private bool[] generateStream(byte[] kc, uint count)
{
bool[] keytsream = new bool[114];
CryptA5 A5Algo = new CryptA5(kc);
A5Algo.Count = count;
A5Algo.RunAlgo();
Array.Copy(A5Algo.DownlinkKey, keytsream, keytsream.Length);
return(keytsream);
}
private void btnEncryptToL1_Click(object sender, EventArgs e)
{
bool error = false;
if (textL2Data.Text.Length != 23 * 2 && textL2Data.Text.Length != 23 * 3 - 1)
{
MessageBox.Show(this, "Supply 23 bytes L2 data ...");
error = true;
}
if (textKc.Text.Length != 8 * 2)
{
MessageBox.Show(this, "Supply 8 bytes Kc ...");
error = true;
}
if (textFN.Text.Length == 0)
{
MessageBox.Show(this, "Supply frame number ...");
error = true;
}
if (error)
{
textL1crypt0.Text = "";
textL1crypt1.Text = "";
textL1crypt2.Text = "";
textL1crypt3.Text = "";
return;
}
byte[] l2data = new byte[23];
ByteUtil.BytesFromString(textL2Data.Text, ref l2data);
bool[][] l1bursts = new bool[4][];
for (int i = 0; i < l1bursts.Length; i++)
{
l1bursts[i] = new bool[114];
}
SDCCHBurst sdcch = new SDCCHBurst();
sdcch.L2DataAdd(l2data);
sdcch.L2ToL1Convert();
sdcch.L1BurstIGet(ref l1bursts);
/* crypt it */
byte[] kc = new byte[8];
ByteUtil.BytesFromString(textKc.Text, ref kc);
GSMParameters param = new GSMParameters();
param.FN = uint.Parse(textFN.Text);
CryptA5 A5Algo = new CryptA5(kc);
if (radioSameFN.Checked)
{
A5Algo.CryptDownlink(l1bursts[0], param.Count);
A5Algo.CryptDownlink(l1bursts[1], param.Count);
A5Algo.CryptDownlink(l1bursts[2], param.Count);
A5Algo.CryptDownlink(l1bursts[3], param.Count);
}
else
{
A5Algo.CryptDownlink(l1bursts[0], param.Count);
param.FN++;
A5Algo.CryptDownlink(l1bursts[1], param.Count);
param.FN++;
A5Algo.CryptDownlink(l1bursts[2], param.Count);
param.FN++;
A5Algo.CryptDownlink(l1bursts[3], param.Count);
}
textL1crypt0.Text = ByteUtil.BitsToString(l1bursts[0]);
textL1crypt1.Text = ByteUtil.BitsToString(l1bursts[1]);
textL1crypt2.Text = ByteUtil.BitsToString(l1bursts[2]);
textL1crypt3.Text = ByteUtil.BitsToString(l1bursts[3]);
}
