pyca/cryptography — pull request #613 by hynek (2014-02-14 08:56:17+00:00)
Title: Add X509_V_ERR_APPLICATION_VERIFICATION

This constant is useful when doing custom verifications.

That said we should consider to expose *all* of them (cf http://www.openssl.org/docs/apps/verify.html#DIAGNOSTICS ). This is the only one that is likely set by a user though.