[#EVP_PKEY_CTX_add1_hkdf_info]
= EVP_PKEY_CTX_add1_hkdf_info
:mrdocs:

Append octets to the HKDF info/context parameter on a PKEY HKDF context.

== Synopsis

Declared in `<openssl/kdf.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EVP_PKEY_CTX_add1_hkdf_info(
    xref:EVP_PKEY_CTX.adoc[EVP_PKEY_CTX]* ctx,
    unsigned char const* info,
    int infolen);
----

== Return Value

1 on success, or a negative value on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Key derivation context configured for HKDF.
| *info*
| Additional info bytes to append (copied).
| *infolen*
| Length of `info` in bytes.
|===


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