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

  protected byte[] createRequestAuthenticator(String sharedSecret) {
    byte[] secretBytes = RadiusUtil.getUtf8Bytes(sharedSecret);
    byte[] randomBytes = new byte[16];
    random.nextBytes(randomBytes);      


    MessageDigest md5 = getMd5Digest();
    md5.reset();
         md5.update(secretBytes);
         md5.update(randomBytes);
    return md5.digest();
  }

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   * @param attributes encoded attributes of response packet
   * @param requestAuthenticator request packet authenticator
   * @return new 16 byte response authenticator
   */
  protected byte[] createResponseAuthenticator(String sharedSecret, int packetLength, byte[] attributes, byte[] requestAuthenticator) {
    MessageDigest md5 = getMd5Digest();
    md5.reset();
        md5.update((byte)getPacketType());
        md5.update((byte)getPacketIdentifier());
        md5.update((byte)(packetLength >> 8));
        md5.update((byte)(packetLength & 0x0ff));
        md5.update(requestAuthenticator, 0, requestAuthenticator.length);
        md5.update(attributes, 0, attributes.length);
        md5.update(RadiusUtil.getUtf8Bytes(sharedSecret));
        return md5.digest();    
  }

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  protected byte[] updateRequestAuthenticator(String sharedSecret, int packetLength, byte[] attributes) {
    byte[] authenticator = new byte[16];
    for (int i = 0; i < 16; i++)
      authenticator[i] = 0;
    
    MessageDigest md5 = getMd5Digest();
        md5.reset();
        md5.update((byte)getPacketType());
        md5.update((byte)getPacketIdentifier());
        md5.update((byte)(packetLength >> 8));
        md5.update((byte)(packetLength & 0xff));
        md5.update(authenticator, 0, authenticator.length);
        md5.update(attributes, 0, attributes.length);
        md5.update(RadiusUtil.getUtf8Bytes(sharedSecret));
        return md5.digest();
  }

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      for (int i = userPassBytes.length; i < encryptedPass.length; i++) {
          encryptedPass[i] = 0;
      }
  
      // digest shared secret and authenticator
      MessageDigest md5 = getMd5Digest();
    byte[] lastBlock = new byte[16];
    
    for (int i = 0; i < encryptedPass.length; i+=16) {
      md5.reset();
      md5.update(sharedSecret);
      md5.update(i == 0 ? getAuthenticator() : lastBlock);
      byte bn[] = md5.digest();
        
      System.arraycopy(encryptedPass, i, lastBlock, 0, 16);
    
      // perform the XOR as specified by RFC 2865.
      for (int j = 0; j < 16; j++)

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      logger.warn("invalid Radius packet: User-Password attribute with malformed PAP password, length = " +
          encryptedPass.length + ", but length must be greater than 15");
      throw new RadiusException("malformed User-Password attribute");
    }
    
    MessageDigest md5 = getMd5Digest();
    byte[] lastBlock = new byte[16];
    
    for (int i = 0; i < encryptedPass.length; i+=16) {
      md5.reset();
      md5.update(sharedSecret);
      md5.update(i == 0 ? getAuthenticator() : lastBlock);
      byte bn[] = md5.digest();
        
      System.arraycopy(encryptedPass, i, lastBlock, 0, 16);
    
      // perform the XOR as specified by RFC 2865.
      for (int j = 0; j < 16; j++)

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        // see RFC 2865 section 2.2
        byte chapIdentifier = (byte)random.nextInt(256);
        byte[] chapPassword = new byte[17];
        chapPassword[0] = chapIdentifier;


        MessageDigest md5 = getMd5Digest();
        md5.reset();
        md5.update(chapIdentifier);
        md5.update(RadiusUtil.getUtf8Bytes(plaintext));
        byte[] chapHash = md5.digest(chapChallenge);


        System.arraycopy(chapHash, 0, chapPassword, 1, 16);
        return chapPassword;
  }

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      throw new RadiusException("CHAP challenge must be 16 bytes");
    if (chapPassword == null || chapPassword.length != 17)
      throw new RadiusException("CHAP password must be 17 bytes");
    
    byte chapIdentifier = chapPassword[0];
    MessageDigest md5 = getMd5Digest();
      md5.reset();
      md5.update(chapIdentifier);
      md5.update(RadiusUtil.getUtf8Bytes(plaintext));
      byte[] chapHash = md5.digest(chapChallenge);
      
      // compare
      for (int i = 0; i < 16; i++)
        if (chapHash[i] != chapPassword[i + 1])
          return false;

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  protected byte[] updateRequestAuthenticator(String sharedSecret,
      int packetLength, byte[] attributes) {
    byte[] authenticator = new byte[16];
    for (int i = 0; i < 16; i++)
      authenticator[i] = 0;
    MessageDigest md5 = getMd5Digest();
    md5.reset();
    md5.update((byte) getPacketType());
    md5.update((byte) getPacketIdentifier());
    md5.update((byte) (packetLength >> 8));
    md5.update((byte) (packetLength & 0xff));
    md5.update(authenticator, 0, authenticator.length);
    md5.update(attributes, 0, attributes.length);
    md5.update(RadiusUtil.getUtf8Bytes(sharedSecret));
    return md5.digest();
  }

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public class HashUtil {


  public static String getMD5(final String data) {
    try {
      MessageDigest m = MessageDigest.getInstance("MD5");
      m.reset();
      m.update(data.getBytes());
      BigInteger bigInt = new BigInteger(1, m.digest());
      String hashtext = bigInt.toString(16);
      while(hashtext.length() < 32 ){
          hashtext = "0" + hashtext;
      }
      return hashtext;

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     * @throws java.lang.Exception
     */
    public static String encrypt( String text, String algName ) throws Exception {


      BASE64Encoder encoder = null;
      MessageDigest md      = null;
      encoder = new BASE64Encoder();
      md = MessageDigest.getInstance(algName);
      md.reset();
      md.update(text.getBytes());
      return encoder.encode(md.digest());


    }

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