libcrypt-openssl-rsa-perl binary package in Ubuntu Oracular amd64

 Crypt::OpenSSL::RSA is a Perl module that provides glue to the RSA functions
 in the OpenSSL library. It provides the following functionalities: create a
 key from a string, make a new key, save key to a string, save public portion
 of key to a string using format compatible with OpenSSL's command-line rsa
 tool, encrypt, decrypt, sign, verify, return the size in bytes of a key,
 check the validity of a key.

Source package