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133 lines
3.6 KiB
133 lines
3.6 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 Digest::SHA qw (sha1 sha512);
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use Crypt::PBKDF2;
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use Encode;
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sub module_constraints { [[4, 127], [8, 8], [-1, -1], [-1, -1], [-1, -1]] }
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#
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# Helper functions:
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#
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sub exclusive_or
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{
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my $in1 = shift;
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my $in2 = shift;
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# MIN () function (should always be 16 for us):
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# my $len = (length ($in1) <= length ($in2)) ? length ($in2) : length ($in1);
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# padding if input not multiple of block size:
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# $in1 .= "\x00" x ($AES256_IGE_BLOCK_SIZE - $len);
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# $in2 .= "\x00" x ($AES256_IGE_BLOCK_SIZE - $len);
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my $out = "";
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for (my $i = 0; $i < length $in1; $i++) # $i < $len
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{
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$out .= chr (ord (substr ($in1, $i, 1)) ^ ord (substr ($in2, $i, 1)));
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}
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return $out;
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}
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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 // 10000;
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my $mk = shift // random_hex_string (128);
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my $hmac = shift // random_hex_string (64);
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my $blob = shift // random_hex_string (1384);
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my $magicv = shift // "785435725a573571565662727670754100";
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my $salt_bin = pack ("H*", $salt);
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my $mk_bin = pack ("H*", $mk);
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my $hmac_bin = pack ("H*", $hmac);
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my $blob_bin = pack ("H*", $blob);
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my $magicv_bin = pack ("H*", $magicv);
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## convert_userpin_to_secretpin()
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## this looks strange. what if the user password is outside 0x20 - 0x7f?
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## from some testing, it seems MS prevents the user to use any non-ascii characters
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my $stage1_hexpin = uc (encode ("UTF-16LE", unpack ("H*", $word)));
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my $pbkdf2 = Crypt::PBKDF2->new
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(
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hasher => Crypt::PBKDF2->hasher_from_algorithm ('HMACSHA2', 256),
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iterations => $iter,
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output_len => 32
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);
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my $stage2_pbkdf2 = $pbkdf2->PBKDF2 ($salt_bin, $stage1_hexpin);
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my $stage3_hexconvert = uc (encode ("UTF-16LE", unpack ("H*", $stage2_pbkdf2)));
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my $stage4_sha512 = sha512 ($stage3_hexconvert);
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## is_signature_matching()
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my $masterkey = sha1 ($mk_bin) . "\x00" x 108;
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my $sub_digest_seed = exclusive_or ($masterkey, "\x36" x 128);
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my $main_digest_seed = exclusive_or ($masterkey, "\x5c" x 128);
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my $sub_digest = sha512 ($sub_digest_seed . $hmac_bin . $magicv_bin . $stage4_sha512 . $blob_bin);
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my $main_digest = sha512 ($main_digest_seed . $sub_digest);
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my $hash = sprintf ("\$WINHELLO\$*SHA512*%i*%s*%s*%s*%s*%s*%s", $iter, unpack ("H*", $salt_bin), unpack ("H*", $main_digest), unpack ("H*", $mk_bin), unpack ("H*", $hmac_bin), unpack ("H*", $blob_bin), unpack ("H*", $magicv_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 $idx = index ($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, $idx + 1);
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my ($signature, $algo, $iter, $pin_salt, $sign, $mk, $hmac, $verify_blob, $magicv) = split '\*', $hash;
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return unless defined $signature;
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return unless defined $algo;
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return unless defined $iter;
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return unless defined $pin_salt;
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return unless defined $sign;
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return unless defined $mk;
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return unless defined $hmac;
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return unless defined $verify_blob;
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return unless defined $magicv;
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return unless ($signature eq '$WINHELLO$');
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return unless ($algo eq 'SHA512');
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return unless (length $pin_salt eq 8);
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return unless (length $sign eq 128);
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return unless (length $mk eq 128);
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return unless (length $hmac eq 64);
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return unless (length $verify_blob eq 1384);
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my $word_packed = pack_if_HEX_notation ($word);
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my $new_hash = module_generate_hash ($word, $pin_salt, $iter, $mk, $hmac, $verify_blob, $magicv);
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return ($new_hash, $word);
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}
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1;
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