[#EVP_PKEY_CTX_set_cb]
= EVP_PKEY_CTX_set_cb
:mrdocs:

Install a progress callback for key/parameter generation on a context.

== Synopsis

Declared in `<openssl/evp.h>`

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

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Key context used for keygen/paramgen.
| *cb*
| Generation callback, or NULL to clear.
|===


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