[#OSSL_PARAM_BLD_push_BN]
= OSSL&lowbar;PARAM&lowbar;BLD&lowbar;push&lowbar;BN
:mrdocs:

Append a BIGNUM parameter by reference (must remain valid until OSSL&lowbar;PARAM&lowbar;BLD&lowbar;to&lowbar;param())&period;

== Synopsis

Declared in `&lt;openssl&sol;param&lowbar;build&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
OSSL&lowbar;PARAM&lowbar;BLD&lowbar;push&lowbar;BN(
    xref:OSSL_PARAM_BLD.adoc[OSSL&lowbar;PARAM&lowbar;BLD]* bld,
    char const* key,
    xref:BIGNUM.adoc[BIGNUM] const* bn);
----

== Return Value

1 on success, or 0 on error (including negative `bn)&period;`

== Parameters

[cols="1,4"]
|===
| Name| Description
| *bld*
| Parameter builder&period;
| *key*
| Parameter name string&period;
| *bn*
| Non&hyphen;negative BIGNUM to store&semi; secure BIGNUMs yield secure OSSL&lowbar;PARAM storage&period;
|===


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