public void ShouldMultiExpandSameResult()
{
var fixedInfo = new BitString(128);
var salt = new BitString(128);
var z = new BitString(128);
var hmacAlg = HashFunctions.Sha2_d256;
var l = 256;
var hkdfParam = new KdfParameterHkdf()
{
L = l,
Salt = salt,
Z = z,
HmacAlg = hmacAlg
};
var multiExpandHkdfParam = new KdfMultiExpansionParameterHkdf()
{
Salt = salt,
Z = z,
HmacAlg = hmacAlg,
IterationParameters = new List <KdfMultiExpansionIterationParameter>()
{
new KdfMultiExpansionIterationParameter(l, fixedInfo),
new KdfMultiExpansionIterationParameter(l, fixedInfo),
}
};
var hkdfResult = _kdfVisitor.Kdf(hkdfParam, fixedInfo);
var multiExpandHkdfResult = _kdfMultiExpansionVisitor.Kdf(multiExpandHkdfParam);
Assert.True(multiExpandHkdfResult.Results.Count == 2);
Assert.AreEqual(hkdfResult.DerivedKey, multiExpandHkdfResult.Results[0].DerivedKey);
Assert.AreEqual(hkdfResult.DerivedKey, multiExpandHkdfResult.Results[1].DerivedKey);
}
public KdfResult Kdf(KdfParameterOneStep param, BitString fixedInfo)
{
var result = _kdfVisitor.Kdf(param, fixedInfo);
var dkmBytesLen = result.DerivedKey.BitLength.CeilingDivide(BitString.BITSINBYTE);
// Modify a random byte within DKM
result.DerivedKey[_random.GetRandomInt(0, dkmBytesLen)] += 2;
return(result);
}
public void ShouldKdf()
{
var twoStepParam = new KdfParameterTwoStep()
{
L = 256,
Salt = new BitString(128),
Z = new BitString(128),
CounterLen = 8,
CounterLocation = CounterLocations.AfterFixedData,
KdfMode = KdfModes.Counter,
MacMode = MacModes.HMAC_SHA224,
};
var dkm = _kdfVisitor.Kdf(twoStepParam, new BitString(128));
Assert.AreEqual("EB9436CDC0C6FBC168A3BDE32929C104C2E4F4C1DEA2CA3485A7799E49870E0C", dkm.DerivedKey.ToHex());
}
public KdfResult Kdf(KdfParameterOneStep param, BitString fixedInfo)
{
var zBytesLen = param.Z.BitLength.CeilingDivide(BitString.BITSINBYTE);
var modifiedParam = new KdfParameterOneStep()
{
L = param.L,
Salt = param.Salt,
Z = param.Z.GetDeepCopy(),
AuxFunction = param.AuxFunction,
FixedInfoPattern = param.FixedInfoPattern,
FixedInputEncoding = param.FixedInputEncoding
};
// Modify a random byte within Z
modifiedParam.Z[_random.GetRandomInt(0, zBytesLen)] += 2;
return(_kdfVisitor.Kdf(modifiedParam, fixedInfo));
}
public void ShouldKdfWithEntropyBits()
{
var fixedInfo = new FixedInfoFactory(new FixedInfoStrategyFactory()).Get()
.Get(new FixedInfoParameter()
{
FixedInfoPattern = "entropyBits[96]",
EntropyBits = new BitString("1EE48EE4593B28D592D6ABFD"),
L = 256,
Encoding = FixedInfoEncoding.Concatenation,
});
var result = _kdfVisitor.Kdf(new KdfParameterOneStep()
{
L = 256,
Z = new BitString("A641EE6887A5C679A6398B398DC14394B8BE1750A38616A80A5C3D3A59DDB302"),
AuxFunction = KdaOneStepAuxFunction.SHA2_D256
}, fixedInfo);
var expectedDkm = new BitString("C56E3F1ADA02DB5511C7941839A68A4CAFD7B3F3BBFDBAAD430F49619FFEDF28");
Assert.AreEqual(expectedDkm.ToHex(), result.DerivedKey.ToHex());
}
public KdfResult AcceptKdf(IKdfVisitor visitor, BitString fixedInfo)
{
return(visitor.Kdf(this, fixedInfo));
}