I've created a gist that shows code that works in 1.6.8, but returns the wrong value in 1.7.0.

https://gist.github.com/3947534

This leads to this line throwing an error because privKey is null: https://github.com/jruby/jruby/blob/master/src/org/jruby/ext/openssl/PKeyRSA.java#L469