XML-Security-C is the C++ XML Signature and Encryption library from the Apache Software Foundation. It is used for all XML Signature and Encryption processing in OpenSAML and Shibboleth.
Project Website: http://xml.apache.org/security/c/
For now, build notes can be found in the BuildingShibboleth topic.
Note that version 1.3, required by OpenSAML 2 (C++ Edition), is not yet officially released, but will be at some point. The code is publically available in the Apache svn trunk:
http://svn.apache.org/repos/asf/xml/security/trunk/c
%COMMENT%