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

SigningProvider wrapper for LegacyDataSPKM that does not provide private keys.

== Synopsis

Declared in `<wallet/scriptpubkeyman.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
class LegacySigningProvider
    : public xref:SigningProvider.adoc[SigningProvider]
----

== Base Classes

[cols="1,4"]
|===
| Name| Description
| `xref:SigningProvider.adoc[SigningProvider]`
| An interface to be implemented by keystores that support signing.
|===

== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:wallet/LegacySigningProvider/2constructor.adoc[`LegacySigningProvider`]         [.small]#[constructor]#
| Construct a signing provider wrapping the given legacy spkm.
| xref:SigningProvider/DeleteMuSig2Session.adoc[`DeleteMuSig2Session`]  [.small]#[virtual]#
| Delete the state stored for a MuSig2 signing session.
| xref:SigningProvider/GetAllMuSig2ParticipantPubkeys.adoc[`GetAllMuSig2ParticipantPubkeys`]  [.small]#[virtual]#
| Return all known MuSig2 aggregate pubkeys and their participants.
| xref:wallet/LegacySigningProvider/GetCScript.adoc[`GetCScript`]  [.small]#[virtual]#
| Retrieves the redeem script for the given script id.
| xref:wallet/LegacySigningProvider/GetKey.adoc[`GetKey`]  [.small]#[virtual]#
| Always returns false, since this provider never exposes private keys.
| xref:SigningProvider/GetKeyByXOnly.adoc[`GetKeyByXOnly`] 
| Look up a private key by any key id derived from an x‐only pubkey.
| xref:wallet/LegacySigningProvider/GetKeyOrigin.adoc[`GetKeyOrigin`]  [.small]#[virtual]#
| Retrieves the key origin (derivation path and fingerprint) for the given key id.
| xref:SigningProvider/GetKeyOriginByXOnly.adoc[`GetKeyOriginByXOnly`] 
| Look up key origin info by any key id derived from an x‐only pubkey.
| xref:SigningProvider/GetMuSig2ParticipantPubkeys.adoc[`GetMuSig2ParticipantPubkeys`]  [.small]#[virtual]#
| Return the MuSig2 participant pubkeys for an aggregate pubkey.
| xref:SigningProvider/GetMuSig2SecNonce.adoc[`GetMuSig2SecNonce`]  [.small]#[virtual]#
| Retrieve the MuSig2 secret nonce for a signing session.
| xref:wallet/LegacySigningProvider/GetPubKey.adoc[`GetPubKey`]  [.small]#[virtual]#
| Retrieves the public key for the given address.
| xref:SigningProvider/GetPubKeyByXOnly.adoc[`GetPubKeyByXOnly`] 
| Look up a public key by any key id derived from an x‐only pubkey.
| xref:SigningProvider/GetTaprootBuilder.adoc[`GetTaprootBuilder`]  [.small]#[virtual]#
| Look up the Taproot builder for an output key.
| xref:SigningProvider/GetTaprootSpendData.adoc[`GetTaprootSpendData`]  [.small]#[virtual]#
| Look up the Taproot spend data for an output key.
| xref:wallet/LegacySigningProvider/HaveCScript.adoc[`HaveCScript`]  [.small]#[virtual]#
| Returns whether the redeem script for the given script id is held.
| xref:wallet/LegacySigningProvider/HaveKey.adoc[`HaveKey`]  [.small]#[virtual]#
| Always returns false, since this provider never exposes private keys.
| xref:SigningProvider/SetMuSig2SecNonce.adoc[`SetMuSig2SecNonce`]  [.small]#[virtual]#
| Store a MuSig2 secret nonce for a signing session.
|===


== Non-Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:GetKeyForDestination.adoc[`::GetKeyForDestination`]
| Return the CKeyID of the key involved in a script (if there is a unique one).
| xref:IsSegWitOutput.adoc[`::IsSegWitOutput`]
| Check whether a scriptPubKey is known to be segwit.
| xref:ProduceSignature.adoc[`::ProduceSignature`]
| Produce a script signature using a generic signature creator.
| xref:SignPSBTInput.adoc[`::SignPSBTInput`]
| Signs a PSBTInput, verifying that all provided data matches what is being signed.
| xref:UpdatePSBTOutput.adoc[`::UpdatePSBTOutput`]
| Updates a PSBTOutput with information from provider.
|===


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