SM3是签名算法，和MD5一样（对于应用层来说）。

SM4是对称加密算法，和AES一样（对于应用层来说）。

这里还有1点要注意的SM4，的密钥是128位，也就是16个字节。

程序运行截图如下：

D:\java8\content\bin\java.exe -javaagent:D:\idea\content\lib\idea_rt.jar=62511:D:\idea\content\bin -Dfile.encoding=UTF-8 -classpath D:\java8\content\jre\lib\charsets.jar;D:\java8\content\jre\lib\deploy.jar;D:\java8\content\jre\lib\ext\access-bridge-64.jar;D:\java8\content\jre\lib\ext\cldrdata.jar;D:\java8\content\jre\lib\ext\dnsns.jar;D:\java8\content\jre\lib\ext\jaccess.jar;D:\java8\content\jre\lib\ext\jfxrt.jar;D:\java8\content\jre\lib\ext\localedata.jar;D:\java8\content\jre\lib\ext\nashorn.jar;D:\java8\content\jre\lib\ext\sunec.jar;D:\java8\content\jre\lib\ext\sunjce_provider.jar;D:\java8\content\jre\lib\ext\sunmscapi.jar;D:\java8\content\jre\lib\ext\sunpkcs11.jar;D:\java8\content\jre\lib\ext\zipfs.jar;D:\java8\content\jre\lib\javaws.jar;D:\java8\content\jre\lib\jce.jar;D:\java8\content\jre\lib\jfr.jar;D:\java8\content\jre\lib\jfxswt.jar;D:\java8\content\jre\lib\jsse.jar;D:\java8\content\jre\lib\management-agent.jar;D:\java8\content\jre\lib\plugin.jar;D:\java8\content\jre\lib\resources.jar;D:\java8\content\jre\lib\rt.jar;D:\IDEAProject\SM3&SM4\target\classes;D:\newGenRepository\repository\cn\hutool\hutool-all\5.7.6\hutool-all-5.7.6.jar;D:\newGenRepository\repository\org\bouncycastle\bcprov-jdk15to18\1.68\bcprov-jdk15to18-1.68.jar cn.it1995.Main
sm3:44526eeba9235bae33f2bab8ff1f9ca8965b59d58be82af8111f336a00c1c432
--------------------华丽的分割线--------------------
加密:3863d3f134bde1e2c4230dfc31296387
decryptStr:HelloWorld
--------------------华丽的分割线--------------------
encryptString:11d61070968d7cd5755ab59733e78770
decryptString:HelloWorld

Process finished with exit code 0

源码如下：

Main.java

package cn.it1995;

import cn.hutool.core.util.CharsetUtil;
import cn.hutool.crypto.SmUtil;
import cn.hutool.crypto.symmetric.SM4;
import cn.hutool.crypto.symmetric.SymmetricCrypto;

public class Main {

    static String txt = "HelloWorld";

    public static void test1(){

        String sm3 = SmUtil.sm3(txt);
        System.out.println("sm3:" + sm3);
    }

    public static void test2(){

        SymmetricCrypto sm4 = SmUtil.sm4();
        String encryptHex = sm4.encryptHex(txt);
        System.out.println("加密:" + encryptHex);

        String decryptStr = sm4.decryptStr(encryptHex, CharsetUtil.CHARSET_UTF_8);
        System.out.println("decryptStr:" + decryptStr);

    }

    public static void test3(){

        //密钥长度为128位
        SM4 sm4 = SmUtil.sm4("1234567891234567".getBytes());
        String encryptString = sm4.encryptHex(txt);
        System.out.println("encryptString:" + encryptString);
        String decryptString = sm4.decryptStr(encryptString, CharsetUtil.CHARSET_UTF_8);
        System.out.println("decryptString:" + decryptString);
    }

    public static void main(String[] args) {

        test1();
        System.out.println("--------------------华丽的分割线--------------------");
        test2();
        System.out.println("--------------------华丽的分割线--------------------");
        test3();
    }
}

prm.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>cn.it1995</groupId>
    <artifactId>SM3AndSM4</artifactId>
    <version>1.0-SNAPSHOT</version>

    <dependencies>

        <dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-all</artifactId>
            <version>5.7.6</version>
        </dependency>

        <dependency>
            <groupId>org.bouncycastle</groupId>
            <artifactId>bcprov-jdk15to18</artifactId>
            <version>1.68</version>
        </dependency>

    </dependencies>


</project>

源码打包下载地址：

https://github.com/fengfanchen/Java/tree/master/SM3%26SM4