mirror of
https://github.com/hashcat/hashcat.git
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427 lines
9.6 KiB
Perl
427 lines
9.6 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 Crypt::CBC;
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use Crypt::Mode::ECB;
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use Digest::SHA qw (sha256);
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sub module_constraints { [[0, 256], [-1, -1], [-1, -1], [-1, -1], [-1, -1]] }
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sub get_random_keepass_salt
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{
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my $version = random_number (1, 2);
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my $algorithm;
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my $iteration;
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my $final_random_seed;
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if ($version == 1)
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{
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$algorithm = random_number (0, 1);
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$iteration = random_number (50000, 99999);
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$final_random_seed = random_bytes (16);
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$final_random_seed = unpack ("H*", $final_random_seed);
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}
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elsif ($version == 2)
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{
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$algorithm = 0;
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$iteration = random_number (6000, 99999);
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$final_random_seed = random_bytes (32);
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$final_random_seed = unpack ("H*", $final_random_seed);
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}
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my $transf_random_seed = random_bytes (32);
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$transf_random_seed = unpack ("H*", $transf_random_seed);
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my $enc_iv = random_bytes (16);
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$enc_iv = unpack ("H*", $enc_iv);
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my $contents_hash = random_bytes (32);
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$contents_hash = unpack ("H*", $contents_hash);
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my $inline_flag = 1;
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my $contents_len = random_number (128, 499);
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my $contents = random_bytes ($contents_len);
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$contents_len += 16 - $contents_len % 16;
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$contents = unpack ("H*", $contents);
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my $salt_buf;
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my $is_keyfile = random_number (0, 1);
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my $keyfile_attributes = "";
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if ($is_keyfile == 1)
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{
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$keyfile_attributes = $keyfile_attributes
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. "1*64*"
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. unpack ("H*", random_bytes (32));
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}
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if ($version == 1)
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{
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$salt_buf = $version . '*' .
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$iteration . '*' .
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$algorithm . '*' .
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$final_random_seed . '*' .
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$transf_random_seed . '*' .
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$enc_iv . '*' .
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$contents_hash . '*' .
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$inline_flag . '*' .
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$contents_len . '*' .
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$contents . '*' .
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$keyfile_attributes;
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}
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elsif ($version == 2)
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{
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$contents = random_bytes (32);
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$contents = unpack ("H*", $contents);
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$salt_buf = $version . '*' .
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$iteration . '*' .
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$algorithm . '*' .
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$final_random_seed . '*' .
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$transf_random_seed . '*' .
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$enc_iv . '*' .
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$contents_hash . '*' .
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$contents . '*' .
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$keyfile_attributes;
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}
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return $salt_buf;
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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 $param = shift;
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if (length $salt == 0)
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{
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$salt = get_random_keepass_salt ();
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}
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my @salt_arr = split ('\*', $salt);
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my $version = $salt_arr[0];
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my $iteration = $salt_arr[1];
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my $algorithm = $salt_arr[2];
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my $final_random_seed = $salt_arr[3];
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my $transf_random_seed = $salt_arr[4];
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my $enc_iv = $salt_arr[5];
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my $contents_hash;
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# specific to version 1
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my $inline_flag;
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my $contents_len;
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my $contents;
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# specific to version 2
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my $expected_bytes;
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# specific to keyfile handling
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my $inline_keyfile_flag;
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my $keyfile_len;
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my $keyfile_content;
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my $keyfile_attributes = "";
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$final_random_seed = pack ("H*", $final_random_seed);
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$transf_random_seed = pack ("H*", $transf_random_seed);
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$enc_iv = pack ("H*", $enc_iv);
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my $intermediate_hash = sha256 ($word);
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if ($version == 1)
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{
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$contents_hash = $salt_arr[6];
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$contents_hash = pack ("H*", $contents_hash);
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$inline_flag = $salt_arr[7];
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$contents_len = $salt_arr[8];
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$contents = $salt_arr[9];
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$contents = pack ("H*", $contents);
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# keyfile handling
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if (scalar @salt_arr == 13)
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{
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$inline_keyfile_flag = $salt_arr[10];
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$keyfile_len = $salt_arr[11];
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$keyfile_content = $salt_arr[12];
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$keyfile_attributes = $keyfile_attributes
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. "*" . $inline_keyfile_flag
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. "*" . $keyfile_len
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. "*" . $keyfile_content;
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$intermediate_hash = $intermediate_hash . pack ("H*", $keyfile_content);
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$intermediate_hash = sha256 ($intermediate_hash);
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}
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}
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elsif ($version == 2)
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{
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# keyfile handling
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if (scalar @salt_arr == 11)
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{
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$inline_keyfile_flag = $salt_arr[8];
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$keyfile_len = $salt_arr[9];
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$keyfile_content = $salt_arr[10];
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$intermediate_hash = $intermediate_hash . pack ("H*", $keyfile_content);
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$keyfile_attributes = $keyfile_attributes
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. "*" . $inline_keyfile_flag
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. "*" . $keyfile_len
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. "*" . $keyfile_content;
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}
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$intermediate_hash = sha256 ($intermediate_hash);
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}
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my $aes = Crypt::Mode::ECB->new ('AES', 1);
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for (my $j = 0; $j < $iteration; $j++)
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{
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$intermediate_hash = $aes->encrypt ($intermediate_hash, $transf_random_seed);
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$intermediate_hash = substr ($intermediate_hash, 0, 32);
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}
