Example usage for java.math BigInteger BigInteger

Introduction

In this page you can find the example usage for java.math BigInteger BigInteger.

Prototype

private BigInteger(byte[] magnitude, int signum)

Source Link

Document

This private constructor is for internal use and assumes that its arguments are correct.

Usage

From source file:com.networknt.utility.HashUtil.java

public static String md5(String input) {

    String md5 = null;/*w  w  w.ja  va  2 s .  c om*/

    if (null == input)
        return null;

    try {

        //Create MessageDigest object for MD5
        MessageDigest digest = MessageDigest.getInstance("MD5");

        //Update input string in message digest
        digest.update(input.getBytes(UTF_8), 0, input.length());

        //Converts message digest value in base 16 (hex)
        md5 = new BigInteger(1, digest.digest()).toString(16);

    } catch (NoSuchAlgorithmException e) {
        throw new RuntimeException(e);
    }
    return md5;
}

From source file:com.hobba.hobaserver.services.security.TokenUtil.java

public String getToken(String kid, String expiration_time) {
    HobaKeysFacadeREST hkfrest = new HobaKeysFacadeREST();
    HobaKeys hk = hkfrest.findHKIDbyKID(kid);
    HobaDevices hd = hk.getIdDevices();/*w w w  .j av a 2  s  .c om*/
    HobaUser hu = hd.getIduser();

    SecureRandom random = new SecureRandom();
    String rand = new BigInteger(256, random).toString(32);
    HobaToken ht = new HobaToken();
    ht.setToken(rand);
    long time = 0;
    try {
        time = Long.parseLong(expiration_time);
        if (time > 0) {
            Date date = new Date(new Date().getTime() + (time * 1000));
            ht.setExpiration(date);
        } else {
            ht.setExpiration(null);
        }
    } catch (Exception e) {
        ht.setExpiration(null);
    }
    ht.setIsValid(Boolean.TRUE);
    ht.setIdUser(hu);

    HobaTokenFacadeREST htfrest = new HobaTokenFacadeREST();
    ht = htfrest.create(ht);
    String token = kid + ":" + rand;
    byte[] encodedBytes = Base64.encodeBase64(token.getBytes());
    token = new String(encodedBytes);
    return token;
}

From source file:org.shareok.data.redis.RedisUtil.java

/**
 *This works by choosing 130 bits from a cryptographically secure random bit generator, and encoding them in base-32. 128 bits is considered to be cryptographically strong, 
 * but each digit in a base 32 number can encode 5 bits, so 128 is rounded up to the next multiple of 5. 
 * This encoding is compact and efficient, with 5 random bits per character. Compare this to a random UUID, 
 * which only has 3.4 bits per character in standard layout, and only 122 random bits in total.
 * /*from ww w.  j  a  v  a  2  s. co  m*/
 * If you allow session identifiers to be easily guessable (too short, flawed random number generator, etc.), 
 * attackers can hijack other's sessions. Note that SecureRandom objects are expensive to initialize, so you'll want to keep one around and reuse it.
 * 
 * @return a secure, random string
 */
public static String getRandomString() {
    SecureRandom random = new SecureRandom();
    return new BigInteger(130, random).toString(32);
}

From source file:com.github.aelstad.keccakj.core.TestPermutation.java

String hexWordsToHexBytes(String hexWords) {
    StringBuilder rv = new StringBuilder();
    byte[] buf = new byte[8];
    for (String word : hexWords.split(" ")) {
        if (word.trim().isEmpty())
            continue;
        long l = new BigInteger(word, 16).longValue();
        for (int i = 0; i < 8; ++i) {
            buf[i] = (byte) ((l >>> (8 * i)) & 0xFF);
        }/*w  w  w  . j  a  va2  s.co  m*/
        rv.append(org.apache.commons.codec.binary.Hex.encodeHex(buf));
    }
    return rv.toString();
}

