package com.hxzk.gps.util.AES;
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import javax.crypto.Cipher;
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import javax.crypto.spec.IvParameterSpec;
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import javax.crypto.spec.SecretKeySpec;
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import java.nio.charset.StandardCharsets;
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import java.security.SecureRandom;
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import java.util.Base64;
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public class AES {
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private static final String ALGORITHM = "AES";
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private static final String TRANSFORMATION = "AES/CBC/PKCS5Padding";
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private static final String PUBLIC_KEY = "KTbVslm2mvQLoD3p";
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private static final int IV_SIZE = 16; // AES 的 IV 长度为 16 字节
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/**
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* 加密方法
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*
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* @param plainText 明文
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* @return 加密后的 Base64 编码字符串，包含 IV 和密文
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* @throws Exception 异常
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*/
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public static String encrypt(String plainText) throws Exception {
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// 生成随机的 IV
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byte[] ivBytes = new byte[IV_SIZE];
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SecureRandom secureRandom = new SecureRandom();
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secureRandom.nextBytes(ivBytes);
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IvParameterSpec iv = new IvParameterSpec(ivBytes);
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byte[] keyBytes = PUBLIC_KEY.getBytes(StandardCharsets.UTF_8);
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SecretKeySpec secretKeySpec = new SecretKeySpec(keyBytes, ALGORITHM);
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Cipher cipher = Cipher.getInstance(TRANSFORMATION);
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cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec, iv);
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byte[] encryptedBytes = cipher.doFinal(plainText.getBytes(StandardCharsets.UTF_8));
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// 将 IV 和密文拼接在一起
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byte[] combined = new byte[IV_SIZE + encryptedBytes.length];
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System.arraycopy(ivBytes, 0, combined, 0, IV_SIZE);
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System.arraycopy(encryptedBytes, 0, combined, IV_SIZE, encryptedBytes.length);
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return Base64.getEncoder().encodeToString(combined);
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}
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/**
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* 解密方法
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*
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* @param encryptedText 加密后的 Base64 编码字符串，包含 IV 和密文
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* @return 解密后的明文
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* @throws Exception 异常
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*/
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public static String decrypt(String encryptedText) throws Exception {
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// 将空格替换成 = 号
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String replacedText = encryptedText.replace(" ", "+");
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byte[] combined = Base64.getDecoder().decode(replacedText);
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// 提取 IV
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byte[] ivBytes = new byte[IV_SIZE];
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System.arraycopy(combined, 0, ivBytes, 0, IV_SIZE);
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IvParameterSpec iv = new IvParameterSpec(ivBytes);
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// 提取密文
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byte[] encryptedBytes = new byte[combined.length - IV_SIZE];
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System.arraycopy(combined, IV_SIZE, encryptedBytes, 0, encryptedBytes.length);
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byte[] keyBytes = PUBLIC_KEY.getBytes(StandardCharsets.UTF_8);
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SecretKeySpec secretKeySpec = new SecretKeySpec(keyBytes, ALGORITHM);
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Cipher cipher = Cipher.getInstance(TRANSFORMATION);
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cipher.init(Cipher.DECRYPT_MODE, secretKeySpec, iv);
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byte[] decryptedBytes = cipher.doFinal(encryptedBytes);
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return new String(decryptedBytes, StandardCharsets.UTF_8);
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}
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public static void main(String[] args) {
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try {
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// 模拟从请求中获取的参数
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String param1 = "szhang";
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String param2 = "SZhang13439350593";
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// 多次加密相同的参数
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String encryptedParam1 = encrypt(param1);
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String encryptedParam2 = encrypt(param2);
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System.out.println("加密后的 username: " + encryptedParam1);
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System.out.println("加密后的 password: " + encryptedParam2);
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// 解密参数
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String decryptedParam1 = decrypt(encryptedParam1);
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String decryptedParam2 = decrypt(encryptedParam2);
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System.out.println("解密后的 username: " + decryptedParam1);
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System.out.println("解密后的 password: " + decryptedParam2);
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} catch (Exception e) {
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e.printStackTrace();
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}
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}
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}
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