Hi, If anyone is interested, I published a blog post about c14n (programming tips). This is not directly related to OpenSSL but as an example it uses generated sample signed XML files (XMLDSig) where `openssl' tool comes very handy.
http://kriscience.blogspot.co.uk/2013/05/c14n-for-signed-xml.html Any comments are welcome. Cheers, Kris