This is an application that can generate and verify the rsa signature of .nds files. It is not possible to officialy sign .nds files because the private key is only known by Nintendo. It is possible to test the sign/verify process with the "homebrew" key, which was generated by the author for testing purposes
http://users.belgacom.net/bn967347/ndsrsa_03.png
http://users.belgacom.net/bn931507/nds_rsa_1_1.zip
