Add_BN

Developer Reference for Intel® Integrated Performance Primitives Cryptography

Adds two integer big numbers.

Syntax

IppStatus ippsAdd_BN(IppsBigNumState *pA, IppsBigNumState *pB, IppsBigNumState * pR);

Include Files

ippcp.h

Parameters

pA	Pointer to the first integer big number of the data type IppsBigNumState.
pB	Pointer to the second integer big number of the data type IppsBigNumState.
pR	Pointer to the addition result.

Description

The function adds two integer big numbers regardless of their signs and sizes and returns the result of the operation.

The following pseudocode represents this function:

(*pR) ← (*pA) + (*pB).

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.
ippStsOutOfRangeErr	Indicates an error condition if the size of pR is smaller than the resulting data length.
ippStsContextMatchErr	Indicates an error condition if any of the context parameters does not match the operation.

Note

The function executes only under the condition that size of IppsBigNumState *pR is not less than either the length of IppsBigNumState *pA or that of IppsBigNumState *pB.

Example

The code example below adds big numbers.

void Add_BN_sample(void){
   // define and set up Big Number A
   const Ipp32u bnuA[] = {0x01234567,0x9abcdeff,0x11223344};
   IppsBigNumState* bnA = New_BN(sizeof(bnuA)/sizeof(Ipp32u));
   // define and set up Big Number B
   const Ipp32u bnuB[] = {0x76543210,0xfedcabee,0x44332211};
   IppsBigNumState* bnB = New_BN(sizeof(bnuB)/sizeof(Ipp32u), bnuB);
   // define Big Number R
   int sizeR = max(sizeof(bnuA), sizeof(bnuB));
   IppsBigNumState* bnR = New_BN(1+sizeR/sizeof(Ipp32u));
   // R = A+B
   ippsAdd_BN(bnA, bnB, bnR);
   // type R
   Type_BN("R=A+B:\n", bnR);
   delete [] (Ipp8u*)bnA;
   delete [] (Ipp8u*)bnB;
   delete [] (Ipp8u*)bnR;
}