public ECPubKey Tweak(ReadOnlySpan <byte> tweak32)
{
if (processed_nonce)
{
throw new InvalidOperationException("This function can only be called before MusigContext.Process");
}
if (is_tweaked)
{
throw new InvalidOperationException("This function can only be called once");
}
if (tweak32.Length != 32)
{
throw new ArgumentException(nameof(tweak32), "The tweak should have a size of 32 bytes");
}
scalar_tweak = new Scalar(tweak32, out int overflow);
if (overflow == 1)
{
throw new ArgumentException(nameof(tweak32), "The tweak is overflowing");
}
var output = aggregatePubKey.AddTweak(tweak32);
internal_key_parity = pk_parity;
pk_parity = output.Q.y.IsOdd;
is_tweaked = true;
tweakedPubKey = output;
return(output);
}
