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99 lines
2.3 KiB
Perl
99 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_hex);
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use Crypt::CBC;
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sub module_constraints { [[0, 55], [-1, -1], [0, 55], [-1, -1], [-1, -1]] }
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sub calculate_padding
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{
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my $length = shift;
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my $blocksize = shift // 32;
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my $minpadding = shift // 16;
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my $padded_len = $length+$minpadding;
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my $finalpadded = (($padded_len - 1) | ($blocksize - 1)) + 1;
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return $finalpadded - $length;
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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 $total_len = (length ($word) * 2) + 8 + 64;
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my $padding = shift // random_hex_string (calculate_padding ($total_len));
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if (length $padding == 0) {
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$padding = random_hex_string (calculate_padding ($total_len));
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}
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my $digest = sha256_hex ($word);
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my $len = sprintf ("%02d", length ($word));
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my $paddedlen = sprintf ("%02x000000", $len);
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my $hexofword = unpack "H*", $word;
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my $plaintext = $paddedlen . $hexofword . $digest . $padding;
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my $aes = Crypt::CBC->new ({
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key => pack ("H*", $digest),
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cipher => "Crypt::Rijndael",
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iv => => "\x00" x 16,
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literal_key => 1,
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header => "none",
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keysize => 32,
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padding => "none",
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});
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my $ciphertext = $aes->encrypt (pack ("H*", $plaintext));
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my $hash = sprintf ("S:\"Config Passphrase\"=02:%s", unpack ("H*", $ciphertext));
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return $hash
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}
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sub get_aes
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{
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my $word_packed = shift;
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my $key = sha256_hex ($word_packed);
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my $aes = Crypt::CBC->new ({
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key => pack ("H*", $key),
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cipher => "Crypt::Rijndael",
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iv => => "\x00" x 16,
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literal_key => 1,
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header => "none",
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keysize => 32,
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padding => "none",
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});
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return $aes
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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) = $line=~ /S:.Config.Passphrase.=02:(.*):(.*)/;
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return unless defined $hash;
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return unless defined $word;
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my $word_packed = pack_if_HEX_notation ($word);
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my $decrypted = get_aes ($word_packed)->decrypt (pack"H*", $hash);
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my $plaintext_hex = unpack "H*", $decrypted;
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my $passlen = hex (substr ($plaintext_hex, 0, 2));
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my $padding = substr ($plaintext_hex, 8 + 2 * $passlen + 64);
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my $new_hash = module_generate_hash ($word_packed,$padding);
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return ($new_hash, $word);
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}
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1;
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