public BigInt GenPriv(RandomNumberGenerator rng)
{
EllipticCurve.BigInt priv = null;
do
{
if (priv != null)
{
priv.Clear();
}
var bytes = new byte[curveByteLen];
rng.GetBytes(bytes);
var byteMask = (1 << (curveLen & 7)) - 1;
if (byteMask != 0)
{
bytes[0] &= (byte)byteMask;
}
priv = new EllipticCurve.BigInt(bytes, 0, bytes.Length);
Utils.ClearArray(bytes);
} while (priv >= p || priv.IsZero());
return(priv);
}
HandshakeType SendClientKeyExchangeEcdh(ref int offset)
{
var pkParameters = _handshakeData.CertList[0].GetKeyAlgorithmParameters();
var pkKey = _handshakeData.CertList[0].GetPublicKey();
var curve = EllipticCurve.GetCurveFromParameters(pkParameters);
if (curve == null)
SendAlertFatal(AlertDescription.IllegalParameter);
var Qax = new EllipticCurve.BigInt(pkKey, 1, curve.curveByteLen);
var Qay = new EllipticCurve.BigInt(pkKey, 1 + curve.curveByteLen, curve.curveByteLen);
byte[] preMasterSecret;
EllipticCurve.Affine publicPoint;
curve.Ecdh(Qax, Qay, _rng, out preMasterSecret, out publicPoint);
SetMasterSecret(preMasterSecret);
_buf[offset++] = (byte)(1 + 2 * curve.curveByteLen); // Point length
_buf[offset++] = 4; // Uncompressed
offset += publicPoint.x.ExportToBigEndian(_buf, offset, curve.curveByteLen);
offset += publicPoint.y.ExportToBigEndian(_buf, offset, curve.curveByteLen);
publicPoint.Clear();
return HandshakeType.ClientKeyExchange;
}
public BigInt GenPriv(RandomNumberGenerator rng)
{
EllipticCurve.BigInt priv = null;
do
{
if (priv != null)
priv.Clear();
var bytes = new byte[curveByteLen];
rng.GetBytes(bytes);
var byteMask = (1 << (curveLen & 7)) - 1;
if (byteMask != 0)
bytes[0] &= (byte)byteMask;
priv = new EllipticCurve.BigInt(bytes, 0, bytes.Length);
Utils.ClearArray(bytes);
} while (priv >= p || priv.IsZero());
return priv;
}
