[#BN_signed_bn2bin]
= BN_signed_bn2bin
:mrdocs:

Encode a signed BIGNUM as big‐endian two's‐complement of fixed width.

== Synopsis

Declared in `<openssl/bn.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
BN_signed_bn2bin(
    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 (may be negative).
| *to*
| Destination buffer of `tolen` bytes.
| *tolen*
| Fixed output width in bytes.
|===


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