SMS4DecryptOFB
SMS4DecryptOFB
Decrypts a variable length data stream using SMS4 block cipher in the OFB mode.
Syntax
IppStatus ippsSMS4DecryptOFB (const Ipp8u*
pSrc
, Ipp8u*
pDst
, int
len
, int
ofbBlkSize
, const IppsSMS4Spec*
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.
- len
- Length of the ciphertext data stream in bytes.
- ofbBlkSize
- Size of the OFB block in bytes.
- pCtx
- Pointer to theIppsSMS4Speccontext.
- 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 isNULL.
- ippStsLengthErr
- Indicates an error condition if the input data stream length is less than or equal to zero.
- ippStsUnderRunErr
- Indicates an error condition iflenis not divisible by theofbBlkSizeparameter value.
- ippStsOFBSizeErr
- Indicates an error condition if the value ofofbBlkSizeis illegal.
- ippStsContextMatchErr
- Indicates an error condition if the context parameter does not match the operation.