Example usage for java.security SecureRandom SecureRandom

Introduction

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

Prototype

public SecureRandom(byte[] seed) 

Source Link

Document

Constructs a secure random number generator (RNG) implementing the default random number algorithm.

Usage

From source file:Main.java

public static void main(String[] args) {
    SecureRandom secureRandom = new SecureRandom(new byte[] { 1, 3, 3, 7 });
    int[] randoms = IntStream.generate(secureRandom::nextInt).filter(n -> n > 0).limit(10).toArray();
    System.out.println(Arrays.toString(randoms));

    int[] nums = IntStream.iterate(1, n -> n * 2).limit(11).toArray();
    System.out.println(Arrays.toString(nums));
}

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From source file:Main.java

public static void main(String[] args) throws NoSuchAlgorithmException {
    int numBytes = (new Integer("1111")).intValue();

    SecureRandom srand = new SecureRandom(new byte[] { 1, 2, 3, 4 });

    byte[] bytes = new byte[numBytes];
    srand.nextBytes(bytes);/*from  ww w . ja v a2 s  .  c o  m*/
    System.out.println(new String(bytes));
}

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From source file:Main.java

public static void main(String[] args) throws NoSuchAlgorithmException {
    int numBytes = (new Integer("1111")).intValue();

    SecureRandom srand = new SecureRandom(new byte[] { 1, 2, 3, 4 });

    Provider provider = srand.getProvider();
    System.out.println(provider.getName());

    byte[] bytes = new byte[numBytes];
    srand.nextBytes(bytes);//from ww  w .j a va  2s.  c om
    System.out.println(bytes);
}

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From source file:Main.java

public static void main(String[] args) throws NoSuchAlgorithmException {
    int numBytes = (new Integer("1111")).intValue();

    SecureRandom srand = new SecureRandom(new byte[] { 1, 2, 3, 4 });

    Provider provider = srand.getProvider();

    SecureRandom newRandom = SecureRandom.getInstance("SHA1PRNG", provider);

    System.out.println(provider.getName());

    byte[] bytes = new byte[numBytes];
    srand.nextBytes(bytes);//from w w  w . j a v  a 2s.  c  om
    System.out.println(bytes);
}

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From source file:Main.java

private static Key newDesInstance(String strKey) {
    Key key = null;//  www .  j a  v  a2 s  . c om
    try {
        KeyGenerator keyGenerator = KeyGenerator.getInstance("DES");
        keyGenerator.init(new SecureRandom(strKey.getBytes()));
        key = keyGenerator.generateKey();
        keyGenerator = null;
    } catch (Exception e) {
        e.printStackTrace();
    }
    return key;
}

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From source file:Main.java

/**
 * do not work/*from   w w  w .  j a va 2 s  . co  m*/
 */
private static byte[] getRawKey(byte[] seed) throws Exception {
    KeyGenerator keyGenerator = KeyGenerator.getInstance("AES");
    keyGenerator.init(128, new SecureRandom(seed)); // 192 and 256 bits may not be available
    return keyGenerator.generateKey().getEncoded();
}

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From source file:Main.java

public static byte[] aesEncryptToBytes(String content, String encryptKey) throws Exception {
    KeyGenerator kgen = KeyGenerator.getInstance("AES");
    kgen.init(128, new SecureRandom(encryptKey.getBytes()));

    Cipher cipher = Cipher.getInstance("AES");
    cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(kgen.generateKey().getEncoded(), "AES"));

    return cipher.doFinal(content.getBytes("utf-8"));
}

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From source file:Main.java

public static String aesDecryptByBytes(byte[] encryptBytes, String decryptKey) throws Exception {
    KeyGenerator kgen = KeyGenerator.getInstance("AES");
    kgen.init(128, new SecureRandom(decryptKey.getBytes()));

    Cipher cipher = Cipher.getInstance("AES");
    cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(kgen.generateKey().getEncoded(), "AES"));
    byte[] decryptBytes = cipher.doFinal(encryptBytes);

    return new String(decryptBytes);
}

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From source file:Main.java

private static Key getKey(Context mContext) {
    if (key == null) {
        try {//from w ww . jav  a 2s  .co m
            KeyGenerator _generator = KeyGenerator.getInstance("DES");
            _generator.init(new SecureRandom(mContext.getPackageName().getBytes()));
            key = _generator.generateKey();
            _generator = null;
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    return key;
}

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From source file:com.nkapps.billing.services.AuthenticationService.java

public AuthenticationService() {
    random = new SecureRandom((new Date()).toString().getBytes());
}

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