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 X9Curve(
ECCurve curve,
byte[] seed)
{
if (curve == null)
{
throw new ArgumentNullException("curve");
}
this.curve = curve;
this.seed = Arrays.Clone(seed);
if (ECAlgorithms.IsFpCurve(curve))
{
this.fieldIdentifier = X9ObjectIdentifiers.PrimeField;
}
else if (ECAlgorithms.IsF2mCurve(curve))
{
this.fieldIdentifier = X9ObjectIdentifiers.CharacteristicTwoField;
}
else
{
throw new ArgumentException("This type of ECCurve is not implemented");
}
}
private void ImplSqrtTest(ECCurve c)
{
if (ECAlgorithms.IsFpCurve(c))
{
BigInteger p = c.Field.Characteristic;
BigInteger pMinusOne = p.Subtract(BigInteger.One);
BigInteger legendreExponent = p.ShiftRight(1);
int count = 0;
while (count < 10)
{
BigInteger nonSquare = BigIntegers.CreateRandomInRange(BigInteger.Two, pMinusOne, Random);
if (!nonSquare.ModPow(legendreExponent, p).Equals(BigInteger.One))
{
ECFieldElement root = c.FromBigInteger(nonSquare).Sqrt();
Assert.IsNull(root);
++count;
}
}
}
else if (ECAlgorithms.IsF2mCurve(c))
{
int m = c.FieldSize;
BigInteger x = new BigInteger(m, Random);
ECFieldElement fe = c.FromBigInteger(x);
for (int i = 0; i < 100; ++i)
{
ECFieldElement sq = fe.Square();
ECFieldElement check = sq.Sqrt();
Assert.AreEqual(fe, check);
fe = sq;
}
}
}
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 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 ECPoint DeserializeECPoint(byte[] ecPointFormats, ECCurve curve, byte[] encoding)
{
if (encoding == null || encoding.Length < 1)
{
throw new TlsFatalAlert(AlertDescription.illegal_parameter);
}
byte actualFormat;
switch (encoding[0])
{
case 0x02: // compressed
case 0x03: // compressed
{
if (ECAlgorithms.IsF2mCurve(curve))
{
actualFormat = ECPointFormat.ansiX962_compressed_char2;
}
else if (ECAlgorithms.IsFpCurve(curve))
{
actualFormat = ECPointFormat.ansiX962_compressed_prime;
}
else
{
throw new TlsFatalAlert(AlertDescription.illegal_parameter);
}
break;
}
case 0x04: // uncompressed
{
actualFormat = ECPointFormat.uncompressed;
break;
}
case 0x00: // infinity
case 0x06: // hybrid
case 0x07: // hybrid
default:
throw new TlsFatalAlert(AlertDescription.illegal_parameter);
}
if (actualFormat != ECPointFormat.uncompressed &&
(ecPointFormats == null || !Arrays.Contains(ecPointFormats, actualFormat)))
{
throw new TlsFatalAlert(AlertDescription.illegal_parameter);
}
return(curve.DecodePoint(encoding));
}
public static byte[] SerializeECPoint(byte[] ecPointFormats, ECPoint point)
{
ECCurve curve = point.Curve;
bool compressed = false;
if (ECAlgorithms.IsFpCurve(curve))
{
compressed = IsCompressionPreferred(ecPointFormats, 1);
}
else if (ECAlgorithms.IsF2mCurve(curve))
{
compressed = IsCompressionPreferred(ecPointFormats, 2);
}
return(point.GetEncoded(compressed));
}
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);
}
private void ImplSqrtTest(ECCurve c)
{
if (ECAlgorithms.IsFpCurve(c))
{
BigInteger p = c.Field.Characteristic;
BigInteger pMinusOne = p.Subtract(BigInteger.One);
BigInteger legendreExponent = p.ShiftRight(1);
int count = 0;
while (count < 10)
{
BigInteger nonSquare = BigIntegers.CreateRandomInRange(BigInteger.Two, pMinusOne, secRand);
if (!nonSquare.ModPow(legendreExponent, p).Equals(BigInteger.One))
{
ECFieldElement root = c.FromBigInteger(nonSquare).Sqrt();
Assert.IsNull(root);
++count;
}
}
}
}
public X9Curve(ECCurve curve, byte[] seed)
{
//IL_000e: Unknown result type (might be due to invalid IL or missing references)
//IL_0054: Unknown result type (might be due to invalid IL or missing references)
if (curve == null)
{
throw new ArgumentNullException("curve");
}
this.curve = curve;
this.seed = Arrays.Clone(seed);
if (ECAlgorithms.IsFpCurve(curve))
{
fieldIdentifier = X9ObjectIdentifiers.PrimeField;
return;
}
if (ECAlgorithms.IsF2mCurve(curve))
{
fieldIdentifier = X9ObjectIdentifiers.CharacteristicTwoField;
return;
}
throw new ArgumentException("This type of ECCurve is not implemented");
}
public static byte[] SerializeECPoint(byte[] ecPointFormats, ECPoint point)
{
ECCurve curve = point.Curve;
/*
* RFC 4492 5.7. ...an elliptic curve point in uncompressed or compressed format. Here, the
* format MUST conform to what the server has requested through a Supported Point Formats
* Extension if this extension was used, and MUST be uncompressed if this extension was not
* used.
