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102 lines
2.2 KiB
Perl
102 lines
2.2 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, 256], [-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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