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121 lines
2.6 KiB
Perl
121 lines
2.6 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::PBKDF2;
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use Crypt::AuthEnc::GCM;
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use MIME::Base64 qw (decode_base64 encode_base64);
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sub module_constraints { [[0, 256], [64, 64], [-1, -1], [-1, -1], [-1, -1]] }
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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 $iv = shift // random_hex_string (32);
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my $ct = shift;
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my $ct_min_len = 30;
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my $ct_max_len = 768;
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my $kdf = Crypt::PBKDF2->new
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(
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hasher => Crypt::PBKDF2->hasher_from_algorithm ('HMACSHA2', 256),
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iterations => 10000,
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output_len => 32
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);
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my $salt_bin = pack ("H*", $salt);
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my $key = $kdf->PBKDF2 ($salt_bin, $word);
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my $iv_bin = pack ("H*", $iv);
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my $pt;
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if (defined $ct)
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{
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my $ct_bin = pack ("H*", $ct);
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my $data_bin = substr ($ct_bin, 0, -16);
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my $tag_bin = substr ($ct_bin, -16);
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my $aes = Crypt::AuthEnc::GCM->new ("AES", $key, $iv_bin);
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$pt = $aes->decrypt_add ($data_bin);
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my $result_tag = $aes->decrypt_done ($tag_bin);
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if ($result_tag == 1)
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{
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## correct password
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}
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else
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{
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$pt = "\xff" x ($ct_min_len + int(rand($ct_max_len - $ct_min_len)) + 1);
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}
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}
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else
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{
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$pt = "\xff" x ($ct_min_len + int(rand($ct_max_len - $ct_min_len)) + 1);
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}
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my $aes = Crypt::AuthEnc::GCM->new ("AES", $key, $iv_bin);
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my $ct_bin = $aes->encrypt_add ($pt);
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my $tag_bin = $aes->encrypt_done ();
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my $hash = sprintf ('$metamask$%s$%s$%s', encode_base64 ($salt_bin, ""), encode_base64 ($iv_bin, ""), encode_base64 ($ct_bin . $tag_bin, ""));
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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 $idx = index ($line, ':');
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return unless $idx >= 0;
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my $hash = substr ($line, 0, $idx);
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my $word = substr ($line, $idx + 1);
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return unless substr ($hash, 0, 10) eq '$metamask$';
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my (undef, $signature, $salt, $iv, $ct) = split '\$', $hash;
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return unless defined $signature;
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return unless defined $salt;
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return unless defined $iv;
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return unless defined $ct;
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my $salt_bin = decode_base64 ($salt);
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my $iv_bin = decode_base64 ($iv);
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my $ct_bin = decode_base64 ($ct);
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return unless length $salt_bin == 32;
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return unless length $iv_bin == 16;
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my $ct_len = length ($ct_bin);
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my $ct_min_len = 30;
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my $ct_max_len = 768;
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return unless ($ct_len >= $ct_min_len && $ct_len <= $ct_max_len);
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my $word_packed = pack_if_HEX_notation ($word);
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my $new_hash = module_generate_hash ($word_packed, unpack ("H*", $salt_bin), unpack ("H*", $iv_bin), unpack ("H*", $ct_bin));
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return ($new_hash, $word);
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}
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1;
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