[#OSSL_PARAM_BLD_push_BN]
= OSSL_PARAM_BLD_push_BN
:mrdocs:

Append a BIGNUM parameter by reference (must remain valid until OSSL_PARAM_BLD_to_param()).

== Synopsis

Declared in `<openssl/param_build.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
OSSL_PARAM_BLD_push_BN(
    xref:OSSL_PARAM_BLD.adoc[OSSL_PARAM_BLD]* bld,
    char const* key,
    xref:BIGNUM.adoc[BIGNUM] const* bn);
----

== Return Value

1 on success, or 0 on error (including negative `bn).`

== Parameters

[cols="1,4"]
|===
| Name| Description
| *bld*
| Parameter builder.
| *key*
| Parameter name string.
| *bn*
| Non‐negative BIGNUM to store; secure BIGNUMs yield secure OSSL_PARAM storage.
|===


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