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 KdfMultiExpansionResult Kdf(KdfMultiExpansionParameterHkdf param)
{
var kdf = _hkdfFactory.GetKdf(ShaAttributes.GetHashFunctionFromEnum(param.HmacAlg));
List <KdfResult> result = new List <KdfResult>();
foreach (var iterationParameter in param.IterationParameters)
{
result.Add(kdf.DeriveKey(param.Salt, param.Z, iterationParameter.FixedInfo, iterationParameter.L / BitString.BITSINBYTE));
}
return(new KdfMultiExpansionResult(result));
}