Add transport layer security (TLS) to any Julia Stream

Installation: Pkg.add("GnuTLS")

GnuTLS.jl can add TLS support to any transport layer implementing the Julia IOinterface (e.g. IOStream, TcpSocket, NamedPipe, TTY, ...)

The following functions are currently provided:

• GnuTLS.Session()

  Create a new SSL/TLS session. After initialization this object becomes a valid Julia IO object and may be used as such.

  NOTE: This method is not exported by default and should be used as GnuTLS.Session

• GnuTLS.CertificateStore()

  Initialize an empty certificate store. Support for authentication is incomplete in the current version

  NOTE: This method is not exported by default and should be used as GnuTLS.CertificateStore

• set_credentials!(s::Session,c::CertificateStore)

  Associates the CertificateStore c with the session s. The certificate from the server will be stored here and may later be validated before processing further requests.

• set_priority_string!(s::Session,priority::ASCIIString="NORMAL")

  Set the GnuTLS priority string, used to determin which protocol versions to support. For a full list of supported options, see the GnuTLS manual

• associate_stream{S<:IO,T<:IO}(s::Session, read::S, write::T=read)

  Set the transport layer for the current session.

• handshake!(s::Session)

  Perform the SSL/TLS handshake. On success the Session becomes active and may be used like any other streaming IO object.

• init()

  Initialize the GnuTLS library. This function is automatically called when the package is loaded and thus you should rarely have to call it yourself.

• deinit()

  Undo init and free all associated resources.

The following code snippet demonstrates how the GnuTLS.jl package may be used to query an HTTPS resource:

	using GnuTLS
	sess = GnuTLS.Session()
	set_priority_string!(sess)
	set_credentials!(sess,GnuTLS.CertificateStore())
	associate_stream(sess,connect("github.com",443))
	handshake!(sess)
	write(sess,"GET / HTTP/1.1\r\n\r\n")
	print(readall(sess))