[#EVP_KDF_CTX_get_kdf_size]
= EVP&lowbar;KDF&lowbar;CTX&lowbar;get&lowbar;kdf&lowbar;size
:mrdocs:

Return the output size produced by `ctx,` or SIZE&lowbar;MAX if variable&hyphen;length&period;

== Synopsis

Declared in `&lt;openssl&sol;kdf&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
size&lowbar;t
EVP&lowbar;KDF&lowbar;CTX&lowbar;get&lowbar;kdf&lowbar;size(xref:EVP_KDF_CTX.adoc[EVP&lowbar;KDF&lowbar;CTX]* ctx);
----

== Return Value

Fixed output length in bytes, 0 on error, or SIZE&lowbar;MAX when unbounded&period;

== Parameters

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


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