[#BN_to_montgomery]
= BN_to_montgomery
:mrdocs:

Convert `a` into the Montgomery domain for modulus `mont.`

== Synopsis

Declared in `<openssl/bn.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
BN_to_montgomery(
    xref:BIGNUM.adoc[BIGNUM]* r,
    xref:BIGNUM.adoc[BIGNUM] const* a,
    xref:BN_MONT_CTX.adoc[BN_MONT_CTX]* mont,
    xref:BN_CTX.adoc[BN_CTX]* ctx);
----

== Return Value

1 on success, or 0 on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *r*
| Destination for aR mod m.
| *a*
| Value to convert (typically reduced modulo m).
| *mont*
| Montgomery context initialized for modulus m.
| *ctx*
| BN_CTX for temporary storage.
|===


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