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90 lines
1.7 KiB
Perl
90 lines
1.7 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 Digest::SHA qw (sha256);
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use Digest::HMAC qw (hmac_hex);
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use Encode;
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sub module_constraints { [[0, 256], [16, 16], [-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_aes = shift // random_bytes (16);
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my $key_aes = shift // random_bytes (32);
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my $word_utf16le = encode ('UTF-16le', $word);
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my $key = $salt . "\x00" x 16;
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for (my $i = 0; $i < 8192; $i++)
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{
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$key = sha256 ($key . $word_utf16le);
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}
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my $digest = hmac_hex ($iv_aes . $key_aes, $key, \&sha256, 64);
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# hex conversion:
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my $salt_hex = unpack ("H*", $salt);
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my $iv_hex = unpack ("H*", $iv_aes);
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my $key_hex = unpack ("H*", $key_aes);
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my $hash = sprintf ("\$aescrypt\$1*%s*%s*%s*%s", $salt_hex, $iv_hex, $key_hex, $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 @data = split ('\*', $hash);
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return unless (scalar (@data) == 5);
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my $signature = substr ($data[0], 0, 10);
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return unless ($signature eq "\$aescrypt\$");
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my $version = substr ($data[0], 10);
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return unless ($version eq "1");
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my $salt = $data[1];
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my $iv = $data[2];
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my $key = $data[3];
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return unless (length ($salt) == 32); # hex lengths
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return unless (length ($iv) == 32);
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return unless (length ($key) == 64);
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# binary conversion:
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$salt = pack ("H*", $salt);
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$iv = pack ("H*", $iv);
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$key = pack ("H*", $key);
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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, $iv, $key);
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return ($new_hash, $word);
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}
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1;
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