public static ECDomainParameters ReadECParameters(int[] namedCurves, byte[] ecPointFormats, Stream input)
{
try
{
switch (TlsUtilities.ReadUint8(input))
{
case 1:
{
CheckNamedCurve(namedCurves, 65281);
BigInteger bigInteger3 = ReadECParameter(input);
BigInteger a2 = ReadECFieldElement(bigInteger3.BitLength, input);
BigInteger b3 = ReadECFieldElement(bigInteger3.BitLength, input);
byte[] encoding2 = TlsUtilities.ReadOpaque8(input);
BigInteger bigInteger4 = ReadECParameter(input);
BigInteger bigInteger5 = ReadECParameter(input);
ECCurve curve2 = new FpCurve(bigInteger3, a2, b3, bigInteger4, bigInteger5);
ECPoint g2 = DeserializeECPoint(ecPointFormats, curve2, encoding2);
return(new ECDomainParameters(curve2, g2, bigInteger4, bigInteger5));
}
case 2:
{
CheckNamedCurve(namedCurves, 65282);
int num = TlsUtilities.ReadUint16(input);
byte b = TlsUtilities.ReadUint8(input);
if (!ECBasisType.IsValid(b))
{
throw new TlsFatalAlert(47);
}
int num2 = ReadECExponent(num, input);
int k = -1;
int k2 = -1;
if (b == 2)
{
k = ReadECExponent(num, input);
k2 = ReadECExponent(num, input);
}
BigInteger a = ReadECFieldElement(num, input);
BigInteger b2 = ReadECFieldElement(num, input);
byte[] encoding = TlsUtilities.ReadOpaque8(input);
BigInteger bigInteger = ReadECParameter(input);
BigInteger bigInteger2 = ReadECParameter(input);
ECCurve curve = (b != 2) ? new F2mCurve(num, num2, a, b2, bigInteger, bigInteger2) : new F2mCurve(num, num2, k, k2, a, b2, bigInteger, bigInteger2);
ECPoint g = DeserializeECPoint(ecPointFormats, curve, encoding);
return(new ECDomainParameters(curve, g, bigInteger, bigInteger2));
}
case 3:
{
int namedCurve = TlsUtilities.ReadUint16(input);
if (!NamedCurve.RefersToASpecificNamedCurve(namedCurve))
{
throw new TlsFatalAlert(47);
}
CheckNamedCurve(namedCurves, namedCurve);
return(GetParametersForNamedCurve(namedCurve));
}
default:
throw new TlsFatalAlert(47);
}
IL_01ac:
ECDomainParameters result;
return(result);
}
catch (Exception alertCause)
{
throw new TlsFatalAlert(47, alertCause);
IL_01bd:
ECDomainParameters result;
return(result);
}
}
public static ECDomainParameters ReadECParameters(int[] namedCurves, byte[] ecPointFormats, Stream input)
{
try
{
byte curveType = TlsUtilities.ReadUint8(input);
switch (curveType)
{
case ECCurveType.explicit_prime:
{
CheckNamedCurve(namedCurves, NamedCurve.arbitrary_explicit_prime_curves);
BigInteger prime_p = ReadECParameter(input);
BigInteger a = ReadECFieldElement(prime_p.BitLength, input);
BigInteger b = ReadECFieldElement(prime_p.BitLength, input);
byte[] baseEncoding = TlsUtilities.ReadOpaque8(input);
BigInteger order = ReadECParameter(input);
BigInteger cofactor = ReadECParameter(input);
ECCurve curve = new FpCurve(prime_p, a, b, order, cofactor);
ECPoint basePoint = DeserializeECPoint(ecPointFormats, curve, baseEncoding);
return(new ECDomainParameters(curve, basePoint, order, cofactor));
}
case ECCurveType.explicit_char2:
{
CheckNamedCurve(namedCurves, NamedCurve.arbitrary_explicit_char2_curves);
int m = TlsUtilities.ReadUint16(input);
byte basis = TlsUtilities.ReadUint8(input);
if (!ECBasisType.IsValid(basis))
{
throw new TlsFatalAlert(AlertDescription.illegal_parameter);
}
int k1 = ReadECExponent(m, input), k2 = -1, k3 = -1;
if (basis == ECBasisType.ec_basis_pentanomial)
{
k2 = ReadECExponent(m, input);
k3 = ReadECExponent(m, input);
}
BigInteger a = ReadECFieldElement(m, input);
BigInteger b = ReadECFieldElement(m, input);
byte[] baseEncoding = TlsUtilities.ReadOpaque8(input);
BigInteger order = ReadECParameter(input);
BigInteger cofactor = ReadECParameter(input);
ECCurve curve = (basis == ECBasisType.ec_basis_pentanomial)
? new F2mCurve(m, k1, k2, k3, a, b, order, cofactor)
: new F2mCurve(m, k1, a, b, order, cofactor);
ECPoint basePoint = DeserializeECPoint(ecPointFormats, curve, baseEncoding);
return(new ECDomainParameters(curve, basePoint, order, cofactor));
}
case ECCurveType.named_curve:
{
int namedCurve = TlsUtilities.ReadUint16(input);
if (!NamedCurve.RefersToASpecificNamedCurve(namedCurve))
{
/*
* RFC 4492 5.4. All those values of NamedCurve are allowed that refer to a
* specific curve. Values of NamedCurve that indicate support for a class of
* explicitly defined curves are not allowed here [...].
