Java之SM4解密与解密

在线加密工具链接 

在线SM4国密加密/解密—LZL在线工具在线SM4国密加密/解密https://lzltool.cn/SM4

根据项目选择相应数据格式 

pom.xml引入一下jar包

<dependency>
    <groupId>cn.hutool</groupId>
    <artifactId>hutool-all</artifactId>
    <version>5.8.7</version>
</dependency>

<dependency>
    <groupId>org.bouncycastle</groupId>
    <artifactId>bcpkix-jdk15on</artifactId>
    <version>1.70</version>
</dependency>

实现SM4加密和解密代码部分

import cn.hutool.core.util.CharsetUtil;
import cn.hutool.crypto.Mode;
import cn.hutool.crypto.Padding;
import cn.hutool.crypto.symmetric.SM4;
import java.io.IOException;

public class Sm4Utils {
    public Sm4Utils() {
    }

    //加密为16进制，也可以加密成base64/字节数组
    public static String encryptSm4(String plaintext, String key, String iv) {
        SM4 sm4 = new SM4(Mode.CBC, Padding.PKCS5Padding, key.getBytes(), iv.getBytes());
        return sm4.encryptBase64(plaintext);
    }

    //解密
    public static String decryptSm4(String ciphertext, String key,String iv) {
        SM4 sm4 = new SM4(Mode.CBC, Padding.PKCS5Padding, key.getBytes(), iv.getBytes());
        return sm4.decryptStr(ciphertext, CharsetUtil.CHARSET_UTF_8);
    }


    public static void main(String[] args) throws IOException {
        String plainText = "文字内容";
        Sm4Utils sm4 = new Sm4Utils();
        String key = "输入key值";
        String iv  = "输入iv值";
        System.out.println("CBC模式加密");
        String cipherText = sm4.encryptSm4(plainText, key,iv);
        System.out.println("密文: " + cipherText);
        System.out.println();


        System.out.println("CBC模式解密");
        String iv1= "iv值";
        String data= "RddoC3+TFYWB+JgxfYkBxQ6GH/iMVpgCtGMpPkZ5yCcHrK5/IS68EUWaRKQ7PBbTxy4A60SBQETlKO3jQrPvAPDShrpihOMpjIxFfobr+8rA0qoEBE5oD+SXZv4iDSANFjEMguinl1DEc0Xj9LjJ2g==";
        String plainText1 = sm4.decryptSm4(data, key,iv1);
        System.out.println("明文: " + plainText1);
        System.out.println();//
    }

}