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GFpECGet

Extracts the parameters of an elliptic curve over a finite field from the context.

Syntax

IppStatus ippsGFpECGet(IppsGFpState** const ppGF, IppsGFpElement* pA, IppsGFpElement* pB, const IppsGFpECState* pEC);

Include Files

ippcp.h

Parameters

ppGF

Double pointer to the context of the elliptic curve underlying finite field.

pA

Pointer to a copy of the coefficient A of the equation defining the elliptic curve.

pB

Pointer to a copy of the coefficient B of the equation defining the elliptic curve.

pEC

Pointer to the context of the elliptic curve.

Description

This function extracts parameters of the elliptic curve from the input IppsGFpECState context. You can get any combination of the following parameters: a reference to the underlying field and copies of the A and B coefficients. To turn off extraction of a particular parameter of the elliptic curve, set the appropriate function parameter to NULL.

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:

  • IppsGFpECState context parameter does not match the operation.

  • Either pA or pB is not zero and the corresponding context parameter does not match the operation.

ippStsOutOfRangeErr

Indicates an error if either pA or pB does not belong to the finite field over which the elliptic curve is initialized.

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GFpECInitStd

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GFpECGetSubgroup