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110 lines
2.5 KiB
110 lines
2.5 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::AuthEnc::GCM;
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use Crypt::ScryptKDF qw (scrypt_raw);
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use MIME::Base64 qw (decode_base64 encode_base64);
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sub module_constraints { [[4, 256], [64, 64], [-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 $scrypt_n = shift // 16384;
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my $scrypt_r = shift // 8;
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my $scrypt_p = shift // 1;
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my $iv = shift // random_hex_string (24);
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my $data = shift;
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my $tag = shift;
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my $salt_bin = pack ("H*", $salt);
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my $key_bin = scrypt_raw ($word, $salt_bin, $scrypt_n, $scrypt_r, $scrypt_p, 32);
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my $iv_bin = pack ("H*", $iv);
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my $pt;
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if (defined $data)
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{
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my $data_bin = pack ("H*", $data);
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my $aes = Crypt::AuthEnc::GCM->new ("AES", $key_bin, $iv_bin);
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$pt = $aes->decrypt_add ($data_bin);
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my $tag_bin = pack ("H*", $tag);
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my $result_tag = $aes->decrypt_done ($tag_bin);
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if ($result_tag == 1)
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{
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## correct password
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}
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else
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{
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$pt = random_bytes (32);
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}
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}
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else
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{
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$pt = random_bytes (32);
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}
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my $aes = Crypt::AuthEnc::GCM->new ("AES", $key_bin, $iv_bin);
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my $ct_bin = $aes->encrypt_add ($pt);
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my $tag_bin = $aes->encrypt_done ();
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my $hash = sprintf ('EXODUS:%u:%u:%u:%s:%s:%s:%s', $scrypt_n, $scrypt_r, $scrypt_p, encode_base64 ($salt_bin, ""), encode_base64 ($iv_bin, ""), encode_base64 ($ct_bin, ""), encode_base64 ($tag_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 $idx = rindex ($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, 6) eq 'EXODUS';
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my ($signature, $scrypt_n, $scrypt_r, $scrypt_p, $salt, $iv, $data, $tag) = split ':', $hash;
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return unless defined $signature;
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return unless defined $scrypt_n;
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return unless defined $scrypt_r;
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return unless defined $scrypt_p;
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return unless defined $salt;
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return unless defined $iv;
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return unless defined $data;
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return unless defined $tag;
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$salt = decode_base64 ($salt);
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$iv = decode_base64 ($iv);
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$data = decode_base64 ($data);
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$tag = decode_base64 ($tag);
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my $word_packed = pack_if_HEX_notation ($word);
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my $new_hash = module_generate_hash ($word_packed, unpack ("H*", $salt), $scrypt_n, $scrypt_r, $scrypt_p, unpack ("H*", $iv), unpack ("H*", $data), unpack ("H*", $tag));
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return ($new_hash, $word);
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}
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1;
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