*/
bool compressed = false;
if (ECAlgorithms.IsFpCurve(curve))
{
compressed = IsCompressionPreferred(ecPointFormats, ECPointFormat.ansiX962_compressed_prime);
}
else if (ECAlgorithms.IsF2mCurve(curve))
{
compressed = IsCompressionPreferred(ecPointFormats, ECPointFormat.ansiX962_compressed_char2);
}
return(point.GetEncoded(compressed));
}
public static ECPoint DeserializeECPoint(byte[] ecPointFormats, ECCurve curve, byte[] encoding)
{
if (encoding == null || encoding.Length < 1)
{
throw new TlsFatalAlert(47);
}
byte b;
switch (encoding[0])
{
case 2:
case 3:
if (ECAlgorithms.IsF2mCurve(curve))
{
b = 2;
}
else
{
if (!ECAlgorithms.IsFpCurve(curve))
{
throw new TlsFatalAlert(47);
}
b = 1;
}
break;
case 4:
b = 0;
break;
default:
throw new TlsFatalAlert(47);
}
if (b != 0 && (ecPointFormats == null || !Arrays.Contains(ecPointFormats, b)))
{
throw new TlsFatalAlert(47);
}
return(curve.DecodePoint(encoding));
}
public static ECPoint DeserializeECPoint(byte[] ecPointFormats, ECCurve curve, byte[] encoding)
{
byte num;
if ((encoding == null) || (encoding.Length < 1))
{
throw new TlsFatalAlert(0x2f);
}
switch (encoding[0])
{
case 2:
case 3:
if (!ECAlgorithms.IsF2mCurve(curve))
{
if (!ECAlgorithms.IsFpCurve(curve))
{
throw new TlsFatalAlert(0x2f);
}
num = 1;
}
else
{
num = 2;
}
break;
case 4:
num = 0;
break;
default:
throw new TlsFatalAlert(0x2f);
}
if ((num != 0) && ((ecPointFormats == null) || !Arrays.Contains(ecPointFormats, num)))
{
throw new TlsFatalAlert(0x2f);
}
return(curve.DecodePoint(encoding));
}
public X9ECParameters(
ECCurve curve,
X9ECPoint g,
BigInteger n,
BigInteger h,
byte[] seed)
{
this.Curve = curve;
this.BaseEntry = g;
this.N = n;
this.H = h;
this.seed = seed;
if (ECAlgorithms.IsFpCurve(curve))
{
this.FieldIDEntry = new X9FieldID(curve.Field.Characteristic);
}
else if (ECAlgorithms.IsF2mCurve(curve))
{
var field = (IPolynomialExtensionField)curve.Field;
var exponents = field.MinimalPolynomial.GetExponentsPresent();
if (exponents.Length == 3)
{
this.FieldIDEntry = new X9FieldID(exponents[2], exponents[1]);
}
else if (exponents.Length == 5)
{
this.FieldIDEntry = new X9FieldID(exponents[4], exponents[1], exponents[2], exponents[3]);
}
else
{
throw new ArgumentException("Only trinomial and pentomial curves are supported");
}
}
else
{
throw new ArgumentException("'curve' is of an unsupported type");
}
}
public static WNafPreCompInfo Precompute(ECPoint p, int width, bool includeNegated)
{
ECCurve c = p.Curve;
WNafPreCompInfo wnafPreCompInfo = GetWNafPreCompInfo(c.GetPreCompInfo(p, PRECOMP_NAME));
int iniPreCompLen = 0, reqPreCompLen = 1 << System.Math.Max(0, width - 2);
ECPoint[] preComp = wnafPreCompInfo.PreComp;
if (preComp == null)
{
preComp = EMPTY_POINTS;
}
else
{
iniPreCompLen = preComp.Length;
}
if (iniPreCompLen < reqPreCompLen)
{
preComp = ResizeTable(preComp, reqPreCompLen);
if (reqPreCompLen == 1)
{
preComp[0] = p.Normalize();
}
else
{
int curPreCompLen = iniPreCompLen;
if (curPreCompLen == 0)
{
preComp[0] = p;
curPreCompLen = 1;
}
ECFieldElement iso = null;
if (reqPreCompLen == 2)
{
preComp[1] = p.ThreeTimes();
}
else
{
ECPoint twiceP = wnafPreCompInfo.Twice, last = preComp[curPreCompLen - 1];
if (twiceP == null)
{
twiceP = preComp[0].Twice();
wnafPreCompInfo.Twice = twiceP;
/*
* For Fp curves with Jacobian projective coordinates, use a (quasi-)isomorphism
* where 'twiceP' is "affine", so that the subsequent additions are cheaper. This
* also requires scaling the initial point's X, Y coordinates, and reversing the
* isomorphism as part of the subsequent normalization.
