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+package com.jzg.quotation.ansheng.crawler.utils;
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+
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+import javax.crypto.Cipher;
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+import java.nio.charset.StandardCharsets;
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+import java.security.KeyFactory;
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+import java.security.PublicKey;
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+import java.security.spec.X509EncodedKeySpec;
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+import java.util.Base64;
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+
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+/**
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+ * RSA加密工具类
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+ *
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+ * @author YourName
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+ * @date 2026-08-25
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+ */
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+public class RSAUtils {
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+
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+ private static final String PUBLIC_KEY = "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAy+4Uy6zba9JeGu7LR7krxkQ+Ivt7MIl+jR/F0rCoPUDPlqvrKIQAeRlJ8txkLSskLAU9f2F2bjbUmzlBdrxVPz/mPIXA866SAd4ELTAdF3oltCa9yLPERLCLMEwUAjX2lUSS3gxAuXbIuPuVJQi1xQeV+VRiJulMFNjhlq86bRpsc7SZ0rMF3Ahc9WHxulcXofaDRLx+sTxzeTsZC3zCh5Dk2hnHaj7o2C/n8U6ZvfifKeB2kWZyoFlmgX8/6agSfkmdxuTw5CZk9qU/1k0ykg2N5whBfnaMbUD5P08KuU/eBIEriS7U7yQruVfovsgN+c2h4XPEcMG0WrqWZbRNpQIDAQAB";
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+
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+
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+ private static volatile PublicKey publicKey;
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+
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+ /**
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+ * 获取公钥
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+ */
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+ public static PublicKey getPublicKey() {
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+ if (publicKey == null) {
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+ synchronized (RSAUtils.class) {
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+ if (publicKey == null) {
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+ publicKey = parsePublicKey();
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+ }
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+ }
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+ }
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+ return publicKey;
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+ }
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+
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+ /**
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+ * 解析公钥
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+ */
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+ private static PublicKey parsePublicKey() {
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+ try {
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+ byte[] keyBytes = Base64.getDecoder().decode(PUBLIC_KEY);
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+ X509EncodedKeySpec spec = new X509EncodedKeySpec(keyBytes);
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+ KeyFactory keyFactory = KeyFactory.getInstance("RSA");
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+ return keyFactory.generatePublic(spec);
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+ } catch (Exception e) {
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+ throw new RuntimeException("解析RSA公钥失败", e);
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+ }
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+ }
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+
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+ /**
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+ * RSA加密
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+ *
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+ * @param plaintext 明文
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+ * @return Base64编码的密文
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+ * @throws RuntimeException 加密失败时抛出
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+ */
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+ public static String encrypt(String plaintext) {
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+ if (plaintext == null) {
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+ throw new IllegalArgumentException("明文不能为null");
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+ }
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+
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+ try {
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+ Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
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+ cipher.init(Cipher.ENCRYPT_MODE, getPublicKey());
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+
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+ byte[] encrypted = cipher.doFinal(plaintext.getBytes(StandardCharsets.UTF_8));
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+ return Base64.getEncoder().encodeToString(encrypted);
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+ } catch (Exception e) {
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+ throw new RuntimeException("RSA加密失败", e);
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+ }
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+ }
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+
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+ /**
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+ * RSA加密（带最大长度限制检查）
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+ * RSA最大加密长度为 密钥长度/8 - 11（PKCS1Padding）
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+ * 对于2048位密钥，最大加密长度为245字节
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+ *
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+ * @param plaintext 明文
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+ * @return Base64编码的密文
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+ * @throws IllegalArgumentException 明文过长时抛出
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+ */
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+ public static String encryptWithCheck(String plaintext) {
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+ if (plaintext == null) {
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+ throw new IllegalArgumentException("明文不能为null");
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+ }
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+
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+ // 2048位密钥，PKCS1Padding最大加密长度为245字节
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+ int maxLength = 245;
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+ byte[] plainBytes = plaintext.getBytes(StandardCharsets.UTF_8);
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+ if (plainBytes.length > maxLength) {
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+ throw new IllegalArgumentException(
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+ String.format("明文长度超过最大加密长度限制：当前%d字节，最大%d字节",
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+ plainBytes.length, maxLength)
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+ );
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+ }
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+
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+ return encrypt(plaintext);
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+ }
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+
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+ /**
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+ * 验证公钥是否有效
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+ */
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+ public static boolean isPublicKeyValid() {
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+ try {
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+ return getPublicKey() != null;
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+ } catch (Exception e) {
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+ return false;
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+ }
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+ }
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+
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+}
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