protected static function _decodeFromDER(Identifier $identifier, $data, &$offset)
{
$idx = $offset;
if (!$identifier->isPrimitive()) {
throw new DecodeException("Null value must be primitive.");
}
// null type has always zero length
Length::expectFromDER($data, $idx, 0);
$offset = $idx;
return new self();
}
/**
*
* @see \ASN1\Element::_decodeFromDER()
* @return self
*/
protected static function _decodeFromDER(Identifier $identifier, $data, &$offset)
{
$idx = $offset;
if (!$identifier->isPrimitive()) {
throw new DecodeException("DER encoded string must be primitive.");
}
$length = Length::expectFromDER($data, $idx);
$str = $length->length() ? substr($data, $idx, $length->length()) : "";
// substr should never return false, since length is
// checked by Length::expectFromDER.
assert('is_string($str)', "substr");
$offset = $idx + $length->length();
try {
return new static($str);
} catch (\InvalidArgumentException $e) {
throw new DecodeException($e->getMessage(), null, $e);
}
}