[jwl]

You got to consider your most likely risk for attack. Targeted or at random by a botnet? For example, you are most likely more secure in practice by writing your own website than using Wordpress, simply because you are more likely to get hit by a botnet targeting every Wordpress site than someone going directly for you.

[ZoFreX]

This is off-topic. We are talking about security vs obscurity in the context of cryptography libraries.

[palunon]

Replace WordPress with OpenSSL and website with crypto.