Apache XML Security for C++
The Apache XML Security for C++ library is an implementation of the XML Digital Signature and Encryption specifications, along with some additional XKMS code. It is designed to be easily ported to new platforms, and is generally tested on Windows, Linux, OS X, and Solaris. Other platforms with autoconf support may also work.
The library makes use of the Apache Xerces-C XML Parser and Xalan-C XSLT processor. The latter is used for processing XPath and XSLT transforms. The use of Xalan-C is optional, but without it, XPath and XSLT transformations cannot be performed.
In addition, the library currently uses OpenSSL to provide cryptographic functionality. The cryptographic interface is implemented via a thin wrapper layer, and development versions of implementations for the Windows Cryptographic API and NSS have also been implemented.
Version 1.7.3 of the Apache XML Security for C++ library has been released. This is a bug fix release primarily addressing problems with ECDSA signature generation and several reported issues with the Windoes CAPI support.
See here for old news.