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

        return retval;
    }




    protected static byte[] generateRandomBytes() {
        SecureRandom ng=numberGenerator;
        if(ng == null)
            numberGenerator=ng=new SecureRandom();


        byte[] randomBytes=new byte[16];
        ng.nextBytes(randomBytes);
        return randomBytes;
    }

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    TrustManagerFactory tmf = TrustManagerFactory.getInstance("SunX509");
    tmf.init(keystore);       
    TrustManager[] trustManagers = tmf.getTrustManagers();
    
    SSLContext ctx = SSLContext.getInstance(sslContext);
    SecureRandom securerandom = SecureRandom.getInstance("SHA1PRNG");
//    SecureRandom securerandom = null;
    ctx.init(kmf.getKeyManagers(),trustManagers,securerandom);
    
    return ctx.getSocketFactory();
  }

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     * The {@code UUID} is generated using a cryptographically strong pseudo
     * random number generator.
     * @return  A randomly generated {@code UUID}
     */
    public static UUID randomUUID() {
        SecureRandom ng=numberGenerator;
        if(ng == null)
            numberGenerator=ng=new SecureRandom();


        byte[] randomBytes=new byte[16];
        ng.nextBytes(randomBytes);
        return new UUID(randomBytes);
    }

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        TrustManagerFactory trustManagerFactory=TrustManagerFactory.getInstance(_sslTrustManagerFactoryAlgorithm);
        trustManagerFactory.init(trustStore);
        trustManagers=trustManagerFactory.getTrustManagers();


        SecureRandom secureRandom=_secureRandomAlgorithm==null?null:SecureRandom.getInstance(_secureRandomAlgorithm);
        SSLContext context=_provider==null?SSLContext.getInstance(_protocol):SSLContext.getInstance(_protocol,_provider);
        context.init(keyManagers,trustManagers,secureRandom);
        return context;
    }

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    // TIPS: By adding option '-Djava.security.egd=file:/dev/./urandom'
    //       SHA1PRNG will be used instead of NativePRNG.
    // On MacOSX, 'new SecureRandom()' will use NativePRNG algorithm and
    // it is also slower than SHA1PRNG.
    // On Windows, 'new SecureRandom()' will use SHA1PRNG algorithm.
    random=new SecureRandom();


    /*
    try{ 
      random=SecureRandom.getInstance("SHA1PRNG"); 
      return;

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    TrustManagerFactory tmf = TrustManagerFactory.getInstance("SunX509");
    tmf.init(keystore);       
    TrustManager[] trustManagers = tmf.getTrustManagers();


    SSLContext ctx = SSLContext.getInstance(sslContext);
    SecureRandom securerandom = SecureRandom.getInstance("SHA1PRNG");
    //    SecureRandom securerandom = null;
    ctx.init(kmf.getKeyManagers(),trustManagers,securerandom);


    return ctx.getServerSocketFactory();
  }

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    public void setPayload(String payload) {
        this.payload=payload;
    }


    protected static byte[] generateRandomBytes() {
        SecureRandom ng=numberGenerator;
        if(ng == null)
            numberGenerator=ng=new SecureRandom();


        byte[] randomBytes=new byte[16];
        ng.nextBytes(randomBytes);
        return randomBytes;
    }

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        return super.toString() + "(" + printDetails() + ")";
    }


    
    protected static byte[] generateRandomBytes() {
        SecureRandom ng=numberGenerator;
        if(ng == null)
            numberGenerator=ng=new SecureRandom();


        byte[] randomBytes=new byte[16];
        ng.nextBytes(randomBytes);
        return randomBytes;
    }

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    keepAliveHdrParams = "timeout=" + timeoutKeepAliveSec + ", max="
        + maxAliveConnUse;


    expiredIn = arguments.get(ARG_SESSION_TIMEOUT) != null ? ((Integer) arguments
        .get(ARG_SESSION_TIMEOUT)).intValue() : DEF_SESSION_TIMEOUT;
    srandom = new SecureRandom(
        (arguments.get(ARG_SESSION_SEED) == null ? "TJWS" + new Date()
            : (String) arguments.get(ARG_SESSION_SEED)).getBytes());
    try {
      gzipInStreamConstr = Class.forName("java.util.zip.GZIPInputStream")
          .getConstructor(new Class[] { InputStream.class });

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   * @throws Exception
   */
  public static byte[] encrypt(byte[] src, byte[] key)
    throws Exception {
    //    DES�㷨Ҫ����һ�������ε������Դ
    SecureRandom sr = new SecureRandom();
    // ��ԭʼ�ܳ����ݴ���DESKeySpec����
    DESKeySpec dks = new DESKeySpec(key);
    // ����һ���ܳ׹�����Ȼ��������DESKeySpecת����
    // һ��SecretKey����
    SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);

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