[#wallet-CWallet-GetExtKey]
= xref:wallet.adoc[wallet]::xref:wallet/CWallet.adoc[CWallet]::GetExtKey
:relfileprefix: ../../
:mrdocs:

Reconstruct the extended private key for an HD xpub. Returns nullopt when no descriptor has the private key, or the wallet is locked.

== Synopsis

Declared in `<wallet/wallet.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
std::optional<CExtKey>
GetExtKey(xref:CExtPubKey.adoc[CExtPubKey] const& xpub) const;
----

== Return Value

The extended private key, or nullopt if unavailable.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *xpub*
| The extended public key to reconstruct the private key for.
|===


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