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";

    /**
     * sm4加密
     *
     * @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
     * @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
     */
    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;
    }

    /**
     * 加密模式之Ecb
     *
     * @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);//声称Ecb暗号,通过第二个参数判断加密还是解密
        return cipher.doFinal(data);
    }

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

    /**
     * sm4解密
     *
     * @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
     * @explain 解密模式:采用ECB
     */
    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;
    }

    /**
     * 解密
     *
     * @param key
     * @param cipherText
     * @return
     * @throws Exception
     * @explain
     */
    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);
    }

    /**
     * 校验加密前后的字符串是否为同一数据
     *
     * @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
     * @explain
     */
    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();
        }
    }

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