[#BN_mod_lshift1_quick]
= BN_mod_lshift1_quick
:mrdocs:

Compute r = (a << 1) mod m, assuming 0 <= a < m.

== Synopsis

Declared in `<openssl/bn.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
BN_mod_lshift1_quick(
    xref:BIGNUM.adoc[BIGNUM]* r,
    xref:BIGNUM.adoc[BIGNUM] const* a,
    xref:BIGNUM.adoc[BIGNUM] const* m);
----

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *r*
| Destination for the result (may alias `a).`
| *a*
| Value to double then reduce; must already be reduced modulo `m.`
| *m*
| Modulus; must be positive.
|===


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