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working unit test for m25400
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tools/test_modules/m25400.pm
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277
tools/test_modules/m25400.pm
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#!/usr/bin/env perl
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##
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## Author......: See docs/credits.txt
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## License.....: MIT
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##
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# based off m10500 but added the owner password part ($o) to be able to test the edit password
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# two TODOs still (now only works if no user password is set):
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# 1. TODO use user password as input for md5 of o_digest if no owner password is set
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# 2. TODO dynamically add user password including padding to the RC4 input for the computation of the pdf o-value
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# easy test shortcut for debugging
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# a=$(echo 1 | tools/test.pl passthrough 10500 | tail -n1); echo $a; echo 1 | ./hashcat --potfile-disable --runtime 400 --hwmon-disable -O -D 2 --backend-vector-width 4 -a 0 -m 10500 $a
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use strict;
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use warnings;
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use Crypt::RC4;
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use Digest::MD5 qw (md5);
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my $PDF_PADDING =
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[
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0x28, 0xbf, 0x4e, 0x5e, 0x4e, 0x75, 0x8a, 0x41, 0x64, 0x00, 0x4e, 0x56,
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0xff, 0xfa, 0x01, 0x08, 0x2e, 0x2e, 0x00, 0xb6, 0xd0, 0x68, 0x3e, 0x80,
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0x2f, 0x0c, 0xa9, 0xfe, 0x64, 0x53, 0x69, 0x7a
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];
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sub module_constraints { [[0, 15], [32, 32], [-1, -1], [-1, -1], [-1, -1]] }
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sub pdf_compute_encryption_key_user
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{
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my $word = shift;
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my $padding = shift;
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my $id = shift;
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my $u = shift;
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my $o = shift;
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my $P = shift;
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my $V = shift;
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my $R = shift;
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my $enc = shift;
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## start
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my $data;
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$data .= $word;
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$data .= substr ($padding, 0, 32 - length $word);
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$data .= pack ("H*", $o);
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$data .= pack ("I", $P);
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$data .= pack ("H*", $id);
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if ($R >= 4)
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{
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if (!$enc)
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{
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$data .= pack ("I", -1);
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}
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}
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my $res = md5 ($data);
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if ($R >= 3)
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{
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for (my $i = 0; $i < 50; $i++)
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{
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$res = md5 ($res);
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}
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}
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return $res;
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}
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sub pdf_compute_encryption_key_owner
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{
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my $word = shift;
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my $padding = shift;
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my $id = shift;
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my $u = shift;
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my $o = shift;
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my $P = shift;
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my $V = shift;
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my $R = shift;
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my $enc = shift;
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# TODO use user password as input for md5 of o_digest if no owner password is set
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my $data;
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$data .= $word;
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$data .= substr ($padding, 0, 32 - length $word);
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my $o_digest = md5 ($data);
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if ($R >= 3)
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{
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for (my $i = 0; $i < 50; $i++)
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{
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$o_digest = md5 ($o_digest);
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}
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}
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#printf("\$o_digest = %s\n", unpack ("H*", $o_digest));
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my $o_key;
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if ($R == 2)
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{
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$o_key = substr($o_digest, 0, 8); # rc4 key is always 5 for revision 2, but for 3 or greather is dependent on the value of the encryption dictionaries length entry
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}
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else
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{
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$o_key = substr($o_digest, 0, 16); #length is always 128 bits or 16 bytes
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}
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#printf("\$o_key = %s\n", unpack ("H*", $o_key));
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return $o_key;
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}
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sub module_generate_hash
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{
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my $word = shift;
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my $id = shift;
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my $u = shift;
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my $o = shift;
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my $P = shift;
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my $V = shift;
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my $R = shift;
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my $enc = shift;
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if (defined $u == 0)
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{
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$u = "0" x 64;
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}
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my $u_save = $u;
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if (defined $o == 0)
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{
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$o = "0" x 64;
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}
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my $o_save = $u;
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if (defined $R == 0)
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{
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$R = random_number (3, 4);
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}
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if (defined $V == 0)
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{
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$V = ($R == 3) ? 2 : 4;
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}
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if (defined $P == 0)
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{
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$P = ($R == 3) ? -4 : -1028;
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}
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if (defined $enc == 0)
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{
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$enc = ($R == 3) ? 1 : random_number (0, 1);
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}
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my $padding;
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for (my $i = 0; $i < 32; $i++)
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{
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$padding .= pack ("C", $PDF_PADDING->[$i]);
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}
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################ USER PASSWORD #################
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my $res = pdf_compute_encryption_key_user($word, $padding, $id, $u, $o, $P, $V, $R, $enc);
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my $digest = md5 ($padding . pack ("H*", $id));
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my $m = Crypt::RC4->new ($res);
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$u = $m->RC4 ($digest);
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my @ress = split "", $res;
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#do xor of rc4 19 times
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for (my $x = 1; $x <= 19; $x++)
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{
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my @xor;
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for (my $i = 0; $i < 16; $i++)
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{
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$xor[$i] = chr (ord ($ress[$i]) ^ $x);
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}
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my $s = join ("", @xor);
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my $m2 = Crypt::RC4->new ($s);
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$u = $m2->RC4 ($u);
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}
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################ OWNER PASSWORD #################
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my $o_key = pdf_compute_encryption_key_owner($word, $padding, $id, $u, $o, $P, $V, $R, $enc);
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my $n = Crypt::RC4->new ($o_key);
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$o = $n->RC4(substr ($padding, 0, 32 - length "")); # TODO dynamically add user password including padding to the RC4 input for the computation of the pdf o-value
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#printf("padding_empty_str = %s\n", unpack ("H*", substr ($padding, 0, 32 - length "")));
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my @ress2 = split "", $o_key;
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if ($R >= 3)
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{
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#do xor of rc4 19 times
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for (my $x = 1; $x <= 19; $x++)
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{
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my @xor;
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for (my $i = 0; $i < 16; $i++)
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{
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$xor[$i] = chr (ord ($ress2[$i]) ^ $x);
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}
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my $s = join ("", @xor);
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my $n2 = Crypt::RC4->new ($s);
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$o = $n2->RC4 ($o);
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}
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}
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#printf("\$u = %s\n", unpack ("H*", $u));
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$u .= substr (pack ("H*", $u_save), 16, 16);
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#printf("\$o = %s\n", unpack ("H*", $o));
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#printf("\$u = %s\n", unpack ("H*", $u));
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my $hash = sprintf ('$pdf$%d*%d*128*%d*%d*16*%s*32*%s*32*%s', $V, $R, $P, $enc, $id, unpack ("H*", $u), unpack ("H*", $o));
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return $hash;
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}
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sub module_verify_hash
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{
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my $line = shift;
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my ($hash_in, $word) = split ":", $line;
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return unless defined $hash_in;
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return unless defined $word;
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my @data = split /\*/, $hash_in;
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return unless scalar @data == 11;
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my $V = shift @data; $V = substr ($V, 5, 1);
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my $R = shift @data;
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return unless (shift @data eq '128'); # length is always 128 here
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my $P = shift @data;
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my $enc = shift @data;
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return unless (shift @data eq '16');
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my $id = shift @data;
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return unless (shift @data eq '32');
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my $u = shift @data;
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return unless (shift @data eq '32');
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my $o = shift @data;
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return unless defined $id;
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return unless defined $word;
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$word = pack_if_HEX_notation ($word);
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my $new_hash = module_generate_hash ($word, $id, $u, $o, $P, $V, $R, $enc);
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return ($new_hash, $word);
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}
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1;
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