1 ext/ -> Implementation of TLS extensions
2 auth/ -> Implementation of TLS authentication methods (DHE, SRP etc.)
3 accelerated/ -> Implementation of cipher acceleration
6 x509/ -> Implementation of GnuTLS X.509 certificate support (and more)
7 openpgp/ -> Implementation of GnuTLS openpgp support
8 opencdk/ -> Implementation of low level openpgp packet parsing
9 minitasn1 -> ASN.1 structure parsing library
12 nettle/ -> -> The nettle crypto back-end
13 gcrypt/ -> -> The libgcrypt crypto back-end