Example usage for java.security SecureRandom nextBytes

Introduction

In this page you can find the example usage for java.security SecureRandom nextBytes.

Prototype

@Override
public void nextBytes(byte[] bytes)

Source Link

Document

Generates a user-specified number of random bytes.

Usage

From source file:Main.java

public static void main(String[] argv) throws Exception {
    SecureRandom sr = new SecureRandom();

    byte[] bytes = new byte[8];
    sr.nextBytes(bytes);
    System.out.println(Arrays.toString(bytes));
}

From source file:Main.java

public static void main(String[] argv) throws Exception {
    SecureRandom sr = SecureRandom.getInstance("SHA1PRNG");

    byte[] bytes = new byte[8];
    sr.nextBytes(bytes);
    System.out.println(Arrays.toString(bytes));
}

From source file:Main.java

public static void main(String[] argv) throws Exception {
    SecureRandom sr = SecureRandom.getInstance("SHA1PRNG");

    byte[] bytes = new byte[1024 / 8];
    sr.nextBytes(bytes);
}

From source file:MainClass.java

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

    SecureRandom random = new SecureRandom();
    byte[] keyBytes = new byte[20];
    random.nextBytes(keyBytes);
    SecretKeySpec key = new SecretKeySpec(keyBytes, "HMACSHA1");

    System.out.println("Key:" + new BASE64Encoder().encode(key.getEncoded()));

    Mac mac = Mac.getInstance("HmacSHA1");
    mac.init(key);/*from  w w  w . j a va 2  s .c  o  m*/

    mac.update("test".getBytes("UTF8"));
    byte[] result = mac.doFinal();

    System.out.println("MAC: " + new BASE64Encoder().encode(result));
}

From source file:Main.java

public static void main(String[] args) throws NoSuchAlgorithmException {
    int numBytes = (new Integer("1111")).intValue();

    SecureRandom srand = new SecureRandom(new byte[] { 1, 2, 3, 4 });

    byte[] bytes = new byte[numBytes];
    srand.nextBytes(bytes);
    System.out.println(new String(bytes));
}

From source file:Main.java

public static void main(String[] args) throws NoSuchAlgorithmException {
    int numBytes = (new Integer("1111")).intValue();

    SecureRandom srand = SecureRandom.getInstance("SHA1PRNG");
    srand.setSeed(new byte[] { 1, 2, 3, 4 });
    byte[] bytes = new byte[numBytes];
    srand.nextBytes(bytes);
    System.out.println(new String(bytes));
}

From source file:MainClass.java

public static void main(String[] args) throws NoSuchAlgorithmException {
    int numBytes = (new Integer("1111")).intValue();
    long seed = 01;
    if (args.length > 1)
        seed = (new Long("1111111111")).longValue();
    SecureRandom srand = SecureRandom.getInstance("SHA1PRNG");
    if (seed != 01)
        srand.setSeed(seed);/* ww w.  jav a 2  s .  c o m*/
    byte[] bytes = new byte[numBytes];
    srand.nextBytes(bytes);
    System.out.println(new String(bytes));
}

From source file:MainClass.java

public static void main(String args[]) throws Exception {
    Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
    SecureRandom rng = SecureRandom.getInstance("SHA1PRNG");
    rng.setSeed(711);//from   w  w  w.j av a 2s . com

    int numberToGenerate = 999;
    byte randNumbers[] = new byte[numberToGenerate];

    rng.nextBytes(randNumbers);
    for (int j = 0; j < numberToGenerate; j++) {
        System.out.print(randNumbers[j] + " ");
    }

}

From source file:Main.java

public static void main(String[] args) throws NoSuchAlgorithmException {
    int numBytes = (new Integer("1111")).intValue();

    SecureRandom srand = new SecureRandom(new byte[] { 1, 2, 3, 4 });

    Provider provider = srand.getProvider();
    System.out.println(provider.getName());

    byte[] bytes = new byte[numBytes];
    srand.nextBytes(bytes);
    System.out.println(bytes);//from   www. ja v  a2s .  c o  m
}

From source file:Main.java

public static void main(String[] args) throws NoSuchAlgorithmException {
    int numBytes = (new Integer("1111")).intValue();

    SecureRandom srand = new SecureRandom(new byte[] { 1, 2, 3, 4 });

    Provider provider = srand.getProvider();

    SecureRandom newRandom = SecureRandom.getInstance("SHA1PRNG", provider);

    System.out.println(provider.getName());

    byte[] bytes = new byte[numBytes];
    srand.nextBytes(bytes);
    System.out.println(bytes);//from  w w w .j  ava2 s . c  o m
}