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64 lines
1.1 KiB
64 lines
1.1 KiB
#!/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 Digest::MD5 qw (md5);
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use POSIX qw (ceil);
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sub module_constraints { [[-1, -1], [-1, -1], [1, 31], [-1, -1], [-1, -1]] }
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sub pseudo_base64
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{
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my $itoa64 = "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
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my $md5 = shift;
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my $s64 = "";
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for my $i (0..3) {
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my $v = unpack "V", substr ($md5, $i*4, 4);
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for (1..4) {
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$s64 .= substr ($itoa64, $v & 0x3f, 1);
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$v >>= 6;
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}
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}
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return $s64;
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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 $word_len = length ($word);
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my $pad_len = ceil ($word_len / 16) * 16;
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my $digest = md5 ($word . "\0" x ($pad_len - $word_len));
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my $hash = sprintf ("%s", pseudo_base64 ($digest));
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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, $word) = split (':', $line);
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return unless defined $hash;
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return unless defined $word;
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my $word_packed = pack_if_HEX_notation ($word);
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my $new_hash = module_generate_hash ($word_packed);
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return ($new_hash, $word);
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}
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1;
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