https://doc.hutool.cn/pages/SmUtil/


Hutool针对Bouncy Castle做了简化包装，用于实现国密算法中的SM2、SM3、SM4。

国密算法工具封装包括：

非对称加密和签名：SM2
摘要签名算法：SM3
对称加密：SM4
国密算法需要引入Bouncy Castle库的依赖。


org.bouncycastle:bcprov-jdk18on:1.74




        // 使用随机生成的密钥
        String text = "hello,你好";
        byte[] dataBytes = text.getBytes(StandardCharsets.UTF_8);

        SM2 sm2 = SmUtil.sm2();
        // 公钥加密，私钥解密
        byte[] encryptBytes = sm2.encrypt(dataBytes, KeyType.PublicKey);
        byte[] decryptBytes = sm2.decrypt(encryptBytes,KeyType.PrivateKey);
        String decryptStr = StrUtil.utf8Str(decryptBytes);
        System.out.println(decryptStr);

        KeyPair pair = SecureUtil.generateKeyPair("SM2");
        byte[] privateKey = pair.getPrivate().getEncoded();
        byte[] publicKey = pair.getPublic().getEncoded();

        sm2 = SmUtil.sm2(privateKey, publicKey);

        encryptBytes = sm2.encrypt(dataBytes);
        decryptBytes = sm2.decrypt(encryptBytes);
        decryptStr = StrUtil.utf8Str(decryptBytes);
        System.out.println(decryptStr);

        byte[]  signBytes = sm2.sign(dataBytes);
        boolean verify = sm2.verify(dataBytes, signBytes);
        System.out.println("verify="+verify);

        // 摘要算法SM3
        String digestHex = SmUtil.sm3(text);
        System.out.println("sm3.digestHex="+digestHex);


        // 对称加密SM4

        // 使用生成的随机密钥
        SymmetricCrypto sm4 = SmUtil.sm4();
        String encryptHex = sm4.encryptHex(text);
        decryptStr = sm4.decryptStr(encryptHex, CharsetUtil.CHARSET_UTF_8);
        System.out.println("sm4.decryptStr="+decryptStr);

        // 使用自定义密钥
        byte[] key = KeyUtil.generateKey(SM4.ALGORITHM_NAME, 128).getEncoded();
        sm4 = SmUtil.sm4(key);

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





https://gitee.com/dyyx/work2024/blob/master/demo/hutooldemo/src/main/java/crypto/SmUtilDemo.java