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95 lines
2.2 KiB
95 lines
2.2 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], [-1, -1], [-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; # unused
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my $version = shift // 5;
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my $iter = shift // 10000;
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my $user_salt = shift // random_hex_string (128);
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my $ck_salt = shift // random_hex_string (128);
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my $user_iv = shift // random_hex_string (32);
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my $masterkey_blob = shift; # use this as hint regular or verify call
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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 => 32
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);
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my $user_salt_bin = pack ("H*", $user_salt);
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my $key_bin = $kdf->PBKDF2 ($user_salt_bin, $word);
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my $iv_bin = pack ("H*", $user_iv);
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my $cipher = Crypt::CBC->new ({
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key => $key_bin,
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cipher => "Crypt::Rijndael",
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iv => $iv_bin,
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literal_key => 1,
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header => "none",
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keysize => 32,
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padding => "standard",
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});
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my $decrypted_bin = random_bytes (83);
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if (defined $masterkey_blob)
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{
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my $encrypted_bin = pack ("H*", $masterkey_blob);
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my $test_bin = $cipher->decrypt ($encrypted_bin);
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if (length ($test_bin) == 83)
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{
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$decrypted_bin = $test_bin;
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}
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}
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my $encrypted_bin = $cipher->encrypt ($decrypted_bin);
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my $hash = sprintf ("\$ab\$%u*0*%u*%s*%s*%s*%s", $version, $iter, $user_salt, $ck_salt, $user_iv, unpack ("H*", $encrypted_bin));
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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 $word;
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my ($tag, $cipher, $iter, $user_salt, $ck_salt, $user_iv, $masterkey_blob) = split (/\*/, $hash);
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my (undef, $signature, $version) = split (/\$/, $tag);
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return unless $signature eq "ab";
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return unless $cipher eq "0";
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my $word_packed = pack_if_HEX_notation ($word);
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my $new_hash = module_generate_hash ($word_packed, undef, $version, $iter, $user_salt, $ck_salt, $user_iv, $masterkey_blob);
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return ($new_hash, $word);
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}
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1;
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