SMS4DecryptCFB
SMS4DecryptCFB
Decrypts byte data stream using SMS4 block cipher in CFB mode.
Syntax
IppStatus ippsSMS4DecryptCFB(const Ipp8u*
pSrc
, Ipp8u*
pDst
, int
len
, int
cfbBlkSize
, const IppsSMS4Spec*
pCtx
, const Ipp8u*
pIV
);
Include Files
ippcp.h
Parameters
- pSrc
- Pointer to the input ciphertext data stream.
- pDst
- Pointer to the resulting plaintext data stream of variable length.
- len
- Length of the ciphertext data stream in bytes.
- cfbBlkSize
- Size of the CFB block in bytes.
- pCtx
- Pointer to theIppsSMS4Speccontext.
- pIV
- Pointer to the initialization vector for the CFB mode operation.
Description
The function decrypts the input data stream of variable length according to the CFB 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 output data stream length is less than or equal to zero.
- ippStsCFBSizeErr
- Indicates an error condition if the value forcfbBlkSizeis illegal.
- ippStsContextMatchErr
- Indicates an error condition if the context parameter does not match the operation.
- ippStsUnderRunErr
- Indicates an error condition iflenis not divisible by cipher block size.