[#ASN1_dup]
= ASN1_dup
:mrdocs:

Deep‐copy an ASN.1 value by encoding with `i2d` then decoding with `d2i.`

== Synopsis

Declared in `<openssl/asn1.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void*
ASN1_dup(
    xref:i2d_of_void.adoc[i2d_of_void]* i2d,
    xref:d2i_of_void.adoc[d2i_of_void]* d2i,
    void const* x);
----

== Return Value

Newly allocated copy, or NULL on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *i2d*
| Encoder that serializes `x` to DER (or returns the required length).
| *d2i*
| Decoder that rebuilds a heap object from that DER.
| *x*
| Source object to duplicate.
|===


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