public void SEALContextParamsTest()
{
EncryptionParameters parms = new EncryptionParameters(SchemeType.BFV)
{
PolyModulusDegree = 128,
PlainModulus = new Modulus(1 << 6),
CoeffModulus = CoeffModulus.Create(128, new int[] { 30, 30, 30 })
};
SEALContext context = new SEALContext(parms, expandModChain: true, secLevel: SecLevelType.None);
SEALContext.ContextData data = context.KeyContextData;
Assert.IsNotNull(data);
EncryptionParameters parms2 = data.Parms;
Assert.AreEqual(parms.PolyModulusDegree, parms2.PolyModulusDegree);
EncryptionParameterQualifiers qualifiers = data.Qualifiers;
Assert.IsNotNull(qualifiers);
Assert.IsTrue(qualifiers.ParametersSet);
Assert.IsFalse(qualifiers.UsingBatching);
Assert.IsTrue(qualifiers.UsingFastPlainLift);
Assert.IsTrue(qualifiers.UsingFFT);
Assert.IsTrue(qualifiers.UsingNTT);
Assert.AreEqual(SecLevelType.None, qualifiers.SecLevel);
Assert.IsFalse(qualifiers.UsingDescendingModulusChain);
Assert.IsTrue(context.UsingKeyswitching);
ulong[] cdpm = data.CoeffDivPlainModulus;
Assert.AreEqual(3, cdpm.Length);
Assert.AreEqual(32ul, data.PlainUpperHalfThreshold);
Assert.AreEqual(3, data.PlainUpperHalfIncrement.Length);
Assert.IsNull(data.UpperHalfThreshold);
Assert.IsNotNull(data.UpperHalfIncrement);
Assert.AreEqual(3, data.UpperHalfIncrement.Length);
Assert.AreEqual(2ul, data.ChainIndex);
Assert.IsNull(data.PrevContextData);
SEALContext.ContextData data2 = data.NextContextData;
Assert.IsNotNull(data2);
Assert.AreEqual(1ul, data2.ChainIndex);
Assert.AreEqual(2ul, data2.PrevContextData.ChainIndex);
SEALContext.ContextData data3 = data2.NextContextData;
Assert.IsNotNull(data3);
Assert.AreEqual(0ul, data3.ChainIndex);
Assert.AreEqual(1ul, data3.PrevContextData.ChainIndex);
Assert.IsNull(data3.NextContextData);
parms = new EncryptionParameters(SchemeType.BFV)
{
PolyModulusDegree = 127,
PlainModulus = new Modulus(1 << 6),
CoeffModulus = CoeffModulus.Create(128, new int[] { 30, 30, 30 })
};
context = new SEALContext(parms, expandModChain: true, secLevel: SecLevelType.None);
Assert.AreEqual(context.ParameterErrorName(), "invalid_poly_modulus_degree_non_power_of_two");
Assert.AreEqual(context.ParameterErrorMessage(), "poly_modulus_degree is not a power of two");
}