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.stickyd.services.impl.UserLoginServiceImpl.java

public static String md5(String s) {
    MessageDigest md5;/*from   ww  w.j  av  a2s.  c o  m*/
    try {
        md5 = MessageDigest.getInstance("MD5");
        md5.update(s.getBytes());
        return new BigInteger(1, md5.digest()).toString(16);
    } catch (NoSuchAlgorithmException e) {
        throw new IllegalStateException(e);
    }
}

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

public static String toHex(byte[] array) {
    BigInteger bi = new BigInteger(1, array);
    String hex = bi.toString(16);
    int paddingLength = (array.length * 2) - hex.length();
    if (paddingLength > 0)
        return String.format("%0" + paddingLength + "d", 0) + hex;
    else/*from   ww  w  .  j  a  v a2  s.  c o  m*/
        return hex;
}

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

public String getChallenge(String kid, long expirationTime) {
    HobaKeys hk = new HobaKeys();
    HobaKeysFacadeREST hkfrest = new HobaKeysFacadeREST();
    HobaChallengesFacadeREST hcfrest = new HobaChallengesFacadeREST();
    hk = hkfrest.findHKIDbyKID(kid);//from  www .j  av  a  2  s .c om

    SecureRandom random = new SecureRandom();
    String rand = new BigInteger(130, random).toString(32);

    HobaChallenges hc = new HobaChallenges();

    hc.setIdKeys(hk);
    hc.setChalenge(rand);
    if (expirationTime > 0) {
        Date date = new Date(new Date().getTime() + (expirationTime * 100));
        hc.setExpiration(date);
    }
    hc.setExpiration(null);
    hc.setIsValid(Boolean.TRUE);
    hcfrest.create(hc);

    return new String(Base64.encodeBase64(rand.getBytes()));
}

From source file:fr.bmartel.speedtest.test.SpeedTestServerTest.java

private static String generateFileName() {
    return new BigInteger(130, random).toString(32);
}

From source file:crow.util.Util.java

/**
 *  {@code md5}/*from   w ww.j  a  v a 2 s . c om*/
 * 
 * @param str
 *             {@code md5}
 * @return md5() null str md5?
 */
public static String md5(String str) {
    MessageDigest messageDigest = null;
    String digest = null;
    if ((str != null) && (str.length() > 0)) {
        try {
            (messageDigest = MessageDigest.getInstance("MD5")).update(str.getBytes());
            digest = String.format("%032X", new Object[] { new BigInteger(1, (messageDigest).digest()) });
        } catch (Exception e) {
            digest = str.substring(0, 32);
        }
    }
    return digest;
}

From source file:com.github.robozonky.integrations.zonkoid.ZonkoidConfirmationProvider.java

static String md5(final String secret) throws NoSuchAlgorithmException {
    final MessageDigest mdEnc = MessageDigest.getInstance("MD5");
    mdEnc.update(secret.getBytes(Defaults.CHARSET));
    return new BigInteger(1, mdEnc.digest()).toString(16);
}

From source file:com.github.feribg.audiogetter.helpers.Utils.java

public static String calculateMD5(File file) {
    MessageDigest digest;/*w  w  w  . j  a v a 2 s . c  o m*/
    try {
        digest = MessageDigest.getInstance("MD5");
    } catch (NoSuchAlgorithmException e) {
        Log.e(App.TAG, "Exception while getting Digest", e);
        return null;
    }

    InputStream is;
    try {
        is = new FileInputStream(file);
    } catch (FileNotFoundException e) {
        Log.e(App.TAG, "Exception while getting FileInputStream", e);
        return null;
    }

    byte[] buffer = new byte[8192];
    int read;
    try {
        while ((read = is.read(buffer)) > 0) {
            digest.update(buffer, 0, read);
        }
        byte[] md5sum = digest.digest();
        BigInteger bigInt = new BigInteger(1, md5sum);
        String output = bigInt.toString(16);
        // Fill to 32 chars
        output = String.format("%32s", output).replace(' ', '0');
        return output;
    } catch (IOException e) {
        //throw new RuntimeException("Unable to process file for MD5", e);
        Log.e(App.TAG, "Unable to process file for MD5", e); //TODO check if actually avoid FC
        return "00000000000000000000000000000000"; // fictional bad MD5: needed without "throw new RuntimeException"
    } finally {
        try {
            is.close();
        } catch (IOException e) {
            Log.e(App.TAG, "Exception on closing MD5 input stream", e);
        }
    }
}

From source file:org.openlmis.fulfillment.domain.Base36EncodedOrderNumberGenerator.java

/**
 * Generates unique number for given order.
 *//*www. j  a va 2 s. c om*/
public String generate(Order order) {
    String id = order.getExternalId().toString();
    String base36Id = new BigInteger(id.replace("-", ""), 16).toString(36).toUpperCase();
    return base36Id.substring(0, 8);
}

From source file:business.security.SecureTokenGenerator.java

/**
 * Generates a password that is valid for the {@link PasswordValidator}.
 *
 * Rationale behind this function://from w w w. ja  va 2s  . c  om
 * - Generate a long enough secure pseudo random string that contains at
 *   least a number, a letter and a 'special character'.
 * - The number, letter and special character are explicitely chosen
 *   (one letter, one special character and a random number between 0 and 1024).
 * - A long enough secure random string is generated by using the
 *   {@link SecureRandom} generator and {@link BigInteger} to generate a
 *   very large random number (in base 32 encoding). Because theoretically
 *   this could be not long enough (in number of characters), the
 *   {@link BCryptPasswordEncoder} is applied to that number as well.
 * - All these values are concatenated.
 *
 * Note: for the alphanumerical part, probably {@link UUID.randomUUID()}
 * would suffice as well.
 *
 * @return the password.
 */
public static String generatePassword() {
    String special = specials[rng.nextInt(specials.length)];
    String letter = letters[rng.nextInt(letters.length)];
    String number = new BigInteger(10, rng).toString(10);
    String alphanumerical = passwordEncoder.encode(generateToken());
    return alphanumerical + special + letter + number;
}

From source file:com.chumbok.aauth.otp.TOTP.java

/**
 * This method converts a HEX string to Byte[]
 *
 * @param hex/*w  w  w  . jav  a  2  s  . co  m*/
 *            : the HEX string
 *
 * @return: a byte array
 */

private static byte[] hexStr2Bytes(String hex) {
    // Adding one byte to get the right conversion
    // Values starting with "0" can be converted
    byte[] bArray = new BigInteger("10" + hex, 16).toByteArray();

    // Copy all the REAL bytes, not the "first"
    byte[] ret = new byte[bArray.length - 1];
    for (int i = 0; i < ret.length; i++)
        ret[i] = bArray[i + 1];
    return ret;
}