/// <summary>
/// Test the validity of the BigDecimalPolynomial implementation
/// </summary>
///
/// <returns>State</returns>
public string Test()
{
try
{
BigDecimalPolynomial a = CreateBigDecimalPolynomial(new int[] { 4, -1, 9, 2, 1, -5, 12, -7, 0, -9, 5 });
BigIntPolynomial b = new BigIntPolynomial(new IntegerPolynomial(new int[] { -6, 0, 0, 13, 3, -2, -4, 10, 11, 2, -1 }));
BigDecimalPolynomial c = a.Multiply(b);
if(!Compare.AreEqual(c.Coeffs, CreateBigDecimalPolynomial(new int[] { 2, -189, 77, 124, -29, 0, -75, 124, -49, 267, 34 }).Coeffs))
throw new Exception("The BigDecimalPolynomial test failed!");
// multiply a polynomial by its inverse modulo 2048 and check that the result is 1
IntegerPolynomial d, dInv;
CSPRng rng = new CSPRng();
do
{
d = DenseTernaryPolynomial.GenerateRandom(1001, 333, 334, rng);
dInv = d.InvertFq(2048);
} while (dInv == null);
d.Mod(2048);
BigDecimalPolynomial e = CreateBigDecimalPolynomial(d.Coeffs);
BigIntPolynomial f = new BigIntPolynomial(dInv);
IntegerPolynomial g = new IntegerPolynomial(e.Multiply(f).Round());
g.ModPositive(2048);
if (!g.EqualsOne())
throw new Exception("The BigDecimalPolynomial test failed!");
OnProgress(new TestEventArgs("Passed BigDecimalPolynomial tests"));
return SUCCESS;
}
catch (Exception Ex)
{
string message = Ex.Message == null ? "" : Ex.Message;
throw new Exception(FAILURE + message);
}
}
/// <summary>
/// Computes the inverse mod 3.
/// <para>Returns <c>null</c> if the polynomial is not invertible.
/// The algorithm is described in <a href="http://www.securityinnovation.com/uploads/Crypto/NTRUTech014.pdf">
/// Almost Inverses and Fast NTRU Key Generation</a>.</para>
/// </summary>
///
/// <returns>A new polynomial, or <c>null</c> if no inverse exists</returns>
public IntegerPolynomial InvertF3()
{
int N = Coeffs.Length;
int k = 0;
IntegerPolynomial b = new IntegerPolynomial(N + 1);
b.Coeffs[0] = 1;
IntegerPolynomial c = new IntegerPolynomial(N + 1);
IntegerPolynomial f = new IntegerPolynomial(N + 1);
f.Coeffs = Coeffs.CopyOf(N + 1);
f.ModPositive(3);
// set g(x) = x^N − 1
IntegerPolynomial g = new IntegerPolynomial(N + 1);
g.Coeffs[0] = -1;
g.Coeffs[N] = 1;
while (true)
{
while (f.Coeffs[0] == 0)
{
for (int i = 1; i <= N; i++)
{
f.Coeffs[i - 1] = f.Coeffs[i]; // f(x) = f(x) / x
c.Coeffs[N + 1 - i] = c.Coeffs[N - i]; // c(x) = c(x) * x
}
f.Coeffs[N] = 0;
c.Coeffs[0] = 0;
k++;
if (f.EqualsZero())
return null; // not invertible
}
if (f.EqualsAbsOne())
break;
if (f.Degree() < g.Degree())
{
// exchange f and g
IntegerPolynomial temp = f;
f = g;
g = temp;
// exchange b and c
temp = b;
b = c;
c = temp;
}
if (f.Coeffs[0] == g.Coeffs[0])
{
f.Subtract(g, 3);
b.Subtract(c, 3);
}
else
{
f.Add(g, 3);
b.Add(c, 3);
}
}
if (b.Coeffs[N] != 0)
return null;
// Fp(x) = [+-] x^(N-k) * b(x)
IntegerPolynomial Fp = new IntegerPolynomial(N);
int j = 0;
k %= N;
for (int i = N - 1; i >= 0; i--)
{
j = i - k;
if (j < 0)
j += N;
Fp.Coeffs[j] = f.Coeffs[0] * b.Coeffs[i];
}
Fp.EnsurePositive(3);
return Fp;
}
private void SubAndTest()
{
IntegerPolynomial i1 = new IntegerPolynomial(new int[] { 1368, 2047, 672, 871, 1662, 1352, 1099, 1608 });
IntegerPolynomial i2 = new IntegerPolynomial(new int[] { 1729, 1924, 806, 179, 1530, 1381, 1695, 60 });
LongPolynomial2 a = new LongPolynomial2(i1);
LongPolynomial2 b = new LongPolynomial2(i2);
a.SubAnd(b, 2047);
i1.Subtract(i2);
i1.ModPositive(2048);
if (!Compare.AreEqual(a.ToIntegerPolynomial().Coeffs, i1.Coeffs))
throw new Exception("LongPolynomial2 SubAnd test failed!");
}
private void Mult2AndTest()
{
IntegerPolynomial i1 = new IntegerPolynomial(new int[] { 1368, 2047, 672, 871, 1662, 1352, 1099, 1608 });
LongPolynomial2 i2 = new LongPolynomial2(i1);
i2.Mult2And(2047);
i1.Multiply(2);
i1.ModPositive(2048);
if (!Compare.AreEqual(i1.Coeffs, i2.ToIntegerPolynomial().Coeffs))
throw new Exception("LongPolynomial2 Mult2And test failed!");
}
