[#BN_lshift]
= BN_lshift
:mrdocs:

Compute r = a << n (left shift by `n` bits).

== Synopsis

Declared in `<openssl/bn.h>`

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

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *r*
| Result BIGNUM.
| *a*
| Value to shift.
| *n*
| Number of bits to shift (non‐negative).
|===


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