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110 lines
2.6 KiB
110 lines
2.6 KiB
#!/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 { [[8, 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 $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 $ct_len = 64;
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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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$pt = "[{\"type\":\"HD Key Tree\",\"data\":{\"mnemonic\":[112,97,121,109,101,110,116,32,117,112,115,101,116,32,109,101,116,97,108,32,99,104,97,112,116,101,114,32,114,117,110,32,97,100,109,105,116,32,109,101,97,115,117,114,101,32,114,101,109,105,110,100,32,115,117,112,112,108,121,32,104,111,112,101,32,101,110,101,109,121,32,104,101,100,103,101,104,111,103],\"numberOfAccounts\":1,\"hdPath\":\"m/44'/60'/0'/0\"}}]";
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}
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else # verify / decrypt
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{
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my $ct_bin = pack ("H*", $ct);
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my $aes = Crypt::AuthEnc::GCM->new ("AES", $key, $iv_bin);
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$pt = $aes->decrypt_add ($ct_bin);
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if ($pt =~ m/^[ -~]*$/) # is_valid_printable_32 ()
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{
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# ok
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}
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else
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{
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$pt = ""; # fake
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}
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}
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$pt = substr ($pt, 0, $ct_len);
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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 $hash = sprintf ('$metamask-short$%s$%s$%s', encode_base64 ($salt_bin, ""), encode_base64 ($iv_bin, ""), encode_base64 ($ct_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, 16) eq '$metamask-short$';
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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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return unless length $ct_bin == 64;
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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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