DESEncryptOFB

Encrypts a variable length data stream according to the DES algorithm in the OFB mode.

Syntax

IppStatus ippsDESEncryptOFB (const Ipp8u* pSrc, Ipp8u* pDst, int srclen, int ofbBlkSize, const IppsDESSpec* pCtx, Ipp8u* pIV);

Parameters

pSrc	Pointer to the input plaintext data stream of variable length.
pDst	Pointer to the resulting ciphertext data stream.
len	Length of the plaintext data stream in bytes.
ofbBlkSize	Size of the OFB block in bytes.
pCtx	Pointer to the IppsDESSpec context.
pIV	Pointer to the initialization vector for the OFB mode operation.

Description

This function is declared in the ippcp.h file. The function encrypts 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 is 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.