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()

Source Link

Document

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

Usage

From source file:Main.java

/**
 * Generates a random token./*from w  w w. j  a  v a 2s  . co  m*/
 *
 * @return A nonce, with a length of 32, to be used with the {@link SafetyNet} request.
 */
public static byte[] generateOneTimeNonce() {
    if (secureRandom == null) {
        secureRandom = new SecureRandom();
    }
    byte[] nonce = new byte[32];
    secureRandom.nextBytes(nonce);
    return nonce;
}

From source file:com.lingxiang2014.util.RSAUtils.java

public static KeyPair generateKeyPair() {
    try {//from   w ww. j  a v a 2  s  .  c  o  m
        KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA", PROVIDER);
        keyPairGenerator.initialize(KEY_SIZE, new SecureRandom());
        return keyPairGenerator.generateKeyPair();
    } catch (NoSuchAlgorithmException e) {
        e.printStackTrace();
        return null;
    }
}

From source file:Main.java

public static BigInteger createPrimeBigger(BigInteger valueThatDeterminesNumberOfBits) {
    Random random = new SecureRandom();
    return createPrimeBigger(valueThatDeterminesNumberOfBits, random);
}

From source file:com.gmu.uav.RadioSecurity.java

public static String computeSHA256(String password) {
    MessageDigest messagDigest = null;
    String saltedPassword = null;

    SecureRandom random = new SecureRandom();
    byte[] salt = new byte[SALT_BYTES];
    random.nextBytes(salt);/*from ww w.j a  v a  2  s.  com*/

    saltedPassword = salt + password;

    try {

        messagDigest = MessageDigest.getInstance("SHA-256");

    } catch (NoSuchAlgorithmException e) {

        e.printStackTrace();
    }

    messagDigest.update(saltedPassword.getBytes());

    byte finalHash[] = messagDigest.digest();

    return HASH_ITERATIONS + ":" + toHex(salt) + ":" + toHex(finalHash);
}

From source file:Main.java

public static BigInteger createPrimeBigger(BigInteger valueThatDeterminesNumberOfBits) {
    int numbits = valueThatDeterminesNumberOfBits.bitLength() + 1;
    Random random = new SecureRandom();
    BigInteger ret = BigInteger.probablePrime(numbits, random);
    return ret;/*from   www .j ava2  s .c om*/
}

From source file:Main.java

public static byte[] DESTemplet(byte[] data, byte[] key, String algorithm, String transformation,
        boolean isEncrypt) {
    try {/*from   w ww.  j a va2s.  c o  m*/
        SecretKeySpec keySpec = new SecretKeySpec(key, algorithm);
        Cipher cipher = Cipher.getInstance(transformation);
        SecureRandom random = new SecureRandom();
        cipher.init(isEncrypt ? Cipher.ENCRYPT_MODE : Cipher.DECRYPT_MODE, keySpec, random);
        return cipher.doFinal(data);
    } catch (Throwable e) {
        e.printStackTrace();
    }
    return null;
}

From source file:Main.java

static KeyPair generateRsaKeyPair(int keySizeInBits) {
    if (keySizeInBits == 0 || keySizeInBits % 8 != 0)
        return null;
    try {/*from  ww w .  j  av a 2 s .  c om*/
        KeyPairGenerator generator = KeyPairGenerator.getInstance("RSA", "SC");
        generator.initialize(keySizeInBits, new SecureRandom());

        KeyPair pair = generator.generateKeyPair();

        // Log.d("","public : "+keyToBase64(pair.getPublic()));
        // Log.d("","private: "+keyToBase64(pair.getPrivate()));

        return pair;
    } catch (Exception e) {
        e.printStackTrace();
    }
    return null;
}

From source file:Main.java

public static byte[] desTemplate(byte[] data, byte[] key, String algorithm, String transformation,
        boolean isEncrypt) {
    if (data == null || data.length == 0 || key == null || key.length == 0)
        return null;
    try {//from w w w.  j a v  a2s.co  m
        SecretKeySpec keySpec = new SecretKeySpec(key, algorithm);
        Cipher cipher = Cipher.getInstance(transformation);
        SecureRandom random = new SecureRandom();
        cipher.init(isEncrypt ? Cipher.ENCRYPT_MODE : Cipher.DECRYPT_MODE, keySpec, random);
        return cipher.doFinal(data);
    } catch (Throwable e) {
        e.printStackTrace();
        return null;
    }
}

From source file:Main.java

public static String getJwkPublic(KeyPair kp) {
    try {/*from ww w .  j a va  2 s  .  c o m*/
        JSONObject jk = new JSONObject();
        jk.put("kty", "RSA");
        // generate random kid 
        SecureRandom random = new SecureRandom();
        String kid = new BigInteger(130, random).toString(32);
        jk.put("kid", kid);
        jk.put("e", "AQAB");

        KeyFactory kfactory = KeyFactory.getInstance("RSA");

        RSAPublicKeySpec kspec = (RSAPublicKeySpec) kfactory.getKeySpec(kp.getPublic(), RSAPublicKeySpec.class);

        jk.put("n", encodeB64(kspec.getModulus().toByteArray()));
        JSONArray ja = new JSONArray();
        ja.put(jk);
        JSONObject jo = new JSONObject();
        jo.put("keys", ja);

        // Log.d("getJwkPublic key: ",pubkey.toString());
        // Log.d("getJwkPublic jwk: ",jo.toString());

        return jo.toString();

    } catch (Exception e) {
        e.printStackTrace();
    }

    return null;
}

From source file:Main.java

public static String getJwkPrivate(KeyPair kp) {
    try {//from   w w  w  .j a v  a 2  s. c  om
        JSONObject jk = new JSONObject();
        jk.put("kty", "RSA");
        // generate random kid 
        SecureRandom random = new SecureRandom();
        String kid = new BigInteger(130, random).toString(32);
        jk.put("kid", kid);
        jk.put("e", "AQAB");

        KeyFactory kfactory = KeyFactory.getInstance("RSA");

        RSAPrivateKeySpec privkspec = (RSAPrivateKeySpec) kfactory.getKeySpec(kp.getPrivate(),
                RSAPrivateKeySpec.class);
        RSAPublicKeySpec pubkspec = (RSAPublicKeySpec) kfactory.getKeySpec(kp.getPublic(),
                RSAPublicKeySpec.class);

        // Log.d("getJwkPrivate n",pubkspec.getPublicExponent().toString());
        // Log.d("getJwkPrivate d",privkspec.getPrivateExponent().toString());

        jk.put("n", encodeB64(pubkspec.getModulus().toByteArray()));
        jk.put("d", encodeB64(privkspec.getPrivateExponent().toByteArray()));
        JSONArray ja = new JSONArray();
        ja.put(jk);
        JSONObject jo = new JSONObject();
        jo.put("keys", ja);

        return jo.toString();

    } catch (Exception e) {
        e.printStackTrace();
    }
    return null;
}