Identify whether group matches a built‐in named curve and return its NID.

Synopsis

Declared in <openssl/ec.h>

int
EC_GROUP_check_named_curve(
    EC_GROUP const* group,
    int nist_only,
    BN_CTX* ctx);

Return Value

Matching curve NID on success, or 0 / a negative value when no named curve matches or on error.

Parameters

Name

Description

group

Curve group to compare against known named curves.

nist_only

When non‐zero, only NIST curves are considered.

ctx

Optional BN_CTX for temporary big‐number work, or NULL.

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