public static uint[] FromBigInteger(BigInteger x) { if (x.SignValue < 0 || x.BitLength > 224) { throw new ArgumentException(); } uint[] array = Nat224.Create(); int num = 0; while (x.SignValue != 0) { array[num++] = (uint)x.IntValue; x = x.ShiftRight(32); } return(array); }
public static void Mul(uint[] x, uint[] y, uint[] zz) { Nat224.Mul(x, y, zz); Nat224.Mul(x, 7, y, 7, zz, 14); uint c21 = Nat224.AddToEachOther(zz, 7, zz, 14); uint c14 = c21 + Nat224.AddTo(zz, 0, zz, 7, 0); c21 += Nat224.AddTo(zz, 21, zz, 14, c14); uint[] dx = Nat224.Create(), dy = Nat224.Create(); bool neg = Nat224.Diff(x, 7, x, 0, dx, 0) != Nat224.Diff(y, 7, y, 0, dy, 0); uint[] tt = Nat224.CreateExt(); Nat224.Mul(dx, dy, tt); c21 += neg ? Nat.AddTo(14, tt, 0, zz, 7) : (uint)Nat.SubFrom(14, tt, 0, zz, 7); Nat.AddWordAt(28, c21, zz, 21); }
public static void Square(uint[] x, uint[] zz) { Nat224.Square(x, zz); Nat224.Square(x, 7, zz, 14); uint c21 = Nat224.AddToEachOther(zz, 7, zz, 14); uint c14 = c21 + Nat224.AddTo(zz, 0, zz, 7, 0); c21 += Nat224.AddTo(zz, 21, zz, 14, c14); uint[] dx = Nat224.Create(); Nat224.Diff(x, 7, x, 0, dx, 0); uint[] tt = Nat224.CreateExt(); Nat224.Square(dx, tt); c21 += (uint)Nat.SubFrom(14, tt, 0, zz, 7); Nat.AddWordAt(28, c21, zz, 21); }