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$intermediate_hash = sha256 ($intermediate_hash);
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my $final_key = sha256 ($final_random_seed . $intermediate_hash);
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my $final_algorithm;
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if ($version == 1 && $algorithm == 1)
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{
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$final_algorithm = "Crypt::Twofish";
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}
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else
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{
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$final_algorithm = "Crypt::Rijndael";
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}
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my $cipher;
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if ($version == 1)
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{
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$cipher = Crypt::CBC->new ({
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key => $final_key,
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cipher => $final_algorithm,
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iv => $enc_iv,
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literal_key => 1,
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header => "none",
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padding => "standard",
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keysize => 32
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});
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}
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else
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{
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$cipher = Crypt::CBC->new ({
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key => $final_key,
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cipher => $final_algorithm,
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iv => $enc_iv,
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literal_key => 1,
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header => "none",
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padding => "none",
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keysize => 32
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});
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}
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my $hash;
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if ($version == 1)
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{
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if (defined $param)
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{
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# if we try to verify the crack, we need to decrypt the contents instead of only encrypting it:
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$contents = $cipher->decrypt ($contents);
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# and check the output
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my $contents_hash_old = $contents_hash;
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$contents_hash = sha256 ($contents);
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if ($contents_hash_old ne $contents_hash)
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{
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# fake content
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$contents = "\x00" x length ($contents);
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}
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}
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else
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{
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$contents_hash = sha256 ($contents);
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}
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$contents = $cipher->encrypt ($contents);
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$hash = sprintf ('$keepass$*%d*%d*%d*%s*%s*%s*%s*%d*%d*%s%s',
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$version,
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$iteration,
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$algorithm,
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unpack ("H*", $final_random_seed),
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unpack ("H*", $transf_random_seed),
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unpack ("H*", $enc_iv),
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unpack ("H*", $contents_hash),
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$inline_flag,
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$contents_len,
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unpack ("H*", $contents),
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$keyfile_attributes);
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}
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if ($version == 2)
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{
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$expected_bytes = $salt_arr[6];
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$contents_hash = $salt_arr[7];
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$contents_hash = pack ("H*", $contents_hash);
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$expected_bytes = $cipher->decrypt ($contents_hash);
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$expected_bytes = substr ($expected_bytes . "\x00" x 32, 0, 32); # padding
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$hash = sprintf ('$keepass$*%d*%d*%d*%s*%s*%s*%s*%s%s',
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$version,
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$iteration,
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$algorithm,
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unpack ("H*", $final_random_seed),
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unpack ("H*", $transf_random_seed),
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unpack ("H*", $enc_iv),
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unpack ("H*", $expected_bytes),
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unpack ("H*", $contents_hash),
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$keyfile_attributes);
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}
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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 $line = shift;
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my ($hash_in, $word) = split ":", $line;
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return unless defined $hash_in;
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return unless defined $word;
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my @data = split ('\*', $hash_in);
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return unless (scalar @data == 9
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|| scalar @data == 11
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|| scalar @data == 12
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|| scalar @data == 14);
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my $signature = shift @data;
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return unless ($signature eq '$keepass$');
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my $version = shift @data;
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return unless ($version == 1 || $version == 2);
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my $iteration = shift @data;
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my $algorithm = shift @data;
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my $final_random_seed = shift @data;
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if ($version == 1)
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{
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return unless (length ($final_random_seed) == 32);
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}
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elsif ($version == 2)
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{
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return unless (length ($final_random_seed) == 64);
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}
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my $transf_random_seed = shift @data;
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return unless (length ($transf_random_seed) == 64);
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my $enc_iv = shift @data;
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return unless (length ($enc_iv) == 32);
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if ($version == 1)
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{
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my $contents_hash = shift @data;
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return unless (length ($contents_hash) == 64);
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my $inline_flags = shift @data;
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return unless ($inline_flags == 1);
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my $contents_len = shift @data;
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my $contents = shift @data;
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return unless (length ($contents) == $contents_len * 2);
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}
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elsif ($version == 2)
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{
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my $expected_bytes = shift @data;
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return unless (length ($expected_bytes) == 64);
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my $contents_hash = shift @data;
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return unless (length ($contents_hash) == 64);
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}
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if (scalar @data == 12 || scalar @data == 14)
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{
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my $inline_flags = shift @data;
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return unless ($inline_flags == 1);
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my $keyfile_len = shift @data;
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return unless ($keyfile_len == 64);
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my $keyfile = shift @data;
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return unless (length ($keyfile) == $keyfile_len);
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}
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my $salt = substr ($hash_in, length ("*keepass*") + 1);
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my $param = 1; # distinguish between encrypting vs decrypting
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return unless defined $salt;
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$word = pack_if_HEX_notation ($word);
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my $new_hash = module_generate_hash ($word, $salt, $param);
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return ($new_hash, $word);
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}
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1;
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