[#EC_POINT_point2bn]
= EC_POINT_point2bn
:mrdocs:

Encode an EC point as a BIGNUM holding the SEC1 octet form (deprecated).

== Synopsis

Declared in `<openssl/ec.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated]]
xref:BIGNUM.adoc[BIGNUM]*
EC_POINT_point2bn(
    xref:EC_GROUP.adoc[EC_GROUP] const* group,
    xref:EC_POINT.adoc[EC_POINT] const* point,
    point_conversion_form_t form,
    xref:BIGNUM.adoc[BIGNUM]* bn,
    xref:BN_CTX.adoc[BN_CTX]* ctx);
----

[WARNING]
====
https://en.cppreference.com/cpp/language/attributes/deprecated[Deprecated^]. Use of this entity is allowed but discouraged.
====
== Return Value

Pointer to the result BIGNUM (same as `bn` when non‐NULL), or NULL on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *group*
| Curve that defines `point.`
| *point*
| Point to encode.
| *form*
| Conversion form passed to EC_POINT_point2oct().
| *bn*
| Optional BIGNUM to reuse for the result, or NULL to allocate one.
| *ctx*
| BN_CTX for temporary values, or NULL.
|===


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