Example usage for java.security SecureRandom nextBytes

Introduction

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

Prototype

@Override
public void nextBytes(byte[] bytes)

Source Link

Document

Generates a user-specified number of random bytes.

Usage

From source file:org.sonar.server.usertoken.TokenGeneratorImpl.java

@Override
public String generate() {
    SecureRandom random = new SecureRandom();
    byte[] bytes = new byte[20];
    random.nextBytes(bytes);
    return Hex.encodeHexString(bytes);
}

From source file:se.sawano.java.security.otp.DefaultRandomSupplier.java

private SecureRandom createRandom() {
    counter = 0;/* ww  w .  j a  va 2  s  .c  om*/
    final SecureRandom secureRandom = new SecureRandom();
    secureRandom.nextBytes(new byte[1]); // Ensure seeding
    return secureRandom;
}

From source file:gov.nih.nci.cagrid.opensaml.provider.SecureRandomIDProvider.java

/**
 * @see gov.nih.nci.cagrid.opensaml.SAMLIdentifier#generateRandomBytes(java.security.SecureRandom, int)
 *///from  ww  w.j  a  va  2s . c  o  m
public byte[] generateRandomBytes(SecureRandom random, int n) {
    byte[] bytes = new byte[n];
    random.nextBytes(bytes);
    return bytes;
}

From source file:com.erudika.para.utils.Utils.java

/**
 * Generates an authentication token - a random string encoded in Base64.
 * @param length the length of the generated token
 * @param urlSafe switches to a URL safe encoding
 * @return a random string//from  w  w  w  . j  a  va 2s .c o  m
 */
public static String generateSecurityToken(int length, boolean urlSafe) {
    final byte[] bytes = new byte[length];
    SecureRandom rand;
    try {
        rand = SecureRandom.getInstance("SHA1PRNG");
    } catch (NoSuchAlgorithmException ex) {
        logger.error(null, ex);
        rand = new SecureRandom();
    }
    rand.nextBytes(bytes);
    return urlSafe ? base64encURL(bytes) : base64enc(bytes);
}

From source file:adminpassword.Encryption.java

public String encrypt(String word, String idKey) throws Exception {

    byte[] ivBytes;
    String password = idKey; //you can give whatever you want. This is for testing purpose
    SecureRandom random = new SecureRandom();
    byte bytes[] = new byte[20];
    random.nextBytes(bytes);

    byte[] saltBytes = bytes;

    // Derive the key
    SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");
    PBEKeySpec spec = new PBEKeySpec(password.toCharArray(), saltBytes, 65556, 256);
    SecretKey secretKey = factory.generateSecret(spec);
    SecretKeySpec secret = new SecretKeySpec(secretKey.getEncoded(), "AES");

    //encrypting the word
    Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
    cipher.init(Cipher.ENCRYPT_MODE, secret);
    AlgorithmParameters params = cipher.getParameters();
    ivBytes = params.getParameterSpec(IvParameterSpec.class).getIV();
    byte[] encryptedTextBytes = cipher.doFinal(word.getBytes("UTF-8"));

    //prepend salt and vi
    byte[] buffer = new byte[saltBytes.length + ivBytes.length + encryptedTextBytes.length];
    System.arraycopy(saltBytes, 0, buffer, 0, saltBytes.length);
    System.arraycopy(ivBytes, 0, buffer, saltBytes.length, ivBytes.length);
    System.arraycopy(encryptedTextBytes, 0, buffer, saltBytes.length + ivBytes.length,
            encryptedTextBytes.length);//from   w w w  . j  a  v a 2  s  . c  o  m
    return new Base64().encodeToString(buffer);
}

From source file:com.blackcrowsys.sinscrypto.AesKeyGenerator.java

@Override
public String generateIV() {
    SecureRandom random = new SecureRandom();
    byte[] bytes = new byte[IVSIZE];
    random.nextBytes(bytes);
    return Hex.encodeHexString(bytes);
}

From source file:com.blackcrowsys.sinscrypto.AesKeyGenerator.java

@Override
public String generateSalt() {
    SecureRandom random = new SecureRandom();
    byte[] bytes = new byte[SALTSIZE];
    random.nextBytes(bytes);
    return Hex.encodeHexString(bytes);
}

From source file:nl.waisda.services.UserService.java

public ResetPassword requestPasswordReset(User user) {
    SecureRandom random = new SecureRandom();
    byte bytes[] = new byte[64];
    random.nextBytes(bytes);

    String plainTextKey = Base64.encodeBase64String(bytes);
    plainTextKey = plainTextKey.replaceAll("[^a-zA-Z0-9]", "");
    ResetPassword reset = new ResetPassword(user, plainTextKey);
    rpwRepo.store(reset);//  www .  j  a v  a  2s .  c om

    return reset;
}

From source file:adminpassword.AESDemo.java

public String generateSalt() {
    SecureRandom random = new SecureRandom();
    byte bytes[] = new byte[20];
    random.nextBytes(bytes);
    String s = new String(bytes);
    return s;/*  w  w w  .  ja v  a 2  s  .  c  o  m*/
}

From source file:com.andiandy.m101j.week2.hw3.SessionDAO.java

public String startSession(String username) {

    // get 32 byte random number. that's a lot of bits.
    SecureRandom generator = new SecureRandom();
    byte randomBytes[] = new byte[32];
    generator.nextBytes(randomBytes);

    String sessionID = Base64.encodeBase64(randomBytes).toString();

    // build the BSON object
    BasicDBObject session = new BasicDBObject("username", username);

    session.append("_id", sessionID);

    sessionsCollection.insert(session);//  ww w. j ava 2s . co m

    return session.getString("_id");
}