public override SymmetricCipherResult ProcessPayload(IModeBlockCipherParameters param)
{
CheckPayloadRequirements(param.Payload);
if (param.Payload.BitLength / _engine.BlockSizeBits < PARTITIONS)
{
throw new ArgumentException($"CBCI mode needs at least {PARTITIONS} blocks of data");
}
var payloads = TdesPartitionHelpers.TriPartitionBitString(param.Payload);
var ivs = TdesPartitionHelpers.SetupIvs(param.Iv);
var key = param.Key.ToBytes();
var engineParam = new EngineInitParameters(param.Direction, key, param.UseInverseCipherMode);
_engine.Init(engineParam);
var outBuffer = GetOutputBuffer(param.Payload.BitLength);
if (param.Direction == BlockCipherDirections.Encrypt)
{
Encrypt(param, payloads, ivs, outBuffer);
}
else
{
Decrypt(param, payloads, ivs, outBuffer);
}
return(new SymmetricCipherResult(
new BitString(outBuffer).GetMostSignificantBits(param.Payload.BitLength)
));
}
private MCTResult <AlgoArrayResponse> Encrypt(IModeBlockCipherParameters param)
{
if (param.Payload.BitLength != 192)
{
throw new ArgumentException("Data must be 192 bits");
}
var ivs = TdesPartitionHelpers.SetupIvs(param.Iv);
var pts = TdesPartitionHelpers.TriPartitionBitString(param.Payload);
var responses = new List <AlgoArrayResponse> {
new AlgoArrayResponse {
IV = ivs[0],
Keys = param.Key,
PlainText = param.Payload
}
};
var lastCipherTexts = new List <BitString>();
var indexAtWhichToStartSaving = NUMBER_OF_ITERATIONS - NUMBER_OF_OUTPUTS_TO_SAVE;
for (var i = 0; i < NumberOfCases; i++)
{
for (var j = 0; j < NUMBER_OF_ITERATIONS; j++)
{
for (var k = 0; k < PARTITIONS; k++)
{
var result = _algo.ProcessPayload(new ModeBlockCipherParameters(
BlockCipherDirections.Encrypt,
responses[i].Keys,
ivs[k].XOR(pts[k])
)).Result;
pts[k] = ivs[k].GetDeepCopy();
ivs[k] = result.GetDeepCopy();
}
if (j >= indexAtWhichToStartSaving)
{
lastCipherTexts.Insert(0, ivs[NUMBER_OF_ITERATIONS - 1 - j].GetDeepCopy());
}
}
responses.Last().CipherText = ivs[0].ConcatenateBits(ivs[1]).ConcatenateBits(ivs[2]);
responses.Add(new AlgoArrayResponse
{
IV = ivs[0],
Keys = _keyMaker.MixKeys(new TDESKeys(responses[i].Keys.GetDeepCopy()), lastCipherTexts.ToList()).ToOddParityBitString(),
PlainText = pts[0].ConcatenateBits(pts[1].ConcatenateBits(pts[2]))
});
}
responses.RemoveAt(responses.Count() - 1);
return(new MCTResult <AlgoArrayResponse>(responses));
}
private MCTResult <AlgoArrayResponse> Encrypt(IModeBlockCipherParameters param)
{
var ivs = TdesPartitionHelpers.SetupIvs(param.Iv);
var responses = new List <AlgoArrayResponse> {
new AlgoArrayResponse {
IV = ivs[0],
Keys = param.Key.GetDeepCopy(),
PlainText = param.Payload.GetDeepCopy()
}
};
var lastCipherTexts = new List <BitString>();
var indexAtWhichToStartSaving = NUMBER_OF_ITERATIONS - NUMBER_OF_OUTPUTS_TO_SAVE;
for (var i = 0; i < NumberOfCases; i++)
{
var encryptionOutputs = new List <BitString>();
var cipherText = new BitString(0);
var encryptionInput = new BitString(0);
var key = responses.Last().Keys.GetDeepCopy();
