public void GetRoundSnapshot()
{
for (int i = 0; i < 25; i++)
{
EncodingPlan result = instance.GetEncodingPlan(blockLength: 64);
Assert.IsNotNull(result);
Assert.IsTrue(result.WordSize >= BlockEncoder.MinWordSize && result.WordSize <= BlockEncoder.MaxWordSize);
List <IWordEncoder> transformations = result.Transformations;
Assert.IsTrue(transformations.Count > 0);
}
}
public byte[] EncodeBlock(EncodingPlan plan, byte[] block)
{
byte[] result = new byte[block.Length];
List <BitArray> words = new BitArray(block).ToWords(plan.WordSize);
int wordCount = words.Count;
for (int i = 0; i < wordCount; i++)
{
IWordEncoder encoder = plan.Transformations[i];
BitArray encoded = encoder.Encode(words[i]);
words[i] = encoded;
}
words.ToBitArray().CopyTo(result, 0);
return(result);
}
public byte[] DecodeBlock(EncodingPlan plan, byte[] block)
{
byte[] result = new byte[block.Length];
List <BitArray> buffer = new List <BitArray> {
};
List <BitArray> words = new BitArray(block).ToWords(plan.WordSize);
for (int i = words.Count - 1; i >= 0; i--)
{
IWordEncoder decoder = plan.Transformations[i];
BitArray decoded = decoder.Decode(words[i]);
buffer.Insert(0, decoded);
}
buffer.ToBitArray().CopyTo(result, 0);
return(result);
}
public EncodingPlan GetEncodingPlan(int blockLength)
{
EncodingPlan result = new EncodingPlan();
result.WordSize = wordSize;
int transformsCount = Transforms.Length;
int bitsInBlock = blockLength * 8;
int remainder = bitsInBlock % wordSize;
bool hasRemainder = remainder != 0;
int wordCount = (int)Math.Ceiling((double)bitsInBlock / wordSize);
for (int index = 0; index < wordCount; index++)
{
int wordLength = (index == wordCount - 1 && hasRemainder ? remainder : wordSize);
IWordEncoder encoder = (IWordEncoder)Activator.CreateInstance(transforms[index % transformsCount].GetType());
encoder.WordSize = wordLength;
encoder.Seed = KeySchedule.GetNext(encoder.SeedSize);
result.Transformations.Add(encoder);
}
return(result);
}
