strongswan-plugin-openssl 5.3.5-1ubuntu3.5 (amd64 binary) in ubuntu xenial

 The strongSwan VPN suite uses the native IPsec stack in the standard
 Linux kernel. It supports both the IKEv1 and IKEv2 protocols.
 .
 This package provides the crypto backend based on OpenSSL for strongSwan,
 providing RSA/ECDSA/DH/ECDH/ciphers/hashers/HMAC/X.509/CRL/RN
 .
 This plugin is now included in libstrongswan-standard-plugins. This package can
 be safely removed once it's installed.