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176 lines
3.8 KiB
176 lines
3.8 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 Crypt::PBKDF2;
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use MIME::Base64 qw (encode_base64 decode_base64);
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use Encode;
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sub module_constraints { [[0, 256], [128, 128], [-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 $data = shift // "";
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my $iter = 1000;
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my $pbkdf2 = Crypt::PBKDF2->new
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(
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hasher => Crypt::PBKDF2->hasher_from_algorithm ('HMACSHA2', 512),
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iterations => $iter
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);
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my $word_utf16le = encode ("UTF-16LE", $word);
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my $salt_bin = pack ("H*", $salt);
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my $key = $pbkdf2->PBKDF2 ($salt_bin, $word_utf16le);
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my $key_main = encode_base64 (substr ($key, 0, 32), "");
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my $key_tweak = encode_base64 (substr ($key, 32, 32), "");
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my $diskcryptor_data = "";
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$diskcryptor_data .= $salt_bin;
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if (length ($data) == 0) # normal case
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{
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$diskcryptor_data .= "DCRP";
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$diskcryptor_data .= random_bytes (4);
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$diskcryptor_data .= (int (rand (2)) == 1) ? pack ("H*", "02000400") : pack ("H*", "02000500");
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$diskcryptor_data .= "\x00" x (2048 - length ($diskcryptor_data)); # fill it up to 2048 bytes
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}
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else # verify
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{
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# extract the data from the function parameter
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my $data_base64 = encode_base64 (pack ("H*", $data), "");
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# attention: this is the decryption (further down we have the reverse: encryption)
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my $python_code = <<'END_CODE';
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from CryptoPlus.Cipher import AES
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import base64
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aes_key1 = base64.b64decode (key_main)
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aes_key2 = base64.b64decode (key_tweak)
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xts_key = (aes_key1, aes_key2)
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cipher = AES.new (xts_key, AES.MODE_XTS)
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sequence = "01".decode ("hex")
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data_decrypted = cipher.decrypt (base64.b64decode (diskcryptor_data), sequence)
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print data_decrypted.encode ("hex")
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END_CODE
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# replace code with these values
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$python_code =~ s/key_main/"$key_main"/;
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$python_code =~ s/key_tweak/"$key_tweak"/;
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$python_code =~ s/diskcryptor_data/"$data_base64"/;
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my $output_buf = `python2 -c '$python_code'`;
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$output_buf =~ s/[\r\n]//g;
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$output_buf = substr ($output_buf, 128); # remove the "garbage" from the start (encrypted salt)
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$output_buf = pack ("H*", $output_buf);
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$diskcryptor_data .= $output_buf;
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}
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$diskcryptor_data = encode_base64 ($diskcryptor_data, "");
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my $python_code = <<'END_CODE';
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from CryptoPlus.Cipher import AES
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import base64
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aes_key1 = base64.b64decode (key_main)
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aes_key2 = base64.b64decode (key_tweak)
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xts_key = (aes_key1, aes_key2)
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cipher = AES.new (xts_key, AES.MODE_XTS)
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sequence = "01".decode ("hex")
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data_encrypted = cipher.encrypt (base64.b64decode (diskcryptor_data), sequence)
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print data_encrypted.encode ("hex")
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END_CODE
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# replace code with these values
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$python_code =~ s/key_main/"$key_main"/;
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$python_code =~ s/key_tweak/"$key_tweak"/;
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$python_code =~ s/diskcryptor_data/"$diskcryptor_data"/;
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my $hash_buf = `python2 -c '$python_code'`;
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$hash_buf =~ s/[\r\n]//g;
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$hash_buf = substr ($hash_buf, 128); # remove the "garbage" from the start (encrypted salt)
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my $hash = sprintf ("\$diskcryptor\$0*%s%s", $salt, $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 $index1 = index ($line, ":");
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return if $index1 < 1;
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my $hash_in = substr ($line, 0, $index1);
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return unless (substr ($hash_in, 0, 13) eq "\$diskcryptor\$");
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my $word = substr ($line, $index1 + 1);
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my $index2 = index ($hash_in, "\*", 13);
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return if $index2 < 1;
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my $version = substr ($hash_in, 13, $index2 - 13);
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return unless ($version eq "0");
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my $data = substr ($hash_in, $index2 + 1);
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return unless (length ($data) == 4096);
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my $salt = substr ($data, 0, 128);
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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, $data);
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return ($new_hash, $word);
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}
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1;
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