public OtherInfo(
IEntropyProvider entropyProvider,
string otherInfoPattern,
int otherInfoLength,
KeyAgreementRole thisPartyKeyAgreementRole,
PartyOtherInfo thisPartyOtherInfo,
PartyOtherInfo otherPartyOtherInfo
)
{
_thisPartyKeyAgreementRole = thisPartyKeyAgreementRole;
_thisPartyOtherInfo = thisPartyOtherInfo;
_otherPartyOtherInfo = otherPartyOtherInfo;
// split the pattern into pieces
var pieces = otherInfoPattern.Split("||".ToCharArray(), StringSplitOptions.RemoveEmptyEntries);
foreach (var piece in pieces)
{
var workingPiece = piece.Replace("||", "");
_otherInfo = _otherInfo.ConcatenateBits(ConcatenatePieceOntoOtherInfo(workingPiece));
}
// Add entropy to hit otherInfoLength
_otherInfo = _otherInfo.ConcatenateBits(entropyProvider.GetEntropy(otherInfoLength - _otherInfo.BitLength));
_otherInfo = _otherInfo.GetMostSignificantBits(otherInfoLength);
}
public void OtherInfoProofOfConceptTests(OtherPartySharedInformation <FfcDomainParameters, FfcKeyPair> uPartySharedInformation, int otherInfoLength, string otherInfoPattern, BitString expectedBitString)
{
var vPartySharedInformation = new OtherPartySharedInformation <FfcDomainParameters, FfcKeyPair>(
null,
new BitString(0),
new FfcKeyPair(0),
new FfcKeyPair(0),
new BitString(0),
new BitString(0),
new BitString(0)
);
var uPartyOtherInfo = new PartyOtherInfo(uPartySharedInformation.PartyId, uPartySharedInformation.DkmNonce);
var vPartyotherInfo = new PartyOtherInfo(vPartySharedInformation.PartyId, vPartySharedInformation.DkmNonce);
_subject = new OtherInfo(
new EntropyProvider(new Random800_90()),
otherInfoPattern,
otherInfoLength,
KeyAgreementRole.InitiatorPartyU,
uPartyOtherInfo,
vPartyotherInfo
);
var result = _subject.GetOtherInfo();
Assert.AreEqual(expectedBitString.ToHex(), result.ToHex());
}
public IOtherInfo GetInstance(
string otherInfoPattern,
int otherInfoLength,
KeyAgreementRole thisPartyKeyAgreementRole,
PartyOtherInfo thisPartySharedInformation,
PartyOtherInfo otherPartySharedInformation)
{
return(new FakeOtherInfo(_otherInfo));
}
/// <summary>
/// Generate the OtherInformation that is to be plugged into a KDF function.
/// </summary>
/// <param name="otherPartyInformation">The other party's public information</param>
/// <returns></returns>
protected IOtherInfo GenerateOtherInformation(TOtherPartySharedInfo otherPartyInformation)
{
var thisPartyPublicInfo = ReturnPublicInfoThisParty();
var thisPartyOtherInfo = new PartyOtherInfo(thisPartyPublicInfo.PartyId, thisPartyPublicInfo.DkmNonce);
var otherPartyOtherInfo = new PartyOtherInfo(otherPartyInformation.PartyId, otherPartyInformation.DkmNonce);
return(OtherInfoFactory.GetInstance(
KdfParameters.OtherInfoPattern,
OtherInputLength,
SchemeParameters.KeyAgreementRole,
thisPartyOtherInfo,
otherPartyOtherInfo
));
}
public IOtherInfo GetInstance(
string otherInfoPattern,
int otherInfoLength,
KeyAgreementRole thisPartyKeyAgreementRole,
PartyOtherInfo thisPartyOtherInfo,
PartyOtherInfo otherPartyOtherInfo
)
{
return(new OtherInfo(
_entropyProvider,
otherInfoPattern,
otherInfoLength,
thisPartyKeyAgreementRole,
thisPartyOtherInfo,
otherPartyOtherInfo
));
}
public void ShouldReturnCorrectOtherInfoCavsTests(
KeyAgreementRole iutRole,
OtherPartySharedInformation <FfcDomainParameters, FfcKeyPair> uPartySharedInformation,
OtherPartySharedInformation <FfcDomainParameters, FfcKeyPair> vPartySharedInformation,
int otherInfoLength,
BitString expectedOtherInfo
)
{
string otherInfoPattern = "uPartyInfo||vPartyInfo";
TestableEntropyProvider entropyProvider = new TestableEntropyProvider();
// u/v party info comprised of ID, and dkmNonce, find the bitlength of both parties contributed information
// to determine which bits are the "random" bits to inject into the TestableEntropyProvider.
var composedBitLength = uPartySharedInformation.PartyId.BitLength +
uPartySharedInformation.DkmNonce.BitLength +
vPartySharedInformation.PartyId.BitLength;
var entropyBits = expectedOtherInfo.GetLeastSignificantBits(expectedOtherInfo.BitLength - composedBitLength);
entropyProvider.AddEntropy(entropyBits);
var uPartyOtherInfo = new PartyOtherInfo(uPartySharedInformation.PartyId, uPartySharedInformation.DkmNonce);
var vPartyOtherInfo = new PartyOtherInfo(vPartySharedInformation.PartyId, vPartySharedInformation.DkmNonce);
_subject = new OtherInfo(
entropyProvider,
otherInfoPattern,
otherInfoLength,
KeyAgreementRole.InitiatorPartyU,
uPartyOtherInfo,
vPartyOtherInfo
);
var result = _subject.GetOtherInfo();
Assert.AreEqual(expectedOtherInfo.ToHex(), result.ToHex());
}
