[#EVP_KDF_fetch]
= EVP_KDF_fetch
:mrdocs:

Fetch a key‐derivation algorithm implementation from providers.

== Synopsis

Declared in `<openssl/kdf.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:EVP_KDF.adoc[EVP_KDF]*
EVP_KDF_fetch(
    xref:OSSL_LIB_CTX.adoc[OSSL_LIB_CTX]* libctx,
    char const* algorithm,
    char const* properties);
----

== Return Value

Fetched EVP_KDF with refcount 1, or NULL on error; free with EVP_KDF_free().

== Parameters

[cols="1,4"]
|===
| Name| Description
| *libctx*
| Library context, or NULL for the default.
| *algorithm*
| KDF name such as "HKDF" or "PBKDF2".
| *properties*
| Optional provider property query, or NULL.
|===


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