Developer Reference

Contents

DESPack, DESUnpack

Packs/unpacks the
IppsDESSpec
context into/from a user-defined buffer (deprecated).

Syntax

IppStatus ippsDESPack (const IppsDESSpec*
pCtx
, Ipp8u*
pBuffer
);
IppStatus ippsDESUnpack (const Ipp8u*
pBuffer
, IppsDESSpec*
pCtx
);
Include Files
ippcp.h
Parameters
pCtx
Pointer to the
IppsDESSpec
context.
pBuffer
Pointer to the user-defined buffer.
Description
This algorithm is considered weak due to known attacks on it. The functionality remains in the library, but the implementation will no longer be optimized and no security patches will be applied. A more secure alternative is available: AES.
The
DESPack
function transforms the
*pCtx
context to a position-independent form and stores it in the
*pBuffer
buffer. The
DESUnpack
function performs the inverse operation, that is, transforms the contents of the
*pBuffer
buffer into a normal
IppsDESSpec
context. The
DESPack
and
DESUnpack
functions enable replacing the position-dependent
IppsDESSpec
context in the memory.
Call the
DESGetSize
function prior to
DESPack
/
DESUnpack
to determine the size of the buffer.
Return Values
ippStsNoErr
Indicates no error. Any other value indicates an error or warning.
ippStsNullPtrErr
Indicates an error condition if any of the specified pointers is
NULL
.
ippStsContextMatchErr
Indicates an error condition if the
pCtx
pointer does not contain the
IppsDESSpec
context.

Product and Performance Information

1

Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors. These optimizations include SSE2, SSE3, and SSSE3 instruction sets and other optimizations. Intel does not guarantee the availability, functionality, or effectiveness of any optimization on microprocessors not manufactured by Intel. Microprocessor-dependent optimizations in this product are intended for use with Intel microprocessors. Certain optimizations not specific to Intel microarchitecture are reserved for Intel microprocessors. Please refer to the applicable product User and Reference Guides for more information regarding the specific instruction sets covered by this notice.

Notice revision #20110804