ObjFW  Check-in [68c8c02e80]

 * @param itemSize The size of a single item in the OFSecureData in bytes
 * @param count The number of zero items the OFSecureData should contain
 * @return An initialized OFSecureData
 */
- (instancetype)initWithItemSize: (size_t)itemSize
			   count: (size_t)count;

/*!
 * @brief Checks the OFSecureData for equality to another object.
 *
 * If the specified object is a subclass of @ref OFData, the comparison is
 * performed in constant time.
 *
 * @param object The object which should be tested for equality
 * @return A boolean whether the OFSecureData is equal to the specified object
 */
- (bool)isEqual: (nullable id)object;

/*!
 * @brief Zeroes the data.
 */
- (void)zero;

#ifdef OF_HAVE_FILES
- (instancetype)initWithContentsOfFile: (OFString *)path OF_UNAVAILABLE;

- (id)mutableCopy
{
	return [[OFSecureData alloc] initWithItems: _items
					  itemSize: _itemSize
					     count: _count];
}

- (bool)isEqual: (id)object
{
	OFData *otherData;
	unsigned char diff;

	if (![object isKindOfClass: [OFData class]])
		return false;

	otherData = object;

	if (otherData->_count != _count || otherData->_itemSize != _itemSize)
		return false;

	diff = 0;

	for (size_t i = 0; i < _count * _itemSize; i++)
		diff |= otherData->_items[i] ^ _items[i];

	return (diff == 0);
}

- (OFString *)description
{
	return @"<OFSecureData>";
}

- (OFString *)stringRepresentation