rain
2024-08-12 dbecdea3ad1768d1c7f8e88a2d3b64193c62352a
src/main/java/com/dji/sample/droneairport/utils/SM4Util.java
@@ -6,52 +6,158 @@
import org.bouncycastle.crypto.paddings.PKCS7Padding;
import java.nio.charset.StandardCharsets;
import java.security.SecureRandom;
import java.util.Arrays;
import java.util.Base64;
public class SM4Util {
    /**
     * 生成一个随机的SM4加密密钥。
     *
     * SM4算法是一种对称加密算法,其密钥长度为128位(16字节)。
     * 本方法使用安全随机数生成器生成一个16字节的随机值作为SM4密钥,
     * 并将其转换为十六进制字符串格式以便于使用和存储。
     *
     * @return 返回一个表示SM4密钥的十六进制字符串。
     */
    public static String generateSM4Key() {
        SecureRandom secureRandom = new SecureRandom();
        byte[] sm4Key = new byte[16]; // SM4 密钥长度为 128 位(16 字节)
        secureRandom.nextBytes(sm4Key);
        String key = bytesToHex(sm4Key);
        return key;
    }
    private static String bytesToHex(byte[] bytes) {
        StringBuilder sb = new StringBuilder();
        for (byte b : bytes) {
            sb.append(String.format("%02x", b));
        }
        return sb.toString();
    }
    /**
     * 使用SM4算法加密输入数据。
     *
     * @param key 加密密钥,应符合SM4算法的密钥长度要求。
     * @param input 待加密的输入数据。
     * @return 加密后的数据,以Base64编码形式表示。
     */
    public static String encrypt(byte[] key, byte[] input) {
        // 创建并初始化SM4加密器
        PaddedBufferedBlockCipher cipher = new PaddedBufferedBlockCipher(new SM4Engine(), new PKCS7Padding());
        cipher.init(true, new KeyParameter(key));  // ECB模式下不需要IV
        // 用于存储加密后的数据
        byte[] output = new byte[cipher.getOutputSize(input.length)];
        // 处理输入数据,进行加密
        int length = cipher.processBytes(input, 0, input.length, output, 0);
        // 完成加密过程,处理可能剩余的数据
        try {
            length += cipher.doFinal(output, length);
        } catch (Exception e) {
            e.printStackTrace();
        }
        // 使用Base64编码加密后的字节数组,并返回
        String encoded = Base64.getEncoder().encodeToString(Arrays.copyOf(output, length));
        return encoded;
    }
    /**
     * 使用SM4算法对输入数据进行解密
     *
     * @param key 密钥字节数组,用于解密数据
     * @param input 待解密的字节数组
     * @return 解密后的字节数组
     */
    public static byte[] decrypt(byte[] key, byte[] input) {
        // 创建基于SM4算法的缓冲分组密码对象
        PaddedBufferedBlockCipher cipher = new PaddedBufferedBlockCipher(new SM4Engine(), new PKCS7Padding());
        // 初始化密码对象为解密模式,并设置密钥参数
        cipher.init(false, new KeyParameter(key));  // ECB模式下不需要IV
        // 根据输入数据长度计算解密后的字节数组长度
        byte[] output = new byte[cipher.getOutputSize(input.length)];
        // 处理字节数组,将输入数据解密到输出字节数组中
        int length = cipher.processBytes(input, 0, input.length, output, 0);
        try {
            // 完成最终的解密操作,并将长度累加到已处理字节数组中
            length += cipher.doFinal(output, length);
        } catch (Exception e) {
            // 捕获并处理解密过程中的异常
            e.printStackTrace();
        }
        // 返回解密后的字节数组
        return Arrays.copyOf(output, length);
    }
    public static String decrypt(String keys,String secert){
        byte[] key = keys.getBytes(StandardCharsets.UTF_8);
        byte[] ming= Base64.getDecoder().decode(secert);
        byte[] text=decrypt(key,ming);
        return new String(text, StandardCharsets.UTF_8);
    }
    public static String encrypt(String keys, String input){
        byte[] key = keys.getBytes(StandardCharsets.UTF_8);
        return encrypt(key,input.getBytes());
    }
    public static void main(String[] args) {
        byte[] key = "jsimjrby3wqb7dbq".getBytes(StandardCharsets.UTF_8); // 16字节密钥
        // 原始明文
        String plaintext = "hello";
        String plaintext = "{\n" +
                "    \"deviceid\": [\n" +
