Adds two integer big numbers.
Syntax
IppStatus ippsAdd_BN(IppsBigNumState *a, IppsBigNumState *b, IppsBigNumState * r);
Parameters
a |
First integer big number of the data type IppsBigNumState. |
b |
Second integer big number of the data type IppsBigNumState. |
r |
Addition result. |
Description
This function is declared in the ippcp.h file. 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:
(*r) ← (*a) + (*b).
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 r is smaller than the resulting data length. |
Note
The function executes only under the condition that size of IppsBigNumState * r is not less than either the length of IppsBigNumState *a or that of IppsBigNumState *b.
Add 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;
}