Java implementa el cifrado doméstico SM3 y SM4

Dependencias de importación:

	<dependency>
         <groupId>org.bouncycastle</groupId>
         <artifactId>bcprov-jdk15on</artifactId>
         <version>1.54</version>
     </dependency>

Código completo:

package utils;

import org.bouncycastle.crypto.digests.SM3Digest;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.pqc.math.linearalgebra.ByteUtils;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.io.UnsupportedEncodingException;
import java.security.AlgorithmParameters;
import java.security.Key;
import java.security.SecureRandom;
import java.security.Security;
import java.util.Arrays;
import java.util.UUID;

/**
 * @description: SM4加密
 * @author: 张璞
 * @date 10:20 2022/9/13
 */
public class Sm4Util {
    
    
    static
    {
    
    
        Security.addProvider(new BouncyCastleProvider());
    }
    private static final String ENCODING = "UTF-8";
    public static final String ALGORITHM_NAME ="SM4";
    /**
     * 功能描述: 加密算法/分组加密模式/分组填充方式\PKCS5Padding-以8个字节为一组进行分组加密\定义分组加密模式使用：PKCS5Paddings
     */
    public static final String ALGORITHM_NAME_CBC_PADDING ="SM4/CBC/PKCS5Padding";
    /**
     * 功能描述: 128-32位16进制；256-64位16进制
     */
    public static final int DEFAULT_KEY_SIZE = 128;


    /**
     * 功能描述: 测试
     * @author zhang pu
     * @date 10:31 2022/9/13
     */
    public static void main(String[] args) throws Exception {
    
    
        String s = generateKeyString();
        System.out.println("密钥："+s);
        String uuid= UUID.randomUUID().toString();
        System.out.println("带加密数据："+uuid);
        //sm4对称加密
        String s1 = encryptTextSm4(s, uuid);
        System.out.println("加密数据："+s1);
        String s2 = decodeTextSm4(s, s1);
        System.out.println("解密数据："+s2);
        //sm3加密
        String s3 = encryptTextSm3(uuid);
        System.out.println(verify(uuid,s3));
    }

    /**
     * 功能描述: sm4加密 加密模式：CBC
     * 无线局域网标准的分组数据算法。对称加密，密钥长度和分组长度均为128位
     * @author zhang pu
     * @date 10:31 2022/9/13
     * @param hexKey   16进制密钥（忽略大小写）
     * @param paramStr 待加密字符串
     * 返回16进制的加密字符串
     */
    public static String encryptTextSm4(String hexKey, String paramStr) throws Exception {
    
    
        String result = "";
        // 16进制字符串-->byte[]
        byte[] keyData = ByteUtils.fromHexString(hexKey);
        // String-->byte[]
        byte[] srcData = paramStr.getBytes(ENCODING);
        // 加密后的数组
        byte[] cipherArray = encrypt_Cbc_Padding(keyData, srcData);
        // byte[]-->hexString
        result = ByteUtils.toHexString(cipherArray);
        return result;
    }

    /**
     * 功能描述: sm4解密 解密模式：采用CBC
     * @author zhang pu
     * @date 10:31 2022/9/13
     * @param hexKey 16进制密钥
     * @param text   16进制的加密字符串（忽略大小写）
     */
    public static String decodeTextSm4(String hexKey, String text) throws Exception {
    
    
        String result = "";
        byte[] keyData = ByteUtils.fromHexString(hexKey);
        byte[] resultData = ByteUtils.fromHexString(text);
        // 解密
        byte[] srcData = decrypt_Cbc_Padding(keyData, resultData);
        result = new String(srcData, ENCODING);
        return result;
    }

    /**
     * 功能描述: sm3加密
     * 消息摘要。可以用MD5作为对比理解。该算法已公开。校验结果为256位。
     * @author zhang pu
     * @date 10:39 2022/9/13
     * @param text  内容
     */
    public static String  encryptTextSm3(String text) throws UnsupportedEncodingException {
    
    
        byte[] bytes = text.getBytes(ENCODING);
        byte[] hash = hash(bytes);
        String s = ByteUtils.toHexString(hash);
        return s;
    }

    public static byte[] hash(byte[] srcData){
    
    
        SM3Digest digest=new SM3Digest();
        digest.update(srcData,0,srcData.length);
        byte[] bytes = new byte[digest.getDigestSize()];
        digest.doFinal(bytes,0);
        return bytes;
    }

    /**
     * 功能描述:判断元数据与加密数据是否一致
     * @author zhang pu
     * @date 10:56 2022/9/13
     * 参数 srcStr  元数据
     * 参数 sm3HexString 加密过的数据
     */
    public static boolean verify(String srcStr,String sm3HexString) throws Exception{
    
    
        boolean flag=false;
        byte[] srcStrData = srcStr.getBytes(ENCODING);
        byte[] sm3HexStringData = ByteUtils.fromHexString(sm3HexString);
        byte[] hash = hash(srcStrData);
        if(Arrays.equals(hash,sm3HexStringData))
        {
    
    
            flag= true;
        }
        return flag;
    }

    /**
     * 功能描述: 生成密钥
     * @author zhang pu
     * @date 10:30 2022/9/13
     */
    public static String generateKeyString() throws Exception {
    
    
        KeyGenerator kg = KeyGenerator.getInstance(ALGORITHM_NAME, BouncyCastleProvider.PROVIDER_NAME);
        kg.init(DEFAULT_KEY_SIZE, new SecureRandom());
        byte[] encoded = kg.generateKey().getEncoded();
        return ByteUtils.toHexString(encoded);
    }

    /**
     * 加密模式之CBC
     * @param key
     * @param data
     * @return
     * @throws Exception
     * @explain
     */
    public static byte[] encrypt_Cbc_Padding(byte[] key, byte[] data) throws Exception {
    
    
        Cipher cipher = generateCbcCipher(ALGORITHM_NAME_CBC_PADDING, Cipher.ENCRYPT_MODE, key);
        return cipher.doFinal(data);
    }

    private static Cipher generateCbcCipher(String algorithmName, int mode, byte[] key) throws Exception {
    
    
        Cipher cipher = Cipher.getInstance(algorithmName, BouncyCastleProvider.PROVIDER_NAME);
        Key sm4Key = new SecretKeySpec(key, ALGORITHM_NAME);
        cipher.init(mode, sm4Key, generateIV());
        return cipher;
    }

    /**
     * 功能描述: 初始化算法参数
     * @author zhang pu
     * @date 10:33 2022/9/13
     */
    public static AlgorithmParameters generateIV() throws Exception {
    
    
        byte[] iv = new byte[16];
        //设置数据全为0
        Arrays.fill(iv, (byte) 0x00);
        AlgorithmParameters params = AlgorithmParameters.getInstance(ALGORITHM_NAME);
        params.init(new IvParameterSpec(iv));
        return params;
    }

    /**
     * 功能描述: cbc模式解密
     * @author zhang pu
     * @date 10:33 2022/9/13
     */
    public static byte[] decrypt_Cbc_Padding(byte[] key, byte[] cipherText) throws Exception {
    
    
        Cipher cipher = generateCbcCipher(ALGORITHM_NAME_CBC_PADDING, Cipher.DECRYPT_MODE, key);
        return cipher.doFinal(cipherText);
    }
}