|
public static SerializeECPoint ( byte ecPointFormats, |
||
| ecPointFormats | byte | |
| point | ||
| return | byte[] | |
public static void WriteExplicitECParameters(byte[] ecPointFormats, ECDomainParameters ecParameters, Stream output)
{
ECCurve curve = ecParameters.Curve;
if (ECAlgorithms.IsFpCurve(curve))
{
TlsUtilities.WriteUint8(1, output);
TlsEccUtilities.WriteECParameter(curve.Field.Characteristic, output);
}
else
{
if (!ECAlgorithms.IsF2mCurve(curve))
{
throw new ArgumentException("'ecParameters' not a known curve type");
}
IPolynomialExtensionField polynomialExtensionField = (IPolynomialExtensionField)curve.Field;
int[] exponentsPresent = polynomialExtensionField.MinimalPolynomial.GetExponentsPresent();
TlsUtilities.WriteUint8(2, output);
int i = exponentsPresent[exponentsPresent.Length - 1];
TlsUtilities.CheckUint16(i);
TlsUtilities.WriteUint16(i, output);
if (exponentsPresent.Length == 3)
{
TlsUtilities.WriteUint8(1, output);
TlsEccUtilities.WriteECExponent(exponentsPresent[1], output);
}
else
{
if (exponentsPresent.Length != 5)
{
throw new ArgumentException("Only trinomial and pentomial curves are supported");
}
TlsUtilities.WriteUint8(2, output);
TlsEccUtilities.WriteECExponent(exponentsPresent[1], output);
TlsEccUtilities.WriteECExponent(exponentsPresent[2], output);
TlsEccUtilities.WriteECExponent(exponentsPresent[3], output);
}
}
TlsEccUtilities.WriteECFieldElement(curve.A, output);
TlsEccUtilities.WriteECFieldElement(curve.B, output);
TlsUtilities.WriteOpaque8(TlsEccUtilities.SerializeECPoint(ecPointFormats, ecParameters.G), output);
TlsEccUtilities.WriteECParameter(ecParameters.N, output);
TlsEccUtilities.WriteECParameter(ecParameters.H, output);
}
public static void WriteECPoint(byte[] ecPointFormats, ECPoint point, Stream output)
{
TlsUtilities.WriteOpaque8(TlsEccUtilities.SerializeECPoint(ecPointFormats, point), output);
}
public static byte[] SerializeECPublicKey(byte[] ecPointFormats, ECPublicKeyParameters keyParameters)
{
return(TlsEccUtilities.SerializeECPoint(ecPointFormats, keyParameters.Q));
}