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:
  - aes (AES-128/192/256 cipher software implementation)
  - 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)
  - fips-prf (PRF specified by FIPS, used by EAP-SIM/AKA algorithms)
  - gcrypt (Crypto backend based on libgcrypt, provides
    RSA/DH/ciphers/hashers/rng)
  - gmp (RSA/DH crypto backend based on libgmp)
  - hmac (HMAC wrapper using various hashers)
  - ldap (LDAP fetching plugin based on libldap)
  - md5 (MD5 hasher software implementation)
  - mgf1 (Mask Generation Functions based on the SHA-1, SHA-256 and SHA-512)
  - padlock (VIA padlock crypto backend, provides AES128/SHA1)
  - pgp (PGP encoding/decoding routines)
  - pkcs11 (PKCS#11 smartcard backend)
  - pkcs12 (PKCS#12 decoding routines)
  - rc2 (RC2 cipher software implementation)
  - rdrand (High quality / high performance random source using the Intel
    rdrand instruction found on Ivy Bridge processors)
  - sha1 (SHA1 hasher software implementation)
  - sha2 (SHA256/SHA384/SHA512 hasher software implementation)
  - test-vectors (Set of test vectors for various algorithms)
  - xcbc (XCBC wrapper using various ciphers)
 .
 Also included is the libtpmtss library adding support for TPM plugin
 (https://wiki.strongswan.org/projects/strongswan/wiki/TpmPlugin)