[#BN_bn2bin]
= BN_bn2bin
:mrdocs:

Encode the absolute value of `a` as a minimal big‐endian unsigned byte string.

== Synopsis

Declared in `<openssl/bn.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
BN_bn2bin(
    xref:BIGNUM.adoc[BIGNUM] const* a,
    unsigned char* to);
----

== Return Value

Number of bytes written.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *a*
| Value to encode (sign is ignored).
| *to*
| Destination buffer of at least BN_num_bytes(`a)` bytes.
|===


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