Set_BN

Defines the sign and value of the context.

Syntax

IppStatus ippsSet_BN(IppsBigNumSGN sgn, int length, const Ipp32u *data, IppsBigNumState *x);

Parameters

sgn	Sign of IppsBigNumState * x.
length	Array length of the input data.
data	Data array.
x	On output, the context IppsBigNumState updated with the input data.

Description

This function is declared in the ippcp.h file. The function defines the sign and value for IppsBigNumState *x with the specified inputs IppsBigNumSGN sgn and const Ipp32u *data.

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 length is less than or equal to 0.
ippStsOutOfRangeErr	Indicates an error condition if length is more than the size of IppsBigNumState *x.
ippStsBadArgErr	Indicates an error condition if the big number is set to zero with the negative sign.

Create a Big Number

IppsBigNumState* New_BN(int size, const Ipp32u* pData=0){

   // get the size of the Big Number context

   int ctxSize;

   ippsBigNumGetSize(size, &ctxSize);

   // allocate the Big Number context

   IppsBigNumState* pBN = (IppsBigNumState*) (new Ipp8u [ctxSize] );

   // and initialize one

   ippsBigNumInit(size, pBN);

   // if any data was supplied, then set up the Big Number value

   if(pData)

      ippsSet_BN(IppsBigNumPOS, size, pData, pBN);

   // return pointer to the Big Number context for future use

   return pBN;