                "        \"1581F5BMD22CK0014H2U\",\n" +
                "        \"1581F6QAD241800B6V95\"\n" +
                "    ],\n" +
                "    \"taskid\": \"b6e89a1e-5e89-4c9b-aa26-00faa4d8f568\",\n" +
                "    \"tasklist\": [\n" +
                "        {\n" +
                "            \"bsm\": \"2028107171717717107171017\",\n" +
                "            \"xzqdm\": \"310000\",\n" +
                "            \"dkbh\": \"ndbg201102U0172710711\",\n" +
                "            \"dklx\": \"ndbg2024\",\n" +
                "            \"dkmc\": \"小桥头\",\n" +
                "            \"dkmj\": 20.5,\n" +
                "            \"dkfw\": \"MULTIPOLYGON(((115.86528871951153 28.625287925196325,115.86561708513025 28.625787612007546,115.86815834948467 28.624602640426623,115.86773004650362 28.62425999804172,115.86528871951153 28.625287925196325)))\",\n" +
                "            \"bz\": null\n" +
                "        },\n" +
                "        {\n" +
                "            \"bsm\": \"202810717171777\",\n" +
                "            \"xzqdm\": \"310000\",\n" +
                "            \"dkbh\": \"ndbg201102U011\",\n" +
                "            \"dklx\": \"ndbg2024q\",\n" +
                "            \"dkmc\": \"桥头\",\n" +
                "            \"dkmj\": 27.5,\n" +
                "            \"dkfw\": \"MULTIPOLYGON(((115.8537683547021 28.626198084066036,115.85362014017156 28.625905772075246,115.85325749115422 28.625530171307133,115.8532121556319 28.625552314192735,115.85285649743213 28.625719691357663,115.8526650611681 28.62581016383709,115.85251948537035 28.62587896210428,115.8524159923293 28.625927871721817,115.85236695899066 28.625953724319036,115.85242053528945 28.626032126827145,115.85243919323472 28.626059431385023,115.85258924149208 28.626287013655055,115.85275847878526 28.62654053983997,115.85281562628226 28.62662918289837,115.8537683547021 28.626198084066036)))\",\n" +
                "            \"bz\": null\n" +
                "        }\n" +
                "    ]\n" +
                "}\n";
        String secert =encrypt(key,plaintext.getBytes());
//        System.out.println(secert);
        System.out.println("Encoded: " + encrypt(key, plaintext.getBytes(StandardCharsets.UTF_8)));
        // 解码并解密
        byte[] decoded = Base64.getDecoder().decode(encrypt(key, plaintext.getBytes(StandardCharsets.UTF_8)));
        byte[] ming= Base64.getDecoder().decode(secert);
        byte[] text=decrypt(key,ming);
//        System.out.println(new String(text, StandardCharsets.UTF_8));
        System.out.println(encrypt("jsimjrby3wqb7dbq",plaintext));
//        System.out.println("封装"+decrypt("jsimjrby3wqb7dbq","9LFnVDdqleTOFcBJT7TSxs788zPH8PicodLb5634SsixHrKNX+ZAgwODPZxvWFNQ"));
        String encryptedBase64 = encrypt(key, plaintext.getBytes(StandardCharsets.UTF_8));
//        System.out.println("Encrypted (Base64): " + encryptedBase64);
//        System.out.println(generateSM4Key());
        // 直接解密
        byte[] decoded = Base64.getDecoder().decode(encryptedBase64);
        byte[] decrypted = decrypt(key, decoded);
        // 输出结果
        System.out.println("Plaintext: " + plaintext);
        System.out.println("Encrypted (Base64): " + encrypt(key, plaintext.getBytes(StandardCharsets.UTF_8)));
        System.out.println("Decrypted: " + new String(decrypted, StandardCharsets.UTF_8));
//        // 输出结果
//        System.out.println("Plaintext: " + plaintext);
//        System.out.println("Decrypted: " + new String(decrypted, StandardCharsets.UTF_8));
    }
}