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#!/usr/bin/perl -w
#
# Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
# Written by David Howells (dhowells@redhat.com)
#
# This file 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 of the License, or
# (at your option) any later version.
#
# This file 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
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this file; if not, write to the Free Software Foundation,
# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#
# Generate random but valid ASN.1 data.
#
# Format:
#
# asn1random.pl >output
#
use strict;
my $depth = 0;
my $maxdepth = 12;
#print STDERR "SEED: ", srand(), "\n";
###############################################################################
#
# Generate a header
#
###############################################################################
sub emit_asn1_hdr($$)
{
my ($tag, $len) = @_;
my $output = "";
my $l;
if ($len < 0x80) {
$l = $len;
} elsif ($len <= 0xff) {
$l = 0x81;
} elsif ($len <= 0xffff) {
$l = 0x82;
} elsif ($len <= 0xffffff) {
$l = 0x83;
} else {
$l = 0x84;
}
# autogenerate tag, if it is not passed
if ($tag == -1) { $tag = int(rand(255)) & ~0x20; }
# don't emit tag numbers >= 31 (X.690-0207 -- 8.1.2.4)
if (($tag & 0x1f) == 0x1f) { $tag &= ~1; }
$output .= pack("CC", $tag, $l);
if ($len < 0x80) {
} elsif ($len <= 0xff) {
$output .= pack("C", $len);
} elsif ($len <= 0xffff) {
$output .= pack("n", $len);
} elsif ($len <= 0xffffff) {
$output .= pack("Cn", $len >> 16, $len & 0xffff);
} else {
$output .= pack("N", $len);
}
return $output;
}
###############################################################################
#
# Generate a random primitive
#
###############################################################################
sub emit_asn1_prim($)
{
my ($tag) = @_;
my $output;
my $len = int(rand(255));
$tag = int(rand(255)) & ~0x20
if ($tag == -1);
$output = emit_asn1_hdr($tag, $len);
my $i = $len;
while ($i > 16) {
$output .= "abcdefghijklmnop";
$i -= 16;
}
$output .= substr("abcdefghijklmnop", 0, $i);
return $output;
}
###############################################################################
#
# Generate a random construct
#
###############################################################################
sub emit_asn1_cons($);
sub emit_asn1_cons($)
{
my $output = "";
my $count = int(rand(20));
my ($tag) = @_;
if ($depth >= $maxdepth) {
return emit_asn1_prim($tag);
}
if ($tag == -1) {
$tag = int(rand(255)) & ~0x20;
if ($tag < 0x40 && $tag != 0x11) {
$tag = 0x10;
}
$tag |= 0x20;
}
$depth++;
while ($count > 0) {
if (int(rand(4 + $depth)) == 1) {
$output .= emit_asn1_cons(-1);
} else {
$output .= emit_asn1_prim(-1);
}
$count--;
}
$depth--;
return emit_asn1_hdr($tag, length($output)) . $output;
}
print emit_asn1_cons(-1);
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