*
* NOTE: The correctness of this optimization depends on:
* 1) additions do not use the curve's A, B coefficients.
* 2) no special cases (i.e. Q +/- Q) when calculating 1P, 3P, 5P, ...
*/
if (ECAlgorithms.IsFpCurve(c) && c.FieldSize >= 64)
{
switch (c.CoordinateSystem)
{
case ECCurve.COORD_JACOBIAN:
case ECCurve.COORD_JACOBIAN_CHUDNOVSKY:
case ECCurve.COORD_JACOBIAN_MODIFIED:
{
iso = twiceP.GetZCoord(0);
twiceP = c.CreatePoint(twiceP.XCoord.ToBigInteger(),
twiceP.YCoord.ToBigInteger());
ECFieldElement iso2 = iso.Square(), iso3 = iso2.Multiply(iso);
last = last.ScaleX(iso2).ScaleY(iso3);
if (iniPreCompLen == 0)
{
preComp[0] = last;
}
break;
}
}
}
}
while (curPreCompLen < reqPreCompLen)
{
/*
* Compute the new ECPoints for the precomputation array. The values 1, 3,
* 5, ..., 2^(width-1)-1 times p are computed
*/
preComp[curPreCompLen++] = last = last.Add(twiceP);
}
}
/*
* Having oft-used operands in affine form makes operations faster.
*/
c.NormalizeAll(preComp, iniPreCompLen, reqPreCompLen - iniPreCompLen, iso);
}
}
wnafPreCompInfo.PreComp = preComp;
if (includeNegated)
{
ECPoint[] preCompNeg = wnafPreCompInfo.PreCompNeg;
int pos;
if (preCompNeg == null)
{
pos = 0;
preCompNeg = new ECPoint[reqPreCompLen];
}
else
{
pos = preCompNeg.Length;
if (pos < reqPreCompLen)
{
preCompNeg = ResizeTable(preCompNeg, reqPreCompLen);
}
}
while (pos < reqPreCompLen)
{
preCompNeg[pos] = preComp[pos].Negate();
++pos;
}
wnafPreCompInfo.PreCompNeg = preCompNeg;
}
c.SetPreCompInfo(p, PRECOMP_NAME, wnafPreCompInfo);
return(wnafPreCompInfo);
}
public PreCompInfo Precompute(PreCompInfo existing)
{
WNafPreCompInfo existingWNaf = existing as WNafPreCompInfo;
int width = System.Math.Max(2, System.Math.Min(MAX_WIDTH, m_minWidth));
int reqPreCompLen = 1 << (width - 2);
if (CheckExisting(existingWNaf, width, reqPreCompLen, m_includeNegated))
{
existingWNaf.DecrementPromotionCountdown();
return(existingWNaf);
}
WNafPreCompInfo result = new WNafPreCompInfo();
ECCurve c = m_p.Curve;
ECPoint[] preComp = null, preCompNeg = null;
ECPoint twiceP = null;
if (null != existingWNaf)
{
int promotionCountdown = existingWNaf.DecrementPromotionCountdown();
result.PromotionCountdown = promotionCountdown;
int confWidth = existingWNaf.ConfWidth;
result.ConfWidth = confWidth;
preComp = existingWNaf.PreComp;
preCompNeg = existingWNaf.PreCompNeg;
twiceP = existingWNaf.Twice;
}
width = System.Math.Min(MAX_WIDTH, System.Math.Max(result.ConfWidth, width));
reqPreCompLen = 1 << (width - 2);
int iniPreCompLen = 0;
if (null == preComp)
{
preComp = EMPTY_POINTS;
}
else
{
iniPreCompLen = preComp.Length;
}
if (iniPreCompLen < reqPreCompLen)
{
preComp = WNafUtilities.ResizeTable(preComp, reqPreCompLen);
if (reqPreCompLen == 1)
{
preComp[0] = m_p.Normalize();
}
else
{
int curPreCompLen = iniPreCompLen;
if (curPreCompLen == 0)
{
preComp[0] = m_p;
curPreCompLen = 1;
}
ECFieldElement iso = null;
