public override string ProcessMessage()
{
LMKPairs.LMKPair LMKKeyPair = LMKPairs.LMKPair.Null;
string var = "";
KeySchemeTable.KeyScheme ks = KeySchemeTable.KeyScheme.Unspecified;
HexKey.KeyLength kl = HexKey.KeyLength.SingleLength;
KeySchemeTable.KeyScheme zmkKS = KeySchemeTable.KeyScheme.Unspecified;
HexKey.KeyLength zmkKL;
string cryptKey = m_inStack.PopFromStack().ConsoleMessageProperty;
string cryptZMK = m_inStack.PopFromStack().ConsoleMessageProperty;
string keyScheme = m_inStack.PopFromStack().ConsoleMessageProperty;
string keyType = m_inStack.PopFromStack().ConsoleMessageProperty;
ExtractKeySchemeAndLength(cryptZMK, out zmkKL, out zmkKS);
ExtractKeySchemeAndLength(cryptKey, out kl, out ks);
ValidateKeyTypeCode(keyType, out LMKKeyPair, out var);
string clearZMK = Utility.DecryptZMKEncryptedUnderLMK(new HexKey(cryptZMK).ToString(), zmkKS, 0);
string clearKey = Utility.DecryptUnderLMK(new HexKey(cryptKey).ToString(), ks, LMKKeyPair, var);
string cryptUnderZMK = Utility.EncryptUnderZMK(clearZMK, new HexKey(clearKey).ToString(), KeySchemeTable.GetKeySchemeFromValue(keyScheme));
string chkVal = TripleDES.TripleDESEncrypt(new HexKey(clearKey), ZEROES);
return("Key encrypted under ZMK: " + MakeKeyPresentable(cryptUnderZMK) + System.Environment.NewLine +
"Key Check Value: " + MakeCheckValuePresentable(chkVal));
}
private HexKey GetRandomKey(HexKey.KeyLength l)
{
switch (l)
{
case HexKey.KeyLength.SingleLength:
return(new HexKey(Utility.RandomKey(true, Utility.ParityCheck.OddParity)));
case HexKey.KeyLength.DoubleLength:
return(new HexKey(Utility.MakeParity(Utility.RandomKey(true, Utility.ParityCheck.OddParity) + Utility.RandomKey(true, Utility.ParityCheck.OddParity), Utility.ParityCheck.OddParity)));
default:
return(new HexKey(Utility.MakeParity(Utility.RandomKey(true, Utility.ParityCheck.OddParity) + Utility.RandomKey(true, Utility.ParityCheck.OddParity) + Utility.RandomKey(true, Utility.ParityCheck.OddParity), Utility.ParityCheck.OddParity)));
}
}
protected void ValidateKeySchemeAndLength(HexKey.KeyLength keyLen, string keyScheme, KeySchemeTable.KeyScheme ks)
{
switch (keyLen)
{
case HexKey.KeyLength.SingleLength:
ValidateKeySchemeAndLength("1", keyScheme, out ks);
break;
case HexKey.KeyLength.DoubleLength:
ValidateKeySchemeAndLength("2", keyScheme, out ks);
break;
case HexKey.KeyLength.TripleLength:
ValidateKeySchemeAndLength("3", keyScheme, out ks);
break;
default:
throw new Exceptions.XInvalidKeyScheme("INVALID KEY SCHEME FOR KEY LENGTH");
}
}
