Developer Guide and Reference for Intel® Integrated Performance Primitives Cryptography
GFpECSetSubgroup
Sets up the parameters defining an elliptic curve points subgroup.
Syntax
IppStatus ippsGFpECSetSubGroup(const IppsGFpElement* pX, const IppsGFpElement* pY, const IppsBigNumState* pOrder, const IppsBigNumState* pCofactor, IppsGFpECState* pEC);
Include Files
ippcp.h
Parameters
| pX, pY | Pointers to the X and Y coordinates of the base point of the elliptic curve. | 
| pOrder | Pointer to the big number context storing the order of the base point. | 
| pCofactor | Pointer to the big number context storing the cofactor. | 
| pEC | Pointer to the context of the elliptic curve. | 
Description
This function sets up an elliptic curve as the subgroup generated by the base point over the finite field.
Return Values
| ippStsNoErr | Indicates no error. Any other value indicates an error or warning. | 
| ippStsNullPtrErr | Indicates an error condition if pEC is NULL. | 
| ippStsContextMatchErr | Indicates an error condition in the following cases: 
 | 
| ippStsBadArgErr | Indicates an error condition if any of the specified IppsBigNumState contexts defines zero or a negative number. | 
| ippStsOutOfRangeErr | Indicates an error if the base point coordinates (pX, pY) do not belong to the finite field over which the elliptic curve is initialized. | 
| ippStsRangeErr | Indicates an error condition in the following cases: 
 |