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303 lines
6.7 KiB
Perl
303 lines
6.7 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::Mode::ECB;
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use Encode;
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sub module_constraints { [[4, 256], [16, 16], [-1, -1], [-1, -1], [-1, -1]] }
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my $ITER = 1048576; # 0x100000
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my $SALT_LEN = 16;
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my $IV_LEN = 12;
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my $MAC_LEN = 16;
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my $VMK_LEN = 44; # note: MAC_LEN + VMK_LEN = 60
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sub bitlocker_kdf
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{
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my $initial_hash = shift;
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my $salt = shift;
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# password_key_data (88 bytes):
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# 0-31 (32): last_hash
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# 32-63 (32): init_hash
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# 64-79 (16): salt
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# 80-87 ( 8): iter
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my $password_key_data = "\x00" x (32 + 32 + 16 + 8);
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substr ($password_key_data, 32, 32) = $initial_hash;
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substr ($password_key_data, 64, 16) = $salt;
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for (my $iter = 0; $iter < 0x100000; $iter++)
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{
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substr ($password_key_data, 80, 8) = pack ("Q", $iter);
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substr ($password_key_data, 0, 32) = sha256 ($password_key_data);
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}
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return substr ($password_key_data, 0, 32); # AES-CCM key
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}
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# non-standard/variant of AES-CCM (encrypt or decrypt, both => crypt):
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sub bitlocker_crypt_data
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{
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my $key = shift;
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my $data = shift;
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my $iv = shift;
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my $ret = ""; # return value (output buffer)
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my $iiv = "\x02"; # 15 - length ($iv) - 1 = 14 - length ($iv)
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$iiv = $iiv . $iv . "\x00\x00\x00"; # add "\x00" x (16 - length ($iv))
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# we could do this in a loop (but let's unroll it to make it clear what is going on):
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# (first and last are special)
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# 0
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# substr ($iiv, 15, 1) = "\x00";
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my $aes = Crypt::Mode::ECB->new ('AES', 0);
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my $block = $aes->encrypt ($iiv, $key);
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for (my $i = 0; $i < 16; $i++)
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{
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$ret .= chr (ord (substr ($data, $i, 1)) ^ ord (substr ($block, $i, 1)));
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}
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# 1
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substr ($iiv, 15, 1) = "\x01";
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$block = $aes->encrypt ($iiv, $key);
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for (my $i = 0; $i < 16; $i++)
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{
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$ret .= chr (ord (substr ($data, 16 + $i, 1)) ^ ord (substr ($block, $i, 1)));
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}
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# 2
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substr ($iiv, 15, 1) = "\x02";
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$block = $aes->encrypt ($iiv, $key);
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for (my $i = 0; $i < 16; $i++)
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{
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$ret .= chr (ord (substr ($data, 32 + $i, 1)) ^ ord (substr ($block, $i, 1)));
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}
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# 3 (final/remaining data: 12 bytes):
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substr ($iiv, 15, 1) = "\x03";
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$block = $aes->encrypt ($iiv, $key);
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for (my $i = 0; $i < 12; $i++)
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{
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$ret .= chr (ord (substr ($data, 48 + $i, 1)) ^ ord (substr ($block, $i, 1)));
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}
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return $ret;
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}
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sub bitlocker_generate_mac
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{
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my $key = shift;
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my $data = shift;
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my $iv = shift;
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my $iiv = "\x3a" . $iv . "\x00\x00" . "\x2c";
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# we could do this in a loop (but let's unroll it to make it clear what is going on):
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# (first and last are special)
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# 0
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my $aes = Crypt::Mode::ECB->new ('AES', 0);
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my $block = $aes->encrypt ($iiv, $key);
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my $res = "";
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for (my $i = 0; $i < 16; $i++)
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{
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$res .= chr (ord (substr ($data, $i, 1)) ^ ord (substr ($block, $i, 1)));
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}
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# 1
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$block = $aes->encrypt ($res, $key);
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$res = "";
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for (my $i = 0; $i < 16; $i++)
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{
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$res .= chr (ord (substr ($data, 16 + $i, 1)) ^ ord (substr ($block, $i, 1)));
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}
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# 2
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$block = $aes->encrypt ($res, $key);
