212637 Detached XML Digital Signature

I have developed a VB6 land survey computation appplication that outputs 16 ASCII files (1 or 2 of which may be empty), 1 PDF file and 1 or more Tif files. These 16 ASCII files have different file extensions. These files together with a detached XML digital signature are to be sent to local authorities for approval. These files must not be encrypted. The certificate details are also not to be encrypted. Can you provide any tools for generating such XML digital signature file? An example for such signature file is attached herewith. The tool can be a stand alone program or preferably a sub-program that can be included in my application. In the attached XML file, the files to be signed are PUBL373-2006.*, [login to view URL], PA*.tif.