private void btnDecipher_Click(object sender, EventArgs e)
{
DateTime dt1 = DateTime.Now;
MyCypher r = new MyCypher(this.Key, this.Rand);
Color clr = Color.White;
List <byte> file_bytes = new List <byte>();
Bitmap bmp = (Bitmap)pbOrg.BackgroundImage;
byte[] bytes = this.ciphered_bytes;
r.Decipher(ref bytes);
DateTime dt2 = DateTime.Now;
double totoal_time = dt2.Subtract(dt1).TotalMilliseconds;
double performance_mbps = 0d;
performance_mbps = bytes.Length * 8d; // total bits
performance_mbps /= 1024d; // total kilo bits
performance_mbps /= 1024d; // total mega bits
performance_mbps /= (totoal_time / 1000d); // total mega bits per second
lblMessage.Text = string.Format("Message: {0}\nTotal Time(ms): {1:N0}\nPerformance:{2:N3}(Mega bit/Sec)", "Decipher done. Loading results.", totoal_time, performance_mbps);
Application.DoEvents();
Bitmap bmp3 = new Bitmap(bmp.Width, bmp.Height);
int k = 0;
for (int x = 0; x < bmp.Width; x++)
{
for (int y = 0; y < bmp.Height; y++)
{
clr = Color.FromArgb(bytes[k], bytes[k + 1], bytes[k + 2]);
bmp3.SetPixel(x, y, clr);
k += 3;
}
}
pbDeciphered.BackgroundImage = (Image)bmp3;
MessageBox.Show(r.GetStat());
//MyCypher mcc = new MyCypher("123", "456");
//mcc.Decipher(ref this.cip_bytes);
//File.WriteAllBytes(Application.StartupPath + "\\B.jpg", cip_bytes);
}
public bool DoUnpack(string DestRootDirPath, string SourceFileName, string Psw)
{
// File construction:
// 1- random-seed (64 bit ulong) bytes 0,1,2,3,4,5,6,7
// 2- crc (32 bit uint) bytes 8,9,10,11
// 3- CIPHEROK (64 bit string) bytes 12,13,14,15
// 4- header-length (64 bit ulong) bytes 16,17,18,19,20,21,22,23
// 5- header-data (string) bytes 24,25, ...
// 6- body
uint crc = 0;
uint crc_check = 0;
Prompt(string.Format("Unpacking..."));
if (Directory.Exists(DestRootDirPath) == true)
{
try
{
Directory.Delete(DestRootDirPath, true);
}
catch (Exception ex)
{
MessageBox.Show("Unable to remove existing directory\n" + ex.Message);
return(false);
}
}
else
{
Directory.CreateDirectory(DestRootDirPath);
}
byte[] buff_read = new byte[1024 * 1024];
List <string> Log = new List <string>();
BinaryReader br = null;
BinaryWriter bw = null;
try
{
// if (File.Exists(SourceFileName) == false) return false;
br = new BinaryReader(new FileStream(SourceFileName, FileMode.Open));
// Random seed is written in plain-text (it is not ciphered)
ulong rnd_seed = br.ReadUInt64();
crc ^= GetCrc(rnd_seed);
//--------------------------------------------------
MyCypher mc = new MyCypher(Psw, rnd_seed);
crc_check = br.ReadUInt32();
ulong ciph_test = br.ReadUInt64();
byte[] bytes_cipher_test = BitConverter.GetBytes(ciph_test);
crc ^= GetCrc(ref bytes_cipher_test);
mc.Decipher(ref bytes_cipher_test);
string ciph_test_str = ASCIIEncoding.ASCII.GetString(bytes_cipher_test);
if (ciph_test_str != "CIPHEROK")
{
br.Close();
Log.Add("Invalid Password");
Prompt(string.Format("Invalid Password"));
return(false);
}
ulong header_length = br.ReadUInt64();
byte[] bytes_header_length = BitConverter.GetBytes(header_length);
crc ^= GetCrc(ref bytes_header_length);
mc.Decipher(ref bytes_header_length);
header_length = BitConverter.ToUInt64(bytes_header_length, 0);
//--------------------------------------------------
byte[] bytes_header = new byte[header_length];
br.Read(bytes_header, 0, bytes_header.Length);
crc ^= GetCrc(ref bytes_header);
mc.Decipher(ref bytes_header);
string header_str = ASCIIEncoding.ASCII.GetString(bytes_header);
//--------------------------------------------------
KeyValPair kvp = new KeyValPair(';', ':');
kvp.Fill(header_str);
int dir_cnt = kvp.GetValAsInt("D.CNT");
Prompt(string.Format("Directory Count: {0}", dir_cnt));
string dir = "";
for (int i = 0; i < dir_cnt; i++)
{
dir = DestRootDirPath + kvp.GetVal(string.Format("D.{0}", i));
Directory.CreateDirectory(dir);
}
int file_cnt = kvp.GetValAsInt("F.CNT");
Prompt(string.Format("File Count: {0}", file_cnt));
string file_full_name = "";
long file_offset = 0;
long file_length = 0;
for (int i = 0; i < file_cnt; i++)
{
string rel_file_name = kvp.GetVal(string.Format("F.{0}", i));
file_full_name = DestRootDirPath + rel_file_name;
Prompt(string.Format("Unpack File: {0}", file_full_name));
bw = new BinaryWriter(new FileStream(file_full_name, FileMode.Create));
file_offset = kvp.GetValAsInt64(string.Format("F.{0}.O", i));
file_offset += (long)header_length + 8 + 8 + 8 + 4 /*CRC*/;
file_length = kvp.GetValAsInt64(string.Format("F.{0}.L", i));
br.BaseStream.Seek(file_offset, SeekOrigin.Begin);
int cnt = 0;
long totlal_rem = file_length;
int read_cnt = 0;
while (true)
{
read_cnt = buff_read.Length;
if (totlal_rem < read_cnt)
{
read_cnt = (int)totlal_rem;
}
cnt = br.Read(buff_read, 0, read_cnt);
totlal_rem -= cnt;
crc ^= GetCrc(ref buff_read, cnt);
mc.Decipher(ref buff_read, cnt);
bw.Write(buff_read, 0, cnt);
if (cnt == 0)
{
break;
}
if (totlal_rem == 0)
{
break;
}
}
bw.Close();
}
Prompt("--------------------------------");
if (crc_check != crc)
{
Prompt("CRC Missmatch!");
return(false);
}
return(true);
}
catch (Exception ex)
{
if (bw != null)
{
try
{
bw.Close();
}
catch
{
//
}
}
//throw new Exception(string.Format("Unable to pack folder '{0}'.\n{1}", ex.Message));
return(false);
}
}
