Example usage for java.security SecureRandom getInstance

Introduction

In this page you can find the example usage for java.security SecureRandom getInstance.

Prototype

public static SecureRandom getInstance(String algorithm) throws NoSuchAlgorithmException 

Source Link

Document

Returns a SecureRandom object that implements the specified Random Number Generator (RNG) algorithm.

Usage

From source file:com.clustercontrol.util.KeyCheck.java

/**
 * ????????//from w  w  w . j a  va2s  .  c o  m
 * 
 * @param args
 */
public static void main(String[] args) {
    PrivateKey privateKey = null;
    PublicKey publicKey = null;

    /// ??????? true
    /// ???????? false (?)
    boolean flag = false;
    if (flag) {
        try {
            // ?
            privateKey = getPrivateKey(
                    "???????privateKey.txt??");

            // ?
            publicKey = getPublicKey("???????");
            // publicKey = getPublicKey(publicKeyStr);
        } catch (Exception e) {
            System.out.println("hoge" + e.getMessage());
        }
    } else {
        KeyPairGenerator generator;
        try {
            generator = KeyPairGenerator.getInstance(ALGORITHM);
            SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
            // ?? 1024
            generator.initialize(1024, random);
            KeyPair keyPair = generator.generateKeyPair();
            privateKey = keyPair.getPrivate();
            publicKey = keyPair.getPublic();
        } catch (NoSuchAlgorithmException ex) {
            System.out.println(ex.getMessage());
        }
    }

    //
    // ?
    System.out.println("?");
    System.out.println(byte2String(privateKey.getEncoded()));
    System.out.println("?");
    System.out.println(byte2String(publicKey.getEncoded()));

    // ???????
    String string = "20140701_nttdata";
    byte[] src = string.getBytes();
    System.out.println("??String");
    System.out.println(string);
    System.out.println("??byte");
    System.out.println(byte2String(src));

    // ?
    try {
        String encStr = encrypt(string, privateKey);
        System.out.println("?");
        System.out.println(encStr);

        // ?
        String decStr = decrypt(encStr, publicKey);
        System.out.println("?");
        System.out.println(decStr);
    } catch (Exception e) {
        System.out.println(e.getMessage());
    }

}

---

From source file:org.scantegrity.scanner.Scanner.java

/**
 * Main Logic loop.//ww  w  .  j av  a  2 s. co m
 * 
 * @param args CLI flags
 */
public static void main(String[] args) {
    processCmdLine(args);

    //Create the locations we should output files too
    createOutputDirectories();

    //register logging handlers if any
    c_myId = c_config.getPollID();
    c_log = new Logging(c_outDirs, c_myId, Level.FINEST);
    c_log.log(Level.INFO, "Logging Intialized");
    c_log.log(Level.INFO, "Scanner ID Number: " + c_myId);

    c_log.log(Level.INFO, "Initializing Cryptographic hash and rng.");
    try {
        c_hash = MessageDigest.getInstance("SHA1");
    } catch (NoSuchAlgorithmException l_e) {
        l_e.printStackTrace();
        c_hash = null;
        c_log.log(Level.SEVERE, "Unable to initialize hash. Reason: " + l_e.getMessage());
    }
    try {
        c_csprng = SecureRandom.getInstance("SHA1PRNG");
    } catch (NoSuchAlgorithmException l_e) {
        l_e.printStackTrace();
        c_csprng = null;
        c_log.log(Level.SEVERE, "Unable to initialize RNG. Reason: " + l_e.getMessage());
    }

    //init counters
    c_scanCount = new Integer(0);
    c_ballotCount = new Integer(0);
    c_errorCount = new Integer(0);
    checkForPreviousCounters();
    writeCounters();

    //init ballot storage
    c_ballotIds = new Vector<Integer>();
    //TODO: Change this size to be variable...
    c_store = initializeBallotStore(c_outDirs, 100 * 1024 * 1024);

    //start the election
    c_log.log(Level.SEVERE, "Election Started");

    playAudioClip(2);

    //main loop
    //TODO: terminating condition, button, or special ballot???
    while (true) {
        BufferedImage l_ballotImg[] = null;
        Ballot l_ballot = null;

        //process image into ballot
        l_ballotImg = getBallotImages();

        if (l_ballotImg == null || (l_ballotImg[0] == null && l_ballotImg[1] == null))
            continue;

