[#DSA_meth_set_mod_exp]
= DSA_meth_set_mod_exp
:mrdocs:

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

== Synopsis

Declared in `<openssl/dsa.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated]]
int
DSA_meth_set_mod_exp(
    xref:DSA_METHOD-07a.adoc[DSA_METHOD]* dsam,
    int(* 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: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, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *dsam*
| Method table to update.
| *mod_exp*
| Callback performing the DSA modular exponentiation, or NULL to clear.
|===


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