From source file:tn.insat.controllers.InscriptionController.java

public void handleFileUpload(FileUploadEvent event) {
    InputStream inputStream = null;
    BigInteger random = new BigInteger(64, new Random());
    String path = FacesContext.getCurrentInstance().getExternalContext().getRealPath("/resources/accountPics/");
    System.out.println(path);// www.  j av a 2 s. c  om
    try {
        inputStream = event.getFile().getInputstream();
        FileOutputStream outputStream = new FileOutputStream(
                path + "\\" + random + event.getFile().getFileName());
        byte[] buffer = new byte[4096];
        int bytesRead = 0;
        while (true) {
            bytesRead = inputStream.read(buffer);
            if (bytesRead > 0) {
                outputStream.write(buffer, 0, bytesRead);
            } else {
                break;
            }
        }
        outputStream.close();
        inputStream.close();
        realImagePath = path + "\\" + random + event.getFile().getFileName();
        relativeImagePath = random + event.getFile().getFileName();
        sendMessage(Utilities.getBundleMessage("phr", "success.download"), FacesMessage.SEVERITY_INFO);

    } catch (IOException ex) {
        sendMessage(Utilities.getBundleMessage("err", "error.download"), FacesMessage.SEVERITY_ERROR);
        System.out.println(ex.getMessage());
    }
}

From source file:Main.java

public static byte[] genSirfCommand(String commandHexa) {
    int length = commandHexa.length() / 2;
    ByteBuffer command = ByteBuffer.allocate(length);
    command.put(new BigInteger(commandHexa, 16).toByteArray(), 1, length);
    return command.array();
}

From source file:eu.cloudwave.wp5.feedbackhandler.model.factories.ApplicationFactoryImpl.java

/**
 * {@inheritDoc}/* ww w . ja  v  a 2  s.  com*/
 */
@Override
public DbApplication create(final String applicationId) {
    final String accessToken = new BigInteger(130, new SecureRandom()).toString(32);
    return new DbApplicationImpl(applicationId, accessToken);
}

From source file:Main.java

/**
 *Valid plugin  md5//from  w  ww . ja v  a2 s .co m
 * @param path   bundle archvie path
 * @param md5Sum   target  file md5
 * @return  if md5 matched,return true
 * ***/
public static boolean validFileMD5(String path, String md5Sum) {

    try {
        MessageDigest messageDigest = MessageDigest.getInstance("MD5");
        File mFile = new File(path);
        if (mFile == null || !mFile.exists() || !mFile.isFile()) {
            return false;
        }
        FileInputStream in = new FileInputStream(mFile);
        FileChannel ch = in.getChannel();
        MappedByteBuffer byteBuffer = ch.map(FileChannel.MapMode.READ_ONLY, 0, mFile.length());
        messageDigest.update(byteBuffer);
        String digest = String.format("%032x", new BigInteger(1, messageDigest.digest()));
        return md5Sum.equals(digest.toString());
    } catch (NoSuchAlgorithmException e) {

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

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

    }
    return false;
}

From source file:Main.java

/**
 * Computes the base 16 representation of the byte array argument.
 *
 * @param bytes an array of bytes.//from  ww w.j av a  2 s .c om
 * @return the bytes represented as a string of hexadecimal digits.
 */
public static String toHexString(byte[] bytes) {
    BigInteger bi = new BigInteger(1, bytes);
    return String.format("%0" + (bytes.length << 1) + "X", bi);
}

From source file:com.vangent.hieos.services.xds.bridge.utils.UUIDUtils.java

/**
 * Method description/*from www.ja v  a  2 s .  c o m*/
 *
 *
 * @param uuid
 * @param prefix
 *
 * @return
 */
public static String toOID(UUID uuid, String prefix) {

    String result = null;

    if ((uuid != null) && StringUtils.isNotBlank(prefix)) {

        String uuidstr = uuid.toString().replaceAll("-", "");
        BigInteger bi = new BigInteger(uuidstr, 16);

        result = String.format("%s.%s", prefix, bi.toString());
    }

    return result;
}