'
'  Copyright(C) 2006 Cameron Rich
'
'  This program is free software you can redistribute it and/or modify
'  it under the terms of the GNU General Public License as published by
'  the Free Software Foundation either version 2.1 of the License, or
'  (at your option As ) any later version.
'
'  This program is distributed in the hope that it will be useful,
'  but WITHOUT ANY WARRANTY without even the implied warranty of
'  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
'  GNU Lesser General Public License for more details.
'
'  You should have received a copy of the GNU General Public License
'  along with this program if not, write to the Free Software
'  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
'

'
' A wrapper around the unmanaged Integererface to give a semi-decent VB.NET API
'

Imports System
Imports System.Runtime.InteropServices
Imports System.Net.Sockets
Imports axTLSvb

Namespace axTLSvb
    Public Class SSL
        Public m_ssl As IntPtr

        Public Sub New(ByRef ip As IntPtr)
            m_ssl = ip
        End Sub

        Public Sub Dispose()
            axtls.ssl_free(m_ssl)
        End Sub

        Public Function HandshakeStatus() As Integer
            Return axtls.ssl_handshake_status(m_ssl)
        End Function

        Public Function GetCipherId() As Byte
            Return axtls.ssl_get_cipher_id(m_ssl)
        End Function

        Public Function GetSessionId() As Byte()
            Dim result(axtls.SSL_SESSION_ID_SIZE) As Byte
            Dim ptr As IntPtr = axtls.ssl_get_session_id(m_ssl)
            Marshal.Copy(ptr, result, 0, axtls.SSL_SESSION_ID_SIZE)
            Return result
        End Function

        Public Function GetCertificateDN(component As Integer) As String
            Return axtls.ssl_get_cert_dn(m_ssl, component)
        End Function
    End Class

    Public Class SSLUtil
        Private dummy As Integer    ' need something here

        Public Shared Function BuildMode() As Integer
            Return axtls.ssl_get_config(axtls.SSL_BUILD_MODE)
        End Function

        Public Shared Function MaxCerts() As Integer
            Return axtls.ssl_get_config(axtls.SSL_MAX_CERT_CFG_OFFSET)
        End Function

        Public Shared Function MaxCACerts() As Integer
            Return axtls.ssl_get_config(axtls.SSL_MAX_CA_CERT_CFG_OFFSET)
        End Function

        Public Shared Function HasPEM() As Boolean
            If axtls.ssl_get_config(axtls.SSL_HAS_PEM) > 0 Then
                Return True
            Else
                Return False
            End If
        End Function
        
        Public Shared Sub DisplayError(ByVal error_code As Integer)
            axtls.ssl_display_error(error_code)
        End Sub

        Public Shared Function Version() As String
            Return axtls.ssl_version()
        End Function
    End Class

    Public Class SSLCTX
        Protected m_ctx As IntPtr

        Protected Sub New(ByVal options As Integer, _
                ByVal num_sessions As Integer)
            m_ctx = axtls.ssl_ctx_new(options, num_sessions)
        End Sub

        Public Sub Dispose()
            axtls.ssl_ctx_free(m_ctx)
        End Sub

        Public Function Read(ByVal ssl As SSL, ByRef in_data As Byte()) As Integer
            Dim ptr As IntPtr = IntPtr.Zero
            Dim ret as Integer = axtls.ssl_read(ssl.m_ssl, ptr)

            If ret > axtls.SSL_OK Then
                ReDim in_data(ret)
                Marshal.Copy(ptr, in_data, 0, ret)
            Else
                in_data = Nothing
            End If

            Return ret
        End Function

        Public Function Write(ByVal ssl As SSL, _
                ByVal data As Byte(), len As Integer) As Integer
            Return axtls.ssl_write(ssl.m_ssl, data, len)
        End Function

        Public Function Find(ByVal s As Socket) As SSL
            Dim client_fd As Integer = s.Handle.ToInt32()
            Return New SSL(axtls.ssl_find(m_ctx, client_fd))
        End Function

        Public Function VerifyCert(ByVal ssl As SSL) As Integer
            Return axtls.ssl_verify_cert(ssl.m_ssl)
        End Function

        Public Function Renegotiate(ByVal ssl As SSL) As Integer
            Return axtls.ssl_renegotiate(ssl.m_ssl)
        End Function

        Public Function ObjLoad(ByVal obj_type As Integer, _
                ByVal filename As String, _
                password As String) As Integer
            Return axtls.ssl_obj_load(m_ctx, obj_type, filename, password)
        End Function

        Public Function ObjLoad(ByVal obj_type As Integer, _
                ByVal data As Byte(), ByVal len As Integer, _
                password As String) As Integer
            Return axtls.ssl_obj_memory_load( _
                    m_ctx, obj_type, data, len, password)
        End Function
    End Class

    Public Class SSLServer 
            Inherits SSLCTX

        Public Sub New(ByVal options As Integer, _
                ByVal num_sessions As Integer)
            MyBase.New(options, num_sessions)
        End Sub

        Public Function Connect(ByVal s As Socket) As SSL
            Dim client_fd As Integer = s.Handle.ToInt32()
            Return New SSL(axtls.ssl_server_new(m_ctx, client_fd))
        End Function
    End Class

    Public Class SSLClient 
            Inherits SSLCTX

        Public Sub New(ByVal options As Integer, _
                ByVal num_sessions As Integer)
            MyBase.New(options, num_sessions)
        End Sub

        Public Function Connect(ByVal s As Socket, _
                                ByVal session_id As Byte()) As SSL
            Dim client_fd As Integer = s.Handle.ToInt32()
            Return New SSL( axtls.ssl_client_new(m_ctx, client_fd, session_id))
        End Function

    End Class
End Namespace