public override SymmetricCipherResult ProcessPayload(IModeBlockCipherParameters param)
{
CheckPayloadRequirements(param.Payload);
var key = param.Key.ToBytes();
var engineParam = new EngineInitParameters(param.Direction, key, param.UseInverseCipherMode);
_engine.Init(engineParam);
var numberOfBlocks = GetNumberOfBlocks(param.Payload.BitLength);
var outBuffer = GetOutputBuffer(param.Payload.BitLength);
if (param.Direction == BlockCipherDirections.Encrypt)
{
Encrypt(param, numberOfBlocks, outBuffer);
}
else
{
Decrypt(param, numberOfBlocks, outBuffer);
}
var output = new BitString(outBuffer);
return(new SymmetricCipherResult(output.GetMostSignificantBits(param.Payload.BitLength)));
}
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)
));
}
public override SymmetricCipherResult ProcessPayload(IModeBlockCipherParameters param)
{
CheckPayloadRequirements(param.Payload);
var key = param.Key.ToBytes();
var actualBitsToProcess = param.Payload.BitLength;
param.Payload = BitString.PadToNextByteBoundry(param.Payload);
// CFB always utilizes engine in encrypt mode
var engineParam = new EngineInitParameters(BlockCipherDirections.Encrypt, key, param.UseInverseCipherMode);
_engine.Init(engineParam);
var numberOfSegments = actualBitsToProcess / _shiftRegisterStrategy.ShiftSize;
var outBuffer = GetOutputBuffer(param.Payload.BitLength);
if (param.Direction == BlockCipherDirections.Encrypt)
{
Encrypt(param, numberOfSegments, outBuffer);
}
else
{
Decrypt(param, numberOfSegments, outBuffer);
}
return(new SymmetricCipherResult(
new BitString(outBuffer).GetMostSignificantBits(actualBitsToProcess)
));
}
public SymmetricCipherResult ProcessPayload(IFfxModeBlockCipherParameters param)
{
var key = param.Key.ToBytes();
var engineParam = new EngineInitParameters(param.Direction, key, param.UseInverseCipherMode);
_engine.Init(engineParam);
CheckPayloadRequirements(param.Payload);
if (param.Direction == BlockCipherDirections.Encrypt)
{
return(new SymmetricCipherResult(Encrypt(param)));
}
return(new SymmetricCipherResult(Decrypt(param)));
}
public override SymmetricCipherResult ProcessPayload(IModeBlockCipherParameters param)
{
CheckPayloadRequirements(param.Payload);
var key = param.Key.ToBytes();
var engineParam = new EngineInitParameters(param.Direction, key, param.UseInverseCipherMode);
_engine.Init(engineParam);
var numberOfBlocks = GetNumberOfBlocks(param.Payload.BitLength);
var outBuffer = GetOutputBuffer(_engine.BlockSizeBits);
// Same logic regardless of encrypt/decrypt
ProcessPayload(param, numberOfBlocks, outBuffer);
return(new SymmetricCipherResult(
new BitString(outBuffer)
));
}
public override SymmetricCipherResult ProcessPayload(IModeBlockCipherParameters param)
{
CheckPayloadRequirements(param.Payload);
var key = param.Key.ToBytes();
// OFB always utilizes engine in encrypt mode
var engineParam = new EngineInitParameters(BlockCipherDirections.Encrypt, key, param.UseInverseCipherMode);
_engine.Init(engineParam);
var numberOfBlocks = GetNumberOfBlocks(param.Payload.BitLength);
var outBuffer = GetOutputBuffer(param.Payload.BitLength);
ProcessPayload(param, numberOfBlocks, outBuffer);
return(new SymmetricCipherResult(
new BitString(outBuffer).GetMostSignificantBits(param.Payload.BitLength)
));
}
public SymmetricCounterResult ExtractIvs(ICounterModeBlockCipherParameters parameters)
{
BitString plainText, cipherText;
if (parameters.Direction == BlockCipherDirections.Encrypt)
{
plainText = parameters.Payload;
cipherText = parameters.Result;
}
else
{
plainText = parameters.Result;
cipherText = parameters.Payload;
}
plainText = BitString.PadToModulus(plainText, _engine.BlockSizeBits);
cipherText = BitString.PadToModulus(cipherText, _engine.BlockSizeBits);
var numberOfBlocks = GetNumberOfBlocks(plainText.BitLength);
var ivs = new List <BitString>();
var engineParam = new EngineInitParameters(BlockCipherDirections.Decrypt, parameters.Key.ToBytes(), parameters.UseInverseCipherMode);
_engine.Init(engineParam);
for (var i = 0; i < numberOfBlocks; i++)
{
var blockPt = plainText.MSBSubstring(i * _engine.BlockSizeBits, _engine.BlockSizeBits);
var blockCt = cipherText.MSBSubstring(i * _engine.BlockSizeBits, _engine.BlockSizeBits);
var xor = BitString.XOR(blockPt, blockCt).ToBytes();
var outBuffer = GetOutputBuffer(blockPt.BitLength);
_engine.ProcessSingleBlock(xor, outBuffer, 0);
ivs.Add(new BitString(outBuffer));
}
return(new SymmetricCounterResult(parameters.Result, ivs));
}
