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

      sslContext = SSLContext.getInstance("SSLv3");
      if (trustManager == null) {
        trustManager = new TrustManager[]{DummyTrustManager.getInstance()};
      }


      sslContext.init(new KeyManager[0], trustManager, new SecureRandom());
    }


    if (getSslSocketFactory() == null) {
      sslSocketFactory = sslContext.getSocketFactory();
    }

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        km = kmf.getKeyManagers();
      } else {
        km = new KeyManager[0];
      }


      context.init(km, getTrustManager(), new SecureRandom());
      setSslContext(context);
    }
    
    if(getSslSocketFactory()==null) {
      SSLSocketFactory factory = getSslContext().getSocketFactory();

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            this.random = rParam.getRandom();
            kParam = (AsymmetricKeyParameter)rParam.getParameters();
        }
        else
        {   
            this.random = new SecureRandom();
            kParam = (AsymmetricKeyParameter)param;
        }


        engine.init(forEncryption, kParam);

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                this.random = rParam.getRandom();
                this.key = (ECPrivateKeyParameters)rParam.getParameters();
            }
            else
            {
                this.random = new SecureRandom();
                this.key = (ECPrivateKeyParameters)param;
            }
        }
        else
        {

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      {
        pGen.init(strength, 20, random);
      }
      else
      {
        pGen.init(strength, 20, new SecureRandom());
      }


            DHParameters                p = pGen.generateParameters();


            AlgorithmParameters params;

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      {
        pGen.init(strength, 20, random);
      }
      else
      {
        pGen.init(strength, 20, new SecureRandom());
      }


            DSAParameters p = pGen.generateParameters();


            AlgorithmParameters params;

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      {
        pGen.init(strength, 20, random);
      }
      else
      {
        pGen.init(strength, 20, new SecureRandom());
      }


            ElGamalParameters p = pGen.generateParameters();


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


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


                random.nextBytes(iv);


                try

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        {
            byte[]  iv = new byte[16];


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


            random.nextBytes(iv);


            AlgorithmParameters params;

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