public static Shifr[] InShifr(string _str, EllipticCurvePoint g)
{
StringBuilder str = new StringBuilder(_str);
int _countSh = Convert.ToInt32(str.ToString(0, 24), 2);
Shifr[] sh = new Shifr[_countSh];
int count = Convert.ToInt32(str.ToString(24, 8), 2);
List <byte> pkP = new List <byte>();
for (int i = 0; i < count; i++)
{
byte temp = Convert.ToByte(str.ToString(32 + i * 8, 8), 2);
pkP.Add(temp);
}
str = str.Remove(0, count * 8 + 32);
byte[] pointkP = pkP.ToArray();
string point1 = BitConverter.ToString(pointkP, 0).Replace("-", ""); // сжатая точка kP
EllipticCurvePoint kP = EllipticCurvePoint.UnCompressPoint(point1, g);
string[] strshifr = new string[_countSh];
var tasks = new List <Task>();
int currentchar = 0;
for (int i = 0; i < _countSh; i++)
{
int lenstrcadr = Convert.ToInt32(str.ToString(currentchar, 16), 2);
strshifr[i] = str.ToString(currentchar + 16, lenstrcadr);
currentchar += lenstrcadr + 16;
var i1 = i;
tasks.Add(Task.Factory.StartNew(delegate()
{
int correct = 0; // корректировка
correct = Convert.ToInt32(strshifr[i1].Substring(0, 5), 2);
int countSecondPoint = Convert.ToInt32(strshifr[i1].Substring(5, 8), 2);
var secondPoint = new List <byte>();
for (int j = 0; j < countSecondPoint; j++)
{
byte temp = Convert.ToByte(strshifr[i1].Substring(13 + 8 * j, 8), 2);
secondPoint.Add(temp);
}
string _second = BitConverter.ToString(secondPoint.ToArray(), 0).Replace("-", ""); // сжатая точка
var second = EllipticCurvePoint.UnCompressPoint(_second, g);
sh[i1] = new Shifr(kP, second, correct);
}));
}
Task.WaitAll(tasks.ToArray());
return(sh.ToArray());
}
public Encryption(string pathPublicKey)
{
#region открытие ключа
StringBuilder sb = new StringBuilder();
byte[] inputfile = File.ReadAllBytes(pathPublicKey);
byte rem = inputfile[0];
for (int i = 1; i < inputfile.Count() - 1; i++)
{
sb.Append(Convert.ToString(Convert.ToByte(inputfile[i]), 2).FillWithZero(8));
}
sb.Append(Convert.ToString(Convert.ToByte(inputfile[inputfile.Count() - 1]), 2).FillWithZero(rem));
#endregion
if (sb.ToString(0, 1).Equals("1")) // если кривая заданна в программе
{
EllipticCurvePoint g = new EllipticCurvePoint(192);
if (sb.ToString(1, 2).Equals("00"))
{
// g = new EllipticCurvePoint(192);
}
else if (sb.ToString(1, 2).Equals("01"))
{
g = new EllipticCurvePoint(256);
}
else if (sb.ToString(1, 2).Equals("10"))
{
g = new EllipticCurvePoint(384);
}
else if (sb.ToString(1, 2).Equals("11"))
{
g = new EllipticCurvePoint(521);
}
else
{
throw new Exception("Файл поврежден. Невозможно определить тип кривой.");
}
int count = Convert.ToInt32(sb.ToString(3, 8), 2);
List <byte> point = new List <byte>();
for (int j = 0; j < count; j++)
{
byte temp = Convert.ToByte(sb.ToString(11 + 8 * j, 8), 2);
point.Add(temp);
}
sb = sb.Remove(0, 8 * count + 11);
string _second = BitConverter.ToString(point.ToArray(), 0).Replace("-", ""); // сжатая точка
openKey = EllipticCurvePoint.UnCompressPoint(_second, g);
count = Convert.ToInt32(sb.ToString(0, 8), 2);
point = new List <byte>();
for (int j = 0; j < count; j++)
{
byte temp = Convert.ToByte(sb.ToString(8 + 8 * j, 8), 2);
point.Add(temp);
}
_second = BitConverter.ToString(point.ToArray(), 0).Replace("-", ""); // сжатая точка
Point = EllipticCurvePoint.UnCompressPoint(_second, g);
}
else
{
throw new Exception("Файл поврежден");
}
}