public Key Uncover(Key scan, PubKey ephem)
{
AssertNotDiposed();
#if HAS_SPAN
Span <byte> tmp = stackalloc byte[33];
ephem.ECKey.GetSharedPubkey(scan._ECKey).WriteToSpan(true, tmp, out _);
var c = NBitcoinContext.Instance.CreateECPrivKey(Hashes.SHA256(tmp));
var priv = c.sec + this._ECKey.sec;
return(new Key(this._ECKey.ctx.CreateECPrivKey(priv), this.IsCompressed));
#else
var curve = ECKey.Secp256k1;
var priv = new BigInteger(1, PubKey.GetStealthSharedSecret(scan, ephem))
.Add(new BigInteger(1, this.ToBytes()))
.Mod(curve.N)
.ToByteArrayUnsigned();
if (priv.Length < 32)
{
priv = new byte[32 - priv.Length].Concat(priv).ToArray();
}
var key = new Key(priv, fCompressedIn: this.IsCompressed);
return(key);
#endif
}
public Key Uncover(Key scan, PubKey ephem)
{
var curve = ECKey.Secp256k1;
var priv = new BigInteger(1, PubKey.GetStealthSharedSecret(scan, ephem))
.Add(new BigInteger(1, this.ToBytes()))
.Mod(curve.N)
.ToByteArrayUnsigned();
if (priv.Length < 32)
{
priv = new byte[32 - priv.Length].Concat(priv).ToArray();
}
var key = new Key(priv, fCompressedIn: this.IsCompressed);
return(key);
}