[#OCSP_RESPID_set_by_key_ex]
= OCSP_RESPID_set_by_key_ex
:mrdocs:

Set a ResponderID to the SHA‐1 hash of `cert's` public key, with provider selection.

== Synopsis

Declared in `<openssl/ocsp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
OCSP_RESPID_set_by_key_ex(
    xref:OCSP_RESPID.adoc[OCSP_RESPID]* respid,
    xref:X509.adoc[X509]* cert,
    xref:OSSL_LIB_CTX.adoc[OSSL_LIB_CTX]* libctx,
    char const* propq);
----

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *respid*
| ResponderID to update.
| *cert*
| Certificate whose public key is hashed for the byKey identity.
| *libctx*
| Library context for algorithm fetches, or NULL for the default.
| *propq*
| Property query for provider selection, or NULL.
|===


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