[#EC_POINT_dbl]
= EC_POINT_dbl
:mrdocs:

Computes the double of a EC_POINT

== Synopsis

Declared in `<openssl/ec.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EC_POINT_dbl(
    xref:EC_GROUP.adoc[EC_GROUP] const* group,
    xref:EC_POINT.adoc[EC_POINT]* r,
    xref:EC_POINT.adoc[EC_POINT] const* a,
    xref:BN_CTX.adoc[BN_CTX]* ctx);
----

== Return Value

1 on success and 0 if an error occurred

== Parameters

[cols="1,4"]
|===
| Name| Description
| *group*
| underlying EC_GROUP object
| *r*
| EC_POINT object for the result (r = 2 * a)
| *a*
| EC_POINT object
| *ctx*
| BN_CTX object (optional)
|===


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