[#BN_MONT_CTX_copy]
= BN_MONT_CTX_copy
:mrdocs:

Copy Montgomery context `from` into `to.`

== Synopsis

Declared in `<openssl/bn.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:BN_MONT_CTX.adoc[BN_MONT_CTX]*
BN_MONT_CTX_copy(
    xref:BN_MONT_CTX.adoc[BN_MONT_CTX]* to,
    xref:BN_MONT_CTX.adoc[BN_MONT_CTX]* from);
----

== Return Value

`to` on success, or NULL on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *to*
| Destination context (must already be allocated).
| *from*
| Source context to duplicate.
|===


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