From 84cb99d087f62dca89fa682feae6738b3350fed4 Mon Sep 17 00:00:00 2001
From: crupest <crupest@outlook.com>
Date: Sun, 17 Apr 2022 22:55:32 +0800
Subject: ...

---
 BackEnd/Timeline/Helpers/SecureRandomExtensions.cs | 29 ++++++++++++++++++++++
 1 file changed, 29 insertions(+)
 create mode 100644 BackEnd/Timeline/Helpers/SecureRandomExtensions.cs

(limited to 'BackEnd/Timeline/Helpers')

diff --git a/BackEnd/Timeline/Helpers/SecureRandomExtensions.cs b/BackEnd/Timeline/Helpers/SecureRandomExtensions.cs
new file mode 100644
index 00000000..b4f3f7f0
--- /dev/null
+++ b/BackEnd/Timeline/Helpers/SecureRandomExtensions.cs
@@ -0,0 +1,29 @@
+using System;
+using System.Security.Cryptography;
+using System.Text;
+
+namespace Timeline.Helpers
+{
+    public static class SecureRandomExtensions
+    {
+        private static readonly char[] AlphaDigitString = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ".ToCharArray();
+
+        public static string GenerateAlphaDigitString(this RandomNumberGenerator randomNumberGenerator, int length)
+        {
+            if (length <= 0) throw new ArgumentOutOfRangeException(nameof(length));
+
+            var buffer = new byte[length];
+            randomNumberGenerator.GetBytes(buffer);
+
+            StringBuilder stringBuilder = new();
+
+            foreach (byte b in buffer)
+            {
+                stringBuilder.Append(AlphaDigitString[b % AlphaDigitString.Length]);
+            }
+
+            return stringBuilder.ToString();
+        }
+    }
+}
+
-- 
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