public void Enc(String input_filename, String output_filename, String keystorename) {
readKeystore(keystorename);
buffer = new byte[n.bitLength() / 8 - (n.bitLength() % 8 == 0 ? 1 : 0)];
int out_bytes = n.bitLength() / 8 + (n.bitLength() % 8 != 0 ? 1 : 0);
FileInputStream input;
FileOutputStream output;
BigInteger number;
try {
input = new FileInputStream(input_filename);
output = new FileOutputStream(output_filename);
int bytes = 0;
while ((bytes = input.read(buffer)) != -1) {
if (bytes != buffer.length) for (int i = bytes; i < buffer.length; i++) buffer[i] = 0;
number = new BigInteger(1, buffer);
number = fastPower(number, e);
byte[] num_bytes = number.toByteArray();
if (num_bytes[0] == 0 && num_bytes.length != 1)
num_bytes = Arrays.copyOfRange(num_bytes, 1, num_bytes.length);
for (int i = 0; i < out_bytes - num_bytes.length; i++) output.write(new byte[] {0});
output.write(num_bytes);
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
