SM4 hutool工具类版本及非工具类版本

一、hutool工具类版本

1、jar包

		<dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-all</artifactId>
            <version>5.8.11</version>
        </dependency>
        <dependency>
            <groupId>org.bouncycastle</groupId>
            <artifactId>bcprov-jdk15on</artifactId>
            <version>1.70</version>
        </dependency>

2、代码

public class SM4Utils {

    public static final String SM4K = "ac02f39ca33fe4a4eab8b61dfa4e81d7";

    /**
     * 获取sm4秘钥
     *
     * @return sm4秘钥
     */
    public static String getSm4Key() {
        SM4 sm4 = SmUtil.sm4();
        SecretKey secretKey = sm4.getSecretKey();
        byte[] encoded = secretKey.getEncoded();
        return HexUtil.encodeHexStr(encoded);
    }

    /**
     * sm4加密
     *
     * @param content 文本
     * @return 加密后的结果
     */
    public static String encrypt(String content) {
        if (StringUtils.isBlank(content)) {
            return null;
        }
        SM4 sm4 = new SM4(HexUtil.decodeHex(SM4K));
        return sm4.encryptHex(content);
    }

    /**
     * @param content
     * @return 解密后的结果
     */
    public static String decrypt(String content) {
        if (StringUtils.isBlank(content)) {
            return null;
        }
        SM4 sm4 = new SM4(HexUtil.decodeHex(SM4K));
        return sm4.decryptStr(content);
    }

    public static void main(String[] args) {
        // 获取秘钥
        String sm4Key = getSm4Key();
        System.out.println("sm4秘钥:" + sm4Key);

        // 加密
        String encrypt = encrypt("afafsgargra");
        System.out.println("加密后：" + encrypt);

        // 解密
        String decrypt = decrypt(encrypt);
        System.out.println("解密后：" + decrypt);

    }

}

3、运行结果

二、非工具类版本

1、jar包

        <dependency>
            <groupId>org.bouncycastle</groupId>
            <artifactId>bcprov-jdk15on</artifactId>
            <version>1.70</version>
        </dependency>

2、代码

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";
    // 128-32位16进制；256-64位16进制
    public static final int DEFAULT_KEY_SIZE = 128;

    /**
     * 生成ECB暗号
     * @explain ECB模式（电子密码本模式：Electronic codebook）
     * @param algorithmName
     *            算法名称
     * @param mode
     *            模式
     * @param key
     * @return
     * @throws Exception
     */
    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;
    }

    /**
     * 自动生成密钥
     * @explain
     * @return
     * @throws NoSuchAlgorithmException
     * @throws NoSuchProviderException
     */
    public static byte[] generateKey() throws Exception {
        return generateKey(DEFAULT_KEY_SIZE);
    }

    /**
     * @explain
     * @param keySize
     * @return
     * @throws Exception
     */
    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();
    }

    /**
     * sm4加密
     * @explain 加密模式：ECB
     *          密文长度不固定，会随着被加密字符串长度的变化而变化
     * @param hexKey
     *            16进制密钥（忽略大小写）
     * @param paramStr
     *            待加密字符串
     * @return 返回16进制的加密字符串
     * @throws Exception
     */
    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 String encryptEcbToBase64(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 = Base64.encodeBase64String(cipherArray);
        return cipherText;
    }


    /**
     * 加密模式之Ecb
     * @explain
     * @param key
     * @param data
     * @return
     * @throws Exception
     */
    public static byte[] encrypt_Ecb_Padding(byte[] key, byte[] data) throws Exception {
        Cipher cipher = generateEcbCipher(ALGORITHM_NAME_ECB_PADDING, Cipher.ENCRYPT_MODE, key);
        return cipher.doFinal(data);
    }

    /**
     * sm4解密
     * @explain 解密模式：采用ECB
     * @param hexKey
     *            16进制密钥
     * @param cipherText
     *            16进制的加密字符串（忽略大小写）
     * @return 解密后的字符串
     * @throws Exception
     */
    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 String decryptEcb(byte[] key,byte[] encryptedData) throws Exception {
        // 用于接收解密后的字符串
        String decryptStr = "";
        // 解密
        byte[] srcData = decrypt_Ecb_Padding(key, encryptedData);
        // byte[]-->String
        decryptStr = new String(srcData, ENCODING);
        return decryptStr;
    }

    /**
     * 解密
     * @explain
     * @param key
     * @param cipherText
     * @return
     * @throws Exception
     */
    public static byte[] decrypt_Ecb_Padding(byte[] key, byte[] cipherText) throws Exception {
        Cipher cipher = generateEcbCipher(ALGORITHM_NAME_ECB_PADDING, Cipher.DECRYPT_MODE, key);
        return cipher.doFinal(cipherText);
    }

    /**
     * 校验加密前后的字符串是否为同一数据
     * @explain
     * @param hexKey
     *            16进制密钥（忽略大小写）
     * @param cipherText
     *            16进制加密后的字符串
     * @param paramStr
     *            加密前的字符串
     * @return 是否为同一数据
     * @throws Exception
     */
    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;
    }

    public static void main(String[] args) {
        try {
            String json = "13800138000";
            // 自定义的32位16进制密钥
            String key = "86C63180C2806ED1F47B859DE501215B";
            String cipher = SM4Util.encryptEcb(key, json);
            System.out.println(cipher);
            System.out.println(SM4Util.verifyEcb(key, cipher, json));// true
            json = SM4Util.decryptEcb(key, cipher);
            System.out.println(json);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

3、运行结果