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Add unit-test for -m 29940
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Jens Steube
parent
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235
tools/test_modules/m29940.pm
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235
tools/test_modules/m29940.pm
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#!/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::Mode::ECB;
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use Digest::MD5 qw (md5);
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my $ENC_MAX_KEY_NUM = 8;
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my $ENC_NONCE_SIZE = 8;
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my $ENC_KEY_SIZE = 16;
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my $ENC_BLOCK_SIZE = 16;
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my $ENC_KEYCHAIN_SIZE = 128;
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my $ENC_DEFAULT_MD5_ITERATIONS = 1000;
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my @default_salts =
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(
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"\x0f\xc9\xe7\xd0\x8b\xe4\x24\xf6\x56\x9d\x4e\x72\xed\xbc\x2c\x5c",
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"\xdd\x79\x74\xf3\x3d\x83\x00\xc2\x9b\xd2\x93\xd5\x7f\x9d\x9b\x8c",
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"\x60\x85\x0c\x47\x58\x46\xe2\x96\x2d\x99\x5d\x5e\xf1\xd0\x6a\x28",
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"\xe2\x3f\x3d\x6b\x99\x61\x4b\xa9\xc4\xed\xc5\xdd\xd8\x25\x3c\xe1",
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"\x2c\xa4\x59\x89\x1d\x78\x52\xdb\x30\x31\xd0\x9f\x9f\x34\x88\x35",
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"\xdb\x1b\xb5\x27\xe8\x21\x4f\x79\xa0\xb2\xcb\x32\x42\xd9\xf2\x0a",
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"\xae\xa8\xb6\x8e\xd0\x7b\x62\xa1\x40\x0e\x17\xc6\xad\x64\x20\xc8",
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"\xea\xe3\xf4\x4e\xaf\x4a\x8f\x84\xf1\xfa\xb3\x08\x85\x69\xbe\xf8"
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);
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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;
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my $algo = shift // random_number (1, 4);
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my $iv = shift // random_hex_string (16);
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my $ct = shift;
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my $keychain = shift // random_hex_string (256);
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# MD5 part
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my $nb_keys = 1 << ($algo - 1);
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my $key_len = $nb_keys * $ENC_KEY_SIZE;
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my $key = "\x00" x 16;
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my $tmp = md5 ($word);
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for (my $i = 1; $i < $ENC_DEFAULT_MD5_ITERATIONS; $i++)
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{
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$tmp = md5 ($tmp);
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$key = xor_len ($key, $tmp, 16);
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}
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my $tmp_key = $key;
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$key = "";
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for (my $i = 0; $i < $ENC_MAX_KEY_NUM; $i++)
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{
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$key .= xor_len ($tmp_key, $default_salts[$i], 16);
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}
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my $aes = Crypt::Mode::ECB->new ('AES', 0);
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my $aes_key = substr ($key, 0, $ENC_KEY_SIZE);
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## decrypt keychain using MD5 key
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my $keychain_bin = pack ("H*", $keychain);
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my @ivs_keychain;
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$ivs_keychain[0] = pack ("Q>", 0);
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for (my $i = 1; $i < $ENC_MAX_KEY_NUM; $i++)
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{
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my $next8 = substr ($key, ($ENC_MAX_KEY_NUM - $i) * $ENC_KEY_SIZE, $ENC_NONCE_SIZE); ## its strange to skip 8 byte of key material every 16 byte
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$ivs_keychain[$i] = $next8;
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}
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my $ctr_keychain;
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for (my $i = 0, my $counter = 0; $i < ($ENC_KEYCHAIN_SIZE / $ENC_BLOCK_SIZE); $i++, $counter++)
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{
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my $counter_be = pack ("Q>", $counter);
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my $tmp_iv = $ivs_keychain[0] . $counter_be;
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my $enc = $aes->encrypt ($tmp_iv, $aes_key);
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my $out = $enc;
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for (my $i = 1; $i < $ENC_MAX_KEY_NUM; $i++)
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{
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my $tmp_iv = $ivs_keychain[$i] . $counter_be;
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my $enc = $aes->encrypt ($tmp_iv, $aes_key);
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$out = xor_len ($enc, $out, $ENC_BLOCK_SIZE);
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}
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$ctr_keychain .= $out;
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}
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my $result = xor_len ($keychain_bin, $ctr_keychain, $ENC_KEYCHAIN_SIZE);
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## decrypt encrypted data using keychain key
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$aes_key = substr ($result, 0, $ENC_KEY_SIZE);
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my $iv_bin = pack ("H*", $iv);
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my @ivs;
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$ivs[0] = $iv_bin;
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for (my $i = 1; $i < $nb_keys; $i++)
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{
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my $next8 = substr ($result, $i * $ENC_KEY_SIZE, $ENC_NONCE_SIZE); ## its strange to skip 8 byte of key material every 16 byte
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$ivs[$i] = xor_len ($iv_bin, $next8, 8);
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}
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my $ctr_len = 16;
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my $ctr;
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for (my $i = 0, my $counter = 1; $i < ($ctr_len / $ENC_BLOCK_SIZE); $i++, $counter++)
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{
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my $counter_be = pack ("Q>", $counter);
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my $tmp_iv = $ivs[0] . $counter_be;
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my $enc = $aes->encrypt ($tmp_iv, $aes_key);
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my $out = $enc;
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for (my $i = 1; $i < $nb_keys; $i++)
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{
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my $tmp_iv = $ivs[$i] . $counter_be;
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my $enc = $aes->encrypt ($tmp_iv, $aes_key);
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$out = xor_len ($enc, $out, $ENC_BLOCK_SIZE);
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}
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$ctr .= $out;
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}
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my $pt_bin;
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if (defined $ct)
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{
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my $ct_bin = pack ("H*", $ct);
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$pt_bin = xor_len (substr ($ctr, 4, 4), $ct_bin, 4);
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if ($pt_bin eq "\xd2\xc3\xb4\xa1")
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{
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# ok
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}
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else
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{
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$pt_bin = "\xff\xff\xff\xff";
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}
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}
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else
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{
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$pt_bin = "\xd2\xc3\xb4\xa1";
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}
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my $ct_bin = xor_len (substr ($ctr, 4, 4), $pt_bin, 4);
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my $hash = sprintf ('$encdv$3$%d$%s$%s$%s', $algo, unpack ("H*", $iv_bin), unpack ("H*", $ct_bin), unpack ("H*", $keychain_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, $idx + 1);
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return unless substr ($hash, 0, 7) eq '$encdv$';
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my (undef, $signature, $version, $algo, $iv, $ct, $keychain) = split '\$', $hash;
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return unless defined $signature;
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return unless defined $version;
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return unless defined $algo;
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return unless defined $iv;
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return unless defined $ct;
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return unless defined $keychain;
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return unless ($version == 3);
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return unless (($algo >= 1) && ($algo <= 4));
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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, $algo, $iv, $ct, $keychain);
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return ($new_hash, $word);
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}
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sub xor_len
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{
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my $in1 = shift;
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my $in2 = shift;
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my $len = shift;
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my $out;
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for (my $i = 0; $i < $len; $i++)
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{
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$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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1;
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