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81 lines
1.6 KiB
Perl
81 lines
1.6 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 Crypt::PBKDF2;
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use MIME::Base64 qw (encode_base64 decode_base64);
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sub module_constraints { [[0, 256], [32, 32], [-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 $pbkdf2 = Crypt::PBKDF2->new
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(
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hasher => Crypt::PBKDF2->hasher_from_algorithm ('HMACSHA2', 256),
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iterations => 100000,
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);
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my $hash_buf = encode_base64 ($pbkdf2->PBKDF2 ($salt, $word), "");
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my $salt_buf = encode_base64 ($salt, "");
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# replace + with .
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$hash_buf =~ s/\+/\./g;
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$salt_buf =~ s/\+/\./g;
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# remove padding =
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$hash_buf =~ s/\=+$//;
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$salt_buf =~ s/\=+$//;
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my $hash = sprintf ('$pbkdf2-sha256$100000$%s$%s', $salt_buf, $hash_buf);
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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 $idx = index ($line, ':');
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return unless $idx >= 0;
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my $hash = substr ($line, 0, $idx);
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my $word = substr ($line, $idx + 1);
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return unless substr ($hash, 0, 22) eq '$pbkdf2-sha256$100000$';
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my (undef, $signature, $iter, $salt) = split '\$', $hash;
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return unless defined $signature;
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return unless defined $iter;
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return unless defined $salt;
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return unless $iter == 100000;
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return unless length $salt == 43;
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$salt =~ s/\./\+/g;
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$salt .= '==';
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my $salt_b64 = decode_base64 ($salt);
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return unless length $salt_b64 == 32;
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my $word_packed = pack_if_HEX_notation ($word);
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my $new_hash = module_generate_hash ($word_packed, $salt_b64);
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return ($new_hash, $word);
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}
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1;
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