[#EVP_PKEY_CTX_get_ecdh_cofactor_mode]
= EVP_PKEY_CTX_get_ecdh_cofactor_mode
:mrdocs:

Get the ECDH cofactor mode from a key context.

== Synopsis

Declared in `<openssl/ec.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EVP_PKEY_CTX_get_ecdh_cofactor_mode(xref:EVP_PKEY_CTX.adoc[EVP_PKEY_CTX]* ctx);
----

== Return Value

Cofactor mode (0 = disable, 1 = enable, ‐1 = use key default), or a negative error code.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Key context configured for ECDH.
|===


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