[#BN_copy]
= BN_copy
:mrdocs:

Copy BIGNUM `b` into `a,` resizing `a` as needed.

== Synopsis

Declared in `<openssl/bn.h>`

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

== Return Value

`a` on success, or NULL on allocation failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *a*
| Destination (must be non‐NULL).
| *b*
| Source value.
|===


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