Example usage for java.security SecureRandom setSeed

Introduction

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

Prototype

@Override
public void setSeed(long seed) 

Source Link

Document

Reseeds this random object, using the eight bytes contained in the given long seed .

Usage

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);//from  w ww.j av  a 2  s  .c  o  m
    System.out.println(new String(bytes));
}

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From source file:MainClass.java

public static void main(String args[]) throws Exception {
    SecureRandom ran = SecureRandom.getInstance("SHA1PRNG", "SUN");
    ran.setSeed(101L);
    ran.setSeed(101L);/*from www .  j ava  2s  .  c o m*/
    byte[] seeds = ran.getSeed(24);
    for (int i = 0; i < seeds.length; i++) {
        System.out.println("Seed[" + i + "]:" + seeds[i]);
    }
}

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From source file:cn.lynx.emi.license.GenerateKeyPairs.java

public static void main(String[] args) throws NoSuchAlgorithmException {
    KeyPairGenerator keygen = KeyPairGenerator.getInstance("RSA");
    SecureRandom secrand = new SecureRandom();
    secrand.setSeed("cn.lynx.emi".getBytes());
    keygen.initialize(4096, secrand);// w  w  w  . ja v  a 2s . c om
    KeyPair keys = keygen.genKeyPair();

    PublicKey pubkey = keys.getPublic();
    PrivateKey prikey = keys.getPrivate();

    String myPubKey = Base64.encodeBase64String(pubkey.getEncoded());
    String myPriKey = Base64.encodeBase64String(prikey.getEncoded());
    System.out.println(prikey);
    System.out.println("pubKey=" + myPubKey);
    System.out.println("priKey=" + myPriKey);
}

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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);

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

    rng.nextBytes(randNumbers);//from www .  j  a v a2 s  .co m
    for (int j = 0; j < numberToGenerate; j++) {
        System.out.print(randNumbers[j] + " ");
    }

}

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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);
    byte[] bytes = new byte[numBytes];
    srand.nextBytes(bytes);/*w  w  w . j a v a 2  s.com*/
    System.out.println(new String(bytes));
}

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From source file:MainClass.java

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

    KeyGenerator keyGen = KeyGenerator.getInstance("DES");
    SecureRandom random = SecureRandom.getInstance("SHA1PRNG", "SUN");
    random.setSeed(101L);
    keyGen.init(56, random);/* w  w  w  . j  a va  2 s.c o m*/
    SecretKey sKey = keyGen.generateKey();
    SecretKeyFactory kfactory = SecretKeyFactory.getInstance("DES");

    DESKeySpec kspec = (DESKeySpec) kfactory.getKeySpec(sKey, DESKeySpec.class);

    System.out.println(sKey);
    FileOutputStream fos = new FileOutputStream("secretKeys");
    ObjectOutputStream oos = new ObjectOutputStream(fos);

    oos.writeObject(kspec.getKey());

    FileInputStream fin = new FileInputStream("secretKeys");
    ObjectInputStream ois = new ObjectInputStream(fin);

    byte[] kMaterial = (byte[]) ois.readObject();

    DESKeySpec keyspec = new DESKeySpec(kMaterial);
    SecretKey newKey = kfactory.generateSecret(keyspec);
    System.out.println(newKey);
    System.out.println("Do the keys equal :" + newKey.equals(sKey));

}

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From source file:MainClass.java

public static void main(String args[]) throws Exception {
    KeyPairGenerator keyGen = KeyPairGenerator.getInstance("DSA");
    SecureRandom random = SecureRandom.getInstance("SHA1PRNG", "SUN");
    random.setSeed(101L);
    keyGen.initialize(1024, random);/*  w  w w  .  j  a va 2  s . c o  m*/
    KeyPair keypair = keyGen.generateKeyPair();

    KeyFactory kfactory = KeyFactory.getInstance("DSA");

    DSAPublicKeySpec kspec = (DSAPublicKeySpec) kfactory.getKeySpec(keypair.getPublic(),
            DSAPublicKeySpec.class);

    System.out.println(keypair.getPublic());
    FileOutputStream fos = new FileOutputStream("publicKeys");
    ObjectOutputStream oos = new ObjectOutputStream(fos);

    oos.writeObject(kspec.getY());
    oos.writeObject(kspec.getP());
    oos.writeObject(kspec.getQ());
    oos.writeObject(kspec.getG());

    FileInputStream fin = new FileInputStream("publicKeys");
    ObjectInputStream ois = new ObjectInputStream(fin);

    BigInteger Y = (BigInteger) ois.readObject();
    BigInteger P = (BigInteger) ois.readObject();
    BigInteger Q = (BigInteger) ois.readObject();
    BigInteger G = (BigInteger) ois.readObject();

    DSAPublicKeySpec keyspec = new DSAPublicKeySpec(Y, P, Q, G);
    PublicKey pkey = kfactory.generatePublic(keyspec);
    System.out.println(pkey);
}

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From source file:MainClass.java

public static KeyPair generateKeyPair(long seed) throws Exception {
    Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
    KeyPairGenerator keyGenerator = KeyPairGenerator.getInstance("DSA");
    SecureRandom rng = SecureRandom.getInstance("SHA1PRNG", "SUN");
    rng.setSeed(seed);
    keyGenerator.initialize(1024, rng);//from   w w w. jav  a2s. c  o  m

    return (keyGenerator.generateKeyPair());
}

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From source file:Main.java

private static byte[] getRawKey(byte[] seed) throws Exception {
    KeyGenerator kgen = KeyGenerator.getInstance("AES");
    SecureRandom sr = SecureRandom.getInstance("SHA1PRNG");
    sr.setSeed(seed);
    kgen.init(128, sr);//from  w ww .j  ava  2 s.  co  m
    SecretKey sKey = kgen.generateKey();
    byte[] raw = sKey.getEncoded();

    return raw;
}

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From source file:Main.java

private static byte[] getRawKey(byte[] seed) throws Exception {
    KeyGenerator kgen = KeyGenerator.getInstance("AES");
    SecureRandom sr = SecureRandom.getInstance("SHA1PRNG", "Crypto");
    sr.setSeed(seed);
    kgen.init(256, sr); // 192 and 256 bits may not be available
    SecretKey skey = kgen.generateKey();
    byte[] raw = skey.getEncoded();
    return raw;//from  w w w.ja va 2 s  .co  m
}

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