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138 lines
2.9 KiB
Perl
138 lines
2.9 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 Crypt::GCrypt;
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use Crypt::PBKDF2;
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use Digest::SHA qw (sha1 sha1_hex);
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sub module_constraints { [[0, 51], [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 $iter = shift // 100000;
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my $iv = shift // random_hex_string (2 * 8);
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my $plain = shift // random_hex_string (2 * 1024);
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my $b_iv = pack ('H*', $iv);
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my $b_salt = pack ('H*', $salt);
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my $b_plain = pack ('H*', $plain);
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my $kdf = Crypt::PBKDF2->new
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(
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hash_class => 'HMACSHA1',
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iterations => $iter,
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output_len => 16
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);
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my $pass_hash = sha1 ($word);
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my $key = $kdf->PBKDF2 ($b_salt, $pass_hash);
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my $cfb = Crypt::GCrypt->new
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(
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type => 'cipher',
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algorithm => 'blowfish',
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mode => 'cfb'
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);
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$cfb->start ('encrypting');
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$cfb->setkey ($key);
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$cfb->setiv ($b_iv);
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my $b_cipher = $cfb->encrypt ($b_plain);
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$cfb->finish ();
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my $cipher = unpack ('H*', $b_cipher);
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my $checksum = sha1_hex ($b_plain);
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my $hash = '$odf$'."*0*0*$iter*16*$checksum*8*$iv*16*$salt*0*$cipher";
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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 $word_packed = pack_if_HEX_notation ($word);
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# tokenize
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my @data = split ('\*', $hash);
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next unless scalar @data == 12;
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my $signature = shift @data;
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my $cipher_type = shift @data;
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my $cs_type = shift @data;
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my $iter = shift @data;
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my $cs_len = shift @data;
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my $cs = shift @data;
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my $iv_len = shift @data;
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my $iv = shift @data;
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my $salt_len = shift @data;
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my $salt = shift @data;
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my $unused = shift @data;
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my $cipher = shift @data;
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# validate
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return unless $signature eq '$odf$';
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return unless $cipher_type eq '0';
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return unless $cs_type eq '0';
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return unless $cs_len eq '16';
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return unless $iv_len eq '8';
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return unless $salt_len eq '16';
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return unless $unused eq '0';
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return unless defined $cipher;
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# decrypt
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my $b_iv = pack ('H*', $iv);
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my $b_salt = pack ('H*', $salt);
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my $b_cipher = pack ('H*', $cipher);
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my $kdf = Crypt::PBKDF2->new
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(
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hash_class => 'HMACSHA1',
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iterations => $iter,
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output_len => 16
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);
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my $pass_hash = sha1 ($word);
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my $key = $kdf->PBKDF2 ($b_salt, $pass_hash);
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my $cfb = Crypt::GCrypt->new(
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type => 'cipher',
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algorithm => 'blowfish',
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mode => 'cfb'
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);
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$cfb->start ('decrypting');
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$cfb->setkey ($key);
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$cfb->setiv ($b_iv);
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my $b_plain = $cfb->decrypt ($b_cipher);
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$cfb->finish ();
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my $plain = unpack ('H*', $b_plain);
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my $new_hash = module_generate_hash ($word_packed, $salt, $iter, $iv, $plain);
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return ($new_hash, $word);
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}
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1;
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