[#EVP_PKEY_CTX_set_data]
= EVP_PKEY_CTX_set_data
:mrdocs:

Attach implementation‐private data to a key context.

== Synopsis

Declared in `<openssl/evp.h>`

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

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Key context to update.
| *data*
| Opaque pointer stored on `ctx` (not freed by OpenSSL).
|===


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