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59 lines
1.1 KiB
Perl
59 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::MD5 qw (md5);
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use Digest::HMAC qw (hmac_hex);
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sub module_constraints { [[0, 256], [116, 148], [0, 55], [0, 31], [-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 $salt = shift;
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my $salt_len = length ($salt);
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if ($salt_len < 32) # we don't support salt length > 55 in optimized mode, but this mode requires it
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{
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$salt .= "0" x 116;
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$salt_len += 116;
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}
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$salt = substr ($salt, 0, $salt_len % 2 ? $salt_len - 1 : $salt_len);
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my $salt_bin = pack ("H*", $salt);
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my $digest = hmac_hex ($salt_bin, $word, \&md5, 64);
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my $hash = sprintf ("%s:%s", $digest, $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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