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signrpc: add schnorr sig to sign and validate msg

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This commit is contained in:
ErikEk
2022-06-23 15:35:29 +02:00
committed by Oliver Gugger
parent 9d568cc119
commit b5af0ce327
8 changed files with 449 additions and 213 deletions
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32
keychain/btcwallet.go
View File

@@ -6,7 +6,9 @@ import (
"github.com/btcsuite/btcd/btcec/v2"
"github.com/btcsuite/btcd/btcec/v2/ecdsa"
"github.com/btcsuite/btcd/btcec/v2/schnorr"
"github.com/btcsuite/btcd/chaincfg/chainhash"
"github.com/btcsuite/btcd/txscript"
"github.com/btcsuite/btcwallet/waddrmgr"
"github.com/btcsuite/btcwallet/wallet"
"github.com/btcsuite/btcwallet/walletdb"
@@ -452,3 +454,33 @@ func (b *BtcWalletKeyRing) SignMessageCompact(keyLoc KeyLocator,
}
return ecdsa.SignCompact(privKey, digest, true)
}
// SignMessageSchnorr uses the Schnorr signature algorithm to sign the given
// message, single or double SHA256 hashing it first, with the private key
// described in the key locator and the optional tweak applied to the private
// key.
//
// NOTE: This is part of the keychain.MessageSignerRing interface.
func (b *BtcWalletKeyRing) SignMessageSchnorr(keyLoc KeyLocator,
msg []byte, doubleHash bool, taprootTweak []byte) (*schnorr.Signature,
error) {
privKey, err := b.DerivePrivKey(KeyDescriptor{
KeyLocator: keyLoc,
})
if err != nil {
return nil, err
}
if len(taprootTweak) > 0 {
privKey = txscript.TweakTaprootPrivKey(privKey, taprootTweak)
}
var digest []byte
if doubleHash {
digest = chainhash.DoubleHashB(msg)
} else {
digest = chainhash.HashB(msg)
}
return schnorr.Sign(privKey, digest)
}

8
keychain/derivation.go
View File

@@ -5,6 +5,7 @@ import (
"github.com/btcsuite/btcd/btcec/v2"
"github.com/btcsuite/btcd/btcec/v2/ecdsa"
"github.com/btcsuite/btcd/btcec/v2/schnorr"
)
const (
@@ -234,6 +235,13 @@ type MessageSignerRing interface {
// format.
SignMessageCompact(keyLoc KeyLocator, msg []byte,
doubleHash bool) ([]byte, error)
// SignMessageSchnorr signs the given message, single or double SHA256
// hashing it first, with the private key described in the key locator
// and the optional Taproot tweak applied to the private key.
SignMessageSchnorr(keyLoc KeyLocator, msg []byte,
doubleHash bool, taprootTweak []byte) (*schnorr.Signature,
error)
}
// SingleKeyMessageSigner is an abstraction interface that hides the