helper.java

java 开发的一个电子邮局,挺实用的

   private static int fourBytesToInt(byte b[], int offset)
   {
      int value;

      value  =  byteToUnsigned(b[offset++]);
      value |= (byteToUnsigned(b[offset++]) <<  8);
      value |= (byteToUnsigned(b[offset++]) << 16);
      value |= (byteToUnsigned(b[offset++]) << 24);

      return(value);
   }

   private static final void intToFourBytes(int iValue, byte b[], int offset)
   {
      b[offset++] = (byte)((iValue)        & 0xff);
      b[offset++] = (byte)((iValue >>> 8 ) & 0xff);
      b[offset++] = (byte)((iValue >>> 16) & 0xff);
      b[offset++] = (byte)((iValue >>> 24) & 0xff);
   }

   private static final void PERM_OP(int a, int b, int n, int m, int results[])
   {
      int t;

      t = ((a >>> n) ^ b) & m;
      a ^= t << n;
      b ^= t;

      results[0] = a;
      results[1] = b;
   }

   private static final int HPERM_OP(int a, int n, int m)
   {
      int t;

      t = ((a << (16 - n)) ^ a) & m;
      a = a ^ t ^ (t >>> (16 - n));

      return(a);
   }

   private static int [] des_set_key(byte key[])
   {
      int schedule[] = new int[ITERATIONS * 2];

      int c = fourBytesToInt(key, 0);
      int d = fourBytesToInt(key, 4);

      int results[] = new int[2];

      PERM_OP(d, c, 4, 0x0f0f0f0f, results);
      d = results[0]; c = results[1];

      c = HPERM_OP(c, -2, 0xcccc0000);
      d = HPERM_OP(d, -2, 0xcccc0000);

      PERM_OP(d, c, 1, 0x55555555, results);
      d = results[0]; c = results[1];

      PERM_OP(c, d, 8, 0x00ff00ff, results);
      c = results[0]; d = results[1];

      PERM_OP(d, c, 1, 0x55555555, results);
      d = results[0]; c = results[1];

      d = (((d & 0x000000ff) <<  16) |  (d & 0x0000ff00)     |
           ((d & 0x00ff0000) >>> 16) | ((c & 0xf0000000) >>> 4));
      c &= 0x0fffffff;

      int s, t;
      int j = 0;

      for(int i = 0; i < ITERATIONS; i ++)
      {
         if(shifts2[i])
         {
            c = (c >>> 2) | (c << 26);
            d = (d >>> 2) | (d << 26);
         }
         else
         {
            c = (c >>> 1) | (c << 27);
            d = (d >>> 1) | (d << 27);
         }

         c &= 0x0fffffff;
         d &= 0x0fffffff;

         s = skb[0][ (c       ) & 0x3f                       ]|
             skb[1][((c >>>  6) & 0x03) | ((c >>>  7) & 0x3c)]|
             skb[2][((c >>> 13) & 0x0f) | ((c >>> 14) & 0x30)]|
             skb[3][((c >>> 20) & 0x01) | ((c >>> 21) & 0x06) |
                                          ((c >>> 22) & 0x38)];

         t = skb[4][ (d     )  & 0x3f                       ]|
             skb[5][((d >>> 7) & 0x03) | ((d >>>  8) & 0x3c)]|
             skb[6][ (d >>>15) & 0x3f                       ]|
             skb[7][((d >>>21) & 0x0f) | ((d >>> 22) & 0x30)];

         schedule[j++] = ((t <<  16) | (s & 0x0000ffff)) & 0xffffffff;
         s             = ((s >>> 16) | (t & 0xffff0000));

         s             = (s << 4) | (s >>> 28);
         schedule[j++] = s & 0xffffffff;
      }
      return(schedule);
   }

   private static final int D_ENCRYPT
   (
      int L, int R, int S, int E0, int E1, int s[]
   )
   {
      int t, u, v;

      v = R ^ (R >>> 16);
      u = v & E0;
      v = v & E1;
      u = (u ^ (u << 16)) ^ R ^ s[S];
      t = (v ^ (v << 16)) ^ R ^ s[S + 1];
      t = (t >>> 4) | (t << 28);

