java使用SM4使用ECB模式加密

以下是Java使用SM4算法ECB模式加密的示例代码：

import org.bouncycastle.jce.provider.BouncyCastleProvider;
import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
import java.security.Security;
import java.util.Base64;

public class SM4Util {
    private static final String ALGORITHM_NAME = "SM4";
    private static final String ALGORITHM_NAME_ECB_PADDING = "SM4/ECB/PKCS7Padding";

    /**
     * SM4加密
     *
     * @param key 16位秘钥
     * @param data 待加密数据
     * @return 加密结果
     * @throws Exception
     */
    public static String encryptData_ECB(String key, String data) throws Exception {
        Security.addProvider(new BouncyCastleProvider());
        Cipher cipher = Cipher.getInstance(ALGORITHM_NAME_ECB_PADDING, "BC");
        SecretKeySpec secretKeySpec = new SecretKeySpec(key.getBytes(), ALGORITHM_NAME);
        cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec);
        byte[] encrypted = cipher.doFinal(data.getBytes("UTF-8"));
        return Base64.getEncoder().encodeToString(encrypted);
    }

    /**
     * SM4解密
     *
     * @param key 16位秘钥
     * @param cipherText 待解密数据
     * @return 解密结果
     * @throws Exception
     */
    public static String decryptData_ECB(String key, String cipherText) throws Exception {
        Security.addProvider(new BouncyCastleProvider());
        Cipher cipher = Cipher.getInstance(ALGORITHM_NAME_ECB_PADDING, "BC");
        SecretKeySpec secretKeySpec = new SecretKeySpec(key.getBytes(), ALGORITHM_NAME);
        cipher.init(Cipher.DECRYPT_MODE, secretKeySpec);
        byte[] decrypted = cipher.doFinal(Base64.getDecoder().decode(cipherText));
        return new String(decrypted, "UTF-8");
    }
}

使用示例：

public class Test {
    public static void main(String[] args) throws Exception {
        String key = "1234567890abcdef";
        String data = "hello world";
        String encryptedData = SM4Util.encryptData_ECB(key, data);
        System.out.println("加密后的数据：" + encryptedData);        String decryptedData = SM4Util.decryptData_ECB(key, encryptedData);
        System.out.println("解密后的数据：" + decryptedData);
    }
}