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136 lines
2.6 KiB
Perl
136 lines
2.6 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::ScryptKDF qw (scrypt_raw);
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use Encode;
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use Crypt::CBC;
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sub module_constraints { [[0, 256], [8, 8], [-1, -1], [-1, -1], [-1, -1]] }
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my $SCRYPT_N = 16384;
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my $SCRYPT_R = 8;
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my $SCRYPT_P = 1;
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my $DATA_FIXED = "\x10\x10\x10\x10\x10\x10\x10\x10\x10\x10\x10\x10\x10\x10\x10\x10";
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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 $iv = shift // random_bytes (16);
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my $data = shift;
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my $word_utf16be = encode ('UTF-16BE', $word);
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my $key = scrypt_raw ($word_utf16be, $salt, $SCRYPT_N, $SCRYPT_R, $SCRYPT_P, 32);
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my $aes_cbc = Crypt::CBC->new ({
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cipher => "Crypt::Rijndael",
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iv => $iv,
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key => $key,
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keysize => 32,
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literal_key => 1,
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header => "none",
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padding => "none"
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});
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my $data_block = "";
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if (defined ($data)) # verify
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{
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my $data_dec = $aes_cbc->decrypt ($data);
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if ($data_dec eq $DATA_FIXED)
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{
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$data_block = $data;
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}
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}
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else
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{
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$data = $DATA_FIXED;
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$data_block = $aes_cbc->encrypt ($data);
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}
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my $hash = sprintf ("\$multibit\$3*%d*%d*%d*%s*%s", $SCRYPT_N, $SCRYPT_R, $SCRYPT_P, unpack ("H*", $salt), unpack ("H*", $iv . $data_block));
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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 $line = shift;
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return unless (substr ($line, 0, 12) eq '$multibit$3*');
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# split hash and word:
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my $idx1 = index ($line, ":", 12);
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return if ($idx1 < 1);
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my $hash = substr ($line, 0, $idx1);
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my $word = substr ($line, $idx1 + 1);
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# scrypt parameters:
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my $idx2 = index ($hash, "*", 12);
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return if ($idx2 < 0);
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my $scrypt_n = substr ($hash, 12, $idx2 - 12);
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$idx1 = index ($hash, "*", $idx2 + 1);
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return if ($idx1 < 0);
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my $scrypt_r = substr ($hash, $idx2 + 1, $idx1 - $idx2 - 1);
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$idx2 = index ($hash, "*", $idx1 + 1);
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return if ($idx2 < 0);
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my $scrypt_p = substr ($hash, $idx1 + 1, $idx2 - $idx1 - 1);
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# salt:
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$idx1 = index ($hash, "*", $idx2 + 1);
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return if ($idx1 < 0);
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my $salt = substr ($hash, $idx2 + 1, $idx1 - $idx2 - 1);
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# IV:
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my $iv = substr ($hash, $idx1 + 1, 32);
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# data:
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my $data = substr ($hash, $idx1 + 1 + 32, 32);
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return unless $salt =~ m/^[0-9a-fA-F]{16}$/;
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return unless $iv =~ m/^[0-9a-fA-F]{32}$/;
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return unless $data =~ m/^[0-9a-fA-F]{32}$/;
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# hex to binary/raw:
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$salt = pack ("H*", $salt);
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$iv = pack ("H*", $iv);
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$data = pack ("H*", $data);
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$word = pack_if_HEX_notation ($word);
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my $new_hash = module_generate_hash ($word, $salt, $iv, $data);
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return ($new_hash, $word);
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}
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1;
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