[#BN_mod_lshift_quick]
= BN_mod_lshift_quick
:mrdocs:

Left‐shift then reduce quickly: `r` = (`a` << `n)` mod `m` (assumes 0 <= a < m).

== Synopsis

Declared in `<openssl/bn.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
BN_mod_lshift_quick(
    xref:BIGNUM.adoc[BIGNUM]* r,
    xref:BIGNUM.adoc[BIGNUM] const* a,
    int n,
    xref:BIGNUM.adoc[BIGNUM] const* m);
----

== Return Value

1 on success, or 0 on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *r*
| Destination.
| *a*
| Value already reduced modulo `m.`
| *n*
| Number of bits to shift left (non‐negative).
| *m*
| Modulus.
|===


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