Package java.security

Examples of java.security.MessageDigest.reset()

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   * @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);
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    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);
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      // 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);
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    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);
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        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);
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    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
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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;
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      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);
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      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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     */
    public static String MD5encrypt(String str) throws Exception {

        MessageDigest md = null;
        md = MessageDigest.getInstance("MD5");
        md.reset();
        md.update(str.getBytes());

        return toHexString(md.digest());
    }
   
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