[#EVP_PKEY_gen_cb]
= EVP_PKEY_gen_cb
:mrdocs:

Callback type invoked during key or parameter generation to report progress or cancel.

== Synopsis

Declared in `<openssl/evp.h>`

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

== Return Value

Nonzero to continue, or 0 to abort generation with an error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Generation context; query progress via EVP_PKEY_CTX_get_keygen_info().
|===


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