[#CKey-ComputeKeyPair]
= xref:CKey.adoc[CKey]::ComputeKeyPair
:relfileprefix: ../
:mrdocs:

Compute a KeyPair

== Synopsis

Declared in `<key.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:KeyPair.adoc[KeyPair]
ComputeKeyPair(xref:uint256.adoc[uint256] const* merkle_root) const;
----

== Description

Wraps a `secp256k1_keypair` type.

`merkle_root` is used to optionally perform tweaking of the internal key, as specified in BIP341:

* If merkle_root == nullptr: no tweaking is done, use the internal key directly (this is used for signatures in BIP342 script).
* If merkle_root‐>IsNull(): tweak the internal key with H_TapTweak(pubkey) (this is used for key path spending when no scripts are present).
* Otherwise: tweak the internal key with H_TapTweak(pubkey || *merkle_root) (this is used for key path spending with the Merkle root of the script tree).

== Return Value

The computed key pair.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *merkle_root*
| Optional Merkle root controlling BIP341 tweaking (see above).
|===


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