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112 lines
2.1 KiB
112 lines
2.1 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::CBC;
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use Crypt::PBKDF2;
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use Digest::Keccak qw (keccak_256_hex);
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sub module_constraints { [[0, 256], [40, 40], [-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 $ethaddr = shift;
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my $encseed = shift;
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my $iv = "";
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my $seed = "";
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# setup pbkdf2 params:
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my $pbkdf2 = Crypt::PBKDF2->new
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(
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hasher => Crypt::PBKDF2->hasher_from_algorithm ('HMACSHA2', 256),
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iterations => 2000,
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output_len => 16
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);
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my $key = $pbkdf2->PBKDF2 ($word, $word);
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if (defined $encseed)
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{
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$iv = substr ($encseed, 0, 16);
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$encseed = substr ($encseed, 16);
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# AES-128-CBC decrypt:
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my $aes_cbc = Crypt::CBC->new ({
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key => $key,
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cipher => "Crypt::Rijndael",
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iv => $iv,
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literal_key => 1,
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header => "none",
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keysize => 16
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});
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$seed = $aes_cbc->decrypt ($encseed);
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}
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else
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{
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$iv = random_bytes (16);
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$seed = random_bytes (592);
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# AES-128-CBC encrypt:
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my $aes_cbc = Crypt::CBC->new ({
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key => $key,
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cipher => "Crypt::Rijndael",
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iv => $iv,
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literal_key => 1,
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header => "none",
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keysize => 16
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});
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$encseed = $aes_cbc->encrypt ($seed);
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}
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my $digest = keccak_256_hex ($seed . "\x02");
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my $hash = sprintf ("\$ethereum\$w*%s*%s*%s", unpack ("H*", $iv . $encseed), $ethaddr, substr ($digest, 0, 32));
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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 $line = shift;
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my ($hash, $word) = split (':', $line);
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return unless defined $hash;
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return unless defined $word;
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my $signature = substr ($hash, 0, 12);
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return unless ($signature eq "\$ethereum\$w\*");
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my @data = split ('\*', $hash);
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return unless scalar (@data) == 4;
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shift @data;
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my $encseed = pack ("H*", shift @data);
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my $ethaddr = shift @data;
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my $bpk = pack ("H*", shift @data);
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my $word_packed = pack_if_HEX_notation ($word);
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my $new_hash = module_generate_hash ($word_packed, $ethaddr, $encseed, $bpk);
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return ($new_hash, $word);
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}
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1;
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