      L ^= SPtrans[1][(t       ) & 0x3f] |
           SPtrans[3][(t >>>  8) & 0x3f] |
           SPtrans[5][(t >>> 16) & 0x3f] |
           SPtrans[7][(t >>> 24) & 0x3f] |
           SPtrans[0][(u       ) & 0x3f] |
           SPtrans[2][(u >>>  8) & 0x3f] |
           SPtrans[4][(u >>> 16) & 0x3f] |
           SPtrans[6][(u >>> 24) & 0x3f];

      return(L);
   }

   private static final int [] body(int schedule[], int Eswap0, int Eswap1)
   {
      int left = 0;
      int right = 0;
      int t     = 0;

      for(int j = 0; j < 25; j ++)
      {
         for(int i = 0; i < ITERATIONS * 2; i += 4)
         {
            left  = D_ENCRYPT(left,  right, i,     Eswap0, Eswap1, schedule);
            right = D_ENCRYPT(right, left,  i + 2, Eswap0, Eswap1, schedule);
         }
         t     = left; 
         left  = right; 
         right = t;
      }

      t = right;

      right = (left >>> 1) | (left << 31);
      left  = (t    >>> 1) | (t    << 31);

      left  &= 0xffffffff;
      right &= 0xffffffff;

      int results[] = new int[2];

      PERM_OP(right, left, 1, 0x55555555, results); 
      right = results[0]; left = results[1];

      PERM_OP(left, right, 8, 0x00ff00ff, results); 
      left = results[0]; right = results[1];

      PERM_OP(right, left, 2, 0x33333333, results); 
      right = results[0]; left = results[1];

      PERM_OP(left, right, 16, 0x0000ffff, results);
      left = results[0]; right = results[1];

      PERM_OP(right, left, 4, 0x0f0f0f0f, results);
      right = results[0]; left = results[1];

      int out[] = new int[2];

      out[0] = left; out[1] = right;

      return(out);
   }

    /**
     * Perform a Unix crypt() operation 
     */
   public static final String crypt(String salt, String original)
   {
      while(salt.length() < 2)
         salt += "A";

      StringBuffer buffer = new StringBuffer("             ");

      char charZero = salt.charAt(0);
      char charOne  = salt.charAt(1);

      buffer.setCharAt(0, charZero);
      buffer.setCharAt(1, charOne);

      int Eswap0 = con_salt[(int)charZero];
      int Eswap1 = con_salt[(int)charOne] << 4;
 
      byte key[] = new byte[8];

      for(int i = 0; i < key.length; i ++)
         key[i] = (byte)0;

      for(int i = 0; i < key.length && i < original.length(); i ++)
      {
         int iChar = (int)original.charAt(i);

         key[i] = (byte)(iChar << 1);
      }

      int schedule[] = des_set_key(key);
      int out[]      = body(schedule, Eswap0, Eswap1);

      byte b[] = new byte[9];

      intToFourBytes(out[0], b, 0);
      intToFourBytes(out[1], b, 4);
      b[8] = 0;

      for(int i = 2, y = 0, u = 0x80; i < 13; i ++)
      {
         for(int j = 0, c = 0; j < 6; j ++)
         {
            c <<= 1;

            if(((int)b[y] & u) != 0)
               c |= 1;

            u >>>= 1;

            if(u == 0)
            {
               y++;
               u = 0x80;
            }
            buffer.setCharAt(i, (char)cov_2char[c]);
         }
      }
      return(buffer.toString());
   }

    public static String joinAddress(Address[] a) {
	String s="";
	if(a != null) {
	    for(int i=0;i<a.length;i++) {
		s+=a[i].toString()+", ";
	    }
	    if(s.length()>=2) {
		s=s.substring(0,s.length()-2);
	    }
	} else {
	    s="";
	}
	return s;
    }

