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schnorr: simplify some signing math

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We reuse the Bytes() function rather than duplicating its logic.
This commit is contained in:
wydengyre 2023-10-12 16:26:27 +01:00 committed by John C. Vernaleo
parent 6ea604df63
commit a4236c5010
1 changed files with 2 additions and 6 deletions
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8
btcec/schnorr/signature.go
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@ -302,13 +302,9 @@ func schnorrSign(privKey, nonce *btcec.ModNScalar, pubKey *btcec.PublicKey, hash
// Step 12.
//
// e = tagged_hash("BIP0340/challenge", bytes(R) || bytes(P) || m) mod n
var rBytes [32]byte
r := &R.X
r.PutBytesUnchecked(rBytes[:])
pBytes := SerializePubKey(pubKey)
commitment := chainhash.TaggedHash(
chainhash.TagBIP0340Challenge, rBytes[:], pBytes, hash,
chainhash.TagBIP0340Challenge, R.X.Bytes()[:], pBytes, hash,
)
var e btcec.ModNScalar
@ -324,7 +320,7 @@ func schnorrSign(privKey, nonce *btcec.ModNScalar, pubKey *btcec.PublicKey, hash
s := new(btcec.ModNScalar).Mul2(&e, privKey).Add(&k)
k.Zero()
sig := NewSignature(r, s)
sig := NewSignature(&R.X, s)
// Step 14.
//