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88 lines
1.5 KiB
88 lines
1.5 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::SHA qw (sha512);
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sub module_constraints { [[0, 256], [16, 16], [-1, -1], [-1, -1], [-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 $default_salt = shift // 0;
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my $iterations = 65536;
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if ($default_salt == 1)
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{
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$salt = "0011223344556677";
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}
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my $digest = sha512 (pack ("H*", $salt) . $word);
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for (my $i = 0; $i < $iterations; $i++)
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{
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$digest = sha512 ($digest);
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}
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$digest = unpack ("H*", $digest);
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$digest = substr ($digest, 0, 16);
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my $hash;
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if ($default_salt == 0)
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{
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$hash = sprintf ("\$ecryptfs\$0\$1\$%s\$%s", $salt, $digest);
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}
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else
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{
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$hash = sprintf ("\$ecryptfs\$0\$%s", $digest);
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}
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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 $signature = substr ($hash_in, 0, 12);
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return unless ($signature eq '$ecryptfs$0$');
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my $digest = substr ($hash_in, 12);
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my $default_salt = 1;
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my ($param, $hash) = split ('\$', $digest);
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$default_salt = 0 if ($param eq '1');
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my $salt;
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if ($default_salt == 0)
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{
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($salt, $hash) = split ('\$', $hash);
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}
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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, $default_salt);
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return ($new_hash, $word);
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}
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1;
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