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76 lines
2.1 KiB
Perl
Executable File
76 lines
2.1 KiB
Perl
Executable File
#!/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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# In a first version I wrote a kernel that followed the original sqlcipher scheme which uses a MAC to verify the integrity (and therefore we knew we had guessed the correct password).
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# But it turns out it's much easier to exploit the sqlite header format, which guarantees 20 zero bytes starting from offset 72.
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# See: https://www.sqlite.org/fileformat.html
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# The advantage is the user doesn't need to guess the MAC hash type and/or pagesize (in case it they customized).
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# The user still needs to know the KDF hash type and iteration count, but they sqlcipher v3 and v4 come with a default for these.
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# We'll check only 12 of 16 bytes from the encrypted block as an optimization so we only need to decrypt one block.
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# Another optimization is that since the scheme uses CBC we do not need to find the correct position of the IV.
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# This position is depending on the pagesize and the KDF hash type (which could be customized).
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# As an alternative, or in case the sqlite header changes, we could also use entropy test.
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# -atom
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use strict;
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use warnings;
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if (scalar (@ARGV) < 2)
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{
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print "usage: $0 encrypted.db preset [hash] [iteration]\n\n";
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print "preset 1 = SQLCIPHER v3\n";
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print "preset 2 = SQLCIPHER v4\n";
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print "preset 3 = CUSTOM, please specify hash type (1 = SHA1, 2 = SHA256, 3 = SHA512) and iteration count\n";
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exit -1;
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}
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my $db = $ARGV[0];
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my $preset = $ARGV[1];
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my $type = 0;
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my $iter = 0;
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if ($preset == 1)
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{
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$type = 1;
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$iter = 64000;
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}
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elsif ($preset == 2)
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{
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$type = 3;
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$iter = 256000;
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}
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elsif ($preset == 3)
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{
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$type = $ARGV[2];
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$iter = $ARGV[3];
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}
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else
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{
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die "Invalid preset\n";
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}
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open (IN, $db) or die ("$db: $!\n");
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binmode (IN);
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my $data;
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if (read (IN, $data, 96) != 96)
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{
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die "ERROR: Couldn't read data from the file. Maybe incorrect file format?\n";
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}
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close (IN);
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my $salt = substr ($data, 0, 16);
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my $iv = substr ($data, 64, 16);
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my $enc = substr ($data, 80, 16);
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printf ("SQLCIPHER*%d*%d*%s*%s*%s\n", $type, $iter, unpack ("H*", $salt), unpack ("H*", $iv), unpack ("H*", $enc));
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