基础模块：新增aes对称加密工具类

2026-08-12 21:02:08 +08:00 · 2024-08-26 17:48:42 +08:00
parent 5f252426cc
commit ee1a2777ff
1 changed files with 99 additions and 0 deletions
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+package com.cf.imes.framework.common.util.encrypt;
+
+import cn.hutool.core.util.CharsetUtil;
+import lombok.extern.slf4j.Slf4j;
+
+import javax.crypto.Cipher;
+import javax.crypto.KeyGenerator;
+import javax.crypto.SecretKey;
+import javax.crypto.spec.IvParameterSpec;
+import java.security.GeneralSecurityException;
+import java.security.NoSuchAlgorithmException;
+import java.security.SecureRandom;
+import java.util.Base64;
+
+/**
+ * AES对称加密工具
+ *
+ * @author Gqr
+ * @since 2024/8/23 16:38
+ */
+@Slf4j
+public class AesUtils {
+
+    private static final String AES_ALG = "AES";
+
+    private static final String AES_CBC_PCK_ALG = "AES/CBC/PKCS5Padding";
+
+
+    /**
+     * 解密
+     *
+     * @param content
+     * @param aesKey
+     * @return
+     * @throws Exception
+     */
+    public static String decrypt(String content, String aesKey) {
+        try {
+            Cipher cipher = Cipher.getInstance(AES_CBC_PCK_ALG);
+            IvParameterSpec iv = new IvParameterSpec(initIv(AES_CBC_PCK_ALG));
+            cipher.init(Cipher.DECRYPT_MODE, generateKey(aesKey.getBytes()), iv);
+
+            byte[] cleanBytes = cipher.doFinal(Base64.getDecoder().decode(content.getBytes()));
+            return new String(cleanBytes, CharsetUtil.UTF_8);
+        } catch (Exception e) {
+            log.error("[AesUtils][decrypt]解密失败：{}", e.getMessage(), e);
+            // nacos热发布配置，空字符串会导致nacos轮训刷新配置
+            return "default";
+        }
+    }
+
+    /**
+     * 生成key
+     *
+     * @param bytes
+     * @return
+     * @throws NoSuchAlgorithmException
+     */
+    private static SecretKey generateKey(byte[] bytes) throws NoSuchAlgorithmException {
+        // 生成随机数
+        SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
+        // 设置随机数种子
+        random.setSeed(bytes);
+
+        // aes算法生成器
+        KeyGenerator keyGen = KeyGenerator.getInstance(AES_ALG);
+        keyGen.init(128, random); // 使用128位的密钥
+        return keyGen.generateKey();
+    }
+
+
+    /**
+     * 初始向量的方法, 全部为0. 这里的写法适合于其它算法,针对AES算法的话,IV值一定是128位的(16字节).
+     *
+     * @param fullAlg
+     * @return
+     * @throws GeneralSecurityException
+     */
+    private static byte[] initIv(String fullAlg) {
+
+        try {
+            Cipher cipher = Cipher.getInstance(fullAlg);
+            int blockSize = cipher.getBlockSize();
+            byte[] iv = new byte[blockSize];
+            for (int i = 0; i < blockSize; ++i) {
+                iv[i] = 0;
+            }
+            return iv;
+        } catch (Exception e) {
+
+            int blockSize = 16;
+            byte[] iv = new byte[blockSize];
+            for (int i = 0; i < blockSize; ++i) {
+                iv[i] = 0;
+            }
+            return iv;
+        }
+    }
+}