public async Task <ActionResult> Cipher(IFormFile file, IFormFile key, string name)
{
try
{
string basePath = _env.ContentRootPath;
string TempFile = basePath + @"\Temp\temp.txt";
string TempFile2 = basePath + @"\Temp\temp_key.txt";
RSAkey Key = new RSAkey();
byte[] FileBytes;
if (key.FileName.Substring(key.FileName.Length - 3, 3) != "key")
{
return(StatusCode(500));
}
using (FileStream fs = System.IO.File.Create(TempFile2))
{
await key.CopyToAsync(fs);
}
using (StreamReader reader = new StreamReader(TempFile2))
{
string base_string = reader.ReadToEnd();
string[] Key_Attributes = base_string.Split("|");
Key.modulus = BigInteger.Parse(Key_Attributes[0]);
Key.power = BigInteger.Parse(Key_Attributes[1]);
}
using (FileStream fs = System.IO.File.Create(TempFile))
{
await file.CopyToAsync(fs);
}
RSA Cipher = new RSA();
if (file.FileName.Substring(file.FileName.Length - 3, 3) == "rsa")
{
if (Cipher.Decipher(TempFile, out FileBytes, Key) == false)
{
return(StatusCode(500));
}
return(File(FileBytes, "text/plain", name + ".txt"));
}
else
{
if (Cipher.Cipher(TempFile, out FileBytes, Key) == false)
{
return(StatusCode(500));
}
return(File(FileBytes, "text/plain", name + ".rsa"));
}
}
catch (Exception)
{
return(StatusCode(500));
}
}
public static void Main(string[] args)
{
string
fileNameIn = "zo_attack1.wav"
, fileNameInOut = "temp.wav"
, fileNameOut = "!zo_attack1.wav";
RSA rsa = new RSA();
FileStream inputFileStream, outputFileStream;
// szyfrowanie
using (inputFileStream = new FileStream(@fileNameIn, FileMode.Open))
{
using (outputFileStream = new FileStream(@fileNameInOut, FileMode.Create))
{
byte[] inputBytes = new byte[rsa.MaxCountOfBytes];
inputBytes[0] = 0x80;
int nuberOfBytes;
while ((nuberOfBytes = inputFileStream.Read(inputBytes, 1, rsa.MaxCountOfBytes - 1)) != 0)
{
BigInteger inputBlock = new BigInteger(inputBytes, nuberOfBytes + 1);
BigInteger cipheredBlock = rsa.Cipher(inputBlock);
BigInteger encipheredBlock = rsa.Encipher(new BigInteger(cipheredBlock.getBytes(), cipheredBlock.getBytes().Length));
if (!encipheredBlock.Equals(inputBlock))
{
throw new Exception();
}
outputFileStream.WriteByte((byte)(nuberOfBytes));
outputFileStream.WriteByte((byte)(cipheredBlock.getBytes().Length));
outputFileStream.Write(cipheredBlock.getBytes(), 0, cipheredBlock.getBytes().Length);
}
}
}
// deszyfrowanie
using (inputFileStream = new FileStream(@fileNameInOut, FileMode.Open))
{
using (outputFileStream = new FileStream(@fileNameOut, FileMode.Create))
{
byte[] inputBytes = new byte[rsa.N.getBytes().Length];
do
{
int plainTextBytes = inputFileStream.ReadByte();
if (plainTextBytes == -1)
{
break;
}
int cipheredBytesLenght = inputFileStream.ReadByte();
BigInteger inputBlock = inputFileStream.Read(inputBytes, 0, cipheredBytesLenght);
BigInteger encipheredBlock = rsa.Encipher(inputBlock);
outputFileStream.Write(encipheredBlock.getBytes(), 1, plainTextBytes);
}while (true);
}
}
}