Cryptography for Intel® Integrated Performance Primitives Developer Reference

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

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.