[#EVP_PKEY_CTX_set1_hkdf_key]
= EVP_PKEY_CTX_set1_hkdf_key
:mrdocs:

Set the HKDF input keying material (IKM) on a PKEY KDF context.

== Synopsis

Declared in `<openssl/kdf.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EVP_PKEY_CTX_set1_hkdf_key(
    xref:EVP_PKEY_CTX.adoc[EVP_PKEY_CTX]* ctx,
    unsigned char const* key,
    int keylen);
----

== Return Value

1 on success, or a negative value on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Context configured for the HKDF KDF.
| *key*
| Input keying material bytes (copied).
| *keylen*
| Length of `key` in bytes.
|===


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