Developer Reference

Contents

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].

Product and Performance Information

1

Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors. These optimizations include SSE2, SSE3, and SSSE3 instruction sets and other optimizations. Intel does not guarantee the availability, functionality, or effectiveness of any optimization on microprocessors not manufactured by Intel. Microprocessor-dependent optimizations in this product are intended for use with Intel microprocessors. Certain optimizations not specific to Intel microarchitecture are reserved for Intel microprocessors. Please refer to the applicable product User and Reference Guides for more information regarding the specific instruction sets covered by this notice.

Notice revision #20110804