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