private static FiniteFieldPoint AdjustPoint(int totalPoints, FiniteFieldPoint point)
{
var correction = new FiniteFieldPolynomial(point.Y.PrimePolynomial, BigInteger.One);
var correctionMultiplier = point.X;
for (int i = 1; i <= totalPoints; i++)
{
correction = correction * correctionMultiplier;
}
var newY = point.Y + correction;
return new FiniteFieldPoint(point.X, newY);
}
private static FiniteFieldPoint AdjustPoint(int totalPoints, FiniteFieldPoint point)
{
var correction = new FiniteFieldPolynomial(point.Y.PrimePolynomial, BigInteger.One);
var correctionMultiplier = point.X;
for (int i = 1; i <= totalPoints; i++)
{
correction = correction * correctionMultiplier;
}
var newY = point.Y + correction;
return(new FiniteFieldPoint(point.X, newY));
}
public static bool TryParse(string s, out FiniteFieldPoint result)
{
var match = Regex.Match(s, @"(?<x>[0-9]+)-(?<y>[0-9a-fA-F]+)");
if (!match.Success)
{
result = null;
return false;
}
try
{
var xString = match.Groups["x"].Value.ToLowerInvariant();
var yString = match.Groups["y"].Value.ToLowerInvariant();
// Each hex letter makes up 4 bits, so to get the degree in bits
// we multiply by 4
int polynomialDegree = yString.Length * 4;
var irp = new IrreduciblePolynomial(polynomialDegree);
var x = new FiniteFieldPolynomial(irp, BigInteger.Parse(xString));
// get bytes
var bigEndianBytes = new byte[yString.Length / 2];
for (int i = 0; i < yString.Length; i += 2)
{
bigEndianBytes[i / 2] = Byte.Parse(yString.Substring(i, 2), NumberStyles.HexNumber);
}
var y = new FiniteFieldPolynomial(irp, bigEndianBytes.ToBigIntegerFromBigEndianUnsignedBytes());
result = new FiniteFieldPoint(x, y);
return true;
}
catch
{
result = null;
return false;
}
}
public static bool TryParse(string s, out FiniteFieldPoint result)
{
var match = Regex.Match(s, @"(?<x>[0-9]+)-(?<y>[0-9a-fA-F]+)");
if (!match.Success)
{
result = null;
return(false);
}
try
{
var xString = match.Groups["x"].Value.ToLowerInvariant();
var yString = match.Groups["y"].Value.ToLowerInvariant();
// Each hex letter makes up 4 bits, so to get the degree in bits
// we multiply by 4
int polynomialDegree = yString.Length * 4;
var irp = new IrreduciblePolynomial(polynomialDegree);
var x = new FiniteFieldPolynomial(irp, BigInteger.Parse(xString));
// get bytes
var bigEndianBytes = new byte[yString.Length / 2];
for (int i = 0; i < yString.Length; i += 2)
{
bigEndianBytes[i / 2] = Byte.Parse(yString.Substring(i, 2), NumberStyles.HexNumber);
}
var y = new FiniteFieldPolynomial(irp, bigEndianBytes.ToBigIntegerFromBigEndianUnsignedBytes());
result = new FiniteFieldPoint(x, y);
return(true);
}
catch
{
result = null;
return(false);
}
}
