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103 lines
2.0 KiB
103 lines
2.0 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::CBC;
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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_str = shift;
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my $ct_str = shift;
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my $iv_str = "";
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if (defined $ct_str)
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{
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$iv_str = substr($ct_str, 0, 32);
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}
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else
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{
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$iv_str = random_hex_string (32);
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}
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my $salt = pack ("H*", $salt_str);
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my $iv = pack ("H*", $iv_str);
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my $iterations = 10000;
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my $hasher = Crypt::PBKDF2->hasher_from_algorithm ('HMACSHA1');
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my $pbkdf2 = Crypt::PBKDF2->new (
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hasher => $hasher,
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iterations => $iterations,
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output_len => 32
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);
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my $key = $pbkdf2->PBKDF2 ($salt, $word);
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my $cipher = 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 => 32
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});
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my $hash = "";
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my $data = 'type=key:cipher=';
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my $encrypted = unpack ("H*", $cipher->encrypt ($data));
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if (defined $ct_str)
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{
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my $ct_bin = pack ("H*", $ct_str);
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my $iv_bin = substr ($ct_bin, 0, 16);
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$hash = sprintf ("\$vmx\$0\$%s\$%s\$%s%s", $iterations, unpack ("H*", $salt), unpack ("H*", $iv_bin), substr ($encrypted, 0, 32));
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}
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else
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{
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$hash = sprintf ("\$vmx\$0\$%s\$%s\$%s%s", $iterations, unpack ("H*", $salt), unpack ("H*", $iv), substr ($encrypted, 0, 32));
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}
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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 (undef, $signature, $version, $rounds, $salt, $ct) = split '\$', $hash;
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return unless ($signature eq "vmx");
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return unless ($version eq 0);
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return unless ($rounds eq 10000);
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return unless (length $ct eq 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, $salt, $ct);
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return ($new_hash, $word);
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}
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1;
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