Example usage for javax.crypto KeyGenerator getInstance

Introduction

In this page you can find the example usage for javax.crypto KeyGenerator getInstance.

Prototype

public static final KeyGenerator getInstance(String algorithm) throws NoSuchAlgorithmException

Source Link

Document

Returns a KeyGenerator object that generates secret keys for the specified algorithm.

Usage

From source file:Main.java

public static void main(String[] argv) throws Exception {

    KeyGenerator keyGen = KeyGenerator.getInstance("HmacMD5");
    SecretKey key = keyGen.generateKey();

    // Generate a key for the HMAC-SHA1 keyed-hashing algorithm
    keyGen = KeyGenerator.getInstance("HmacSHA1");
    key = keyGen.generateKey();//w w  w  .  jav a  2  s  .  com
}

From source file:Main.java

public static void main(String[] argv) throws Exception {
    KeyGenerator keyGen = KeyGenerator.getInstance("HmacMD5");
    SecretKey key = keyGen.generateKey();

    Mac mac = Mac.getInstance(key.getAlgorithm());
    mac.init(key);/* ww  w  .  ja  va2s. c o  m*/

    String str = "This message will be digested";

    byte[] utf8 = str.getBytes("UTF8");
    byte[] digest = mac.doFinal(utf8);

    String digestB64 = new sun.misc.BASE64Encoder().encode(digest);
    System.out.println(digestB64);
}

From source file:Main.java

public static void main(String[] argv) throws Exception {
    // Generate a DES key
    KeyGenerator keyGen = KeyGenerator.getInstance("DES");
    SecretKey key = keyGen.generateKey();

    // Generate a Blowfish key
    keyGen = KeyGenerator.getInstance("Blowfish");
    key = keyGen.generateKey();/* w w  w.j av a2  s. com*/

    // Generate a triple DES key
    keyGen = KeyGenerator.getInstance("DESede");
    key = keyGen.generateKey();
}

From source file:MainClass.java

public static void main(String[] args) throws Exception {

    KeyGenerator keyGenerator = KeyGenerator.getInstance("Blowfish");
    keyGenerator.init(128);// w w w  .j  a  v a2 s .c  om
    SecretKey key = keyGenerator.generateKey();

    Cipher cipher = Cipher.getInstance("Blowfish/ECB/PKCS5Padding");
    cipher.init(Cipher.ENCRYPT_MODE, key);

    byte[] cipherText = cipher.doFinal("This is a test.".getBytes("UTF8"));

    System.out.println(new String(cipherText));
}

From source file:MainClass.java

public static void main(String[] args) throws Exception {
    KeyGenerator keyGenerator = KeyGenerator.getInstance("DESede");
    keyGenerator.init(168);/*from ww  w  . j  ava 2 s  .co  m*/
    Key key = keyGenerator.generateKey();

    Cipher cipher = Cipher.getInstance("DESede/ECB/PKCS5Padding");
    cipher.init(Cipher.ENCRYPT_MODE, key);

    byte[] ciphertext = cipher.doFinal("text".getBytes("UTF8"));

    for (int i = 0; i < ciphertext.length; i++) {
        System.out.print(ciphertext[i] + " ");
    }

    cipher.init(Cipher.DECRYPT_MODE, key);

    byte[] decryptedText = cipher.doFinal(ciphertext);

    System.out.println(new String(decryptedText, "UTF8"));
}

From source file:Main.java

public static void main(String[] argv) throws Exception {
    // Generate a key
    KeyGenerator keyGen = KeyGenerator.getInstance("DESede");
    SecretKey key = keyGen.generateKey();

    // Get the bytes of the key
    byte[] keyBytes = key.getEncoded();
    int numBytes = keyBytes.length;

    // The bytes can be converted back to a SecretKey
    SecretKey key2 = new SecretKeySpec(keyBytes, "DESede");
    boolean b = key.equals(key2); // true
}

From source file:Main.java

public static void main(String[] argv) throws Exception {

    SecretKey key = KeyGenerator.getInstance("DES").generateKey();

    Cipher ecipher = Cipher.getInstance("DES");
    ecipher.init(Cipher.ENCRYPT_MODE, key);

    SealedObject so = new SealedObject(new MySecretClass(), ecipher);

    String algoName = so.getAlgorithm(); // DES

    Cipher dcipher = Cipher.getInstance("DES");
    dcipher.init(Cipher.DECRYPT_MODE, key);
    MySecretClass o = (MySecretClass) so.getObject(dcipher);

}

From source file:MainClass.java

public static void main(String args[]) throws Exception {
    KeyGenerator kg = KeyGenerator.getInstance("DES");
    Cipher c = Cipher.getInstance("DES/CBC/PKCS5Padding");
    Key key = kg.generateKey();// w  w  w . j  a  v a  2s . co m

    c.init(Cipher.ENCRYPT_MODE, key);
    byte input[] = "Stand and unfold yourself".getBytes();
    byte encrypted[] = c.doFinal(input);
    byte iv[] = c.getIV();

    IvParameterSpec dps = new IvParameterSpec(iv);
    c.init(Cipher.DECRYPT_MODE, key, dps);
    byte output[] = c.doFinal(encrypted);
    System.out.println(new String(output));
}

From source file:MainClass.java

public static void main(String[] args) throws Exception {
    String text = "java2s";

    KeyGenerator keyGenerator = KeyGenerator.getInstance("Blowfish");
    keyGenerator.init(128);//w ww .ja va 2  s .  c  om

    Key key = keyGenerator.generateKey();

    Cipher cipher = Cipher.getInstance("Blowfish/ECB/PKCS5Padding");
    cipher.init(Cipher.ENCRYPT_MODE, key);

    byte[] ciphertext = cipher.doFinal(text.getBytes("UTF8"));

    for (int i = 0; i < ciphertext.length; i++) {
        System.out.print(ciphertext[i] + " ");
    }
    cipher.init(Cipher.DECRYPT_MODE, key);
    byte[] decryptedText = cipher.doFinal(ciphertext);

    System.out.println(new String(decryptedText, "UTF8"));
}

From source file:MainClass.java

public static void main(String[] args) throws Exception {
    String alg = "HmacMD5";
    Mac mac = Mac.getInstance(alg);
    KeyGenerator kg = KeyGenerator.getInstance(alg);
    SecretKey key = kg.generateKey();
    mac.init(key);/*from w  w w.  j  a  v a  2 s  .  c  o  m*/
    mac.update("test".getBytes());
    byte[] b = mac.doFinal();
    System.out.println(new String(b));

}