public static void Encrypt(byte[] source)
{
if (!GetPublicKey())
{
return;
}
StringBuilder bits = new StringBuilder(source.ToBitsString());
StringBuilder result = new StringBuilder();
int rsaBlockSize = blockSize;
int addBitsCount = rsaBlockSize - (bits.Length % rsaBlockSize);
bits.Append(Extensions.GetRandomString(addBitsCount));
string add = Convert.ToString(addBitsCount, 2);
bits.Append(add.PadLeftRandom(blockSize));
for (int i = 0; i < bits.Length; i += rsaBlockSize)
{
string blockMessage = bits.ToString(i, rsaBlockSize);
result.Append(EncryptBlock(blockMessage));
}
byte[] encrypted = result.ToString().ToBytes().ToArray();
CustomFile.WriteAllBytes(encrypted, "C:\\Users\\vlady\\Desktop\\result.txt");
}
private static bool GetPublicKey()
{
byte[] key = CustomFile.OpenFile("открытого ключа");
if (key.Length != Generate.KEY_LENGT_BYTE / 2 + 1)
{
Console.WriteLine("Ключ поврежден!");
return(false);
}
n = new BigInteger(key.SubArray(0, Generate.KEY_LENGT_BYTE / 2 + 1));
blockSize = (int)Math.Floor(BigInteger.Log(n, 2));
Console.WriteLine("Выполнение...");
return(true);
}
public static void Main()
{
Stopwatch watch;
while (true)
{
Console.Clear();
Console.WriteLine("Алгоритм RSA\n" +
"Выберите режим работы:\n" +
"1 - Шифрование\n" +
"2 - Дешифрование\n" +
"3 - Генерация ключей\n" +
"4 - Выход");
switch (Console.ReadKey(true).KeyChar)
{
case '1':
var fileNameEncrypt = CustomFile.OpenFile("для шифрования");
watch = Stopwatch.StartNew();
Rsa.Encrypt(fileNameEncrypt);
ShowRunTime(watch.Elapsed);
Exit();
return;
case '2':
var fileNameDecrypt = CustomFile.OpenFile("для расшифрования");
watch = Stopwatch.StartNew();
Rsa.Decrypt(fileNameDecrypt);
ShowRunTime(watch.Elapsed);
Exit();
return;
case '3':
Console.Clear();
watch = Stopwatch.StartNew();
Rsa.Generate.GenerateKey();
ShowRunTime(watch.Elapsed);
Exit();
break;
case '4':
return;
default:
break;
}
}
}
public static void Decrypt(byte[] source)
{
if (source.Length <= TRASH_BLOCK)
{
ShowErrorMessage();
return;
}
if (!GetPrivateKey())
{
return;
}
StringBuilder result = new StringBuilder();
int rsaBlockSize = Generate.KEY_LENGT_BITS;
StringBuilder bits = new StringBuilder(source.ToBitsString());
if (bits.Length % rsaBlockSize != 0)
{
ShowErrorMessage();
return;
}
for (int i = 0; i < bits.Length; i += rsaBlockSize)
{
string blockMessage = bits.ToString(i, rsaBlockSize);
result.Append(DecryptBlock(blockMessage));
}
int tempSize = (int)(result.ToString().Substring(result.Length - 16).ToBigInteger());
int addBitsCount = tempSize + blockSize;
string resultString = result.ToString().Substring(0, result.Length - addBitsCount);
CustomFile.WriteAllBytes(resultString.ToBytes());
}