strongSwan utility and crypto library (extra plugins)

 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 extra plugins for the strongSwan utility and
 cryptographic library.
 .
 Included plugins are:
  - af-alg [linux] (AF_ALG Linux crypto API interface, provides
    ciphers/hashers/hmac/xcbc)
  - ccm (CCM cipher mode wrapper)
  - cmac (CMAC cipher mode wrapper)
  - ctr (CTR cipher mode wrapper)
  - curl (libcurl based HTTP/FTP fetcher)
  - curve25519 (support for Diffie-Hellman group 31 using Curve25519 and
    support for the Ed25519 digital signature algorithm for IKEv2)
  - gcrypt (Crypto backend based on libgcrypt, provides
    RSA/DH/ciphers/hashers/rng)
  - ldap (LDAP fetching plugin based on libldap)
  - ntru (key exchanged based on post-quantum computer NTRU)
  - padlock (VIA padlock crypto backend, provides AES128/SHA1)
  - pkcs11 (PKCS#11 smartcard backend)
  - rdrand (High quality / high performance random source using the Intel
    rdrand instruction found on Ivy Bridge processors)
  - test-vectors (Set of test vectors for various algorithms)
 .
 Also included is the libtpmtss library adding support for TPM plugin
 (https://wiki.strongswan.org/projects/strongswan/wiki/TpmPlugin)