IAIK (Institute for Applied Information Processing and Communications) participated fully and with complete success in the early Canonical XML interoperability testing. It was a successful participant in the XMLDSIG interoperability testing as well, missing only a few points relating to optional XSLT features and Minimal Canonicalization (which no one else implemented either). It successfully interoperated for all Exclusive XML Canonicalization features tested.
The IAIK XML Signature Library (IXSIL) is available at
A set of signature test vectors produced by Gregor Karlinger of IAIK is maintained at