python3-service-identity 14.0.0-1 (amd64 binary) in ubuntu xenial

 Service_identity aspires to give you all the tools you need for verifying
 whether a certificate is valid for the intended purposes.
 .
 In the simplest case, this means host name verification. However,
 service_identity implements RFC 6125 fully and plans to add other
 relevant RFCs too.