[#CreateMuSig2PartialSig]
= CreateMuSig2PartialSig
:mrdocs:

Produce this participant's MuSig2 partial signature for the session.

== Synopsis

Declared in `<musig.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
std::optional<uint256>
CreateMuSig2PartialSig(
    xref:uint256.adoc[uint256] const& hash,
    xref:CKey.adoc[CKey] const& our_seckey,
    xref:CPubKey.adoc[CPubKey] const& aggregate_pubkey,
    std::vector<CPubKey> const& pubkeys,
    std::map<CPubKey, std::vector<uint8_t>> const& pubnonces,
    xref:MuSig2SecNonce.adoc[MuSig2SecNonce]& secnonce,
    std::vector<std::pair<uint256, bool>> const& tweaks);
----

== Return Value

This participant's partial signature, or std::nullopt on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *hash*
| The signature hash being signed.
| *our_seckey*
| This participant's secret key.
| *aggregate_pubkey*
| The aggregate public key of all participants.
| *pubkeys*
| The participant public keys, in aggregation order.
| *pubnonces*
| The public nonces from all participants, keyed by public key.
| *secnonce*
| This participant's secret nonce for the session.
| *tweaks*
| The tweaks to apply to the aggregate key, each with a flag selecting x‐only or ordinary tweaking.
|===


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