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83 lines
1.4 KiB
83 lines
1.4 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_hex);
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sub module_constraints { [[0, 256], [-1, -1], [0, 38], [-1, -1], [-1, -1]] } # 38 = 55 - 16 - 1
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sub get_random_md5chap_salt
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{
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my $salt_buf = random_bytes (16);
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my $salt = unpack ("H*", $salt_buf);
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$salt .= ":";
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$salt .= unpack ("H*", random_bytes (1));
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return $salt;
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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_random_md5chap_salt ();
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}
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my $index = rindex ($salt, ":");
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my $saltx = substr ($salt, 0, $index);
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my $salt_bin = pack ("H*", $saltx);
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my $chap_sign = substr ($salt, $index + 1);
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my $chap_sign_bin = pack ("H*", $chap_sign);
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my $hash_buf = md5_hex ($chap_sign_bin . $word . $salt_bin);
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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 $index1 = index ($line, ":");
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return if $index1 < 1;
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my $index2 = index ($line, ":", $index1 + 1);
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return if $index2 < 1;
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my $index3 = index ($line, ":", $index2 + 1);
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return if $index3 < 1;
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my $salt = substr ($line, $index1 + 1, $index3 - $index1 - 1);
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my $word = substr ($line, $index3 + 1);
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return unless defined $salt;
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return unless defined $word;
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$word = pack_if_HEX_notation ($word);
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my $new_hash = module_generate_hash ($word, $salt);
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return ($new_hash, $word);
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}
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1;
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