    /**
     * Calculate session-ID for a session.
     *
     * @param a Adress of the remote host
     * @param h Requestheader of the remote user agent
     * @returns Session-ID
     */
    public static String calcSessionCode(InetAddress a, HTTPRequestHeader h) {
	String temp=a.toString().replace('\n',' ')
	    +h.getHeader("User-Agent").replace('\n',' ');
	temp=""+Long.toHexString(Math.abs(temp.hashCode()));
	if(h.getContent("login") != null && !h.getContent("login").equals("") && h.getPath().startsWith("/login")) {
	    temp += Long.toHexString(Math.abs(h.getContent("login").hashCode()));
	    temp += Long.toHexString(System.currentTimeMillis());
	} else if(h.getPath().startsWith("/admin/login")) {
	    temp+="admin";
	}

	return temp;
    }

    public static void main(String[] args) {
	System.err.println(Helper.crypt("AA",args[1]));
	String crypted=encryptTEA(args[1]);
	System.err.println("DES-Crypted: "+crypted);
	System.err.println("DES-Decrypted: "+decryptTEA(crypted));
    }	


    private static String str_key="39e858f86df9b909a8c87cb8d9ad599";

    public static String encryptTEA(String src) {
	byte[] key=new BigInteger(str_key, 16).toByteArray();
	TEA tea=new TEA(key);
	byte plainSource[] = src.getBytes();
	int enc[] = tea.encode(plainSource, plainSource.length);

	String s="";
	for(int i=0;i<enc.length;i++) {
	    s+=Integer.toHexString((byte)(enc[i] >>> 24)+128).toUpperCase()+":";
	    s+=Integer.toHexString((byte)(enc[i] >>> 16)+128).toUpperCase()+":";
	    s+=Integer.toHexString((byte)(enc[i] >>> 8)+128).toUpperCase()+":";
	    s+=Integer.toHexString((byte)(enc[i])+128).toUpperCase()+":";
	}
// 	System.err.println("encryptTEA: Returning "+s);
	return s;
    }
    
    public static String decryptTEA(String src) {
	StringTokenizer tok=new StringTokenizer(src,": ");
	byte[] key=new BigInteger(str_key, 16).toByteArray();
	TEA tea=new TEA(key);
	byte inb[] = new byte[tok.countTokens()];
	for(int i=0;i<inb.length && tok.hasMoreTokens();i++) {
	    String s=tok.nextToken();
	    try {
		inb[i]=(byte)(Integer.parseInt(s,16)-128);
	    } catch(NumberFormatException ex) {
		System.err.println("Could not convert string '"+s+"' to byte.");
	    }
	}
	byte dec[] = tea.decode(inb,inb.length);
	String s=new String(dec);
// 	System.err.println("encryptTEA: Returning "+s);
	return s;
    }

    /** 
     * Here we figure out which quote level this line has, simply by counting how many
     * ">" are in front of the line, ignoring all whitespaces. 
     */
    public static int getQuoteLevel(String token) {
	int current_quotelevel=0;
	for(int i=0;i<token.length() && 
		(token.substring(i).startsWith(">") || token.substring(i).startsWith(" "));
	    i++) {
	    if(token.substring(i).startsWith(">")) current_quotelevel++;
	}
	return current_quotelevel;
    }


    protected static int findFittingBreakPos(String line, int linesize) {
	int pos;
	for(pos=linesize; pos>0; pos--) {
	    switch(line.charAt(pos)) {
	    case ' ':
	    case '\n':
	    case '\t':
	    case '.':
	    case ',':
	    case ';':
	    case ':':
	    case '!':
	    case '?':
		return pos+1;
	    }
	}
	return linesize+1;
    }

    public static Enumeration breakLine(String line, int linesize, int quotelevel) {
	if(line.length() <= linesize) {
	    final String s=line;
	    return new Enumeration() {
		    int count=0;
		    public boolean hasMoreElements() {
			return count == 0;
		    }
		    
		    public Object nextElement() {
			count++;
			if(count==1) return s;
			else return null;
		    }
		};
	} else {
	    int breakpos=findFittingBreakPos(line,linesize);
	    final String first=line.substring(0,breakpos);
	    String rest="";
	    for(int i=0;i<quotelevel;i++) rest+=">";
	    rest+=line.substring(breakpos);
	    final Enumeration enum=breakLine(rest,linesize,quotelevel);
	    return new Enumeration() {
		    int count=0;
		    public boolean hasMoreElements() {
			return count < 1 || enum.hasMoreElements();
		    }

		    public Object nextElement() {
			count++;
			if(count == 1) {
			    return first;
			} else {
			    return enum.nextElement();
			}
		    }
		};
	}
    }
			   

} // Helper