Java SM4加密解密

依赖

    org.bouncycastle    bcprov-jdk15on    1.59

SM4工具类

public class Sm4Util {    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/ECB/PKCS5Padding";        public static String encryptEcb(String hexKey, String paramStr) throws Exception {        String cipherText = "";        // 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_Ecb_Padding(keyData, srcData);        // byte[]-->hexString        cipherText = ByteUtils.toHexString(cipherArray);        return cipherText;    }        public static byte[] encrypt_Ecb_Padding(byte[] key, byte[] data) throws Exception {        Cipher cipher = generateEcbCipher(ALGORITHM_NAME_ECB_PADDING, Cipher.ENCRYPT_MODE, key);//声称Ecb暗号,通过第二个参数判断加密还是解密        return cipher.doFinal(data);    }        private static Cipher generateEcbCipher(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);        return cipher;    }    //解密****************************************        public static String decryptEcb(String hexKey, String cipherText) throws Exception {        // 用于接收解密后的字符串        String decryptStr = "";        // hexString-->byte[]        byte[] keyData = ByteUtils.fromHexString(hexKey);        // hexString-->byte[]        byte[] cipherData = ByteUtils.fromHexString(cipherText);        // 解密        byte[] srcData = decrypt_Ecb_Padding(keyData, cipherData);        // byte[]-->String        decryptStr = new String(srcData, ENCODING);        return decryptStr;    }        public static byte[] decrypt_Ecb_Padding(byte[] key, byte[] cipherText) throws Exception {        Cipher cipher = generateEcbCipher(ALGORITHM_NAME_ECB_PADDING, Cipher.DECRYPT_MODE, key);//生成Ecb暗号,通过第二个参数判断加密还是解密        return cipher.doFinal(cipherText);    }        public static boolean verifyEcb(String hexKey, String cipherText, String paramStr) throws Exception {        // 用于接收校验结果        boolean flag = false;        // hexString-->byte[]        byte[] keyData = ByteUtils.fromHexString(hexKey);        // 将16进制字符串转换成数组        byte[] cipherData = ByteUtils.fromHexString(cipherText);        // 解密        byte[] decryptData = decrypt_Ecb_Padding(keyData, cipherData);        // 将原字符串转换成byte[]        byte[] srcData = paramStr.getBytes(ENCODING);        // 判断2个数组是否一致        flag = Arrays.equals(decryptData, srcData);        return flag;    }}

测试

public static void main(String[] args) {        try {            System.out.println("开始测试SM4加密解密====================");            String json = "{ keubgibzpcax: { dvwvgxsfcq: lvCAhMFcXoK9YB1B},dongubnfea: D9fpTrZOzByv}";            System.out.println("加密前：" + json);            //自定义的32位16进制秘钥            String key = "E99567ACC5364D69BA0B0BC83066955F";            //sm4加密            String cipher = Sm4Util.encryptEcb(key, json);            System.out.println("加密后：" + cipher);            //校验加密前后是否为同一数据            System.out.println("校验：" + Sm4Util.verifyEcb(key, cipher, json));            //解密            json = Sm4Util.decryptEcb(key, cipher);            System.out.println("解密后：" + json);            System.out.println("结束===================");        } catch (Exception e) {            e.printStackTrace();        }    }

来源地址：https://blog.csdn.net/weixin_50272584/article/details/130620339