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# Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
#
# Licensed under the OpenSSL license (the "License"). You may not use
# this file except in compliance with the License. You can obtain a copy
# in the file LICENSE in the source distribution or at
# https://www.openssl.org/source/license.html
use strict;
package TLSProxy::ServerKeyExchange;
use vars '@ISA';
push @ISA, 'TLSProxy::Message';
sub new
{
my $class = shift;
my ($server,
$data,
$records,
$startoffset,
$message_frag_lens) = @_;
my $self = $class->SUPER::new(
$server,
TLSProxy::Message::MT_SERVER_KEY_EXCHANGE,
$data,
$records,
$startoffset,
$message_frag_lens);
#DHE
$self->{p} = "";
$self->{g} = "";
$self->{pub_key} = "";
$self->{sig} = "";
return $self;
}
sub parse
{
my $self = shift;
#Minimal SKE parsing. Only supports DHE at the moment (if its not DHE
#the parsing data will be trash...which is ok as long as we don't try to
#use it)
my $p_len = unpack('n', $self->data);
my $ptr = 2;
my $p = substr($self->data, $ptr, $p_len);
$ptr += $p_len;
my $g_len = unpack('n', substr($self->data, $ptr));
$ptr += 2;
my $g = substr($self->data, $ptr, $g_len);
$ptr += $g_len;
my $pub_key_len = unpack('n', substr($self->data, $ptr));
$ptr += 2;
my $pub_key = substr($self->data, $ptr, $pub_key_len);
$ptr += $pub_key_len;
#We assume its signed
my $sig_len = unpack('n', substr($self->data, $ptr));
my $sig = "";
if (defined $sig_len) {
$ptr += 2;
$sig = substr($self->data, $ptr, $sig_len);
$ptr += $sig_len;
}
$self->p($p);
$self->g($g);
$self->pub_key($pub_key);
$self->sig($sig);
}
#Reconstruct the on-the-wire message data following changes
sub set_message_contents
{
my $self = shift;
my $data;
$data = pack('n', length($self->p));
$data .= $self->p;
$data .= pack('n', length($self->g));
$data .= $self->g;
$data .= pack('n', length($self->pub_key));
$data .= $self->pub_key;
if (length($self->sig) > 0) {
$data .= pack('n', length($self->sig));
$data .= $self->sig;
}
$self->data($data);
}
#Read/write accessors
#DHE
sub p
{
my $self = shift;
if (@_) {
$self->{p} = shift;
}
return $self->{p};
}
sub g
{
my $self = shift;
if (@_) {
$self->{g} = shift;
}
return $self->{g};
}
sub pub_key
{
my $self = shift;
if (@_) {
$self->{pub_key} = shift;
}
return $self->{pub_key};
}
sub sig
{
my $self = shift;
if (@_) {
$self->{sig} = shift;
}
return $self->{sig};
}
1;
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