[#RSA_meth_get_bn_mod_exp]
= RSA_meth_get_bn_mod_exp
:mrdocs:

Return the BN modular‐exponentiation callback from an RSA_METHOD (deprecated).

== Synopsis

Declared in `<openssl/rsa.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated]]
int(*
RSA_meth_get_bn_mod_exp(xref:RSA_METHOD.adoc[RSA_METHOD] const* meth))(xref:BIGNUM.adoc[BIGNUM]*, xref:BIGNUM.adoc[BIGNUM] const*, xref:BIGNUM.adoc[BIGNUM] const*, xref:BIGNUM.adoc[BIGNUM] const*, xref:BN_CTX.adoc[BN_CTX]*, xref:BN_MONT_CTX.adoc[BN_MONT_CTX]*);
----

[WARNING]
====
https://en.cppreference.com/cpp/language/attributes/deprecated[Deprecated^]. Use of this entity is allowed but discouraged.
====
== Return Value

Pointer to the bn_mod_exp callback, or NULL if unset.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *meth*
| Method table to query.
|===


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