[#DSA_meth_set_bn_mod_exp]
= DSA_meth_set_bn_mod_exp
:mrdocs:

Set the modular‐exponentiation callback on a custom DSA_METHOD (deprecated).

== Synopsis

Declared in `<openssl/dsa.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated]]
int
DSA_meth_set_bn_mod_exp(
    xref:DSA_METHOD-07a.adoc[DSA_METHOD]* dsam,
    int(* bn_mod_exp)(xref:DSA.adoc[DSA]*, 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

1 on success.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *dsam*
| Method object to update.
| *bn_mod_exp*
| Callback computing r = aˆp mod m (with optional Montgomery ctx), or NULL.
|===


[.small]#Created with https://www.mrdocs.com[MrDocs]#