[#EVP_KDF_CTX_get_kdf_size]
= EVP_KDF_CTX_get_kdf_size
:mrdocs:

Return the output size produced by `ctx,` or SIZE_MAX if variable‐length.

== Synopsis

Declared in `<openssl/kdf.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
size_t
EVP_KDF_CTX_get_kdf_size(xref:EVP_KDF_CTX.adoc[EVP_KDF_CTX]* ctx);
----

== Return Value

Fixed output length in bytes, 0 on error, or SIZE_MAX when unbounded.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| KDF context to query.
|===


[.small]#Created with https://www.mrdocs.com[MrDocs]#