pyca/cryptography — pull request #1139 by lvh (2014-06-16 14:06:04+00:00)
Title: OpenSSL certificate verification error codes

I'm not entirely sure where to put this. `err.py` seems like the best place, but `x509.py` has `X509_verify_cert_error_string` (which was already bound for some reason). `ssl.py` had two of these error codes, which are now removed.