[#19] Client: Use specific classes for search

Signed-off-by: Pavel Gross <p.gross@yando.com>

src/FrostFS.SDK.Cryptography/UUID.cs

@@ -7,18 +7,49 @@ public static class UUIDExtension
 {
     public static Guid ToUuid(this ByteString id)
     {
-        return Guid.Parse(BitConverter.ToString(id.ToByteArray()).Replace("-", ""));
+        var bytes = id.ToByteArray();
+        
+        var orderedBytes = GetGuidBytesDirectOrder(bytes);
+
+        return new Guid(orderedBytes);
     }
     
+    /// <summary>
+    /// Serializes Guid to binary representation in direct order bytes format
+    /// </summary>
+    /// <param name="id"></param>
+    /// <returns></returns>
     public static byte[] ToBytes(this Guid id)
     {
-        var str = id.ToString("N");
-        var len = str.Length;
-        var bytes = new byte[len/2];
+        var bytes = id.ToByteArray();
 
-        for (int i = 0; i < len; i += 2)
-            bytes[i/2] = Convert.ToByte(str.Substring(i, 2), 16);
-        
-        return bytes;
+        var orderedBytes = GetGuidBytesDirectOrder(bytes);
+
+        return orderedBytes;
+    }
+
+    private static byte[] GetGuidBytesDirectOrder(byte[] source)
+    {
+        if (source.Length != 16)
+            throw new ArgumentException("Wrong uuid binary format");
+
+        return [
+            source[3],
+            source[2],
+            source[1],
+            source[0],
+            source[5],
+            source[4],
+            source[7],
+            source[6],
+            source[8],
+            source[9],
+            source[10],
+            source[11],
+            source[12],
+            source[13],
+            source[14],
+            source[15]
+        ];
     }
 }