/// <summary>
/// Шифратор
/// </summary>
/// <param name="data"></param>
/// <param name="key"></param>
/// <param name="cipher"></param>
/// <returns></returns>
private static byte[] Encrypt(string data, byte[] key, string cipher)
{
byte[] result;
int sizeBlock;
switch (cipher)
{
case "Нет":
result = Encoding.GetEncoding(866).GetBytes(data);
break;
case "Кузнечик":
Kuznyechik kuznyechik = new Kuznyechik();
sizeBlock = 16;
//Если количество блоков не пропорционально размеру блока, то дописываем символы заполнения
while (data.Length % sizeBlock != 0)
{
data += "┼";
}
//Кодируем текст в массив байт
byte[] dataBytes = Encoding.GetEncoding(866).GetBytes(data);
result = new byte[dataBytes.Length];
//В цикле формируем блоки...
for (int i = 0; i < dataBytes.Length; i += sizeBlock)
{
byte[] data8bytes = new byte[sizeBlock];
for (int k = 0; k < sizeBlock; k++)
{
data8bytes[k] = dataBytes[k + i];
}
//...и зашфровывем эти блоки с помощью ключа
byte[] dataE8bytes = kuznyechik.encrypt(data8bytes, key);
for (int k = 0; k < sizeBlock; k++)
{
result[k + i] = dataE8bytes[k];
}
}
break;
case "Магма":
//Аналогично Кузнечику
Magma magma = new Magma();
sizeBlock = 8;
while (data.Length % sizeBlock != 0)
{
data += "┼";
}
dataBytes = Encoding.GetEncoding(866).GetBytes(data);
result = magma.Encode(dataBytes, key);
break;
case "AES":
//Аналогично Кузнечику
sizeBlock = 16;
Aes aes = Aes.Create();
aes.Mode = CipherMode.ECB;
aes.KeySize = 256;
aes.BlockSize = sizeBlock * 8;
aes.Key = key;
aes.Padding = PaddingMode.Zeros;
ICryptoTransform encryptor = aes.CreateEncryptor();
while (data.Length % sizeBlock != 0)
{
data += "┼";
}
dataBytes = Encoding.GetEncoding(866).GetBytes(data);
result = encryptor.TransformFinalBlock(dataBytes, 0, dataBytes.Length);
break;
default:
result = null;
break;
}
return(result);
}
/// <summary>
/// Шифратор
/// </summary>
/// <param name="data"></param>
/// <returns></returns>
private Packet Encrypt(string data)
{
byte[] result;
byte[] dataBytes;
int sizeBlock;
string cipher = comboBox1.SelectedItem.ToString();
switch (cipher)
{
case "Нет":
result = Encoding.GetEncoding(866).GetBytes(data);
break;
case "Кузнечик":
Kuznyechik kuznyechik = new Kuznyechik();
sizeBlock = 16;
while (data.Length % sizeBlock != 0)
{
data += "┼";
}
dataBytes = Encoding.GetEncoding(866).GetBytes(data);
result = new byte[dataBytes.Length];
for (int i = 0; i < dataBytes.Length; i += sizeBlock)
{
byte[] data8bytes = new byte[sizeBlock];
for (int k = 0; k < sizeBlock; k++)
{
data8bytes[k] = dataBytes[k + i];
}
byte[] dataE8bytes = kuznyechik.encrypt(data8bytes, key);
for (int k = 0; k < sizeBlock; k++)
{
result[k + i] = dataE8bytes[k];
}
}
break;
case "Магма":
Magma magma = new Magma();
sizeBlock = 8;
while (data.Length % sizeBlock != 0)
{
data += "┼";
}
dataBytes = Encoding.GetEncoding(866).GetBytes(data);
result = magma.Encode(dataBytes, key);
break;
case "AES":
sizeBlock = 16;
Aes aes = Aes.Create();
aes.Mode = CipherMode.ECB;
aes.KeySize = 256;
aes.BlockSize = sizeBlock * 8;
aes.Key = key;
aes.Padding = PaddingMode.Zeros;
ICryptoTransform encryptor = aes.CreateEncryptor();
while (data.Length % sizeBlock != 0)
{
data += "┼";
}
dataBytes = Encoding.GetEncoding(866).GetBytes(data);
result = encryptor.TransformFinalBlock(dataBytes, 0, sizeBlock);
break;
default:
result = null;
break;
}
Packet packet = new Packet();
packet.data = result;
packet.cipher = cipher;
return(packet);
}
