feat: 优化加密方法及异常处理

src/main/java/cc/baka9/catseedlogin/util/CommunicationAuth.java

@@ -5,27 +5,23 @@
 
 public class CommunicationAuth {
 
-    private static MessageDigest messageDigest;
+    private static final MessageDigest messageDigest;
 
     static {
         try {
             messageDigest = MessageDigest.getInstance("SHA-256");
         } catch (NoSuchAlgorithmException e) {
-            // 适当地处理异常
-            e.printStackTrace();
+            throw new RuntimeException("SHA-256 algorithm not found", e);
         }
     }
 
     public static String encryption(String... args) {
         String paramString = String.join("", args);
         byte[] arrayOfByte = messageDigest.digest(paramString.getBytes());
-        StringBuilder stringBuilder = new StringBuilder();
+        StringBuilder stringBuilder = new StringBuilder(arrayOfByte.length * 2);
         for (byte value : arrayOfByte) {
-            int unsignedByte = value & 0xff;
-            if (unsignedByte < 16) stringBuilder.append("0");
-            stringBuilder.append(Integer.toHexString(unsignedByte));
+            stringBuilder.append(String.format("%02x", value & 0xff));
         }
-        return stringBuilder.toString().toLowerCase();
+        return stringBuilder.toString();
     }
-
-}
+}