JavaDataStructures/ECC/Helpers.java at master · benaich/JavaDataStructures · GitHub

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package ECC;

import java.io.BufferedReader;

import java.io.BufferedWriter;

import java.io.File;

import java.io.FileReader;

import java.io.FileWriter;

import java.io.IOException;

import java.math.BigInteger;

import java.util.ArrayList;

import java.util.Collections;

import java.util.List;

import java.util.logging.Level;

import java.util.logging.Logger;

public class Helpers {

static final File SUB_KEYS_FILE = new File("subkey");

static int[] toBinary(int n, int base) {

final int[] bits = new int[base];

for (int i = 0; i < base; i++) {

bits[i] = n >> i & 1;

}

return bits;

}

static String toBinary(BigInteger x) {

String ret = "";

for (int b : toBinary(x.intValue(), ECC.PAD)) {

ret = b + ret;

}

return ret;

}

static String[] toBinary(Point p) {

String[] tab = new String[ECC.PAD];

String str = toBinary(p.getX()) + "" + toBinary(p.getY());

for (int i = 0; i < str.length(); i = i + 2) {

tab[i / 2] = str.charAt(i) + "" + str.charAt(i + 1);

}

return tab;

}

static Matrix listToMatrix(List<Integer> list) {

int n, m, row, col;

n = ECC.PAD;

m = list.size() / (2 * n);

String[][] bits = new String[n][m];

for (int i = 0; i < list.size(); i = i + 2) {

row = i / 2 % n;

col = i / 2 / n;

bits[row][col] = list.get(i) + "" + list.get(i + 1);

}

return Matrix.make(bits);

}

static void saveSubKey(String t, int op, int a, int b, int c, int d) {

try {

BufferedWriter writer;

writer = new BufferedWriter(new FileWriter(SUB_KEYS_FILE, true));

writer.append(t + "/" + op + "/" + a + "/" + b + "/" + c + "/" + d);

writer.newLine();

writer.close();

} catch (IOException ex) {

Logger.getLogger(Helpers.class.getName()).log(Level.SEVERE, null, ex);

}

static void saveEncryptedMsg(char t, int op, int a, int b, int c, int d) {

try {

BufferedWriter writer;

writer = new BufferedWriter(new FileWriter(SUB_KEYS_FILE, true));

writer.append(t + "/" + op + "/" + a + "/" + b + "/" + c + "/" + d);

writer.newLine();

writer.close();

} catch (IOException ex) {

Logger.getLogger(Helpers.class.getName()).log(Level.SEVERE, null, ex);

}

static List<String> getSubKeys() {

List<String> keys = new ArrayList<>();

try {

BufferedReader reader;

reader = new BufferedReader(new FileReader(SUB_KEYS_FILE));

String line;

while ((line = reader.readLine()) != null) {

keys.add(line);

}

reader.close();

} catch (IOException ex) {

Logger.getLogger(Helpers.class.getName()).log(Level.SEVERE, null, ex);

}

SUB_KEYS_FILE.deleteOnExit();

Collections.reverse(keys);

return keys;

}

static void print(String[] tab) {

for (String tab1 : tab) {

System.out.println(tab1 + " ");

}

static void print(int[] tab) {

byte b;

for (int i : tab) {

b = (byte) i;

System.out.print(b);

}

System.out.println("");

}

static int getNotEqualTo(int a, int limit) {

int b;

do {

b = ECC.getRandom().nextInt(limit);

} while (b == a);

return b;

}

static void main(String[] args) {

for (int a : toBinary(15, 5)) {

System.out.print(a);

}

System.out.println(" :" + Character.toString((char) 32) + ":");

}

JavaDataStructures/ECC/Helpers.java at master · benaich/JavaDataStructures · GitHub

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