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Helpers.java
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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) + ":");
}
}