[#EVP_PKEY_CTX_set1_hkdf_salt]
= EVP_PKEY_CTX_set1_hkdf_salt
:mrdocs:

Set the HKDF salt, replacing any previously set salt.

== Synopsis

Declared in `<openssl/kdf.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EVP_PKEY_CTX_set1_hkdf_salt(
    xref:EVP_PKEY_CTX.adoc[EVP_PKEY_CTX]* ctx,
    unsigned char const* salt,
    int saltlen);
----

== Return Value

1 on success, or a negative value on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Context configured for the HKDF KDF.
| *salt*
| Salt octets (copied), or NULL when `saltlen` is 0.
| *saltlen*
| Length of `salt` in bytes.
|===


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