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 |
pPublic |
Pointer to the public key |
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]. |