|
public static ReadECParameter ( Stream input ) : |
||
| input | Stream | |
| return | ||
public static int ReadECExponent(int fieldSize, Stream input)
{
BigInteger bigInteger = TlsEccUtilities.ReadECParameter(input);
if (bigInteger.BitLength < 32)
{
int intValue = bigInteger.IntValue;
if (intValue > 0 && intValue < fieldSize)
{
return(intValue);
}
}
throw new TlsFatalAlert(47);
}
public static ECDomainParameters ReadECParameters(int[] namedCurves, byte[] ecPointFormats, Stream input)
{
ECDomainParameters result;
try
{
switch (TlsUtilities.ReadUint8(input))
{
case 1:
{
TlsEccUtilities.CheckNamedCurve(namedCurves, 65281);
BigInteger bigInteger = TlsEccUtilities.ReadECParameter(input);
BigInteger a = TlsEccUtilities.ReadECFieldElement(bigInteger.BitLength, input);
BigInteger b = TlsEccUtilities.ReadECFieldElement(bigInteger.BitLength, input);
byte[] encoding = TlsUtilities.ReadOpaque8(input);
BigInteger bigInteger2 = TlsEccUtilities.ReadECParameter(input);
BigInteger bigInteger3 = TlsEccUtilities.ReadECParameter(input);
ECCurve curve = new FpCurve(bigInteger, a, b, bigInteger2, bigInteger3);
ECPoint g = TlsEccUtilities.DeserializeECPoint(ecPointFormats, curve, encoding);
result = new ECDomainParameters(curve, g, bigInteger2, bigInteger3);
break;
}
case 2:
{
TlsEccUtilities.CheckNamedCurve(namedCurves, 65282);
int num = TlsUtilities.ReadUint16(input);
byte b2 = TlsUtilities.ReadUint8(input);
if (!ECBasisType.IsValid(b2))
{
throw new TlsFatalAlert(47);
}
int num2 = TlsEccUtilities.ReadECExponent(num, input);
int k = -1;
int k2 = -1;
if (b2 == 2)
{
k = TlsEccUtilities.ReadECExponent(num, input);
k2 = TlsEccUtilities.ReadECExponent(num, input);
}
BigInteger a2 = TlsEccUtilities.ReadECFieldElement(num, input);
BigInteger b3 = TlsEccUtilities.ReadECFieldElement(num, input);
byte[] encoding2 = TlsUtilities.ReadOpaque8(input);
BigInteger bigInteger4 = TlsEccUtilities.ReadECParameter(input);
BigInteger bigInteger5 = TlsEccUtilities.ReadECParameter(input);
ECCurve curve2 = (b2 == 2) ? new F2mCurve(num, num2, k, k2, a2, b3, bigInteger4, bigInteger5) : new F2mCurve(num, num2, a2, b3, bigInteger4, bigInteger5);
ECPoint g2 = TlsEccUtilities.DeserializeECPoint(ecPointFormats, curve2, encoding2);
result = new ECDomainParameters(curve2, g2, bigInteger4, bigInteger5);
break;
}
case 3:
{
int namedCurve = TlsUtilities.ReadUint16(input);
if (!NamedCurve.RefersToASpecificNamedCurve(namedCurve))
{
throw new TlsFatalAlert(47);
}
TlsEccUtilities.CheckNamedCurve(namedCurves, namedCurve);
result = TlsEccUtilities.GetParametersForNamedCurve(namedCurve);
break;
}
default:
throw new TlsFatalAlert(47);
}
}
catch (Exception alertCause)
{
throw new TlsFatalAlert(47, alertCause);
}
return(result);
}