <p>
     * @Description : TODO
     * </p>
     */
    public static String getSaltMD5(String password) {
        // 生成一个16位的随机数
        Random random = new Random();
        StringBuilder sBuilder = new StringBuilder(16);
        sBuilder.append(random.nextInt(99999999)).append(random.nextInt(99999999));
        int len = sBuilder.length();
        if (len < 16) {
            for (int i = 0; i < 16 - len; i++) {
                sBuilder.append("0");
            }
        }
        // 生成最终的加密盐
        String Salt = sBuilder.toString();
        password = md5Hex(password + Salt);
        char[] cs = new char[48];
        for (int i = 0; i < 48; i += 3) {
            cs[i] = password.charAt(i / 3 * 2);
            char c = Salt.charAt(i / 3);
            cs[i + 1] = c;
            cs[i + 2] = password.charAt(i / 3 * 2 + 1);
        }
        return String.valueOf(cs);
    }

    /**
     * 使用Apache的Hex类实现Hex(16进制字符串和)和字节数组的互转
     * <p>
     *
     * @Title : md5Hex
     * </p>
     * <p>
     * @Description : TODO
     * </p>
     */
//    @SuppressWarnings("unused")
    private static String md5Hex(String str) {
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            byte[] digest = md.digest(str.getBytes());
            return new String(new Hex().encode(digest));
        } catch (Exception e) {
            e.printStackTrace();
            System.out.println(e.toString());
            return "";
        }
    }


    /**
     * 验证加盐后密码是否还相同
     * @param password
     * @param md5str
     * @return
     */
    public static boolean getSaltverifyMD5(String password, String md5str) {
        char[] cs1 = new char[32];
        char[] cs2 = new char[16];
        for (int i = 0; i < 48; i += 3) {
            cs1[i / 3 * 2] = md5str.charAt(i);
            cs1[i / 3 * 2 + 1] = md5str.charAt(i + 2);
            cs2[i / 3] = md5str.charAt(i + 1);
        }
        String Salt = new String(cs2);
        return md5Hex(password + Salt).equals(String.valueOf(cs1));
    }

}

Md5Utils2.java

import lombok.extern.slf4j.Slf4j;
import org.apache.commons.codec.binary.Hex;
import org.junit.runner.RunWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Random;

//@Slf4j
//@RunWith(SpringRunner.class)
//@SpringBootTest
public class DemoApplicationTests {
	public static String MD5(String input) {
		MessageDigest md5 = null;
		try {
			md5 = MessageDigest.getInstance("MD5");
		} catch (NoSuchAlgorithmException e) {
			return "check jdk";
		} catch (Exception e) {
			e.printStackTrace();
			return "";
		}
		char[] charArray = input.toCharArray();
		byte[] byteArray = new byte[charArray.length];

		for (int i = 0; i < charArray.length; i++)
			byteArray[i] = (byte) charArray[i];
		byte[] md5Bytes = md5.digest(byteArray);
		StringBuffer hexValue = new StringBuffer();
		for (int i = 0; i < md5Bytes.length; i++) {
			int val = ((int) md5Bytes[i]) & 0xff;
			if (val < 16)
				hexValue.append("0");
			hexValue.append(Integer.toHexString(val));
		}
		return hexValue.toString();
	}

	public static String generate(String password) {
		Random r = new Random();
		StringBuilder sb = new StringBuilder(16);
		sb.append(r.nextInt(99999999)).append(r.nextInt(99999999));
		int len = sb.length();
		if (len < 16) {
			for (int i = 0; i < 16 - len; i++) {
				sb.append("0");
			}
		}
		String salt = sb.toString();
		password = md5Hex(password + salt);
		char[] cs = new char[48];
		for (int i = 0; i < 48; i += 3) {
			cs[i] = password.charAt(i / 3 * 2);
			char c = salt.charAt(i / 3);
			cs[i + 1] = c;
			cs[i + 2] = password.charAt(i / 3 * 2 + 1);
		}
		return new String(cs);
	}

	public static boolean verify(String password, String md5) {
		char[] cs1 = new char[32];
		char[] cs2 = new char[16];
		for (int i = 0; i < 48; i += 3) {
			cs1[i / 3 * 2] = md5.charAt(i);
			cs1[i / 3 * 2 + 1] = md5.charAt(i + 2);
			cs2[i / 3] = md5.charAt(i + 1);
		}
		String salt = new String(cs2);
		return md5Hex(password + salt).equals(new String(cs1));
	}

	private static String md5Hex(String src) {
		try {
			MessageDigest md5 = MessageDigest.getInstance("MD5");
			byte[] bs = md5.digest(src.getBytes());
			return new String(new Hex().encode(bs));
		} catch (Exception e) {
			return null;
		}
	}

	public static void main(String args[]) {

		String plaintext = "LeoXin";

		System.out.println("明文：" + plaintext);
		System.out.println("普通MD5码：" + MD5(plaintext));

		// 获取加盐后的MD5值
		String ciphertext = generate(plaintext);
		System.out.println("加盐后MD5码：" + ciphertext);
		System.out.println("是否是同一字符串:" + verify(plaintext, ciphertext));

	}

}