        //scan count
        c_scanCount++;
        writeCounters();

        playAudioClip(0);

        for (int l_c = 0; l_c < l_ballotImg.length; l_c++) {
            //Ignore empties
            if (l_ballotImg[l_c] == null) {
                c_log.log(Level.WARNING,
                        "Only 1 ballot object returned." + " Make sure the scanner supports duplex");
                continue;
            }
            //Ignore blank pages
            if (DrunkDriver.isDrunk(l_ballotImg[l_c], 10))
                continue;

            l_ballot = getBallot(l_ballotImg[l_c]);

            if (l_ballot == null)
                continue;

            //update ballot counter
            c_ballotCount++;
            writeCounters();

            l_ballot.setScannerId(c_myId);

            if (isDuplicate(l_ballot)) {
                c_log.log(Level.WARNING, "Duplicate Ballot detected. ID : " + l_ballot.getId());
                l_ballot.setCounted(false);
                l_ballot.addNote("Duplicate Ballot");
            }

            //check if the ballot is a "starting ballot"

            //check if the ballot is a "closing ballot"

            //else
            saveBallot(l_ballot);
        }
        //resume scanning
    }

    //end election (ballot handler)

    //turn off storage

    //disconnect devices 

    //turn off log 

    //quit
    //endElection(); 
}

---

From source file:Main.java

private static byte[] randomBytes(int length) throws Exception {
    SecureRandom random = SecureRandom.getInstance(RANDOM_ALGORITHM);
    byte[] b = new byte[length];
    random.nextBytes(b);/*www  . j  a  v a2s  . co  m*/
    return b;
}

---

From source file:Main.java

private static byte[] getRawKey(byte[] seed) throws Exception {
    KeyGenerator kgen = KeyGenerator.getInstance("AES");
    SecureRandom sr = SecureRandom.getInstance("SHA1PRNG");
    sr.setSeed(seed);/* ww  w  . java2  s  .c  o m*/
    kgen.init(128, sr);
    SecretKey sKey = kgen.generateKey();
    byte[] raw = sKey.getEncoded();

    return raw;
}

---

From source file:Main.java

public static String generateNonce() {
    try {/*from   ww  w .j  av a 2 s .  c  o  m*/
        // Create a secure random number generator
        SecureRandom sr = SecureRandom.getInstance("SHA1PRNG");

        // Get 1024 random bits
        byte[] bytes = new byte[1024 / 8];
        sr.nextBytes(bytes);

        // Create two secure number generators with the same seed
        int seedByteCount = 10;
        byte[] seed = sr.generateSeed(seedByteCount);

        sr = SecureRandom.getInstance("SHA1PRNG");
        sr.setSeed(seed);
        SecureRandom sr2 = SecureRandom.getInstance("SHA1PRNG");
        sr2.setSeed(seed);

        String nonce = Long.toHexString(sr2.nextLong());
        nonce = nonce.substring(0, 7);

        return nonce;

    } catch (NoSuchAlgorithmException e) {
    }
    return null;
}

---

From source file:Main.java

public static byte[] getRandomKey(byte[] seed) throws Exception {

    KeyGenerator kg = KeyGenerator.getInstance(KEY_ALGORITHM);
    SecureRandom sr = SecureRandom.getInstance("SHA1PRNG"); //random
    sr.setSeed(seed);/*  w w  w. j a va  2 s . c om*/
    kg.init(128, sr);
    SecretKey secretKey = kg.generateKey();
    return secretKey.getEncoded();
}

---

From source file:Main.java

public static KeyPair generateKeyPair(int keySize) throws NoSuchAlgorithmException, NoSuchProviderException {
    KeyPairGenerator generator = KeyPairGenerator.getInstance(KEYGEN_ALGORITHM/* , PROVIDER_NAME */);
    SecureRandom secureRandom = SecureRandom.getInstance(SECURE_RANDOM_ALGORITHM/* , PROVIDER_NAME */);
    generator.initialize(keySize, secureRandom);
    return generator.generateKeyPair();
}

---

From source file:Main.java

public static SecureRandom getSecureRandom() {
    try {/*w  ww . j  a v  a2  s  .  c  o m*/
        return SecureRandom.getInstance("SHA1PRNG");
    } catch (NoSuchAlgorithmException e) {
        throw new AssertionError(e);
    }
}

---

From source file:Main.java

private static byte[] generateSalt() throws NoSuchAlgorithmException {
    SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
    byte[] salt = new byte[8];
    random.nextBytes(salt);/*from  w w  w .ja  va 2 s . c  om*/

    return salt;
}

---

From source file:Main.java

private static byte[] generateSalt() throws NoSuchAlgorithmException {
    SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
    byte[] salt = new byte[16];
    random.nextBytes(salt);// ww w  .  ja v  a 2  s .  c  om

    return salt;
}

---

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