TDESEncryptCTR

Encrypts a variable length data stream in the CTR mode.

Syntax

IppStatus ippsTDESEncryptCTR(const Ipp8u *pSrc, Ipp8u *pDst, int srclen, const IppsDESSpec *pCtx1, const IppsDESSpec *pCtx2, const IppsDESSpec *pCtx3,Ipp8u *pCtrValue, int ctrNumBitSize);

Parameters

pSrc	Input plaintext data stream of a variable length.
pDst	Resulting ciphertext data stream.
srclen	Input data stream length in bytes.
pCtx1	First set of round keys scheduled for TDES internal operations.
pCtx2	Second set of round keys scheduled for TDES internal operations.
pCtx3	Third set of round keys scheduled for TDES internal operations.
pCtrValue	Counter.
ctrNumBitSize	Number of bits in the specific part of the counter to be incremented.

Description

This function is declared in the ippcp.h file. The function encrypts the input data stream of a variable length according to the cipher scheme specified in the [NIST SP 800-38A] recommendation. The function uses three sets of the supplied round keys. The standard incrementing function is applied to increment counter value. The function returns the ciphertext result.

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 that or equal to zero.
ippStsCTRSizeErr	Indicates an error condition if the value of the ctrNumBitSize is illegal.
ippStsContextMatchErr	Indicates an error condition if the context parameter does not match the operation.