Manual Verification of SSL/TLS Certificate Trust Chains using Openssl

I found two article about verification of SSL/TLS certificate Trust Chain by using manual verification technique.

Part One:
http://blog.taddong.com/2010/04/manual-verification-of-ssltls.html
Part Two:
http://blog.taddong.com/2010/04/manual-verification-of-ssltls_24.html

To read more, please refer to this link:

http://isc.sans.org/diary.html?storyid=8686