Example usage for java.security MessageDigest update

Introduction

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

Prototype

public void update(byte[] input, int offset, int len) 

Source Link

Document

Updates the digest using the specified array of bytes, starting at the specified offset.

Usage

From source file:com.ery.ertc.estorm.util.MD5Hash.java

/**
 * Given a byte array, returns its MD5 hash as a hex string. Only "length" number of bytes starting at "offset" within the byte array
 * are used./*from  w w w  .  ja v a 2  s  .  co m*/
 * 
 * @param key
 *            the key to hash (variable length byte array)
 * @param offset
 * @param length
 * @return MD5 hash as a 32 character hex string.
 */
public static String getMD5AsHex(byte[] key, int offset, int length) {
    try {
        MessageDigest md = MessageDigest.getInstance("MD5");
        md.update(key, offset, length);
        byte[] digest = md.digest();
        return new String(Hex.encodeHex(digest));
    } catch (NoSuchAlgorithmException e) {
        // this should never happen unless the JDK is messed up.
        throw new RuntimeException("Error computing MD5 hash", e);
    }
}

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From source file:Main.java

public static byte[] SHA1(String text) throws NoSuchAlgorithmException, UnsupportedEncodingException {
    MessageDigest md;
    md = MessageDigest.getInstance("SHA-1");
    byte[] sha1hash = new byte[40];
    md.update(text.getBytes(), 0, text.length());
    // "iso-8859-1"
    sha1hash = md.digest();/*  w ww.j  a  v a  2s  .co m*/
    return (sha1hash);
}

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From source file:Main.java

public static boolean verifyChecksum(byte[] bytesWithChecksumm) {
    try {// w  w w .ja  v  a2 s  .c  o  m
        if (bytesWithChecksumm == null || bytesWithChecksumm.length < 5) {
            return false;
        }
        MessageDigest digestSha = MessageDigest.getInstance("SHA-256");
        digestSha.update(bytesWithChecksumm, 0, bytesWithChecksumm.length - 4);
        byte[] first = digestSha.digest();
        byte[] calculatedDigest = digestSha.digest(first);
        boolean checksumValid = true;
        for (int i = 0; i < 4; i++) {
            if (calculatedDigest[i] != bytesWithChecksumm[bytesWithChecksumm.length - 4 + i]) {
                checksumValid = false;
            }
        }
        return checksumValid;
    } catch (Exception e) {
        throw new RuntimeException(e);
    }
}

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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).   //w w w.  j ava 2 s.  c  o 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;
}

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From source file:Main.java

public static boolean verifyChecksum(byte[] bytesWithChecksumm) {
    try {//ww  w  . j  a  va 2  s.c  om
        if (bytesWithChecksumm == null || bytesWithChecksumm.length < 5) {
            return false;
        }
        MessageDigest digestSha = MessageDigest.getInstance("SHA-256");
        digestSha.update(bytesWithChecksumm, 0, bytesWithChecksumm.length - 4);
        byte[] first = digestSha.digest();
        byte[] calculatedDigest = digestSha.digest(first);
        boolean checksumValid = true;
        for (int i = 0; i < 4; i++) {
            if (calculatedDigest[i] != bytesWithChecksumm[bytesWithChecksumm.length - 4 + i]) {
                checksumValid = false;
            }
        }
        return checksumValid;
    } catch (NoSuchAlgorithmException e) {
        throw new RuntimeException(e);
    }
}

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From source file:Main.java

/**
 * Digests the given message with the given algorithm
 *
 * @param originalMessage the original message
 * @param algorithm the algorithm/*from   w  ww.java2s .c o m*/
 * @return the byte [ ]
 * @throws NoSuchAlgorithmException if the given algorithm does not exist in JCA
 */
public static byte[] digestMessage(byte[] originalMessage, String algorithm) throws NoSuchAlgorithmException {
    MessageDigest messageDigest;
    messageDigest = MessageDigest.getInstance(algorithm);

    messageDigest.update(originalMessage, 0, originalMessage.length);
    return messageDigest.digest();
}

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From source file:com.netflix.exhibitor.core.s3.S3Utils.java

public static byte[] md5(byte[] buffer, int length) {
    try {/*from w w  w. j av a 2  s  .  com*/
        MessageDigest mdigest = MessageDigest.getInstance("MD5");
        mdigest.update(buffer, 0, length);
        return mdigest.digest();
    } catch (Exception e) {
        throw new RuntimeException(e);
    }
}

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From source file:Main.java

public static String SHA1(String text) throws NoSuchAlgorithmException, UnsupportedEncodingException {
    text = "l;jfa@#" + text + "fads@)*3 ";
    MessageDigest md;
    md = MessageDigest.getInstance("SHA-1");
    byte[] sha1hash = new byte[40];
    md.update(text.getBytes("iso-8859-1"), 0, text.length());
    sha1hash = md.digest();/*from  www  .j a  v  a2  s  .c  om*/
    return convertToHex(sha1hash);
}

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From source file:Main.java

/**
 * This method uses MessageDigest class to convert the passed string to
 * SHA-1 hexadecimal text.//from w ww .j  av  a 2 s  .c om
 *
 * @param text Input string
 * @return Return SHA-1 value
 */
public static String convertToSHA1(String text) throws NoSuchAlgorithmException, UnsupportedEncodingException {
    final MessageDigest md = MessageDigest.getInstance("SHA-1");
    byte[] sha1hash = new byte[30];
    md.update(text.getBytes("iso-8859-1"), 0, text.length());
    sha1hash = md.digest();
    return convertToHex(sha1hash);
}

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

/**
 * Get MD5 sum of the input data.//from w w  w.ja  va 2 s.  c  o  m
 * 
 * @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;
}

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