public static RSAKey ReadKey(string fileName)
{
RSAKey key = new RSAKey();
FileStream fileStream = new FileStream(fileName, FileMode.Open);
string fileContents;
using (StreamReader streamReader = new StreamReader(fileStream))
{
fileContents = streamReader.ReadToEnd();
}
fileStream.Close();
Int64[] dataArray = fileContents.Split().Select(x => Int64.Parse(x)).ToArray();
if (dataArray.Length != 2)
{
throw new Exception("Error reading key from file.");
}
key.Data = dataArray[0];
key.N = dataArray[1];
return(key);
}
public void GenerateKeys()
{
random = new Random((int)DateTime.Now.Ticks % Int32.MaxValue);
simpleList = GenerateSimpleNumbersList(1000);
Int64 P = GenerateRandomNumberInt16();
Int64 Q = P;
while (P == Q)
{
Q = GenerateRandomNumberInt16();
}
Int64 N = P * Q;
Int64 M = (P - 1) * (Q - 1);
Int64 E = 0;
do
{
E = GenerateRandomNumberInt32();
}while (EuclidsAlgorithm(E, M) != 1);
Int64 D = ExtendedEuclid(E, M);
RSAKey publicKey = new RSAKey();
publicKey.data = E;
publicKey.N = N;
RSAKey privateKey = new RSAKey();
privateKey.data = D;
privateKey.N = N;
KeyFileWriter.WriteKey(publicKey, PUBLIC_KEY_FILE_NAME);
KeyFileWriter.WriteKey(privateKey, PRIVATE_KEY_FILE_NAME);
}
public static void WriteKey(RSAKey key, string fileName)
{
using (StreamWriter streamWriter = new StreamWriter(fileName))
{
streamWriter.Write("{0} {1}", key.Data, key.N);
}
}
public void Decrypt(string sousreFileName, string destFileName, string keyFilename)
{
RSAKey privateKey = KeyFileReader.ReadKey(keyFilename);
FileStream sourseFileStream = new FileStream(sousreFileName, FileMode.Open);
FileStream destFileStream = new FileStream(destFileName, FileMode.Create);
using (BinaryWriter binaryWriter = new BinaryWriter(destFileStream))
{
using (BinaryReader binaryReader = new BinaryReader(sourseFileStream))
{
while (binaryReader.BaseStream.Position != binaryReader.BaseStream.Length)
{
binaryWriter.Write(Convert.ToByte(PowModFast(binaryReader.ReadInt64(), privateKey.data, privateKey.N)));
}
}
}
sourseFileStream.Close();
destFileStream.Close();
}
public void Encrypt(string sourceFileName, string destinationFileName, string keyFileName)
{
RSAKey publickey = KeyFileReader.ReadKey(keyFileName);
FileStream sourceFileStream = new FileStream(sourceFileName, FileMode.Open);
FileStream destinationFileStream = new FileStream(destinationFileName, FileMode.Create);
using (BinaryWriter binaryWriter = new BinaryWriter(destinationFileStream))
{
using (BinaryReader binaryReader = new BinaryReader(sourceFileStream))
{
while (binaryReader.BaseStream.Position != binaryReader.BaseStream.Length)
{
binaryWriter.Write(PowModFast(Convert.ToInt64(binaryReader.ReadByte()), publicKey.Data, publicKey.N));
}
}
}
sourceFileStream.Close();
destinationFileStream.Close();
}