if (reqPreCompLen == 2)
{
preComp[1] = m_p.ThreeTimes();
}
else
{
ECPoint isoTwiceP = twiceP, last = preComp[curPreCompLen - 1];
if (null == isoTwiceP)
{
isoTwiceP = preComp[0].Twice();
twiceP = isoTwiceP;
/*
* For Fp curves with Jacobian projective coordinates, use a (quasi-)isomorphism
* where 'twiceP' is "affine", so that the subsequent additions are cheaper. This
* also requires scaling the initial point's X, Y coordinates, and reversing the
* isomorphism as part of the subsequent normalization.
*
* NOTE: The correctness of this optimization depends on:
* 1) additions do not use the curve's A, B coefficients.
* 2) no special cases (i.e. Q +/- Q) when calculating 1P, 3P, 5P, ...
*/
if (!twiceP.IsInfinity && ECAlgorithms.IsFpCurve(c) && c.FieldSize >= 64)
{
switch (c.CoordinateSystem)
{
case ECCurve.COORD_JACOBIAN:
case ECCurve.COORD_JACOBIAN_CHUDNOVSKY:
case ECCurve.COORD_JACOBIAN_MODIFIED:
{
iso = twiceP.GetZCoord(0);
isoTwiceP = c.CreatePoint(twiceP.XCoord.ToBigInteger(),
twiceP.YCoord.ToBigInteger());
ECFieldElement iso2 = iso.Square(), iso3 = iso2.Multiply(iso);
last = last.ScaleX(iso2).ScaleY(iso3);
if (iniPreCompLen == 0)
{
preComp[0] = last;
}
break;
}
}
}
}
while (curPreCompLen < reqPreCompLen)
{
/*
* Compute the new ECPoints for the precomputation array. The values 1, 3,
* 5, ..., 2^(width-1)-1 times p are computed
*/
preComp[curPreCompLen++] = last = last.Add(isoTwiceP);
}
}
/*
* Having oft-used operands in affine form makes operations faster.
*/
c.NormalizeAll(preComp, iniPreCompLen, reqPreCompLen - iniPreCompLen, iso);
}
}
if (m_includeNegated)
{
int pos;
if (null == preCompNeg)
{
pos = 0;
preCompNeg = new ECPoint[reqPreCompLen];
}
else
{
pos = preCompNeg.Length;
if (pos < reqPreCompLen)
{
preCompNeg = WNafUtilities.ResizeTable(preCompNeg, reqPreCompLen);
}
}
while (pos < reqPreCompLen)
{
preCompNeg[pos] = preComp[pos].Negate();
++pos;
}
}
result.PreComp = preComp;
result.PreCompNeg = preCompNeg;
result.Twice = twiceP;
result.Width = width;
return(result);
}
public static WNafPreCompInfo Precompute(ECPoint p, int width, bool includeNegated)
{
ECCurve curve = p.Curve;
WNafPreCompInfo wNafPreCompInfo = WNafUtilities.GetWNafPreCompInfo(curve.GetPreCompInfo(p, WNafUtilities.PRECOMP_NAME));
int num = 0;
int num2 = 1 << Math.Max(0, width - 2);
ECPoint[] array = wNafPreCompInfo.PreComp;
if (array == null)
{
array = WNafUtilities.EMPTY_POINTS;
}
else
{
num = array.Length;
}
if (num < num2)
{
array = WNafUtilities.ResizeTable(array, num2);
if (num2 == 1)
{
array[0] = p.Normalize();
}
else
{
int i = num;
if (i == 0)
{
array[0] = p;
i = 1;
}
ECFieldElement eCFieldElement = null;
if (num2 == 2)
{
array[1] = p.ThreeTimes();
}
else
{
ECPoint eCPoint = wNafPreCompInfo.Twice;
ECPoint eCPoint2 = array[i - 1];
if (eCPoint == null)
{
eCPoint = array[0].Twice();
wNafPreCompInfo.Twice = eCPoint;
