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#!/usr/bin/env perl
##
## Author......: See docs/credits.txt
## License.....: MIT
##
use strict;
use warnings;
use Digest::SHA qw (sha256);
use Crypt::CBC;
sub module_constraints { [[0, 256], [-1, -1], [0, 55], [-1, -1], [-1, -1]] }
sub module_generate_hash
{
my $word = shift;
my $iv = shift || random_hex_string (32);
my $salt_type = shift || 1;
my $plain_bin = shift;
if ($salt_type ne "1") { die "currently only salt_type 1 supported\n"; }
my $key_bin = sha256 (sha256 ($word));
my $iv_bin = pack ("H*", $iv);
my $cipher = Crypt::CBC->new ({
key => $key_bin,
cipher => "Crypt::Rijndael",
iv => $iv_bin,
literal_key => 1,
header => "none",
keysize => 32,
padding => "none",
});
if (defined $plain_bin)
{
my $encrypted_bin = pack ("H*", $plain_bin);
my $test = $cipher->decrypt ($encrypted_bin);
if ($test =~ /^[0-9a-f]+$/)
{
$plain_bin = $test;
}
else
{
$plain_bin = "\xff" x 16;
}
}
else
{
my $plain = "30313233343536373839616263646566";
$plain_bin = pack ("H*", $plain);
}
my $encrypted_bin = $cipher->encrypt ($plain_bin);
my $encrypted = unpack ("H*", $encrypted_bin);
my $hash = sprintf ("\$electrum\$%d*%s*%s", $salt_type, $iv, $encrypted);
return $hash;
}
sub module_verify_hash
{
my $line = shift;
my ($hash, $word) = split (':', $line);
return unless defined $hash;
return unless defined $word;
my @data = split (/\*/, $hash);
return unless scalar @data == 3;
my ($mode, $iv, $encrypted) = @data;
my (undef, $signature, $salt_type) = split ('\$', $mode);
return unless ($signature eq "electrum");
my $word_packed = pack_if_HEX_notation ($word);
my $new_hash = module_generate_hash ($word_packed, $iv, $salt_type, $encrypted);
return ($new_hash, $word);
}
sub get_random_jwt_salt
{
my @hashes =
(
"HS256",
#"HS384", #this is support in hashcat, but commented out here to prevent mixed hash output files in single mode
#"HS512", #this is support in hashcat, but commented out here to prevent mixed hash output files in single mode
#"RS256", #not supported by hashcat
#"RS384",
#"RS512",
#"PS256",
#"PS384",
#"PS512",
#"ES256",
#"ES384",
#"ES512",
);
my $rnd = random_number (0, scalar @hashes - 1);
my $hash = $hashes[$rnd];
my $header =
{
"alg" => $hash
};
my $random_key = random_number (1, 100000000);
my $random_val = random_number (1, 100000000);
my $payload =
{
$random_key => $random_val
};
my $header_json = encode_json ($header);
my $payload_json = encode_json ($payload);
my $header_base64 = encode_base64url ($header_json, "");
my $payload_base64 = encode_base64url ($payload_json, "");
return $header_base64 . "." . $payload_base64;
}
1;
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