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143 lines
3.1 KiB
Perl
143 lines
3.1 KiB
Perl
#!/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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use strict;
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use warnings;
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use Crypt::CBC;
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use Digest::SHA qw (sha256 sha384 sha512);
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sub module_constraints { [[1, 127], [32, 32], [1, 15], [32, 32], [-1, -1]] }
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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 $rest = shift;
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if (defined $id == 0)
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{
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$id = "0" x 32;
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}
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if (defined $rest == 0)
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{
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$rest = "127*";
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$rest .= "0" x 64;
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$rest .= $id;
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$rest .= "0" x 158;
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$rest .= "*127*00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000*32*0000000000000000000000000000000000000000000000000000000000000000*32*0000000000000000000000000000000000000000000000000000000000000000";
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}
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my @datax = split /\*/, $rest;
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my $u = pack ("H*", $datax[1]);
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my $block = sha256 ($word . substr ($u, 32, 8));
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my $block_size = 32;
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my $data = 0x00 x 64;
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my $data_len = 1;
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my $data63 = 0;
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for (my $i = 0; $i < 64 || $i < $data63 + 32; $i++)
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{
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$data = $word . $block;
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$data_len = length ($data);
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for (my $k = 1; $k < 64; $k++)
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{
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$data .= $word . $block;
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}
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my $aes = Crypt::CBC->new ({
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key => substr ($block, 0, 16),
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cipher => "Crypt::Rijndael",
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iv => substr ($block, 16, 16),
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literal_key => 1,
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header => "none",
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keysize => 16,
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padding => "none",
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});
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my $data = $aes->encrypt ($data);
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my $sum = 0;
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for (my $j = 0; $j < 16; $j++)
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{
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$sum += ord (substr ($data, $j, 1));
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}
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$block_size = 32 + ($sum % 3) * 16;
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if ($block_size == 32)
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{
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$block = sha256 (substr ($data, 0, $data_len * 64));
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}
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elsif ($block_size == 48)
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{
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$block = sha384 (substr ($data, 0, $data_len * 64));
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}
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elsif ($block_size == 64)
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{
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$block = sha512 (substr ($data, 0, $data_len * 64));
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}
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$data63 = ord (substr ($data, $data_len * 64 - 1, 1));
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}
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$datax[1] = unpack ("H*", substr ($block, 0, 32) . substr ($u, 32));
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$rest = join ("*", @datax);
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my $hash = sprintf ('$pdf$5*6*256*-1028*1*16*%s*%s', $id, $rest);
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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 $line = shift;
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# PDF 1.7 Level 8 (Acrobat 10 - 11)
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my ($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 /\*/, $hash_in;
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return unless scalar @data >= 11;
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return unless (shift @data eq '$pdf$5');
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return unless (shift @data eq '6');
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return unless (shift @data eq '256');
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return unless (shift @data eq '-1028');
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return unless (shift @data eq '1');
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return unless (shift @data eq '16');
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my $id = shift @data;
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my $rest = join "*", @data;
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return unless defined $id;
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return unless defined $rest;
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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, $rest);
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return ($new_hash, $word);
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}
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1;
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