private static BigIntegerPoint GetPoint(StreamReader file, CurveType curveType)
{
var xRaw = file.ReadLine();
var yRaw = file.ReadLine();
BigInteger x;
BigInteger y;
if (xRaw.Contains("h") || xRaw.Contains("x"))
{
x = BigInteger.Parse(xRaw.Substring(2), NumberStyles.AllowHexSpecifier);
y = BigInteger.Parse(yRaw.Substring(2), NumberStyles.AllowHexSpecifier);
}
else if (curveType.Type == CurveType.Nonsupersingular || curveType.Type == CurveType.Supersingular)
{
x = BitString.BinaryToBigInteger(xRaw);
y = BitString.BinaryToBigInteger(yRaw);
}
else
{
x = BigInteger.Parse(xRaw);
y = BigInteger.Parse(yRaw);
}
return(new BigIntegerPoint(x, y));
}
public static string[] Solve(string filename)
{
var solutions = new List <string>();
using (var file = new StreamReader(filename))
{
var curveType = new CurveType(file.ReadLine());
IEllepticCurve curve;
string a;
string b;
if (curveType.Type == CurveType.Nonsupersingular || curveType.Type == CurveType.Supersingular)
{
var polynome = file.ReadLine();
a = file.ReadLine();
b = file.ReadLine();
var c = file.ReadLine();
curve = curveType.Type == CurveType.Supersingular
? (IEllepticCurve) new SupersingularEllepticCurve(BitString.BinaryToBigInteger(polynome),
BitString.BinaryToBigInteger(a),
BitString.BinaryToBigInteger(b),
BitString.BinaryToBigInteger(c))
: (IEllepticCurve) new NonsupersingularEllepticCurve(BitString.BinaryToBigInteger(polynome),
BitString.BinaryToBigInteger(a),
BitString.BinaryToBigInteger(b),
BitString.BinaryToBigInteger(c));
}
else
{
var n = file.ReadLine();
a = file.ReadLine();
b = file.ReadLine();
curve = new PrimeEllepticCurve(BigInteger.Parse(n), BigInteger.Parse(a), BigInteger.Parse(b),
BigInteger.Parse(curveType.Type));
}
var operation = file.ReadLine();
while (!string.IsNullOrWhiteSpace(operation))
{
if (operation == "M")
{
var firstPoint = GetPoint(file, curveType);
var numberRaw = file.ReadLine();
var number = numberRaw.Contains("h") || numberRaw.Contains("x") ?
BigInteger.Parse(numberRaw.Substring(2), NumberStyles.AllowHexSpecifier) :
BigInteger.Parse(numberRaw);
var result = curve.MultiplyPointByNumber(firstPoint, number);
solutions.Add($"{firstPoint.ToString(curveType)} * {number} = {result.ToString(curveType)}");
}
if (operation == "A")
{
var firstPoint = GetPoint(file, curveType);
var secondPoint = GetPoint(file, curveType);
var result = curve.SummarizePoints(firstPoint, secondPoint);
solutions.Add($"{firstPoint.ToString(curveType)} + {secondPoint.ToString(curveType)} = {result.ToString(curveType)}");
}
operation = file.ReadLine();
}
}
return(solutions.ToArray());
}
