[#OSSL_HPKE_CTX_set1_psk]
= OSSL_HPKE_CTX_set1_psk
:mrdocs:

Set the pre‐shared key and PSK identifier for PSK / PSKAUTH modes.

== Synopsis

Declared in `<openssl/hpke.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
OSSL_HPKE_CTX_set1_psk(
    xref:OSSL_HPKE_CTX.adoc[OSSL_HPKE_CTX]* ctx,
    char const* pskid,
    unsigned char const* psk,
    size_t psklen);
----

== Return Value

1 on success, or 0 on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| HPKE context on sender or receiver (call before encap/decap).
| *pskid*
| NUL‐terminated PSK identity string (non‐NULL when a PSK is used).
| *psk*
| PSK bytes (non‐NULL; length at least OSSL_HPKE_MIN_PSKLEN).
| *psklen*
| Length of `psk` in bytes.
|===


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