Version 1.70 is available upstream. Please consider updating!
It seems that version 1.70 is available upstream, while the latest version in the Gentoo tree is 1.69. You think this warning is false? Read more about it here.
"The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5 to JDK 1.8."