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87 lines
1.6 KiB
87 lines
1.6 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 Digest::HMAC qw (hmac_hex);
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use Digest::SHA qw (sha256);
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sub module_constraints { [[0, 256], [-1, -1], [-1, -1], [-1, -1], [-1, -1]] }
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sub get_random_cloudkeychain_salt
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{
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my $salt_buf = random_bytes (16 + 304);
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my $ret = unpack ("H*", $salt_buf);
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return $ret;
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}
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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 $iter = shift // 40000;
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if (length $salt == 0)
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{
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$salt = get_random_cloudkeychain_salt ();
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}
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my $salt_hex = substr ($salt, 0, 32);
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my $salt_bin = pack ("H*", $salt_hex);
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my $data_hex = substr ($salt, 32);
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my $data_bin = pack ("H*", $data_hex);
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my $pbkdf2 = Crypt::PBKDF2->new
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(
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hasher => Crypt::PBKDF2->hasher_from_algorithm ('HMACSHA2', 512),
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iterations => $iter
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);
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my $key = $pbkdf2->PBKDF2 ($salt_bin, $word);
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my $hash_buf = hmac_hex ($data_bin, substr ($key, 32, 32), \&sha256, 64);
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my $hash = sprintf ("%s:%s:%d:%s", $hash_buf, $salt_hex, $iter, $data_hex);
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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 @datas = split (":", $line);
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return if scalar @datas < 4;
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my $hash = shift @datas;
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my $salt = shift @datas;
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my $iter = shift @datas;
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my $data = shift @datas;
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$salt .= $data;
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my $word = join (":", @datas);
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return unless defined $salt;
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return unless defined $word;
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$word = pack_if_HEX_notation ($word);
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my $new_hash = module_generate_hash ($word, $salt, $iter);
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return ($new_hash, $word);
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}
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1;
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