INNER CODE UNIT · Go

computeBlindingFactor

lightningnetwork/lightning-onion · crypto.go:167

func computeBlindingFactor(hopPubKey *btcec.PublicKey,
	hopSharedSecret []byte) btcec.ModNScalar {

	sha := sha256.New()
	sha.Write(hopPubKey.SerializeCompressed())
	sha.Write(hopSharedSecret)

	var hash Hash256
	copy(hash[:], sha.Sum(nil))

	var blindingBytes btcec.ModNScalar
	blindingBytes.SetByteSlice(hash[:])

	return blindingBytes
}

// blindGroupElement blinds the group element P by performing scalar
// multiplication of the group element by blindingFactor: blindingFactor * P.

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