I think this is correct

maxton · maxton · commit 882bae6c3bb8 · 2017-03-26T05:29:25.000-04:00
diff --git a/Library/Ark/ProtectedFileStream.cs b/Library/Ark/ProtectedFileStream.cs
@@ -123,6 +123,10 @@ public override long Seek(long offset, SeekOrigin origin)
         pkg.Position = data_offset + _position - 1;
         key = (byte)((metadata[5] ^ pkg.ReadByte()) - _position + 1);
       }
+      else if(_position == 0)
+      {
+        key = metadata[5];
+      }
 
       return _position;
     }

Original file line number	Diff line number	Diff line change
`@@ -123,6 +123,10 @@ public override long Seek(long offset, SeekOrigin origin)`
`123`	`123`	`pkg.Position = data_offset + _position - 1;`
`124`	`124`	`key = (byte)((metadata[5] ^ pkg.ReadByte()) - _position + 1);`
`125`	`125`	`}`
	`126`	`+ else if(_position == 0)`
	`127`	`+ {`
	`128`	`+ key = metadata[5];`
	`129`	`+ }`
`126`	`130`
`127`	`131`	`return _position;`
`128`	`132`	`}`