private void Encrypt(IModeBlockCipherParameters param, int numberOfSegments, byte[] outBuffer)
{
var payLoad = param.Payload.GetDeepCopy().ToBytes();
var iv = param.Iv.GetDeepCopy().ToBytes();
var ivOutBuffer = new byte[iv.Length];
// For each segment
for (int i = 0; i < numberOfSegments; i++)
{
_engine.ProcessSingleBlock(iv, ivOutBuffer, 0);
// XORs the current segment of payload onto the first segment of the ivOutBuffer
_shiftRegisterStrategy.SetSegmentInProcessedBlock(payLoad, i, ivOutBuffer);
// Sets the outbuffer segment equal to the first segment of the ivOutBuffer
_shiftRegisterStrategy.SetOutBufferSegmentFromIvXorPayload(ivOutBuffer, i, outBuffer);
// Sets up the iv for the next segment
_shiftRegisterStrategy.SetNextRoundIv(ivOutBuffer, 0, iv);
}
// Update the Param.Iv for the next call
for (int i = 0; i < _engine.BlockSizeBytes; i++)
{
param.Iv[i] = iv[i];
}
}
private void Encrypt(IModeBlockCipherParameters param, int numberOfSegments, BitString[] ivs, byte[] outBuffer)
{
var payLoad = param.Payload.ToBytes();
var ivOutBuffer = new byte[_engine.BlockSizeBytes];
var iv = ivs[0].ToBytes();
// For each segment
for (int i = 0; i < numberOfSegments; i++)
{
_engine.ProcessSingleBlock(iv, ivOutBuffer, 0);
// XORs the current segment of payload onto the first segment of the ivOutBuffer
_shiftRegisterStrategy.SetSegmentInProcessedBlock(payLoad, i, ivOutBuffer);
// Sets the outbuffer segment equal to the first segment of the ivOutBuffer
_shiftRegisterStrategy.SetOutBufferSegmentFromIvXorPayload(ivOutBuffer, i, outBuffer);
if (i + 1 < PARTITIONS)
{
iv = ivs[(i + 1) % PARTITIONS].ToBytes();
}
else
{
iv = new BitString(iv)
.MSBSubstring(_shiftRegisterStrategy.ShiftSize, 64 - _shiftRegisterStrategy.ShiftSize)
.ConcatenateBits(
new BitString(outBuffer)
.MSBSubstring((i + 1 - PARTITIONS) * _shiftRegisterStrategy.ShiftSize,
_shiftRegisterStrategy.ShiftSize)
).ToBytes();
}
}
// Update the Param.Iv for the next call
for (int i = 0; i < _engine.BlockSizeBytes; i++)
{
param.Iv[i] = iv[i];
}
}
