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149 lines
3.0 KiB
Perl
149 lines
3.0 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 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 = shift;
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my $hash_ver = shift;
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my $file_ver = shift;
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my $iter = shift;
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my $iv = shift;
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my $data = shift;
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my $FORMAT = 1;
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my $is_decrypt = defined ($data);
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if ($is_decrypt == 0)
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{
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my $type = random_number (1, 2);
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if ($type == 1)
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{
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$hash_ver = 1;
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$file_ver = 2;
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$iter = 100000;
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$salt = substr ($salt, 0, 32); # full one
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}
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else
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{
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$hash_ver = 2;
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$file_ver = 1;
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$iter = 4000;
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$salt = substr ($salt, 0, 16);
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}
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$salt = pack ("H*", $salt);
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$iv = random_bytes (16);
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$data = random_bytes (32);
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$data .= sha256 ($data);
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}
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my $pbkdf2 = Crypt::PBKDF2->new
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(
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hasher => Crypt::PBKDF2->hasher_from_algorithm ('HMACSHA1'),
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iterations => $iter,
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output_len => 16,
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);
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my $key = $pbkdf2->PBKDF2 ($salt, $word);
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# AES-CBC
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my $cipher = Crypt::CBC->new ({
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cipher => "Crypt::Rijndael",
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key => $key,
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iv => $iv,
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keysize => 16,
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literal_key => 1,
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header => "none",
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padding => "null"
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});
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if ($is_decrypt == 1)
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{
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my $hash_data = $data;
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$data = "WRONG";
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my $decrypted = $cipher->decrypt ($hash_data);
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my $raw_data = substr ($decrypted, 0, 32);
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my $checksum = substr ($decrypted, 32, 32);
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my $sha256_of_data = sha256 ($raw_data);
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if ($sha256_of_data eq $checksum)
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{
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$data = $decrypted;
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}
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}
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my $encrypted = $cipher->encrypt ($data);
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my $hash = sprintf ("\$iwork\$%i\$%i\$%i\$%i\$%s\$%s\$%s", $hash_ver, $file_ver, $FORMAT, $iter, unpack ("H*", $salt), unpack ("H*", $iv), unpack ("H*", $encrypted));
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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 $idx = index ($line, ':');
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return unless $idx >= 0;
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my $hash = substr ($line, 0, $idx);
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my $word = substr ($line, $idx + 1);
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return unless substr ($hash, 0, 7) eq '$iwork$';
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my (undef, undef, $hash_ver, $file_ver, $format, $iter, $salt, $iv, $data) = split '\$', $hash;
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next unless (defined ($hash_ver));
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next unless (defined ($file_ver));
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next unless (defined ($format));
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next unless (defined ($iter));
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next unless (defined ($salt));
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next unless (defined ($iv));
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next unless (defined ($data));
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next unless (($hash_ver eq '1') or ($hash_ver eq '2'));
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next unless (($file_ver eq '1') or ($file_ver eq '2'));
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next unless ($format eq '1');
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$salt = pack ("H*", $salt);
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$iv = pack ("H*", $iv);
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$data = pack ("H*", $data);
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$iter = int ($iter);
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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, $hash_ver, $file_ver, $iter, $iv, $data);
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return ($new_hash, $word);
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}
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1;
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