[#BN_bn2nativepad]
= BN_bn2nativepad
:mrdocs:

Encode a BIGNUM as a fixed‐length native‐endian unsigned byte string.

== Synopsis

Declared in `<openssl/bn.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
BN_bn2nativepad(
    xref:BIGNUM.adoc[BIGNUM] const* a,
    unsigned char* to,
    int tolen);
----

== Return Value

`tolen` on success, or ‐1 if `a` does not fit in `tolen` bytes.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *a*
| Value to encode (absolute value; sign is ignored).
| *to*
| Destination buffer of `tolen` bytes; leading zeros are written as needed.
| *tolen*
| Exact output length in bytes.
|===


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