Visible to Intel only — GUID: GUID-EAD93974-98EB-4F47-83FA-E9722A547BA9
Visible to Intel only — GUID: GUID-EAD93974-98EB-4F47-83FA-E9722A547BA9
ECCPPublicKey
Computes a public key from the given private key of the elliptic cryptosystem over GF(p).
Syntax
IppStatus ippsECCPPublicKey(const IppsBigNumState* pPrivate, IppsECCPPointState* pPublic, IppsECCPState* pECC);
Include Files
ippcp.h
Parameters
pPrivate |
Pointer to the private key privKey. |
pPublic |
Pointer to the public key pubKey. |
pECC |
Pointer to the context of the elliptic cryptosystem. |
Description
The function computes the public key pubKey from the given private key privKey of the elliptic cryptosystem over a finite field GF(p).
The private key privKey is a number that lies in the range of [1, n-1] where n is the order of the elliptic curve base point. The public key pubKey is an elliptic curve point such that pubKey = privKey· G, where G is the base point of the elliptic curve.
The context of the point pubKey as an elliptic curve point must be created by using the functions ECCPPointGetSize and ECCPPointInit.
The elliptic curve domain parameters must be 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 pPrivate, pPublic, or pECC is not valid. |
ippStsIvalidPrivateKey |
Indicates an error condition if the value of the private key falls outside the range of [1, n-1]. |