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$res = "";
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for (my $i = 0; $i < 12; $i++)
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{
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$res .= chr (ord (substr ($data, 32 + $i, 1)) ^ ord (substr ($block, $i, 1)));
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}
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# 3
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$block = $aes->encrypt ($res . substr ($block, 12, 4), $key);
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return $block;
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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 $salt = shift;
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my $iv = shift // random_bytes (12);
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my $data = shift; # if not set, we're going to "generate"/fake it below
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my $type = shift // random_number (0, 1); # if set to 1: check also the MAC in hashcat
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# key generation (KDF):
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my $word_utf16le = encode ("UTF-16LE", $word);
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my $pass_hash = sha256 (sha256 ($word_utf16le));
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my $key = bitlocker_kdf ($pass_hash, $salt);
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if (! $data)
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{
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$data = pack ("H*", "2c000000"); # actually, only 0x2c00 can be expected for sure
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$data .= pack ("H*", "01000000"); # actually, only 0x0100 can be expected for sure
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$data .= chr (random_number (0, 5));
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$data .= pack ("H*", "200000"); # actually, only 0x20 can be expected for sure
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$data .= random_bytes (44 - 12); # 44 - bytes that we set above
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}
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else
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{
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# verification:
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my $dec_data = bitlocker_crypt_data ($key, $data, $iv); # decryption
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my $data_size = ord (substr ($dec_data, 16, 1)) | (ord (substr ($dec_data, 17, 1)) << 8);
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my $version = ord (substr ($dec_data, 20, 1)) | (ord (substr ($dec_data, 21, 1)) << 8);
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my $v1 = ord (substr ($dec_data, 16 + 8, 1)); # Volume Master Key (VMK) + 8
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my $v2 = ord (substr ($dec_data, 16 + 9, 1)); # Volume Master Key (VMK) + 9
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# early ejects / failed:
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return unless ($data_size == 0x2c);
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return unless ($version == 0x01);
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return unless ($v2 == 0x20);
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return unless ($v1 <= 0x05);
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$data = substr ($dec_data, 16); # skip the MAC such that we get only the raw data (VMK etc)
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# note: we do NOT check the $type value ... we do the MAC verification anyway to be safe
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# (for "verify" and $type set to 0 - no MAC verification -, we could early exit here already)
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}
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# MAC (authenticate-then-encrypt, MAC first!):
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my $mac = bitlocker_generate_mac ($key, $data, $iv);
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# encrypt (both, MAC + VMK):
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my $mac_vmk = $mac . $data;
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my $enc_data = bitlocker_crypt_data ($key, $mac_vmk, $iv); # encryption
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# output:
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my $hash = sprintf ("\$bitlocker\$%i\$%i\$%s\$%i\$%i\$%s\$%i\$%s",
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$type,
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$SALT_LEN,
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unpack ("H*", $salt),
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$ITER,
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$IV_LEN,
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unpack ("H*", $iv),
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$MAC_LEN + $VMK_LEN,
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unpack ("H*", $enc_data));
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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 if ($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 defined $hash;
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return unless defined $word;
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my @data = split ('\$', $hash);
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return unless (scalar (@data) == 10);
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my $signature = $data[1];
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my $type = $data[2];
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my $salt_len = $data[3];
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my $salt = $data[4];
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my $iter = $data[5];
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my $iv_len = $data[6];
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my $iv = $data[7];
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my $data_len = $data[8];
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my $data = $data[9];
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# sanity checks:
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return unless ($signature eq "bitlocker");
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return unless ($salt_len == $SALT_LEN);
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return unless ($iv_len == $IV_LEN);
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return unless ($data_len == $MAC_LEN + $VMK_LEN);
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# hex to binary conversion:
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$salt = pack ("H*", $salt);
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$iv = pack ("H*", $iv);
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$data = pack ("H*", $data);
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return unless (length ($salt) == $SALT_LEN);
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return unless (length ($iv) == $IV_LEN);
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return unless (length ($data) == $MAC_LEN + $VMK_LEN);
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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, $iv, $data, $type);
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return ($new_hash, $word);
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}
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1;
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