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:cc.arduino.utils.FileHash.java

/**
 * Calculate a message digest of a file using the algorithm specified. The
 * result is a string containing the algorithm name followed by ":" and by the
 * resulting hash in hex.//  w w w  .java  2 s.  co  m
 *
 * @param file
 * @param algorithm For example "SHA-256"
 * @return The algorithm followed by ":" and the hash, for example:<br />
 * "SHA-256:ee6796513086080cca078cbb383f543c5e508b647a71c9d6f39b7bca41071883"
 * @throws IOException
 * @throws NoSuchAlgorithmException
 */
public static String hash(File file, String algorithm) throws IOException, NoSuchAlgorithmException {
    FileInputStream in = null;
    try {
        in = new FileInputStream(file);
        byte buff[] = new byte[10240];
        MessageDigest digest = MessageDigest.getInstance(algorithm);
        while (in.available() > 0) {
            int read = in.read(buff);
            digest.update(buff, 0, read);
        }
        byte[] hash = digest.digest();
        String res = "";
        for (byte b : hash) {
            int c = b & 0xFF;
            if (c < 0x10)
                res += "0";
            res += Integer.toHexString(c);
        }
        return algorithm + ":" + res;
    } finally {
        IOUtils.closeQuietly(in);
    }
}

From source file:BitLottoVerify.java

public static String sha256(String str) {
    try {//from w  ww .ja va  2 s.c om
        byte[] buff = str.getBytes();

        MessageDigest sig = MessageDigest.getInstance("SHA-256");
        sig.update(buff, 0, buff.length);

        byte d[] = sig.digest();
        return printBytesInHex(d);
    } catch (Exception e) {
        e.printStackTrace();
        System.exit(1);
        return null;
    }

}

From source file:com.networknt.light.util.HashUtil.java

public static String md5(String input) {

    String md5 = null;//  w  w w.  j a  v a 2 s  .c  o m

    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(), 0, input.length());

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

    } catch (NoSuchAlgorithmException e) {
        e.printStackTrace();
    }
    return md5;
}

From source file:MD5Sum.java

/**
 * Create a MD5 checksum for a file//from  ww w .  j a va2  s . c o m
 *
 * @param filename
 * @return md5sum
 * @throws Exception
 */
public static byte[] createChecksum(InputStream fis) throws NoSuchAlgorithmException, IOException {
    if (fis == null) {
        throw new FileNotFoundException("InputStream cannot be read");
    }

    byte[] buffer = new byte[1024];
    MessageDigest complete = MessageDigest.getInstance("MD5");
    int numRead;
    do {
        numRead = fis.read(buffer);
        if (numRead > 0) {
            complete.update(buffer, 0, numRead);
        }
    } while (numRead != -1);
    fis.close();
    return complete.digest();
}

From source file:Main.java

public static byte[] createChecksumBytes(String filename, String checksumType)
        throws java.io.IOException, java.security.NoSuchAlgorithmException {
    if (checksumType == null) { // MD5 by default
        checksumType = "MD5";
    }/*from w w  w.j  av  a  2  s. c  o  m*/
    java.io.InputStream fis = new java.io.FileInputStream(filename);

    byte[] buffer = new byte[1024];
    java.security.MessageDigest complete = java.security.MessageDigest.getInstance(checksumType);
    int numRead = 0;

    do {
        numRead = fis.read(buffer);
        if (numRead > 0) {
            complete.update(buffer, 0, numRead);
        }
    } while (numRead != -1);

    fis.close();
    return complete.digest();
}

From source file:Main.java

public static byte[] getFileDigest(File file, String algorithm) {
    InputStream fis = null;/*from   ww w.j  a  v a2 s . co m*/
    byte[] buffer = new byte[1024];
    int numRead;
    MessageDigest md;
    try {
        fis = new FileInputStream(file);
        md = MessageDigest.getInstance(algorithm);
        while ((numRead = fis.read(buffer)) > 0) {
            md.update(buffer, 0, numRead);
        }
        fis.close();
        return md.digest();
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        if (fis != null) {
            try {
                fis.close();
            } catch (IOException e) {
            }
        }
    }
    return null;
}

From source file:com.appbackr.android.tracker.Tracker.java

/**
  * This function performs md5 hashing. The reason for this function is because
  * android package does not have any default md5 hashing function.
  * @param s string encode as md5 hash//from   ww w  .  j a v  a2 s .c om
  * @return md5 hash string
  */
 private static String md5(String s) {
     try {
         // Create MD5 Hash
         MessageDigest digest = MessageDigest.getInstance("MD5");
         digest.update(s.getBytes(), 0, s.length());
         return new BigInteger(1, digest.digest()).toString(16);

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

     return "";
 }

From source file:com.glaf.core.security.DigestUtil.java

public static void digestFile(String filename, String algorithm) {
    byte[] b = new byte[65536];
    int read = 0;
    FileInputStream fis = null;//from   www  .  java 2s. c o  m
    FileOutputStream fos = null;
    OutputStream encodedStream = null;
    try {
        MessageDigest md = MessageDigest.getInstance(algorithm);
        fis = new FileInputStream(filename);
        while (fis.available() > 0) {
            read = fis.read(b);
            md.update(b, 0, read);
        }
        byte[] digest = md.digest();
        StringBuffer fileNameBuffer = new StringBuffer(256).append(filename).append('.').append(algorithm);
        fos = new FileOutputStream(fileNameBuffer.toString());
        encodedStream = MimeUtility.encode(fos, "base64");
        encodedStream.write(digest);
        fos.flush();
    } catch (Exception ex) {
        throw new RuntimeException("Error computing Digest: " + ex);
    } finally {
        IOUtils.closeQuietly(fis);
        IOUtils.closeQuietly(fos);
        IOUtils.closeQuietly(encodedStream);
    }
}

From source file:com.playonlinux.utils.Checksum.java

private static byte[] getDigest(InputStream inputStream, MessageDigest messageDigest) throws IOException {

    messageDigest.reset();//from  ww  w  .  java2  s.c  o  m
    byte[] bytes = new byte[BLOCK_SIZE];
    int numBytes;
    while ((numBytes = inputStream.read(bytes)) != -1) {
        messageDigest.update(bytes, 0, numBytes);
    }
    return messageDigest.digest();
}

From source file:com.cienet.util.EncryptDeciphering.java

/**
 * ?MD5?// w w w. j a va2  s .  c  o  m
 * 
 * @param inputStream
 * @return
 */
public static String streamToMD5(InputStream inputStream) {
    try {
        MessageDigest mdTemp = MessageDigest.getInstance("MD5");
        byte[] buffer = new byte[1024];
        int numRead = 0;
        while ((numRead = inputStream.read(buffer)) > 0) {
            mdTemp.update(buffer, 0, numRead);
        }
        return toHexString(mdTemp.digest());
    } catch (Exception e) {
        return null;
    }
}