for (var j = 0; j < NUMBER_OF_ITERATIONS; j++)
{
encryptionInput = j < PARTITIONS ? ivs[j] : encryptionOutputs[j - PARTITIONS];
var encryptionOutput = _algo.ProcessPayload(new ModeBlockCipherParameters(
BlockCipherDirections.Encrypt, key, encryptionInput
)).Result;
encryptionOutputs.Add(encryptionOutput.GetDeepCopy());
cipherText = param.Payload.XOR(encryptionOutput);
if (j >= indexAtWhichToStartSaving)
{
lastCipherTexts.Insert(0, cipherText.GetDeepCopy());
}
param.Payload = encryptionInput.GetDeepCopy();
}
responses.Last().CipherText = cipherText.GetDeepCopy();
ivs = TdesPartitionHelpers.SetupIvs(encryptionOutputs[9995].XOR(cipherText));
responses.Add(new AlgoArrayResponse
{
IV = ivs[0],
Keys = _keyMaker.MixKeys(new TDESKeys(responses[i].Keys.GetDeepCopy()), lastCipherTexts.ToList()).ToOddParityBitString(),
PlainText = responses.Last().PlainText.XOR(encryptionInput)
});
}
responses.RemoveAt(responses.Count() - 1);
return(new MCTResult <AlgoArrayResponse>(responses));
}
public MCTResult <AlgoArrayResponse> Encrypt(IModeBlockCipherParameters param)
{
var ivs = TdesPartitionHelpers.SetupIvs(param.Iv);
var responses = new List <AlgoArrayResponse> {
new AlgoArrayResponse {
IV = ivs[0],
Keys = param.Key,
PlainText = param.Payload
}
};
var numberOfOutputsToSave = 192 / Shift;
var indexAtWhichToStartSaving = NUMBER_OF_ITERATIONS - numberOfOutputsToSave;
for (var i = 0; i < NumberOfCases; i++)
{
ivs = TdesPartitionHelpers.SetupIvs(responses[i].IV.GetDeepCopy());
var tempText = responses[i].PlainText.GetDeepCopy();
BitString prevTempIv = null;
var tempIv = responses[i].IV.GetDeepCopy();
var keysForThisRound = responses[i].Keys;
BitString output = null;
var holdouts = new BitString[3];
var lastCipherTexts = new List <BitString>();
for (var j = 0; j < NUMBER_OF_ITERATIONS; j++)
{
switch (j)
{
case 0:
tempIv = ivs[0].GetDeepCopy();
break;
case 1:
tempIv = ivs[1].GetDeepCopy();
break;
case 2:
tempIv = ivs[2].GetDeepCopy();
break;
default:
tempIv = prevTempIv.MSBSubstring(Shift, 64 - Shift).ConcatenateBits(holdouts[2]);
break;
}
prevTempIv = tempIv.GetDeepCopy();
output = _algo.ProcessPayload(new ModeBlockCipherParameters(
BlockCipherDirections.Encrypt, tempIv, keysForThisRound, tempText)
).Result;
holdouts[2] = holdouts[1];
holdouts[1] = holdouts[0];
holdouts[0] = output;
tempText = prevTempIv.MSBSubstring(0, Shift);
if (j >= indexAtWhichToStartSaving)
{
lastCipherTexts.Insert(0, output.GetDeepCopy());
}
}
responses[i].CipherText = output;
var newIv = prevTempIv.MSBSubstring(Shift, 64 - Shift).ConcatenateBits(output);
var newIvs = TdesPartitionHelpers.SetupIvs(newIv);
responses.Add(new AlgoArrayResponse()
{
Keys = _keyMaker.MixKeys(new TDESKeys(responses[i].Keys.GetDeepCopy()), lastCipherTexts.ToList())
.ToOddParityBitString(),
PlainText = prevTempIv.GetDeepCopy().MSBSubstring(0, Shift),
IV = newIvs[0]
});
}
responses.RemoveAt(responses.Count - 1);
return(new MCTResult <AlgoArrayResponse>(responses));
}