*/
throw new TlsFatalAlert(AlertDescription.illegal_parameter);
}
CheckNamedCurve(namedCurves, namedCurve);
return(GetParametersForNamedCurve(namedCurve));
}
default:
throw new TlsFatalAlert(AlertDescription.illegal_parameter);
}
}
catch (Exception e)
{
throw new TlsFatalAlert(AlertDescription.illegal_parameter, e);
}
}
public static ECDomainParameters ReadECParameters(int[] namedCurves, byte[] ecPointFormats, Stream input)
{
ECDomainParameters parametersForNamedCurve;
try
{
int num2;
byte num3;
int num7;
switch (TlsUtilities.ReadUint8(input))
{
case 1:
{
CheckNamedCurve(namedCurves, 0xff01);
BigInteger q = ReadECParameter(input);
BigInteger integer2 = ReadECFieldElement(q.BitLength, input);
BigInteger integer3 = ReadECFieldElement(q.BitLength, input);
byte[] buffer = TlsUtilities.ReadOpaque8(input);
BigInteger integer4 = ReadECParameter(input);
BigInteger integer5 = ReadECParameter(input);
ECCurve curve = new FpCurve(q, integer2, integer3, integer4, integer5);
return(new ECDomainParameters(curve, DeserializeECPoint(ecPointFormats, curve, buffer), integer4, integer5));
}
case 2:
CheckNamedCurve(namedCurves, 0xff02);
num2 = TlsUtilities.ReadUint16(input);
num3 = TlsUtilities.ReadUint8(input);
if (!ECBasisType.IsValid(num3))
{
throw new TlsFatalAlert(0x2f);
}
break;
case 3:
num7 = TlsUtilities.ReadUint16(input);
if (!NamedCurve.RefersToASpecificNamedCurve(num7))
{
throw new TlsFatalAlert(0x2f);
}
goto Label_018A;
default:
throw new TlsFatalAlert(0x2f);
}
int k = ReadECExponent(num2, input);
int num5 = -1;
int num6 = -1;
if (num3 == 2)
{
num5 = ReadECExponent(num2, input);
num6 = ReadECExponent(num2, input);
}
BigInteger a = ReadECFieldElement(num2, input);
BigInteger b = ReadECFieldElement(num2, input);
byte[] encoding = TlsUtilities.ReadOpaque8(input);
BigInteger order = ReadECParameter(input);
BigInteger cofactor = ReadECParameter(input);
ECCurve curve2 = (num3 != 2) ? new F2mCurve(num2, k, a, b, order, cofactor) : new F2mCurve(num2, k, num5, num6, a, b, order, cofactor);
return(new ECDomainParameters(curve2, DeserializeECPoint(ecPointFormats, curve2, encoding), order, cofactor));
Label_018A:
CheckNamedCurve(namedCurves, num7);
parametersForNamedCurve = GetParametersForNamedCurve(num7);
}
catch (Exception exception)
{
throw new TlsFatalAlert(0x2f, exception);
}
return(parametersForNamedCurve);
}
