BAB V : Kesimpulan dan Saran
DAFTAR PUSTAKA
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RSA.java package voter; import java.io.* import java.math.*; import java.security.*; import java.util.*; import org.apache.commons.io.FileUtils; import sun.security.pkcs11.wrapper.Constants; public class RSA {
private BigInteger n, d, e;
String newLine = System.getProperty("line.separator"); private int bitlen = 1024;
/** Create an instance that can both encrypt and decrypt. */ public RSA(int bits) {
bitlen = bits;
SecureRandom r = new SecureRandom();
BigInteger p = new BigInteger(bitlen/2 , 100, r); BigInteger q = new BigInteger(bitlen/2 , 100, r); n = p.multiply(q); BigInteger m = (p.subtract(BigInteger.ONE)).multiply(q .subtract(BigInteger.ONE)); do { e = new BigInteger(bitlen, r); }while( (e.compareTo(m) != 1) || (e.gcd(m).compareTo(BigInteger.valueOf(1)) != 0)); d = e.modInverse(m); }
/** Encrypt the given plaintext message. */
public synchronized String encrypt(String message) {
PrintingTask.print("Modulus : " + newLine + n + newLine + newLine + "Private Key : " + newLine + d);
return (new BigInteger(message.getBytes())).modPow(e, n).toString();
}
public synchronized BigInteger encryptWithKey(BigInteger message) { BigInteger pubKey = null;
BigInteger modulus = null; try {
File dist = new File("ext/Dist.txt");
pubKey = new BigInteger(FileUtils.readLines(dist).get(0)); modulus = new BigInteger(FileUtils.readLines(dist).get(2)); } catch (Exception ex) {
Logger.getLogger(RSA.class.getName()).log(Level.SEVERE, null, ex);
}
//return new String((new
BigInteger("test".getBytes())).modPow(pubKey, modulus).toByteArray());
return message.modPow(pubKey, modulus); }
/** Encrypt the given plaintext message. */
public synchronized BigInteger encrypt(BigInteger message) { PrintingTask.print("Modulus : " + newLine + n + newLine + newLine + "Private Key : " + newLine + d);
return message.modPow(e, n); }
/** Decrypt the given ciphertext message. */
public synchronized String decrypt(String message, BigInteger priKey, BigInteger modulus) {
return new String((new BigInteger(message)).modPow(priKey, modulus).toByteArray());
}
public synchronized BigInteger decryptWithKey(BigInteger message) { BigInteger priKey = null;
BigInteger modulus = null; try {
File dist = new File("ext/Dist.txt");
priKey = new BigInteger(FileUtils.readLines(dist).get(1)); modulus = new BigInteger(FileUtils.readLines(dist).get(2)); } catch (Exception ex) {
Logger.getLogger(RSA.class.getName()).log(Level.SEVERE, null, ex);
}
return message.modPow(priKey, modulus); }
/** Decrypt the given ciphertext message. */
public synchronized BigInteger decrypt(BigInteger message, BigInteger priKey, BigInteger modulus) {
return message.modPow(priKey, modulus); }
public synchronized BigInteger decrypt(BigInteger message) { System.out.println("Ini priKey : " +d );
System.out.println("Ini Mod : " +n ); return message.modPow(d, n);
}
public static void main(String[] args) { } } AES.java package TPS; import java.io.*; import java.math.*; import java.security.*; import java.util.*; import javax.crypto.*;
public class AES {
Cipher ecipher; Cipher dcipher;
{
// Create an 8-byte initialization vector byte[] iv = new byte[]
{
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f
};
AlgorithmParameterSpec paramSpec = new IvParameterSpec(iv); try { ecipher = Cipher.getInstance("AES/CBC/PKCS5Padding"); dcipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
// CBC requires an initialization vector ecipher.init(Cipher.ENCRYPT_MODE, key, paramSpec); dcipher.init(Cipher.DECRYPT_MODE, key, paramSpec); } catch (Exception e) { e.printStackTrace(); } }
// Buffer used to transport the bytes from one stream to another byte[] buf = new byte[1024];
public static SecretKey generateAESKey() throws NoSuchAlgorithmException
{
KeyGenerator keyGenerator = KeyGenerator.getInstance("AES"); keyGenerator.init(128); // 128 default; 192 and 256 also possible
SecretKey key = keyGenerator.generateKey(); WriteKeytoFile(key);
return key; }
public static void WriteKeytoFile(SecretKey key) { FileWriter fileWriter = null;
byte[] encodedKey = key.getEncoded(); try {
String strKey = new BigInteger(encodedKey).toString(16); File file = new
File(TPSPanel.TPS+TPSPanel.Distribute+"key"); fileWriter = new FileWriter(file); fileWriter.write(strKey); } catch(Exception e) { e.printStackTrace(); }finally { try { fileWriter.close(); } catch (IOException ex) {
ex.printStackTrace(); }
} }
public static String readKeyFile( String file ) throws IOException {
BufferedReader reader = new BufferedReader( new FileReader (file));
String line = null;
StringBuilder stringBuilder = new StringBuilder(); while( ( line = reader.readLine() ) != null ) { stringBuilder.append( line );
}
String strKey = stringBuilder.toString(); return strKey;
}
public static SecretKey LoadKey(String strKey) {
byte[] encoded = new BigInteger(strKey, 16).toByteArray(); SecretKey key = new SecretKeySpec(encoded, "AES");
return key; }
public void encrypt(InputStream in, OutputStream out) {
try {
out = new CipherOutputStream(out, ecipher); int numRead = 0;
while ((numRead = in.read(buf)) >= 0) { out.write(buf, 0, numRead); } out.close(); in.close(); } catch (java.io.IOException e) { } }
public void decrypt(InputStream in, OutputStream out) {
try {
in = new CipherInputStream(in, dcipher); int numRead = 0;
while ((numRead = in.read(buf)) >= 0) { out.write(buf, 0, numRead); } out.close(); } catch (java.io.IOException e) { } }
public static void main(String args[]) {
} }