if (ECAlgorithms.IsFpCurve(curve) && curve.FieldSize >= 64)
{
switch (curve.CoordinateSystem)
{
case 2:
case 3:
case 4:
{
eCFieldElement = eCPoint.GetZCoord(0);
eCPoint = curve.CreatePoint(eCPoint.XCoord.ToBigInteger(), eCPoint.YCoord.ToBigInteger());
ECFieldElement eCFieldElement2 = eCFieldElement.Square();
ECFieldElement scale = eCFieldElement2.Multiply(eCFieldElement);
eCPoint2 = eCPoint2.ScaleX(eCFieldElement2).ScaleY(scale);
if (num == 0)
{
array[0] = eCPoint2;
}
break;
}
}
}
}
while (i < num2)
{
eCPoint2 = (array[i++] = eCPoint2.Add(eCPoint));
}
}
curve.NormalizeAll(array, num, num2 - num, eCFieldElement);
}
}
wNafPreCompInfo.PreComp = array;
if (includeNegated)
{
ECPoint[] array2 = wNafPreCompInfo.PreCompNeg;
int j;
if (array2 == null)
{
j = 0;
array2 = new ECPoint[num2];
}
else
{
j = array2.Length;
if (j < num2)
{
array2 = WNafUtilities.ResizeTable(array2, num2);
}
}
while (j < num2)
{
array2[j] = array[j].Negate();
j++;
}
wNafPreCompInfo.PreCompNeg = array2;
}
curve.SetPreCompInfo(p, WNafUtilities.PRECOMP_NAME, wNafPreCompInfo);
return(wNafPreCompInfo);
}
public static WNafPreCompInfo Precompute(ECPoint p, int width, bool includeNegated)
{
ECCurve c = p.Curve;
WNafPreCompInfo wNafPreCompInfo = GetWNafPreCompInfo(c.GetPreCompInfo(p, PRECOMP_NAME));
int off = 0;
int length = ((int)1) << Math.Max(0, width - 2);
ECPoint[] preComp = wNafPreCompInfo.PreComp;
if (preComp == null)
{
preComp = EMPTY_POINTS;
}
else
{
off = preComp.Length;
}
if (off < length)
{
preComp = ResizeTable(preComp, length);
if (length == 1)
{
preComp[0] = p.Normalize();
}
else
{
int num3 = off;
if (num3 == 0)
{
preComp[0] = p;
num3 = 1;
}
ECFieldElement b = null;
if (length == 2)
{
preComp[1] = p.ThreeTimes();
}
else
{
ECPoint twice = wNafPreCompInfo.Twice;
ECPoint point2 = preComp[num3 - 1];
if (twice == null)
{
twice = preComp[0].Twice();
wNafPreCompInfo.Twice = twice;
if (ECAlgorithms.IsFpCurve(c) && (c.FieldSize >= 0x40))
{
switch (c.CoordinateSystem)
{
case 2:
case 3:
case 4:
{
b = twice.GetZCoord(0);
twice = c.CreatePoint(twice.XCoord.ToBigInteger(), twice.YCoord.ToBigInteger());
ECFieldElement scale = b.Square();
ECFieldElement element3 = scale.Multiply(b);
point2 = point2.ScaleX(scale).ScaleY(element3);
if (off == 0)
{
preComp[0] = point2;
}
break;
}
}
}
}
while (num3 < length)
{
preComp[num3++] = point2 = point2.Add(twice);
}
}
c.NormalizeAll(preComp, off, length - off, b);
}
}
wNafPreCompInfo.PreComp = preComp;
if (includeNegated)
{
int num5;
ECPoint[] preCompNeg = wNafPreCompInfo.PreCompNeg;
if (preCompNeg == null)
{
num5 = 0;
preCompNeg = new ECPoint[length];
}
else
{
num5 = preCompNeg.Length;
if (num5 < length)
{
preCompNeg = ResizeTable(preCompNeg, length);
}
}
while (num5 < length)
{
preCompNeg[num5] = preComp[num5].Negate();
num5++;
}
wNafPreCompInfo.PreCompNeg = preCompNeg;
}
c.SetPreCompInfo(p, PRECOMP_NAME, wNafPreCompInfo);
return(wNafPreCompInfo);
}
