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

        MockObserver peerObserver=new MockObserver();
        peer.setObserver(peerObserver);
        peer.keyServer=false;




        MessageDigest digest=MessageDigest.getInstance("MD5");
        digest.reset();
        digest.update(server.getDesKey().getEncoded());


        String symVersion=new String(digest.digest(), "UTF-8");


        // encrypt and send an initial message to peer
        Cipher cipher=server.getSymEncodingCipher();
        Message msg=new Message();
        msg.setBuffer(cipher.doFinal("hello".getBytes()));

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     * @param source the source String
     * @return the MD5 hashed version of the string
     */
    public static String md5(String source) {
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            byte[] bytes = md.digest(source.getBytes());
            return getString(bytes);
        } catch (Exception e) {
            return null;
        }
    }

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     * @param source the source String
     * @return the MD5 hashed version of the string
     */
    public static String sha(String source) {
        try {
            MessageDigest md = MessageDigest.getInstance("SHA");
            byte[] bytes = md.digest(source.getBytes());
            return getString(bytes);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }

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        String messageText="hello this is a test message";
        Cipher cipher=encrypt2.getSymEncodingCipher();
        byte[] encodedBytes=cipher.doFinal(messageText.getBytes());
        assert !new String(encodedBytes).equals(messageText);


        MessageDigest digest=MessageDigest.getInstance("MD5");
        digest.reset();
        digest.update(encrypt.getDesKey().getEncoded());


        String symVersion=new String(digest.digest(), "UTF-8");


        Message msg=new Message(null, null, encodedBytes);
        msg.putHeader(ENCRYPT_ID, new ENCRYPT.EncryptHeader(ENCRYPT.EncryptHeader.ENCRYPT, symVersion));
        Event event=new Event(Event.MSG, msg);
        encrypt.up(event);

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        String messageText="hello this is a test message";
        Cipher cipher=encrypt2.getSymEncodingCipher();
        byte[] encodedBytes=cipher.doFinal(messageText.getBytes());
        assert !new String(encodedBytes).equals(messageText);


        MessageDigest digest=MessageDigest.getInstance("MD5");
        digest.reset();
        digest.update(encrypt2.getDesKey().getEncoded());


        String symVersion=new String(digest.digest());


        Message msg=new Message(null, null, encodedBytes);
        msg.putHeader(ENCRYPT_ID, new ENCRYPT.EncryptHeader(ENCRYPT.EncryptHeader.ENCRYPT, symVersion));
        Event event=new Event(Event.MSG, msg);
        encrypt.up(event);

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        encrypt.setObserver(observer);


        // produce encrypted message
        Cipher cipher=encrypt.getSymEncodingCipher();


        MessageDigest digest=MessageDigest.getInstance("MD5");
        digest.reset();
        digest.update(encrypt.getDesKey().getEncoded());


        String symVersion=new String(digest.digest(), "UTF-8");


        encrypt.keyServer=false;
        Message msg=new Message();
        msg.setBuffer(cipher.doFinal("hello".getBytes()));
        msg.putHeader(ENCRYPT_ID, new EncryptHeader(EncryptHeader.ENCRYPT, symVersion));

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  private Password(){
  }


  public synchronized String encrypt(String plaintext)
  {
    MessageDigest md = null;
    try
    {
      md = MessageDigest.getInstance("SHA1"); 
    }
    catch(NoSuchAlgorithmException noSuchAlgorithmException)
    {
    noSuchAlgorithmException.printStackTrace();
    }//end of catch block
    
    try
    {
      md.update(plaintext.getBytes("UTF-8")); 
    }
    catch(UnsupportedEncodingException unsupportedEncodingException)
    {
    unsupportedEncodingException.printStackTrace();
    }//end of catch block
    byte raw[] = md.digest(); 
    String hash = (new BASE64Encoder()).encode(raw); 
    return hash; 
  }//end of encrypt(String plaintext)

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      KeyAgreement ka = KeyAgreement.getInstance(ALGORITHM);
      ka.init(privateKey);
      ka.doPhase(publicKey, true);
      byte[] secret = ka.generateSecret();


      MessageDigest sha = MessageDigest.getInstance(DIGEST);
      byte[] hash = sha.digest(secret);
      byte[] symKey = new byte[keySize / 8];
      System.arraycopy(hash, 0, symKey, 0, symKey.length);
      return SymmetricCryptor.getSymmectricCryptor(symKey);
    } catch (NoSuchAlgorithmException e) {
      throw new CryptoException(e);

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     * @throws IOException
     * @throws NoSuchAlgorithmException
     */
    private String md5(InputStream is) throws IOException,
            NoSuchAlgorithmException {
        MessageDigest digest = MessageDigest.getInstance("MD5");
        DigestInputStream dis = new DigestInputStream(is, digest);


        byte[] buffer = new byte[1024];


        int read = dis.read(buffer);

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     * @return the encrypted password, or null if encryption failed.
     */
    public static String encryptPassword( String password ) {


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


            //Create the encrypted Byte[]
            md.update( password.getBytes() );
            byte[] hash = md.digest();


            //Convert the byte array into a String


            StringBuffer hashStringBuf = new StringBuffer();
            String byteString;

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