[#BN_lshift1]
= BN_lshift1
:mrdocs:

Compute r = a << 1 (left shift by one bit), i.e. r = 2 * a.

== Synopsis

Declared in `<openssl/bn.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
BN_lshift1(
    xref:BIGNUM.adoc[BIGNUM]* r,
    xref:BIGNUM.adoc[BIGNUM] const* a);
----

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *r*
| Result BIGNUM (may alias `a).`
| *a*
| Value to shift.
|===


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