[#BN_to_ASN1_INTEGER]
= BN_to_ASN1_INTEGER
:mrdocs:

Convert a BIGNUM to an ASN.1 INTEGER (allocating or reusing `ai).`

== Synopsis

Declared in `<openssl/asn1.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:ASN1_INTEGER.adoc[ASN1_INTEGER]*
BN_to_ASN1_INTEGER(
    xref:BIGNUM.adoc[BIGNUM] const* bn,
    xref:ASN1_INTEGER.adoc[ASN1_INTEGER]* ai);
----

== Return Value

Pointer to the INTEGER result (possibly newly allocated), or NULL on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *bn*
| Source big integer (may be negative).
| *ai*
| Existing ASN1_INTEGER to reuse, or NULL to allocate.
|===


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