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63 lines
1.1 KiB
Perl
63 lines
1.1 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 Digest::SHA qw (sha1_hex);
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use Encode;
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sub module_constraints { [[0, 256], [-1, -1], [0, 16], [-1, -1], [-1, -1]] }
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sub get_pstoken_salt
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{
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my $pstoken_length = random_number (16, 255);
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## not a valid pstoken but a better test
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## because of random length
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my $pstoken_const = random_bytes ($pstoken_length);
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return unpack ("H*", $pstoken_const);
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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 $salt = shift;
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if (length $salt == 0)
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{
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$salt = get_pstoken_salt ();
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}
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my $hash_buf = sha1_hex (pack ("H*", $salt) . encode ("UTF-16LE", $word));
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my $hash = sprintf ("%s:%s", $hash_buf, $salt);
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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, $salt, $word) = split (':', $line);
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return unless defined $hash;
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return unless defined $salt;
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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, $salt);
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return ($new_hash, $word);
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}
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1;
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