SM4 SM4/CBC/PKCS5Padding

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已于 2025-02-05 17:43:27 修改

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分类专栏： java 文章标签： java 蓝桥杯开发语言

于 2022-03-10 16:12:02 首次发布

本文链接：https://blog.youkuaiyun.com/zhglhy/article/details/123404301

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public class Sm4_Cbc {


    static {
        Security.addProvider(new BouncyCastleProvider());
    }

    private static final String ENCODING = "UTF-8";
    public static final String ALGORITHM_NAME = "SM4";
    // 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：PKCS5Padding
    public static final String ALGORITHM_NAME_ECB_PADDING = "SM4/CBC/PKCS5Padding";
    // 128-32位16进制；256-64位16进制
    public static final int DEFAULT_KEY_SIZE = 128;


    /**
     * 自动生成密钥
     *
     * @return
     * @explain
     */
    public static String generateKey() throws Exception {
        return new String(Hex.encodeHex(generateKey(DEFAULT_KEY_SIZE),false));
    }

    /**
     * @param keySize
     * @return
     * @throws Exception
     * @explain
     */
    public static byte[] generateKey(int keySize) throws Exception {
        KeyGenerator kg = KeyGenerator.getInstance(ALGORITHM_NAME, BouncyCastleProvider.PROVIDER_NAME);
        kg.init(keySize, new SecureRandom());
        return kg.generateKey().getEncoded();
    }


    private static Cipher generateCipher(String algorithmName, int mode, byte[] key) throws Exception {
        Cipher cipher = Cipher.getInstance(algorithm

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