(feature): add otp secret generation

src/MaksIT.Core.Tests/Security/TtopGeneratorTests.cs

@@ -1,4 +1,5 @@
-using MaksIT.Core.Security;
+using MaksIT.Core.Extensions;
+using MaksIT.Core.Security;
 using System;
 using Xunit;
 
@@ -65,5 +66,17 @@ namespace MaksIT.Core.Tests.Security {
       // Assert
       Assert.True(timestep >= 0);
     }
+
+    [Fact]
+    public void GenerateSecret_ReturnsValidBase32String() {
+      // Act
+      var secret = TotpGenerator.GenerateSecret();
+
+      // Assert
+      Assert.False(string.IsNullOrEmpty(secret));
+      Assert.True(secret.IsBase32String());
+    }
+
+    
   }
 }

src/MaksIT.Core/Extensions/StringExtensions.cs

@@ -262,5 +262,15 @@ namespace MaksIT.Core.Extensions {
 
       return dt;
     }
+
+    public static bool IsBase32String(this string input) {
+      // Base32 characters are A-Z and 2-7
+      foreach (char c in input) {
+        if (!((c >= 'A' && c <= 'Z') || (c >= '2' && c <= '7'))) {
+          return false;
+        }
+      }
+      return true;
+    }
   }
 }

src/MaksIT.Core/MaksIT.Core.csproj

@@ -8,7 +8,7 @@
 
     <!-- NuGet package metadata -->
     <PackageId>MaksIT.Core</PackageId>
-    <Version>1.0.6</Version>
+    <Version>1.0.7</Version>
     <Authors>Maksym Sadovnychyy</Authors>
     <Company>MAKS-IT</Company>
     <Product>MaksIT.Core</Product>

src/MaksIT.Core/Security/TtopGenerator.cs

@@ -59,5 +59,16 @@ public static class TotpGenerator {
     var unixTimestamp = DateTimeOffset.UtcNow.ToUnixTimeSeconds();
     return unixTimestamp / Timestep;
   }
+
+
+  public static string GenerateSecret() {
+    // Example of generating a 32-character base32 secret for TOTP
+    var random = new byte[20];
+    using (var rng = RandomNumberGenerator.Create()) {
+      rng.GetBytes(random);
+    }
+
+    return Base32Encoder.Encode(random); // You can use a Base32 encoder to generate the secret.
+  }
 }