[#CExtKey-2constructor-0e]
= xref:CExtKey.adoc[CExtKey]::CExtKey
:relfileprefix: ../
:mrdocs:

Construct an extended key from an extended public key's metadata and a private key.

== Synopsis

Declared in `<key.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
CExtKey(
    xref:CExtPubKey.adoc[CExtPubKey] const& xpub,
    xref:CKey.adoc[CKey] const& key_in);
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *xpub*
| The extended public key providing depth, fingerprint, child index and chain code.
| *key_in*
| The private key material.
|===


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