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