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126 lines
2.3 KiB
Perl
126 lines
2.3 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::SHA qw (sha256);
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use Crypt::CBC;
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sub module_constraints { [[0, 56], [8, 8], [-1, -1], [-1, -1], [-1, -1]] }
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my $BUF_SIZE = 0x10000;
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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 $data = shift;
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my $comb = $salt . $word;
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my $len = length ($comb);
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my $buf = "";
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for (my $i = 0; $i < $BUF_SIZE; $i += $len)
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{
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$buf .= $comb;
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}
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# IMPORTANT: we need to truncate the buffer to $BUF_SIZE:
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$buf = substr ($buf, 0, $BUF_SIZE);
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my $key = sha256 ($buf);
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my $aes = Crypt::CBC->new ({
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cipher => "Crypt::Rijndael",
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key => $key,
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iv => "\x00" x 16,
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keysize => 32,
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literal_key => 1,
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header => "none",
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padding => "none"
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});
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if (defined ($data)) # decrypt
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{
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my $plain_text = $aes->decrypt ($data);
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my $part1 = substr ($plain_text, 0, 64);
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my $part2 = substr ($plain_text, 64, 32);
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my $hash = sha256 ($part1);
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if ($hash ne $part2) # wrong => fake the data
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{
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$data = "\x00" x length ($data); # 64 + 32 = 96
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}
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}
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else # encrypt
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{
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$data = random_bytes (64);
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my $hash = sha256 ($data);
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$data = $aes->encrypt ($data . $hash);
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}
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return sprintf ("\$bcve\$3\$08\$%s\$%s", unpack ("H*", $salt), unpack ("H*", $data));
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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 $idx1 = index ($line, ':');
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return if ($idx1 < 1);
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my $hash = substr ($line, 0, $idx1);
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my $word = substr ($line, $idx1 + 1);
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return if (substr ($hash, 0, 8) ne "\$bcve\$3\$");
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$idx1 = index ($hash, '$', 8);
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return if ($idx1 < 1);
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# crypto type
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my $crypto_type = substr ($hash, 8, $idx1 - 8);
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return unless ($crypto_type eq "08");
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# salt
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my $idx2 = index ($hash, '$', $idx1 + 1);
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my $salt = substr ($hash, $idx1 + 1, $idx2 - $idx1 - 1);
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return unless ($salt =~ m/^[0-9a-fA-F]+$/);
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# data
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my $data = substr ($hash, $idx2 + 1);
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return unless ($data =~ m/^[0-9a-fA-F]+$/);
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# convert to hex:
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$salt = pack ("H*", $salt);
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$data = pack ("H*", $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, $data);
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return ($new_hash, $word);
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}
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1;
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