[#BN_bn2hex]
= BN_bn2hex
:mrdocs:

Convert a BIGNUM to a newly allocated hexadecimal string.

== Synopsis

Declared in `<openssl/bn.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
char*
BN_bn2hex(xref:BIGNUM.adoc[BIGNUM] const* a);
----

== Return Value

Heap string (free with OPENSSL_free()), or NULL on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *a*
| Value to convert.
|===


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