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Banaanhangwagen 2022-09-16 16:25:09 +02:00 committed by GitHub
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#!/usr/bin/env perl
##
## Author......: See docs/credits.txt
## License.....: MIT
##
use strict;
use warnings;
use Crypt::ScryptKDF qw (scrypt_raw);
use Encode;
use Crypt::CBC;
sub module_constraints { [[0, 256], [8, 8], [-1, -1], [-1, -1], [-1, -1]] }
my $SCRYPT_N = 32768;
my $SCRYPT_R = 8;
my $SCRYPT_P = 6;
my $DATA_FIXED = "\x10\x10\x10\x10\x10\x10\x10\x10\x10\x10\x10\x10\x10\x10\x10\x10";
sub module_generate_hash
{
my $word = shift;
my $salt = shift;
my $iv = shift // random_bytes (16);
my $data = shift;
my $word_utf16be = encode ('UTF-16BE', $word);
my $key = scrypt_raw ($word_utf16be, $salt, $SCRYPT_N, $SCRYPT_R, $SCRYPT_P, 32);
my $aes_cbc = Crypt::CBC->new ({
cipher => "Crypt::Rijndael",
iv => $iv,
key => $key,
keysize => 32,
literal_key => 1,
header => "none",
padding => "none"
});
my $data_block = "";
if (defined ($data)) # verify
{
my $data_dec = $aes_cbc->decrypt ($data);
if ($data_dec eq $DATA_FIXED)
{
$data_block = $data;
}
}
else
{
$data = $DATA_FIXED;
$data_block = $aes_cbc->encrypt ($data);
}
my $hash = sprintf ("\$bisq\$3*%d*%d*%d*%s*%s", $SCRYPT_N, $SCRYPT_R, $SCRYPT_P, unpack ("H*", $salt), unpack ("H*", $iv . $data_block));
return $hash;
}
sub module_verify_hash
{
my $line = shift;
return unless (substr ($line, 0, 8) eq '$bisq$3*');
# split hash and word:
my $idx1 = index ($line, ":", 12);
return if ($idx1 < 1);
my $hash = substr ($line, 0, $idx1);
my $word = substr ($line, $idx1 + 1);
# scrypt parameters:
my $idx2 = index ($hash, "*", 12);
return if ($idx2 < 0);
my $scrypt_n = substr ($hash, 12, $idx2 - 12);
$idx1 = index ($hash, "*", $idx2 + 1);
return if ($idx1 < 0);
my $scrypt_r = substr ($hash, $idx2 + 1, $idx1 - $idx2 - 1);
$idx2 = index ($hash, "*", $idx1 + 1);
return if ($idx2 < 0);
my $scrypt_p = substr ($hash, $idx1 + 1, $idx2 - $idx1 - 1);
# salt:
$idx1 = index ($hash, "*", $idx2 + 1);
return if ($idx1 < 0);
my $salt = substr ($hash, $idx2 + 1, $idx1 - $idx2 - 1);
# IV:
my $iv = substr ($hash, $idx1 + 1, 32);
# data:
my $data = substr ($hash, $idx1 + 1 + 32, 32);
return unless $salt =~ m/^[0-9a-fA-F]{16}$/;
return unless $iv =~ m/^[0-9a-fA-F]{32}$/;
return unless $data =~ m/^[0-9a-fA-F]{32}$/;
# hex to binary/raw:
$salt = pack ("H*", $salt);
$iv = pack ("H*", $iv);
$data = pack ("H*", $data);
$word = pack_if_HEX_notation ($word);
my $new_hash = module_generate_hash ($word, $salt, $iv, $data);
return ($new_hash, $word);
}
1;