private final FiniteFieldNumber finiteFieldProduct(
FiniteFieldNumber input1, FiniteFieldNumber input2) {
int x = input1.intValue();
int y = input2.intValue();
int n = input1.getN();
int prim_poly = input1.getPrimativePolynomial();
int z = 0;
/* Convolve x and y as bit strings mod 2 */
for (int i = 0; i < n; i++) if ((1 & (x >> i)) == 1) z ^= (y << i);
/* Take any "extra" bits located at bit n or higher and fold it back down */
for (int i = 2 * n; i >= n; i--) if ((1 & (z >> i)) == 1) z ^= (prim_poly << (i - n));
return input1.cloneWithNewValue(z);
}
@Override
public final void evalDeterministic(Object[] arguments) {
// Allow one constant input
Object arg1 = arguments[1];
Object arg2 = arguments[2];
FiniteFieldNumber input1 =
(arg1 instanceof FiniteFieldNumber)
? (FiniteFieldNumber) arg1
: ((FiniteFieldNumber) arg2).cloneWithNewValue(FactorFunctionUtilities.toInteger(arg1));
FiniteFieldNumber input2 =
(arg2 instanceof FiniteFieldNumber)
? (FiniteFieldNumber) arg2
: ((FiniteFieldNumber) arg1).cloneWithNewValue(FactorFunctionUtilities.toInteger(arg2));
if (!input1.isCompatible(input2))
throw new DimpleException("Primitive polynomials must match.");
arguments[0] = finiteFieldProduct(input1, input2); // Replace the output value
}
@Override
public final void evalDeterministic(Value[] arguments) {
// Allow one constant input
final Value arg1Value = arguments[1];
final Value arg2Value = arguments[2];
final Object arg1 = requireNonNull(arg1Value.getObject());
final Object arg2 = requireNonNull(arg2Value.getObject());
final FiniteFieldNumber input1 =
(arg1 instanceof FiniteFieldNumber)
? (FiniteFieldNumber) arg1
: ((FiniteFieldNumber) arg2).cloneWithNewValue(arg1Value.getInt());
final FiniteFieldNumber input2 =
(arg2 instanceof FiniteFieldNumber)
? (FiniteFieldNumber) arg2
: ((FiniteFieldNumber) arg1).cloneWithNewValue(arg2Value.getInt());
if (!input1.isCompatible(input2))
throw new DimpleException("Primitive polynomials must match.");
arguments[0].setFiniteField(finiteFieldProduct(input1, input2)); // Replace the output value
}
@Override
public double evalEnergy(Value[] values) {
// Allow one constant input
FiniteFieldNumber result = (FiniteFieldNumber) values[0].getObject();
Object arg1 = values[1].getObject();
FiniteFieldNumber input1 =
(arg1 instanceof FiniteFieldNumber)
? (FiniteFieldNumber) arg1
: result.cloneWithNewValue(FactorFunctionUtilities.toInteger(arg1));
Object arg2 = values[2].getObject();
FiniteFieldNumber input2 =
(arg2 instanceof FiniteFieldNumber)
? (FiniteFieldNumber) arg2
: result.cloneWithNewValue(FactorFunctionUtilities.toInteger(arg2));
if (!result.isCompatible(input1) || !result.isCompatible(input2))
throw new DimpleException("Primitive polynomials must match.");
FiniteFieldNumber computedResult = finiteFieldProduct(input1, input2);
return (computedResult.isEqual(result)) ? 0 : Double.POSITIVE_INFINITY;
}
@Override
public final double evalEnergy(Value[] arguments) {
// Allow one constant input
final FiniteFieldNumber result = requireNonNull((FiniteFieldNumber) arguments[0].getObject());
final Value arg1 = arguments[1];
final FiniteFieldNumber input1 =
(arg1 instanceof FiniteFieldValue)
? arg1.getFiniteField()
: result.cloneWithNewValue(arg1.getInt());
final Value arg2 = arguments[2];
final FiniteFieldNumber input2 =
(arg2 instanceof FiniteFieldValue)
? arg2.getFiniteField()
: result.cloneWithNewValue(arg2.getInt());
if (!result.isCompatible(input1) || !result.isCompatible(input2))
throw new DimpleException("Primitive polynomials must match.");
final FiniteFieldNumber computedResult = finiteFieldProduct(input1, input2);
return (computedResult.isEqual(result)) ? 0 : Double.POSITIVE_INFINITY;
}
