feat: implement machine key provider

- implement logic for hashing machine key
- extracted interfaces

src/StevanFreeborn.Extensions.Configuration.Secure/Cryptography/IMachineIdKeyGenerator.cs

@@ -0,0 +1,6 @@
+namespace StevanFreeborn.Extensions.Configuration.Secure.Cryptography;
+
+internal interface IMachineIdKeyGenerator
+{
+  string GetId();
+}

src/StevanFreeborn.Extensions.Configuration.Secure/Cryptography/IMachineIdKeyProvider.cs

@@ -0,0 +1,6 @@
+namespace StevanFreeborn.Extensions.Configuration.Secure.Cryptography;
+
+internal interface IEncryptionKeyProvider
+{
+  byte[] GetKey();
+}

src/StevanFreeborn.Extensions.Configuration.Secure/Cryptography/MachineIdKeyGenerator.cs

@@ -5,11 +5,6 @@ using Microsoft.Extensions.Logging;
 
 namespace StevanFreeborn.Extensions.Configuration.Secure.Cryptography;
 
-internal interface IMachineIdKeyGenerator
-{
-  string GetId();
-}
-
 internal sealed class MachineIdKeyGenerator : IMachineIdKeyGenerator
 {
   private const string IOPlatformUUID = nameof(IOPlatformUUID);
@@ -111,4 +106,4 @@ internal static partial class LogMessages
       Message = "Using fallback strategy for Machine ID generation."
   )]
   public static partial void LogUsingFallbackStrategy(this ILogger logger);
-}
+}

src/StevanFreeborn.Extensions.Configuration.Secure/Cryptography/MachineIdKeyProvider.cs

@@ -1,5 +1,17 @@
+using System.Security.Cryptography;
+using System.Text;
+
 namespace StevanFreeborn.Extensions.Configuration.Secure.Cryptography;
 
-internal sealed class MachineIdKeyProvider
+internal sealed class MachineIdKeyProvider(IMachineIdKeyGenerator generator) : IEncryptionKeyProvider
 {
+  private readonly IMachineIdKeyGenerator _generator = generator;
+
+  public byte[] GetKey()
+  {
+    var machineId = _generator.GetId();
+    var @bytes = Encoding.UTF8.GetBytes(machineId);
+    using var sha256 = SHA256.Create();
+    return sha256.ComputeHash(@bytes);
+  }
 }