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 the IppsSMS4Spec context. |
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 is NULL. |
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 for cfbBlkSize is illegal. |
ippStsContextMatchErr |
Indicates an error condition if the context parameter does not match the operation. |
ippStsUnderRunErr |
Indicates an error condition if len is not divisible by cipher block size. |