/*
* Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017,
* 2018
* Jonathan Schleifer <js@heap.zone>
*
* All rights reserved.
*
* This file is part of ObjFW. It may be distributed under the terms of the
* Q Public License 1.0, which can be found in the file LICENSE.QPL included in
* the packaging of this file.
*
* Alternatively, it may be distributed under the terms of the GNU General
* Public License, either version 2 or 3, which can be found in the file
* LICENSE.GPLv2 or LICENSE.GPLv3 respectively included in the packaging of this
* file.
*/
#import "OFData.h"
OF_ASSUME_NONNULL_BEGIN
/*!
* @class OFSecureData OFSecureData.h ObjFW/OFSecureData.h
*
* @brief A class for storing arbitrary data in secure memory, securely wiping
* it when it gets deallocated.
*
* @note Secure memory might be unavailable on the platform, in which case this
* falls back to insecure (potentially swappable) memory.
*/
@interface OFSecureData: OFData
{
struct page *_page;
}
#ifdef OF_HAVE_CLASS_PROPERTIES
@property (class, readonly, nonatomic, getter=isSecure) bool secure;
#endif
/*!
* @brief Whether OFSecureData is secure, meaning preventing the data from
* being swapped out is supported.
*/
+ (bool)isSecure;
/*!
* @brief Preallocates the specified number of bytes.
*
* This is useful to allocate secure memory before enabling a sandbox that does
* not allow it anymore.
*
* @note This may only be called once per thread!
* @note Preallocated memory is only available for OFSecureData that is smaller
* than a single page!
*
* @param size The number of bytes to preallocate
*/
+ (void)preallocateMemoryWithSize: (size_t)size;
/*!
* @brief Creates a new, autoreleased OFSecureData with count items of item
* size 1, all set to zero.
*
* @param count The number of zero items the OFSecureData should contain
* @return A new, autoreleased OFSecureData
*/
+ (instancetype)dataWithCount: (size_t)count;
/*!
* @brief Creates a new, autoreleased OFSecureData with count items of the
* specified item size, all set to zero.
*
* @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 A new, autoreleased OFSecureData
*/
+ (instancetype)dataWithItemSize: (size_t)itemSize
count: (size_t)count;
#ifdef OF_HAVE_FILES
+ (instancetype)dataWithContentsOfFile: (OFString *)path OF_UNAVAILABLE;
#endif
+ (instancetype)dataWithContentsOfURL: (OFURL *)URL OF_UNAVAILABLE;
+ (instancetype)dataWithStringRepresentation: (OFString *)string OF_UNAVAILABLE;
+ (instancetype)dataWithBase64EncodedString: (OFString *)string OF_UNAVAILABLE;
+ (instancetype)dataWithSerialization: (OFXMLElement *)element OF_UNAVAILABLE;
/*!
* @brief Initializes an already allocated OFSecureData with count items of
* item size 1, all set to zero.
*
* @param count The number of zero items the OFSecureData should contain
* @return An initialized OFSecureData
*/
- (instancetype)initWithCount: (size_t)count;
/*!
* @brief Initializes an already allocated OFSecureData with count items of the
* specified item size, all set to zero.
*
* @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;
#endif
- (instancetype)initWithContentsOfURL: (OFURL *)URL OF_UNAVAILABLE;
- (instancetype)initWithStringRepresentation: (OFString *)string OF_UNAVAILABLE;
- (instancetype)initWithBase64EncodedString: (OFString *)string OF_UNAVAILABLE;
- (instancetype)initWithSerialization: (OFXMLElement *)element OF_UNAVAILABLE;
- (OFString *)stringRepresentation OF_UNAVAILABLE;
- (OFString *)stringByBase64Encoding OF_UNAVAILABLE;
#ifdef OF_HAVE_FILES
- (void)writeToFile: (OFString *)path OF_UNAVAILABLE;
#endif
- (void)writeToURL: (OFURL *)URL OF_UNAVAILABLE;
- (OFXMLElement *)XMLElementBySerializing OF_UNAVAILABLE;
- (OFData *)messagePackRepresentation OF_UNAVAILABLE;
@end
@interface OFSecureData (MutableRetrieving)
/* GCC does not like overriding properties with a different type. */
#if defined(__clang__) || defined(DOXYGEN)
/*!
* @brief All items of the OFSecureData as a C array.
*
* Modifying the returned array directly is allowed and will change the contents
* of the data.
*/
@property (readonly, nonatomic) void *items OF_RETURNS_INNER_POINTER;
/*!
* @brief The first item of the OFSecureData or `NULL`.
*
* Modifying the returned item directly is allowed and will change the contents
* of the data.
*/
@property OF_NULLABLE_PROPERTY (readonly, nonatomic) void *firstItem
OF_RETURNS_INNER_POINTER;
/*!
* @brief Last item of the OFSecureData or `NULL`.
*
* Modifying the returned item directly is allowed and will change the contents
* of the data.
*/
@property OF_NULLABLE_PROPERTY (readonly, nonatomic) void *lastItem
OF_RETURNS_INNER_POINTER;
#else
- (void *)items;
- (nullable void *)firstItem;
- (nullable void *)lastItem;
#endif
/*!
* @brief Returns a specific item of the OFSecureData.
*
* Modifying the returned item directly is allowed and will change the contents
* of the data array.
*
* @param index The number of the item to return
* @return The specified item of the OFSecureData
*/
- (void *)itemAtIndex: (size_t)index OF_RETURNS_INNER_POINTER;
@end
OF_ASSUME_NONNULL_END