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https://github.com/hashcat/hashcat.git
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171 lines
3.2 KiB
Perl
171 lines
3.2 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 Crypt::Mode::ECB;
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use Digest::SHA qw (sha1);
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sub module_constraints { [[0, 256], [-1, -1], [-1, -1], [-1, -1], [-1, -1]] }
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sub get_random_axcrypt_salt
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{
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my $mysalt = random_bytes (16);
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$mysalt = unpack ("H*", $mysalt);
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my $iteration = random_number (6, 99999);
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my $salt_buf = $iteration . '*' . $mysalt;
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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_axcrypt_salt ();
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}
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my @salt_arr = split ('\*', $salt);
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my $iteration = $salt_arr[0];
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my $mysalt = $salt_arr[1];
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$mysalt = pack ("H*", $mysalt);
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my $iv = "a6a6a6a6a6a6a6a6";
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my $KEK = sha1 ($word);
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$KEK = substr ($KEK ^ $mysalt, 0, 16);
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my $aes = Crypt::Mode::ECB->new ('AES', 0);
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my $B;
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my $A;
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my @R = ();
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if (defined $param)
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{
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$param = pack ("H*", $param);
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$A = substr ($param, 0, 8);
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$B = 0x00 x 8;
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$R[1] = substr ($param, 8, 8);
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$R[2] = substr ($param, 16, 8);
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for (my $j = $iteration - 1; $j >= 0; $j--)
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{
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$A = substr ($A, 0, 8) ^ pack ("l", (2 * $j + 2));
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$B = $R[2];
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$A = $aes->decrypt (substr ($A . $B . "\x00" x 16, 0, 16), $KEK);
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$R[2] = substr ($A, 8, 16);
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$A = substr ($A, 0, 8) ^ pack ("l", (2 * $j + 1));
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$B = $R[1];
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$A = $aes->decrypt (substr ($A . $B . "\x00" x 16, 0, 16), $KEK);
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$R[1] = substr ($A, 8, 16);
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}
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# check if valid
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if (index ($A, "\xa6\xa6\xa6\xa6\xa6\xa6\xa6\xa6") != 0)
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{
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# fake wrong @R and $A values
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@R = ('', "\x00" x 8, "\x00" x 8);
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$A = "\x00" x 16;
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}
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}
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else
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{
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my $DEK = random_hex_string (32);
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@R = ('', substr (pack ("H*", $DEK), 0, 8), substr (pack ("H*", $DEK), 8, 16));
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$A = pack ("H*", $iv);
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}
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for (my $j = 0; $j < $iteration; $j++)
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{
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$B = $aes->encrypt (substr ($A . $R[1] . "\x00" x 16, 0, 16), $KEK);
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$A = substr ($B, 0, 8) ^ pack ("q", (2 * $j + 1));
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$R[1] = substr ($B, 8, 16);
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$B = $aes->encrypt (substr ($A . $R[2] . "\x00" x 16, 0, 16), $KEK);
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$A = substr ($B, 0, 8) ^ pack ("q", (2 * $j + 2));
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$R[2] = substr ($B, 8, 16);
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}
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my $wrapped_key = unpack ("H*", $A . substr ($R[1], 0 ,8) . substr ($R[2], 0 ,8));
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$mysalt = unpack ("H*", $mysalt);
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my $hash = sprintf ('$axcrypt$*1*%s*%s*%s', $iteration, $mysalt, $wrapped_key);
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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 == 5;
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my $signature = shift @data;
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my $version = shift @data;
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my $iteration = shift @data;
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my $mysalt = shift @data;
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my $digest = shift @data;
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return unless ($signature eq '$axcrypt$');
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return unless (length ($mysalt) == 32);
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return unless (length ($digest) == 48);
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my $salt = $iteration . '*' . $mysalt;
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my $param = $digest;
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return unless defined $salt;
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return unless defined $param;
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$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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