Examples of SecureRandom

com.googlecode.gwt.crypto.util.SecureRandom
com.zaranux.client.crypto.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); 
```
Note: Depending on the implementation, the generateSeed and nextBytes methods may block as entropy is being gathered, for example, if they need to read from /dev/random on various unix-like operating systems. @see java.security.SecureRandomSpi @see java.util.Random @author Benjamin Renaud @author Josh Bloch
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

Examples of java.security.SecureRandom

  *
  * @return random string
  */
  private static String generateRandomString() {
    final StringBuffer res = new StringBuffer();
    final Random rnd = new SecureRandom();
    for (int i = 0; i < 32; i++) {
      int pos = (int) (rnd.nextFloat() * CHARS.length());
      res.append(CHARS.charAt(pos));
    }
  
    return res.toString();
  }

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Examples of java.security.SecureRandom

            // create the 20 bytes seed


            byte[] seed = new byte[20];


            KeyGenerator key = KeyGenerator.getInstance("AES");            
            key.init(192, new SecureRandom());
            SecretKey sk = key.generateKey();            
            System.arraycopy(sk.getEncoded(), 0, seed, 0, 20); // create the 20 bytes seed
                
            
            Iterator it = policy.getRecipientsIterator();

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Examples of java.security.SecureRandom

                db.createTable(T_DDL);
                return true;
            }
        });


        final SecureRandom rnd = new SecureRandom();
        final ISqlJetTable t = db.getTable("t");
        final byte[] blob = new byte[1024 + 4096];


        rnd.nextBytes(blob);


        db.runWriteTransaction(new ISqlJetTransaction() {
            public Object run(SqlJetDb db) throws SqlJetException {


                try {
                    t.insert(rnd.nextInt(2048), blob);
                } catch (SqlJetException e) {
                    if (!SqlJetErrorCode.CONSTRAINT.equals(e.getErrorCode())) {
                        throw e;
                    }
                }

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