[#OSSL_PARAM_get_BN]
= OSSL_PARAM_get_BN
:mrdocs:

Decode an unsigned integer OSSL_PARAM into a newly allocated BIGNUM.

== Synopsis

Declared in `<openssl/params.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
OSSL_PARAM_get_BN(
    xref:OSSL_PARAM.adoc[OSSL_PARAM] const* p,
    xref:BIGNUM.adoc[BIGNUM]** val);
----

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *p*
| Parameter holding an unsigned big‐endian integer.
| *val*
| In/out BIGNUM pointer; allocates when *`val` is NULL, else reuses it.
|===


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