feat: add randomstringgenerator

Util/RandomStringGenerator.cs

@@ -0,0 +1,26 @@
+using System.Security.Cryptography;
+using System.Text;
+
+namespace ZenithInfo.Util;
+
+public class RandomStringGenerator
+{
+    private static readonly char[] chars =
+        "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!@#$%^&*+?".ToCharArray();
+
+    public static string GenerateRandomString(int length)
+    {
+        var stringBuilder = new StringBuilder();
+        using (var rng = RandomNumberGenerator.Create())
+        {
+            byte[] buffer = new byte[1];
+            for (int i = 0; i < length; i++)
+            {
+                rng.GetBytes(buffer);
+                var randomIndex = buffer[0] % chars.Length;
+                stringBuilder.Append(chars[randomIndex]);
+            }
+        }
+        return stringBuilder.ToString();
+    }
+}