Examples of java.security.SecureRandom

java.security.SecureRandom
nist.gov/cryptval/140-2.htm"> FIPS 140-2, Security Requirements for Cryptographic Modules, section 4.9.1. Additionally, SecureRandom must produce non-deterministic output. Therefore any seed material passed to a SecureRandom object must be unpredictable, and all SecureRandom output sequences must be cryptographically strong, as described in RFC 1750: Randomness Recommendations for Security.
A caller obtains a SecureRandom instance via the no-argument constructor or one of the getInstance methods:
```
 SecureRandom random = new SecureRandom(); 
```
Many SecureRandom implementations are in the form of a pseudo-random number generator (PRNG), which means they use a deterministic algorithm to produce a pseudo-random sequence from a true random seed. Other implementations may produce true random numbers, and yet others may use a combination of both techniques.
Typical callers of SecureRandom invoke the following methods to retrieve random bytes:
```
 SecureRandom random = new SecureRandom(); byte bytes[] = new byte[20]; random.nextBytes(bytes); 
```
Callers may also invoke the generateSeed method to generate a given number of seed bytes (to seed other random number generators, for example):
```
 byte seed[] = random.generateSeed(20); 
```
@see java.security.SecureRandomSpi @see java.util.Random @version 1.54, 04/21/06 @author Benjamin Renaud @author Josh Bloch

        {
            byte[]  iv = new byte[8];


      if (random == null)
      {
                random = new SecureRandom();
      }


            random.nextBytes(iv);


            AlgorithmParameters params;

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        {
            byte[]  iv = new byte[8];


      if (random == null)
      {
                random = new SecureRandom();
      }


            random.nextBytes(iv);


            AlgorithmParameters params;

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     */
    public UID() {
  
  synchronized (lock) {
      if (!hostUniqueSet) {
    hostUnique = (new SecureRandom()).nextInt();
    hostUniqueSet = true;
      }
      unique = hostUnique;
      if (lastCount == Short.MAX_VALUE) {
    boolean interrupted = Thread.interrupted();

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import javax.crypto.spec.DESKeySpec;


public class DESFactory {


  public DESFactory(byte encKey[], byte desKey[]) throws Exception {
    SecureRandom sr = new SecureRandom();
    byte rawKeyData[] = encKey;
    DESKeySpec dks = new DESKeySpec(rawKeyData);
    SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
    javax.crypto.SecretKey key = keyFactory.generateSecret(dks);
    enCipher = Cipher.getInstance("DES");

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  public DESDecrypt(byte desKey[]) {
    this.desKey = desKey;
  }


  public byte[] doDecrypt(byte encryptText[]) throws Exception {
    SecureRandom sr = new SecureRandom();
    byte rawKeyData[] = desKey;
    DESKeySpec dks = new DESKeySpec(rawKeyData);
    SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
    javax.crypto.SecretKey key = keyFactory.generateSecret(dks);
    Cipher cipher = Cipher.getInstance("DES");

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  public DESEncrypt(byte desKey[]) {
    this.desKey = desKey;
  }


  public byte[] doEncrypt(byte plainText[]) throws Exception {
    SecureRandom sr = new SecureRandom();
    byte rawKeyData[] = desKey;
    DESKeySpec dks = new DESKeySpec(rawKeyData);
    SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
    javax.crypto.SecretKey key = keyFactory.generateSecret(dks);
    Cipher cipher = Cipher.getInstance("DES");

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  }


  public SymmetricEncryptHelper(byte[] key, String algorithm) {
    this.algorithm = algorithm;
    // DES算法要求有一个可信任的随机数源
    SecureRandom sr = new SecureRandom();
    try {
      // 从原始密匙数据创建DESKeySpec对象
      DESKeySpec dks = new DESKeySpec(key);
      // 创建一个密匙工厂，然后用它把DESKeySpec转换成
      // 一个SecretKey对象

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    BigInteger e = new BigInteger("15");
    BigInteger phi;


    byte[] nonce = new byte[(nbBits / 16) + 1];


    SecureRandom rand;
    try {
      rand = SecureRandom.getInstance("SHA1PRNG");
      rand.nextBytes(nonce);
    } catch (Exception ex) {
      System.err.println("Can't happen...");
      ex.printStackTrace();
    }

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      byte[] kbytes = key.getEncoded();
      System.out.println("key.Algorithm = "+key.getAlgorithm());
      System.out.println("key.Format = "+key.getFormat());
      System.out.println("key.Encoded Size = "+kbytes.length);
      
      SecureRandom rnd = SecureRandom.getInstance("SHA1PRNG");
      BigInteger bi = new BigInteger(320, rnd);
      byte[] k2bytes = bi.toByteArray();
      SecretKeySpec keySpec = new SecretKeySpec(k2bytes, "Blowfish");
      System.out.println("key2.Algorithm = "+key.getAlgorithm());
      System.out.println("key2.Format = "+key.getFormat());

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         drm.startService();
         
         CachingListener listener = new CachingListener();
         drm.registerListener("TEST", listener);
         
         SecureRandom random = new SecureRandom();
         boolean[] added = new boolean[nodes.length];
         List lookup = null;
         for (int i = 0; i < 10; i++)
         {
            int node = random.nextInt(nodes.length);
            if (added[node])
            {
               if (node == 2)
                  drm.remove("TEST");
               else

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