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Unit test for -m 31800. Working, but not final. On hold until extraction tool is updated

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jsteube 2023-04-03 20:35:23 +00:00
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#!/usr/bin/env perl
##
## Author......: See docs/credits.txt
## License.....: MIT
##
use strict;
use warnings;
use Crypt::PBKDF2;
use Crypt::AuthEnc::GCM;
use MIME::Base64 qw (decode_base64 encode_base64);
use Crypt::KeyDerivation ':all';
sub module_constraints { [[0, 256], [32, 32], [-1, -1], [-1, -1], [-1, -1]] }
sub module_generate_hash
{
my $word = shift;
my $salt = shift;
my $iterations = shift;
my $email = shift;
my $algorithm = shift;
my $secret_key = shift;
my $ct = shift;
my $plaintext_length = shift;
my $iv = shift;
my $cryptext = shift;
my $expected_hmac = shift;
my $hmac_d_data = shift;
my $salt_bin = pack ("H*", $salt);
my $hkdf_pass_salt = hkdf ($salt_bin, $email, 'SHA256', 32, "PBES2g-HS256");
my $kdf = Crypt::PBKDF2->new
(
hasher => Crypt::PBKDF2->hasher_from_algorithm ('HMACSHA2', 256),
iterations => $iterations,
output_len => 32
);
my $password_key = $kdf->PBKDF2 ($hkdf_pass_salt, $word);
my $hkdf_key = hkdf ("798JRYLJVD423DC286TVMH43EB", "ASWWYB", 'SHA256', 32, "A3");
my $muk = xor_len ($password_key, $hkdf_key, 32);
my $pt;
my $iv_bin;
if (defined $ct)
{
my $ct_bin = pack ("H*", $ct);
$iv_bin = substr ($ct_bin, 0 + length ("opdata01"), 16);
my $data_bin = substr ($ct_bin, 0 + length ("opdata01") + 16, -16);
my $tag_bin = substr ($ct_bin, -16);
my $aes = Crypt::AuthEnc::GCM->new ("AES", $muk, $iv_bin);
$pt = $aes->decrypt_add ($data_bin);
my $result_tag = $aes->decrypt_done ($tag_bin);
if ($result_tag == 1)
{
## correct password
}
else
{
$pt = "{'key_ops': ['decrypt', 'encrypt'], 'kty': 'oct', 'alg': 'A256GCM', 'k': 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx=', 'ext': True, 'kid': 'xxxxxxxxxxxxxxxxxxxxxxxxxx'}";
}
}
else
{
$pt = "{'key_ops': ['decrypt', 'encrypt'], 'kty': 'oct', 'alg': 'A256GCM', 'k': 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx=', 'ext': True, 'kid': 'xxxxxxxxxxxxxxxxxxxxxxxxxx'}";
}
my $aes = Crypt::AuthEnc::GCM->new ("AES", $muk, $iv_bin);
my $ct_bin = $aes->encrypt_add ($pt);
my $tag_bin = $aes->encrypt_done ();
## so far so good
my $hash = sprintf
(
'$mobilekeychain$%s',
unpack ("H*", "opdata01" . $iv_bin . $ct_bin . $tag_bin)
);
return $hash;
}
sub module_verify_hash
{
my $line = shift;
my $idx = index ($line, ':');
return unless $idx >= 0;
my $hash = substr ($line, 0, $idx);
my $word = substr ($line, $idx + 1);
return unless substr ($hash, 0, 16) eq '$mobilekeychain$';
my (undef, $signature, $email, $salt_len, $salt, $algorithm, $secret_key, $iterations, $ct_len, $ct, $plaintext_length, $iv_len, $iv, $cryptext_len, $cryptext, $expected_hmac_len, $expected_hmac, $hmac_d_data_len, $hmac_d_data) = split '\$', $hash;
return unless defined $signature;
return unless defined $email;
return unless defined $salt_len;
return unless defined $salt;
return unless defined $algorithm;
return unless defined $secret_key;
return unless defined $iterations;
return unless defined $ct_len;
return unless defined $ct;
return unless defined $plaintext_length;
return unless defined $iv_len;
return unless defined $iv;
return unless defined $cryptext_len;
return unless defined $cryptext;
return unless defined $expected_hmac_len;
return unless defined $expected_hmac;
return unless defined $hmac_d_data_len;
return unless defined $hmac_d_data;
my $salt_bin = pack ("H*", $salt);
my $ct_bin = pack ("H*", $ct);
my $iv_bin = pack ("H*", $iv);
my $cryptext_bin = pack ("H*", $cryptext);
my $expected_hmac_bin = pack ("H*", $expected_hmac);
my $hmac_d_data_bin = pack ("H*", $hmac_d_data);
return unless length ($salt_bin) == $salt_len;
return unless length ($ct_bin) == $ct_len;
return unless length ($iv_bin) == $iv_len;
return unless length ($cryptext_bin) == $cryptext_len;
return unless length ($expected_hmac_bin) == $expected_hmac_len;
return unless length ($hmac_d_data_bin) == $hmac_d_data_len;
my $word_packed = pack_if_HEX_notation ($word);
my $new_hash = module_generate_hash ($word_packed, $salt, $iterations, $email, $algorithm, $secret_key, $ct, $plaintext_length, $iv, $cryptext, $expected_hmac, $hmac_d_data);
return ($new_hash, $word);
}
sub xor_len
{
my $in1 = shift;
my $in2 = shift;
my $len = shift;
my $out;
for (my $i = 0; $i < $len; $i++)
{
$out .= chr (ord (substr ($in1, $i, 1)) ^ ord (substr ($in2, $i, 1)));
}
return $out;
}
1;