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72 lines
1.5 KiB
72 lines
1.5 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 Digest::Keccak qw (keccak_256_hex);
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sub module_constraints { [[0, 256], [32, 32], [-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 $iterations = shift || 1024; # 262144 originally
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my $ciphertext = shift || random_bytes (32);
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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 => $iterations,
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out_len => 32
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);
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my $derived_key = $pbkdf2->PBKDF2 ($salt, $word);
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my $derived_key_cropped = substr ($derived_key, 16, 16);
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my $digest = keccak_256_hex ($derived_key_cropped . $ciphertext);
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my $hash = sprintf ("\$ethereum\$p*%i*%s*%s*%s", $iterations, unpack ("H*", $salt), unpack ("H*", $ciphertext), $digest);
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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\$p\*");
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my @data = split ('\*', $hash);
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return unless scalar (@data) == 5;
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shift @data;
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my $iterations = shift @data;
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my $salt = pack ("H*", shift @data);
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my $ciphertext = 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, $salt, $iterations, $ciphertext);
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return ($new_hash, $word);
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}
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1;
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