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

            kmf.init(ks, certificatePassword);


            // Initialize the SSLContext to work with our key managers.
            KeyManager[] keyManagers = kmf.getKeyManagers();
            TrustManager[] trustManagers = new TrustManager[]{DUMMY_TRUST_MANAGER};
            SecureRandom secureRandom = new SecureRandom();


            SSLContext sslContext = SSLContext.getInstance("TLS");
            sslContext.init(keyManagers, trustManagers, secureRandom);
            return sslContext;
        } catch (Exception e) {

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     {
         PreparedStatement ps = null;
         try {
             if (login!=null&&password!=null&&login.length()<=100){
                 // Uses a secure Random not a simple Random
                 SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
                 // Salt generation 64 bits long
                 byte[] bSalt = new byte[8];
                 random.nextBytes(bSalt);
                 // Digest computation
                 byte[] bDigest = getHash(ITERATION_NUMBER,password,bSalt);
                 String sDigest = byteToBase64(bDigest);
                 String sSalt = byteToBase64(bSalt);

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    } catch (IOException exc) {
      //ignore the failure, we're just trying to come up with a random seed
    }
    byte[] rand = byteOut.toByteArray();


    SecureRandom randomizer = new SecureRandom(rand);
    randomizer.nextBytes(address);


    // set the MSB of the first octet to 1 to distinguish from IEEE node addresses
    address[0] = (byte) (address[0] | (byte) 0x80);


    return address;

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        http.addNode("localhost.80", "sling:Mapping");
        Node https = map.addNode("https", "sling:Mapping");
        https.addNode("localhost.443", "sling:Mapping");


        // define a vanity path for the rootPath
        SecureRandom random = new SecureRandom();
        // creating <nodeCount> nodes
        for (int j = 0; j < nodeCount; j++) {
            Node content = rootNode.addNode("a" + j, JcrConstants.NT_UNSTRUCTURED);
            String alias = new BigInteger(130, random).toString(32);
            content.setProperty(PN_SLING_ALIAS, alias);

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        Node http = map.addNode("http", "sling:Mapping");
        http.addNode("localhost.80", "sling:Mapping");
        Node https = map.addNode("https", "sling:Mapping");
        https.addNode("localhost.443", "sling:Mapping");


        SecureRandom random = new SecureRandom();


        // creating <nodeCount> x <childNodeCount> nodes with vanity
        for (int j = 0; j < nodeCount; j++) {
            Node content = rootNode.addNode("a" + j, JcrConstants.NT_UNSTRUCTURED);
            String s = new BigInteger(130, random).toString(32);

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        Node aliasNode = map.addNode("alias", "nt:unstructured");
        Node localhost80 =http.addNode("localhost.80", "sling:Mapping");
        Node https = map.addNode("https", "sling:Mapping");
        https.addNode("localhost.443", "sling:Mapping");


        SecureRandom random = new SecureRandom();


        for (int j = 0; j < nodeCount; j++) {
            Node content = rootNode.addNode("a" + j, JcrConstants.NT_UNSTRUCTURED);
            String alias = new BigInteger(130, random).toString(32);
            content.setProperty(PN_SLING_ALIAS, alias);

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        Node aliasNode = map.addNode("alias", "nt:unstructured");
        Node localhost80 =http.addNode("localhost.80", "sling:Mapping");
        Node https = map.addNode("https", "sling:Mapping");
        https.addNode("localhost.443", "sling:Mapping");


        SecureRandom random = new SecureRandom();


        // creating <nodeCount> x <childNodeCount> nodes with vanity
        for (int j = 0; j < nodeCount; j++) {
            Node content = rootNode.addNode("a" + j, JcrConstants.NT_UNSTRUCTURED);
            String s = new BigInteger(130, random).toString(32);

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      HostnameVerifier hv = new HostnameVerifier() {
        public boolean verify(String arg0, SSLSession arg1) {
          return true;
        }
      };
      sc.init(null, trustAllCerts, new SecureRandom());


      if(protocol != null) {
        factory = new DisabledProtocolsSocketFactory(sc.getSocketFactory(), protocol);
      } else {
        factory = sc.getSocketFactory();

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   * hashing to apply - the work factor therefore increases as
   * 2**log_rounds.
   * @return  an encoded salt value
   */
  public static String gensalt(int log_rounds) {
    return gensalt(log_rounds, new SecureRandom());
  }

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    extends CipherProvider.Encryptor.Builder<AESCTRNoPaddingEncryptor> {
    @Override
    public AESCTRNoPaddingEncryptor build() {
      ByteBuffer buffer = ByteBuffer.allocate(16);
      byte[] seed = new byte[12];
      SecureRandom random = new SecureRandom();
      random.nextBytes(seed);
      buffer.put(seed).putInt(1);
      return new AESCTRNoPaddingEncryptor(key, buffer.array());
    }

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