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106 lines
2.8 KiB
106 lines
2.8 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 (sha1);
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use Digest::HMAC qw (hmac);
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sub module_constraints { [[0, 256], [8, 8], [0, 55], [8, 8], [-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 $iterations = shift // 20000;
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my $additional_param = shift;
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my $pbkdf1_salt = sprintf ('%s$sha1$%u', $salt, $iterations);
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my $tmp = hmac ($pbkdf1_salt, $word, \&sha1, 64);
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for (my $r = 1; $r < $iterations; $r++)
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{
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$tmp = hmac ($tmp, $word, \&sha1, 64);
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}
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my $digest = "";
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$digest .= to64 ((int (ord (substr ($tmp, 0, 1))) << 16) | (int (ord (substr ($tmp, 1, 1))) << 8) | (int (ord (substr ($tmp, 2, 1)))), 4);
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$digest .= to64 ((int (ord (substr ($tmp, 3, 1))) << 16) | (int (ord (substr ($tmp, 4, 1))) << 8) | (int (ord (substr ($tmp, 5, 1)))), 4);
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$digest .= to64 ((int (ord (substr ($tmp, 6, 1))) << 16) | (int (ord (substr ($tmp, 7, 1))) << 8) | (int (ord (substr ($tmp, 8, 1)))), 4);
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$digest .= to64 ((int (ord (substr ($tmp, 9, 1))) << 16) | (int (ord (substr ($tmp, 10, 1))) << 8) | (int (ord (substr ($tmp, 11, 1)))), 4);
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$digest .= to64 ((int (ord (substr ($tmp, 12, 1))) << 16) | (int (ord (substr ($tmp, 13, 1))) << 8) | (int (ord (substr ($tmp, 14, 1)))), 4);
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$digest .= to64 ((int (ord (substr ($tmp, 15, 1))) << 16) | (int (ord (substr ($tmp, 16, 1))) << 8) | (int (ord (substr ($tmp, 17, 1)))), 4);
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$digest .= to64 ((int (ord (substr ($tmp, 18, 1))) << 16) | (int (ord (substr ($tmp, 19, 1))) << 8) | 0 , 4);
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## super hackish, but we have no other choice, as this byte is kind of a random byte added to the digest when the hash was created
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if (defined $additional_param)
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{
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$digest = substr ($digest, 0, 24) . substr ($additional_param, 24, 4);
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}
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my $hash = sprintf ("\$sha1\$%d\$%s\$%s", $iterations, $salt, $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 @data = split ('\$', $hash);
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return unless scalar @data == 5;
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shift @data;
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my $signature = shift @data;
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return unless ($signature eq 'sha1');
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my $iterations = shift @data;
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my $salt = shift @data;
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my $additional_param = shift @data;
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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, $iterations, $additional_param);
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return ($new_hash, $word);
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}
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sub to64
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{
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my $v = shift;
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my $n = shift;
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my $itoa64 = "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
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my $ret = "";
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while (($n - 1) >= 0)
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{
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$n = $n - 1;
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$ret .= substr ($itoa64, $v & 0x3f, 1);
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$v = $v >> 6;
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}
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return $ret
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}
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1;
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