public void ReverseBitArrayBitsShouldReturnBitArrayInReverseOrder(string label, bool[] bits)
{
var ba = new BitArray(bits);
var subject = MsbLsbConversionHelpers.ReverseBitArrayBits(ba);
for (int i = 0; i < subject.Length; i++)
{
Assert.AreEqual(ba[i], subject[subject.Length - 1 - i]);
}
}
private static BitString ConvertEndianness(BitString message)
{
// For a small example... 60 01 (hex) = 0110 0000 0000 0001 (binary)
// should turn into 06 80 (hex) = 0000 0110 1000 0000 (binary
var messageLen = message.BitLength;
var reversedBits = MsbLsbConversionHelpers.ReverseBitArrayBits(message.Bits);
var normalizedBits = MsbLsbConversionHelpers.ReverseByteOrder(new BitString(reversedBits).ToBytes());
message = new BitString(normalizedBits);
var hex = message.ToHex();
message = new BitString(hex, messageLen, false);
return(message);
}
protected BitString Convert168BitKeyTo192BitKey(BitString origKey)
{
if (origKey.BitLength != 168)
{
throw new ArgumentException("Not a valid key, needs 168 bits");
}
var bsReverse = new BitString(MsbLsbConversionHelpers.ReverseBitArrayBits(origKey.Bits));
var newBs = new BitString(0);
for (var i = 0; i < bsReverse.BitLength; i++)
{
newBs = newBs.ConcatenateBits(new BitString(new BitArray(new[] { bsReverse.Bits[i] })));
if ((i + 1) % 7 == 0)
{
newBs = newBs.ConcatenateBits(BitString.Zero());
}
}
return(newBs);
}
private static BitString ConvertEndianness(BitString message)
{
// This is kinda gross... The message input is in the correct byte order but reversed bit order
// So we must reverse the bits, then reverse the bytes to put everything in the correct order
//
// For a small example... 60 01 (hex) = 0110 0000 0000 0001 (binary)
// should turn into 06 80 (hex) = 0000 0110 1000 0000 (binary
var messageLen = message.BitLength;
// Convert to big endian byte order but little endian bit order
var reversedBits = MsbLsbConversionHelpers.ReverseBitArrayBits(message.Bits);
var normalizedBits = MsbLsbConversionHelpers.ReverseByteOrder(new BitString(reversedBits).ToBytes());
// After the byte conversion make sure the result is the correct length
// The constructor here handles this for us
message = new BitString(normalizedBits);
var hex = message.ToHex();
message = new BitString(hex, messageLen, false);
return(message);
}
