[#EVP_PKEY_get_bn_param]
= EVP_PKEY_get_bn_param
:mrdocs:

Fetch a named BIGNUM parameter from an EVP_PKEY.

== Synopsis

Declared in `<openssl/evp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EVP_PKEY_get_bn_param(
    xref:EVP_PKEY.adoc[EVP_PKEY] const* pkey,
    char const* key_name,
    xref:BIGNUM.adoc[BIGNUM]** bn);
----

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *pkey*
| Key to query.
| *key_name*
| Parameter name (OSSL_PKEY_PARAM_*).
| *bn*
| On success, set to a newly allocated BIGNUM (caller frees with BN_free()).
|===


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