Developer Reference

Contents

AESDecryptOFB

Decrypts a variable length data stream according to AES in the OFB mode.

Syntax

IppStatus ippsAESDecryptOFB (const Ipp8u*
pSrc
, Ipp8u*
pDst
, int
srclen
, int
ofbBlkSize
, const IppsAESSpec*
pCtx
, Ipp8u*
pIV
);
Include Files
ippcp.h
Parameters
pSrc
Pointer to the input ciphertext data stream of variable length.
pDst
Pointer to the resulting plaintext data stream.
srclen
Length of the ciphertext data stream in bytes.
ofbBlkSize
Size of the OFB block in bytes.
pCtx
Pointer to the
IppsAESSpec
context.
pIV
Pointer to the initialization vector for the OFB mode operation.
Description
The function decrypts the input data stream of a variable length in the OFB mode as specified in [NIST SP 800-38A].
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
.
ippStsLengthErr
Indicates an error condition if the input data stream length is less than or equal to zero.
ippStsUnderRunErr
Indicates an error condition if
srclen
i
s not divisible by the
ofbBlkSize
parameter value.
ippStsOFBSizeErr
Indicates an error condition if the value of
ofbBlkSize
is illegal.
ippStsContextMatchErr
Indicates an error condition if the context parameter does not match the operation.

Product and Performance Information

1

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