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.apexxs.neonblack.utilities.MD5Utilities.java

public static String getMD5Hash(String s) {
    String md5Hash = StringUtils.EMPTY;
    try {//from   w ww .  jav  a  2  s .c o m
        MessageDigest md = MessageDigest.getInstance("MD5");
        md.reset();
        byte[] bytes = md.digest(s.getBytes("UTF-8"));
        md5Hash = String.format("%032x", new BigInteger(1, bytes));
    } catch (Exception ex) {
        logger.error("Error generating MD5 hash from " + s + "\n" + ex.getMessage());
    }
    return md5Hash;
}

From source file:com.odap.server.audit.ConfigHandler.java

private static String nextSessionId() {
    return new BigInteger(130, random).toString(16);
}

From source file:AppPackage.Session.java

public String generateToken() {
    return new BigInteger(130, random).toString(32);
}

From source file:Main.java

private static boolean passesMillerRabin(BigInteger us, int iterations, Random rnd) {
    final BigInteger ONE = BigInteger.ONE;
    final BigInteger TWO = BigInteger.valueOf(2);
    // Find a and m such that m is odd and this == 1 + 2**a * m
    BigInteger thisMinusOne = us.subtract(ONE);
    BigInteger m = thisMinusOne;//  w w  w  .  j  a  v a2 s  .co  m
    int a = m.getLowestSetBit();
    m = m.shiftRight(a);

    // Do the tests
    if (rnd == null) {
        rnd = new SecureRandom();
    }
    for (int i = 0; i < iterations; i++) {
        // Generate a uniform random on (1, this)
        BigInteger b;
        do {
            b = new BigInteger(us.bitLength(), rnd);
        } while (b.compareTo(ONE) <= 0 || b.compareTo(us) >= 0);

        int j = 0;
        BigInteger z = b.modPow(m, us);
        while (!((j == 0 && z.equals(ONE)) || z.equals(thisMinusOne))) {
            if (j > 0 && z.equals(ONE) || ++j == a)
                return false;
            z = z.modPow(TWO, us);
        }
    }
    return true;
}

From source file:com.honnix.yaacs.util.MD5.java

/**
 * Get MD5 sum of the input data.// ww  w .j  a  v a2  s. com
 * 
 * @param data
 *            input data used to generate MD5 sum
 * @return MD5 sum of the input data, or null if no MD5 algorithm could be
 *         found
 */
public static String getMD5Sum(String data) {
    String encodedData = null;

    try {
        MessageDigest messageDigest = MessageDigest.getInstance("MD5");

        messageDigest.update(data.getBytes("US-ASCII"), 0, data.length());
        encodedData = new BigInteger(1, messageDigest.digest()).toString(16);
    } catch (NoSuchAlgorithmException e) {
        StringBuilder sb = new StringBuilder("No MD5 algorithm.").append(" Could not apply validation check.");

        LOG.error(sb.toString(), e);
    } catch (UnsupportedEncodingException e) {
        LOG.error("This should not happen anyway.", e);
    }

    return encodedData;
}

From source file:ke.co.tawi.babblesms.server.utils.security.SecurityUtil.java

/**
 * Return the MD5 hahs of a String. It will work correctly for most 
 * strings. A word which does not work correctly is "michael" (check 
 * against online MD5 hash tools).   //from   ww w. j av a  2  s  .co m
 *
 * @param toHash plain text string to encryption
 * @return an md5 hashed string
 */
public static String getMD5Hash(String toHash) {
    String md5Hash = "";

    try {
        MessageDigest md = MessageDigest.getInstance("MD5");

        md.update(toHash.getBytes(), 0, toHash.length());

        md5Hash = new BigInteger(1, md.digest()).toString(16);

    } catch (NoSuchAlgorithmException e) {
        logger.error("NoSuchAlgorithmException while getting MD5 hash of '" + toHash + "'");
        logger.error(ExceptionUtils.getStackTrace(e));
    }

    return md5Hash;
}

From source file:function.Functions.java

protected static String MD5(String text) {
    String md5Text = "";
    try {/*from ww  w .  ja v a 2s  .  co  m*/
        MessageDigest digest = MessageDigest.getInstance("MD5");
        md5Text = new BigInteger(1, digest.digest((text).getBytes())).toString(16);
    } catch (Exception e) {
        System.out.println("Error in call to MD5");
    }

    if (md5Text.length() == 31) {
        md5Text = "0" + md5Text;
    }
    return md5Text;
}

From source file:Main.java

public static String getMd5Digest(String pInput) {
    try {//ww w.  j a  va 2 s  .c  o  m
        MessageDigest lDigest = MessageDigest.getInstance("MD5");
        lDigest.update(getBytes(pInput));
        BigInteger lHashInt = new BigInteger(1, lDigest.digest());
        return String.format("%1$032X", lHashInt);
    } catch (NoSuchAlgorithmException lException) {
        throw new RuntimeException(lException);
    }
}

From source file:com.l2jfree.util.HexUtil.java

/**
 * Transforms a legacy HexID into a byte array.
 * /*  w  w  w . j a  va2 s. co  m*/
 * @param string HexID
 * @return decoded byte array
 */
public static byte[] stringToHex(String string) {
    return new BigInteger(string, 16).toByteArray();
}

From source file:Main.java

/**
 * Utility method to check validity of the provided code. The version must be base 36 encoded.
 *
 * @param code the code string to check.
 * @param expectedLength the length the code must be.
 * @param codeVersionStartIndex the start index (INCLUSIVE) to get the code version from.
 * @param codeVersionEndIndex the end index (EXCLUSIVE) to get the code version from.
 * @param expectedVersion the version code that the code's version should be checked against.
 * @return true if the code passes the expected length and version checks.
 *///  ww w  .  j ava  2 s.  c o m
public static boolean isValidCode(@NonNull final String code, final int expectedLength,
        final int codeVersionStartIndex, final int codeVersionEndIndex, final int expectedVersion) {
    boolean isValid = true;

    if (code.length() != expectedLength) {
        isValid = false;
    } else {
        final String versionCode = code.substring(codeVersionStartIndex, codeVersionEndIndex);
        final BigInteger i = new BigInteger(versionCode, Character.MAX_RADIX);

        if (i.intValue() != expectedVersion) {
            isValid = false;
        }
    }

    return isValid;
}