[#BN_bn2lebinpad]
= BN_bn2lebinpad
:mrdocs:

Encode a BIGNUM as fixed‐length little‐endian unsigned bytes with zero padding.

== Synopsis

Declared in `<openssl/bn.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
BN_bn2lebinpad(
    xref:BIGNUM.adoc[BIGNUM] const* a,
    unsigned char* to,
    int tolen);
----

== Return Value

`tolen` on success, or ‐1 if `tolen` is too small or on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *a*
| Value to encode (absolute value; sign is ignored).
| *to*
| Destination buffer of `tolen` bytes.
| *tolen*
| Required output length; must be large enough for `a.`
|===


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