public void update(byte[] input) {engineUpdate(input, 0, input.length);state = IN_PROGRESS;
}

public byte[] digest() {/* Resetting is the responsibility of implementors. */byte[] result = engineDigest();state = INITIAL;return result;
}

public class MD5 {
private static final byte[] ToHex_ =
{ '0','1','2','3','4','5','6','7',
'8','9','a','b','c','d','e','f'
};
private MessageDigest md5_ = null;
static private MessageDigest Md5_;
static
{
try { Md5_ = MessageDigest.getInstance("MD5");} // MD5 is supported
catch ( NoSuchAlgorithmException e ) {}; // safe to swallow
};public MD5()
{
try { md5_ = MessageDigest.getInstance("MD5");} // MD5 is supported
catch ( NoSuchAlgorithmException e ) {}; // safe to swallow
}
/**
*
*/
public static synchronized String Digest(byte[] dataToHash)
{
Md5_.update(dataToHash, 0, dataToHash.length);
return HexStringFromBytes( Md5_.digest() );
}
/**
* Non-threadsafe MD5 digest (hashing) function
*/
public String digest(byte[] dataToHash)
{
md5_.update(dataToHash, 0, dataToHash.length);
return HexStringFromBytes( md5_.digest() );
}
private static String HexStringFromBytes(byte[] b)
{
byte [] hex_bytes = new byte[ b.length * 2 ];
int i,j=0;
for (i=0; i < b.length; i++)
{
hex_bytes[j] = ToHex_[ ( b[i] & 0xF0 ) >> 4 ] ;
hex_bytes[j+1] = ToHex_[ b[i] & 0xF ];
j+=2;
}
return new String( hex_bytes );
}
}

class  MD5_test {  public   final   static  String MD5(String s) {  char  hexDigits[] = {  '0' ,  '1' ,  '2' ,  '3' ,  '4' ,  '5' ,  '6' ,  '7' ,  '8' ,  '9' ,  'a' ,  'b' ,  'c' ,  'd' ,  'e' ,  'f'  };  try  {  byte [] strTemp = s.getBytes();  MessageDigest mdTemp = MessageDigest.getInstance("MD5" );  mdTemp.update(strTemp);  byte [] md = mdTemp.digest();  int  j = md.length;  char  str[] =  new   char [j *  2 ];  int  k =  0 ;  for  ( int  i =  0 ; i < j; i++) {  byte  byte0 = md[i];  str[k++] = hexDigits[byte0 >>> 4  &  0xf ];  str[k++] = hexDigits[byte0 & 0xf ];  }  return   new  String(str);  } catch  (Exception e) {  return   null ;  }  }  public   static   void  main(String[] args) {  // MD5_Test aa = new MD5_Test();   System.out.print(MD5_test.MD5("a" ));
//  System.out.print(MD5_test.MD5("%7B%7DAHRCU" ));  }
}