Examples of java.security.MessageDigest

java.security.MessageDigest
This MessageDigest class provides applications the functionality of a message digest algorithm, such as MD5 or SHA. Message digests are secure one-way hash functions that take arbitrary-sized data and output a fixed-length hash value.
A MessageDigest object starts out initialized. The data is processed through it using the {@link #update(byte) update}methods. At any point {@link #reset() reset} can be calledto reset the digest. Once all the data to be updated has been updated, one of the {@link #digest() digest} methods should be called to complete the hash computation.
The digest method can be called once for a given number of updates. After digest has been called, the MessageDigest object is reset to its initialized state.
Implementations are free to implement the Cloneable interface. Client applications can test cloneability by attempting cloning and catching the CloneNotSupportedException:
```
 MessageDigest md = MessageDigest.getInstance("SHA"); try { md.update(toChapter1); MessageDigest tc1 = md.clone(); byte[] toChapter1Digest = tc1.digest(); md.update(toChapter2); ...etc. } catch (CloneNotSupportedException cnse) { throw new DigestException("couldn't make digest of partial content"); } 
```
Note that if a given implementation is not cloneable, it is still possible to compute intermediate digests by instantiating several instances, if the number of digests is known in advance.
Note that this class is abstract and extends from MessageDigestSpi for historical reasons. Application developers should only take notice of the methods defined in this MessageDigest class; all the methods in the superclass are intended for cryptographic service providers who wish to supply their own implementations of message digest algorithms. @author Benjamin Renaud @version 1.82, 09/07/09 @see DigestInputStream @see DigestOutputStream


    logger.debug("isValidLicenseFile: Validation String Buffer: "+validationStringBuffer.toString());
    String validationKey = (String)properties.getProperty(LICENSE_FILE_SHA_KEY);
    try
    {
      MessageDigest messageDigest = MessageDigest.getInstance("SHA-1");
      messageDigest.update(validationStringBuffer.toString().getBytes());
      String newValidation = Base64.encode(messageDigest.digest());
      if (newValidation.equals(validationKey))
      {
        if (getMACAddress().equals(Settings.getInstance().getMACAddress()))
        {
          returnValue = true;

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    documentID = createDocumentId();
    setupByUserPad(this.documentID, userPad, this.ownerKey, permissions);
  }


  public static byte[] createDocumentId() {
    MessageDigest md5;
    try {
      md5 = MessageDigest.getInstance("MD5");
    } catch (Exception e) {
      throw new ExceptionConverter(e);
    }
    long time = System.currentTimeMillis();
    long mem = Runtime.getRuntime().freeMemory();
    String s = time + "+" + mem + "+" + (seq++);
    return md5.digest(s.getBytes());
  }

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          dic.put(PdfName.STRF, PdfName.DEFAULTCRYPTFILER);
          dic.put(PdfName.STMF, PdfName.DEFAULTCRYPTFILER);
        }
      }


      MessageDigest md = null;
      byte[] encodedRecipient = null;


      try {
        md = MessageDigest.getInstance("SHA-1");
        md.update(publicKeyHandler.getSeed());
        for (int i = 0; i < publicKeyHandler.getRecipientsSize(); i++) {
          encodedRecipient = publicKeyHandler.getEncodedRecipient(i);
          md.update(encodedRecipient);
        }
        if (!encryptMetadata)
          md.update(new byte[] { (byte) 255, (byte) 255, (byte) 255,
              (byte) 255 });
      } catch (Exception f) {
        throw new ExceptionConverter(f);
      }


      byte[] mdResult = md.digest();


      setupByEncryptionKey(mdResult, keyLength);
    } else {
      dic.put(PdfName.FILTER, PdfName.STANDARD);
      dic.put(PdfName.O, new PdfLiteral(PdfContentByte

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        response.sendError( HttpURLConnection.HTTP_UNAUTHORIZED, Http.getStatusPhrase( HttpURLConnection.HTTP_UNAUTHORIZED ));
        return true;
    }


    private static String hashPassword(String password) throws NoSuchAlgorithmException {
        MessageDigest md5 = MessageDigest.getInstance("MD5");
        byte[] md5password = md5.digest( password.getBytes() );
        BASE64Encoder encoder = new BASE64Encoder();
        return encoder.encode( md5password );
    }

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                    case MD5:


                        // Compare hashed password
                        try {
                            MessageDigest digest = MessageDigest.getInstance("MD5");
                            String hashedPassword = getHexString(digest.digest(password.getBytes()));
                            return hashedPassword.equals(auth_password.toUpperCase());
                        }
                        catch (NoSuchAlgorithmException e) {
                            throw new UnsupportedOperationException("Unexpected lack of MD5 support.", e);
                        }

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/**
 * @author Hans Dockter
 */
public class HashUtil {
    public static String createHash(String scriptText) {
        MessageDigest messageDigest;
        try {
            messageDigest = MessageDigest.getInstance("MD5");
        } catch (NoSuchAlgorithmException e) {
            throw UncheckedException.asUncheckedException(e);
        }
        messageDigest.update(scriptText.getBytes());
        return new BigInteger(1, messageDigest.digest()).toString(16);
    }

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        messageDigest.update(scriptText.getBytes());
        return new BigInteger(1, messageDigest.digest()).toString(16);
    }


    public static byte[] createHash(File file) {
        MessageDigest messageDigest;
        try {
            messageDigest = MessageDigest.getInstance("MD5");
        } catch (NoSuchAlgorithmException e) {
            throw UncheckedException.asUncheckedException(e);
        }
        try {
            byte[] buffer = new byte[4096];
            InputStream instr = new FileInputStream(file);
            try {
                while (true) {
                    int nread = instr.read(buffer);
                    if (nread < 0) {
                        break;
                    }
                    messageDigest.update(buffer, 0, nread);
                }
            } finally {
                instr.close();
            }
        } catch (IOException e) {
            throw new UncheckedIOException(e);
        }
        return messageDigest.digest();
    }

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        if (s.length() % 2 != 0) s = "0" + s;
        return s;
    }


    public static String MD5(String toEncode) throws NoSuchAlgorithmException, UnsupportedEncodingException {
        MessageDigest digest = MessageDigest.getInstance("MD5");
        digest.update(toEncode.getBytes("ISO-8859-1"));
        return ByteUtils.toHex(digest.digest());
    }

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        final String signature = buffer.toString();


        Long serialVersionUID = new Long(0L);
        try
        {
            MessageDigest md = MessageDigest.getInstance("SHA");
            byte[] hashBytes = md.digest(signature.getBytes());


            long hash = 0;
            for (int ctr = Math.min(hashBytes.length, 8) - 1; ctr >= 0; ctr--)
            {
                hash = (hash << 8) | (hashBytes[ctr] & 0xFF);

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        final String signature = buffer.toString();


        Long serialVersionUID = new Long(0L);
        try
        {
            MessageDigest md = MessageDigest.getInstance("SHA");
            byte[] hashBytes = md.digest(signature.getBytes());


            long hash = 0;
            for (int ctr = Math.min(hashBytes.length, 8) - 1; ctr >= 0; ctr--)
            {
                hash = (hash << 8) | (hashBytes[ctr] & 0xFF);

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