function randomlyEncryptECBorCBC($data)
{
$key = getRandomBytes(16);
$pad1 = getRandomBytes(rand(5, 10));
$pad2 = getRandomBytes(rand(5, 10));
if (rand(0, 1)) {
return encryptAES128CBC("{$pad1}{$data}{$pad2}", $key, getRandomBytes(16));
}
return encryptAES128ECB("{$pad1}{$data}{$pad2}", $key);
}
function encryptedProfileFor($email, $key)
{
return encryptAES128ECB(profileFor($email), $key);
}
{
$blocks = str_split($data, 16);
foreach ($blocks as &$block) {
$block = _decryptAES128ECB($block, $key);
}
$plaintext = implode($blocks);
try {
return removePKCS7Padding($plaintext);
} catch (Exception $e) {
if ($strictPadding) {
throw $e;
}
return $plaintext;
}
}
// don't output if we're included into another script.
if (!debug_backtrace()) {
$encrypted = base64_decode(file_get_contents('07-data.txt'));
$key = 'YELLOW SUBMARINE';
$decryptedSane = removePKCS7Padding(_decryptAES128ECB($encrypted, $key));
$decrypted = decryptAES128ECB($encrypted, $key);
print "Sanity check:\n";
$sanity = $decryptedSane === $decrypted;
print $sanity ? "Success!\n\n" : "Failure :(\n\n";
print "Homebrew sanity check:\n";
$test = '0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef';
$sanity = decryptAES128ECB(encryptAES128ECB($test, $key), $key) === $test;
print $sanity ? "Success!\n\n" : "Failure :(\n\n";
print "Decrypted data:\n";
print "{$decrypted}\n";
}
