ECCPGet¶
Retrieves elliptic curve domain parameters over GF(p).
Syntax¶
IppStatus ippsECCPGet(IppsBigNumState* pPrime, IppsBigNumState* pA, IppsBigNumState* pB, IppsBigNumState* pGX,IppsBigNumState* pGY, IppsBigNumState* pOrder, int* cofactor, IppsECCPState* pECC);
Include Files¶
ippcp.h
Parameters¶
pPrime |
Pointer to the characteristic |
pA |
Pointer to the coefficient A of the equation defining the elliptic curve. |
pB |
Pointer to the coefficient B of the equation defining the elliptic curve. |
pGX |
Pointer to the x-coordinate of the elliptic curve base point. |
pGY |
Pointer to the y-coordinate of the elliptic curve base point. |
pOrder |
Pointer to the order n of the elliptic curve base point. |
cofactor |
Pointer to the cofactor h. |
pECC |
Pointer to the context of the cryptosystem. |
Description¶
The function retrieves elliptic curve domain parameters from the context of the elliptic cryptosystem over a finite field GF(p) and allocates them in accordance with the pointers pPrime, pA, pB, pGX, pGY, pOrder, and cofactor. The elliptic curve domain parameters must be hitherto defined by one of the functions: ECCPSet or ECCPSetStd.
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. |
ippStsContextMatchErr |
Indicates an error condition if one of the contexts pointed by pPrime, pA, pB, pGX, pGY, pOrder, or pECC is not valid. |
ippStsRangeErr |
Indicates an error condition if the memory size of one of the parameters pointed by pPrime, pA, pB, pGX, pGY, pOrder, and pECC is less than the value of feBitSize in the ECCPInit function. |