[#OSSL_CRMF_MSG_create_popo]
= OSSL_CRMF_MSG_create_popo
:mrdocs:

Create and set the Proof‐of‐Possession field in a CRMF CertReqMsg.

== Synopsis

Declared in `<openssl/crmf.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
OSSL_CRMF_MSG_create_popo(
    int meth,
    xref:OSSL_CRMF_MSG.adoc[OSSL_CRMF_MSG]* crm,
    xref:EVP_PKEY.adoc[EVP_PKEY]* pkey,
    xref:EVP_MD.adoc[EVP_MD] const* digest,
    xref:OSSL_LIB_CTX.adoc[OSSL_LIB_CTX]* libctx,
    char const* propq);
----

== Return Value

1 on success, or 0 on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *meth*
| POPO method (OSSL_CRMF_POPO_*); see RFC 4211 section 4.
| *crm*
| CertReqMsg to update.
| *pkey*
| Private key used when `meth` is OSSL_CRMF_POPO_SIGNATURE.
| *digest*
| Digest for signature POPO; ignored for Ed25519/Ed448 keys.
| *libctx*
| Library context for algorithm fetches, or NULL for the default.
| *propq*
| Property query for algorithm fetches, or NULL.
|===


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