public X9ECParameters(ECCurve curve, X9ECPoint g, BigInteger n, BigInteger h, byte[] seed)
{
this.curve = curve;
this.g = g;
this.n = n;
this.h = h;
this.seed = seed;
if (ECAlgorithms.IsFpCurve(curve))
{
this.fieldID = new X9FieldID(curve.Field.Characteristic);
}
else
{
if (!ECAlgorithms.IsF2mCurve(curve))
{
throw new ArgumentException("'curve' is of an unsupported type");
}
IPolynomialExtensionField field = (IPolynomialExtensionField)curve.Field;
int[] exponentsPresent = field.MinimalPolynomial.GetExponentsPresent();
if (exponentsPresent.Length == 3)
{
this.fieldID = new X9FieldID(exponentsPresent[2], exponentsPresent[1]);
}
else
{
if (exponentsPresent.Length != 5)
{
throw new ArgumentException("Only trinomial and pentomial curves are supported");
}
this.fieldID = new X9FieldID(exponentsPresent[4], exponentsPresent[1], exponentsPresent[2], exponentsPresent[3]);
}
}
}
public X9ECParameters(ECCurve curve, X9ECPoint g, BigInteger n, BigInteger h, byte[] seed)
{
//IL_00a5: Unknown result type (might be due to invalid IL or missing references)
//IL_00b0: Unknown result type (might be due to invalid IL or missing references)
this.curve = curve;
this.g = g;
this.n = n;
this.h = h;
this.seed = seed;
if (ECAlgorithms.IsFpCurve(curve))
{
fieldID = new X9FieldID(curve.Field.Characteristic);
return;
}
if (ECAlgorithms.IsF2mCurve(curve))
{
IPolynomialExtensionField polynomialExtensionField = (IPolynomialExtensionField)curve.Field;
int[] exponentsPresent = polynomialExtensionField.MinimalPolynomial.GetExponentsPresent();
if (exponentsPresent.Length == 3)
{
fieldID = new X9FieldID(exponentsPresent[2], exponentsPresent[1]);
return;
}
if (exponentsPresent.Length == 5)
{
fieldID = new X9FieldID(exponentsPresent[4], exponentsPresent[1], exponentsPresent[2], exponentsPresent[3]);
return;
}
throw new ArgumentException("Only trinomial and pentomial curves are supported");
}
throw new ArgumentException("'curve' is of an unsupported type");
}
public DSTU4145ECBinary(ECDomainParameters paramsValue)
{
ECCurve curve = paramsValue.Curve;
if (!ECAlgorithms.IsF2mCurve(curve))
{
throw new ArgumentException("only binary domain is possible");
}
// We always use big-endian in parameter encoding
IPolynomialExtensionField field = (IPolynomialExtensionField)curve.Field;
int[] exponents = field.MinimalPolynomial.GetExponentsPresent();
if (exponents.Length == 3)
{
f = new DSTU4145BinaryField(exponents[2], exponents[1]);
}
else if (exponents.Length == 5)
{
f = new DSTU4145BinaryField(exponents[4], exponents[1], exponents[2], exponents[3]);
}
else
{
throw new ArgumentException("curve must have a trinomial or pentanomial basis");
}
a = new DerInteger(curve.A.ToBigInteger());
b = new DerOctetString(curve.B.GetEncoded());
n = new DerInteger(paramsValue.N);
bp = new DerOctetString(DSTU4145PointEncoder.encodePoint(paramsValue.G));
}
public static void WriteExplicitECParameters(byte[] ecPointFormats, ECDomainParameters ecParameters,
Stream output)
{
ECCurve curve = ecParameters.Curve;
if (ECAlgorithms.IsFpCurve(curve))
{
TlsUtilities.WriteUint8(ECCurveType.explicit_prime, output);
WriteECParameter(curve.Field.Characteristic, output);
}
else if (ECAlgorithms.IsF2mCurve(curve))
{
IPolynomialExtensionField field = (IPolynomialExtensionField)curve.Field;
int[] exponents = field.MinimalPolynomial.GetExponentsPresent();
TlsUtilities.WriteUint8(ECCurveType.explicit_char2, output);
int m = exponents[exponents.Length - 1];
TlsUtilities.CheckUint16(m);
TlsUtilities.WriteUint16(m, output);
if (exponents.Length == 3)
{
TlsUtilities.WriteUint8(ECBasisType.ec_basis_trinomial, output);
WriteECExponent(exponents[1], output);
}
else if (exponents.Length == 5)
{
TlsUtilities.WriteUint8(ECBasisType.ec_basis_pentanomial, output);
WriteECExponent(exponents[1], output);
WriteECExponent(exponents[2], output);
WriteECExponent(exponents[3], output);
}
else
{
throw new ArgumentException("Only trinomial and pentomial curves are supported");
}
}
else
{
throw new ArgumentException("'ecParameters' not a known curve type");
}
WriteECFieldElement(curve.A, output);
WriteECFieldElement(curve.B, output);
TlsUtilities.WriteOpaque8(SerializeECPoint(ecPointFormats, ecParameters.G), output);
WriteECParameter(ecParameters.N, output);
WriteECParameter(ecParameters.H, output);
}
public static void WriteExplicitECParameters(byte[] ecPointFormats, ECDomainParameters ecParameters, Stream output)
{
//IL_00b2: Unknown result type (might be due to invalid IL or missing references)
//IL_00bd: Unknown result type (might be due to invalid IL or missing references)
ECCurve curve = ecParameters.Curve;
if (ECAlgorithms.IsFpCurve(curve))
{
TlsUtilities.WriteUint8(1, output);
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);
WriteECExponent(exponentsPresent[1], output);
}
else
{
if (exponentsPresent.Length != 5)
{
throw new ArgumentException("Only trinomial and pentomial curves are supported");
}
TlsUtilities.WriteUint8(2, output);
WriteECExponent(exponentsPresent[1], output);
WriteECExponent(exponentsPresent[2], output);
WriteECExponent(exponentsPresent[3], output);
}
}
WriteECFieldElement(curve.A, output);
WriteECFieldElement(curve.B, output);
TlsUtilities.WriteOpaque8(SerializeECPoint(ecPointFormats, ecParameters.G), output);
WriteECParameter(ecParameters.N, output);
WriteECParameter(ecParameters.H, output);
}
