Add helpers for quickly generating unique IDs

ZuneImpl/Extensions.cs

@@ -3,6 +3,8 @@ using System.IO;
 using System.Threading;
 using System.Net.Http;
 using System.Threading.Tasks;
+using System.Security.Cryptography;
+using System.Text;
 
 namespace Microsoft.Zune;
 
@@ -24,4 +26,28 @@ internal static class Extensions
         return client.GetStreamAsync(uri);
     }
 #endif
+
+    public static int HashToInt32(this string id)
+    {
+        var hashBytes = id.Hash();
+        return BitConverter.ToInt32(hashBytes, 0) ^ BitConverter.ToInt32(hashBytes, 4);
+    }
+
+    public static Guid HashToGuid(this string id)
+    {
+        var hashBytes = id.Hash();
+        return new Guid(hashBytes);
+    }
+
+    public static long HashToInt64(this string id)
+    {
+        var hashBytes = id.Hash();
+        return BitConverter.ToInt64(hashBytes, 0);
+    }
+
+    public static byte[] Hash(this string id)
+    {
+        MD5 md5 = MD5.Create();
+        return md5.ComputeHash(Encoding.Default.GetBytes(id));
+    }
 }