package zte.util;
import java.io.*; // needed only for main() method.
/**
* 将字符串用64位加密算法加密
* Title: 销售自动化软件
* Description: 实现销售人员能够将销售过程通过一个软件就能管理起来。同时相互之间能够共享信息。
* 兼容以前的ACT,OUTLOOK软件。
* 与OFFICE软件集成。
* Copyright: Copyright (c) 2001
* Company: TCL企业软件有限责任公司
* @author TONY.郑
* @date 17 March 2000
* @version 1.0
*/
//////////////////////license & copyright header/////////////////////////
// //
// Base64 - encode/decode data using the Base64 encoding scheme //
// //
// Copyright (c) 1998 by Kevin Kelley //
// //
// This library is free software; you can redistribute it and/or //
// modify it under the terms of the GNU Lesser General Public //
// License as published by the Free Software Foundation; either //
// version 2.1 of the License, or (at your option) any later version. //
// //
// This library is distributed in the hope that it will be useful, //
// but WITHOUT ANY WARRANTY; without even the implied warranty of //
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
// GNU Lesser General Public License for more details. //
// //
// You should have received a copy of the GNU Lesser General Public //
// License along with this library; if not, write to the Free Software //
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA //
// 02111-1307, USA, or contact the author: //
// //
// Kevin Kelley
// 81050 USA. //
// //
////////////////////end license & copyright header///////////////////////
import java.io.*; // needed only for main() method.
/**
* Provides encoding of raw bytes to base64-encoded characters, and
* decoding of base64 characters to raw bytes.
* 用于加密算法，64位加密软件
* @author Kevin Kelley (kelley@ruralnet.net)
* @version 1.3
* @date 06 August 1998
* @modified 14 February 2000
* @modified 22 September 2000
*/
public class Base64 {
/**
* returns an array of base64-encoded characters to represent the
* passed data array.
*
* @param data the array of bytes to encode
* @return base64-coded character array.
*/
static public char[] encode(byte[] data)
{
char[] out = new char[((data.length + 2) / 3) * 4];
//
// 3 bytes encode to 4 chars. Output is always an even
// multiple of 4 characters.
//
for (int i=0, index=0; i boolean quad = false; boolean trip = false; int val = (0xFF & (int) data[i]); val <<= 8; if ((i+1) < data.length) { val |= (0xFF & (int) data[i+1]); trip = true; } val <<= 8; if ((i+2) < data.length) { val |= (0xFF & (int) data[i+2]); quad = true; } out[index+3] = alphabet[(quad? (val & 0x3F): 64)]; val >>= 6; out[index+2] = alphabet[(trip? (val & 0x3F): 64)]; val >>= 6; out[index+1] = alphabet[val & 0x3F]; val >>= 6; out[index+0] = alphabet[val & 0x3F]; } return out; } /** * Decodes a BASE-64 encoded stream to recover the original * data. White space before and after will be trimmed away, * but no other manipulation of the input will be performed. * * As of version 1.2 this method will properly handle input * containing junk characters (newlines and the like) rather * than throwing an error. It does this by pre-parsing the * input and generating from that a count of VALID input * characters. **/ static public byte[] decode(char[] data) { // as our input could contain non-BASE64 data (newlines, // whitespace of any sort, whatever) we must first adjust // our count of USABLE data so that... // (a) we don't misallocate the output array, and // (b) think that we miscalculated our data length // just because of extraneous throw-away junk int tempLen = data.length; for( int ix=0; ix { if( (data[ix] > 255) || codes[ data[ix] ] < 0 ) --tempLen; // ignore non-valid chars and padding } // calculate required length: // -- 3 bytes for every 4 valid base64 chars // -- plus 2 bytes if there are 3 extra base64 chars, // or plus 1 byte if there are 2 extra. int len = (tempLen / 4) * 3; if ((tempLen % 4) == 3) len += 2; if ((tempLen % 4) == 2) len += 1; byte[] out = new byte[len]; int shift = 0; // # of excess bits stored in accum int accum = 0; // excess bits int index = 0; // we now go through the entire array (NOT using the 'tempLen' value) for (int ix=0; ix { int value = (data[ix]>255)? -1: codes[ data[ix] ]; if ( value >= 0 ) // skip over non-code { accum <<= 6; // bits shift up by 6 each time thru shift += 6; // loop, with new bits being put in accum |= value; // at the bottom. if ( shift >= 8 ) // whenever there are 8 or more shifted in, { shift -= 8; // write them out (from the top, leaving any out[index++] = // excess at the bottom for next iteration. (byte) ((accum >> shift) & 0xff); } } // we will also have skipped processing a padding null byte ('=') here; // these are used ONLY for padding to an even length and do not legally // occur as encoded data. for this reason we can ignore the fact that // no index++ operation occurs in that special case: the out[] array is // initialized to all-zero bytes to start with and that works to our // advantage in this combination. } // if there is STILL something wrong we just have to throw up now! if( index != out.length) { throw new Error("Miscalculated data length (wrote " + index + " instead of " + out.length + ")"); } return out; } // // code characters for values 0..63 // static private char[] alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=" .toCharArray(); // // lookup table for converting base64 characters to value in range 0..63 // static private byte[] codes = new byte[256]; static { for (int i=0; i<256; i++) codes[i] = -1; for (int i = 'A'; i <= 'Z'; i++) codes[i] = (byte)( i - 'A'); for (int i = 'a'; i <= 'z'; i++) codes[i] = (byte)(26 + i - 'a'); for (int i = '0'; i <= '9'; i++) codes[i] = (byte)(52 + i - '0'); codes['+'] = 62; codes['/'] = 63; } /////////////////////////////////////////////////// // remainder (main method and helper functions) is // for testing purposes only, feel free to clip it. /////////////////////////////////////////////////// public static void main(String[] args) { boolean decode = false; if (args.length == 0) { System.out.println("usage: java Base64 [-d[ecode]] filename"); System.exit(0); } for (int i=0; i if ("-decode".equalsIgnoreCase(args[i])) decode = true; else if ("-d".equalsIgnoreCase(args[i])) decode = true; } String filename = args[args.length-1]; File file = new File(filename); if (!file.exists()) { System.out.println("Error: file '" + filename + "' doesn't exist!"); System.exit(0); } if (decode) { char[] encoded = readChars(file); byte[] decoded = decode(encoded); writeBytes(file, decoded); } else { byte[] decoded = readBytes(file); char[] encoded = encode(decoded); writeChars(file, encoded); } } private static byte[] readBytes(File file) { ByteArrayOutputStream baos = new ByteArrayOutputStream(); try { InputStream fis = new FileInputStream(file); InputStream is = new BufferedInputStream(fis); int count = 0; byte[] buf = new byte[16384]; while ((count=is.read(buf)) != -1) { if (count > 0) baos.write(buf, 0, count); } is.close(); } catch (Exception e) { e.printStackTrace(); } return baos.toByteArray(); } private static char[] readChars(File file) { CharArrayWriter caw = new CharArrayWriter(); try { Reader fr = new FileReader(file); Reader in = new BufferedReader(fr); int count = 0; char[] buf = new char[16384]; while ((count=in.read(buf)) != -1) { if (count > 0) caw.write(buf, 0, count); } in.close(); } catch (Exception e) { e.printStackTrace(); } return caw.toCharArray(); } private static void writeBytes(File file, byte[] data) { try { OutputStream fos = new FileOutputStream(file); OutputStream os = new BufferedOutputStream(fos); os.write(data); os.close(); } catch (Exception e) { e.printStackTrace(); } } private static void writeChars(File file, char[] data) { try { Writer fos = new FileWriter(file); Writer os = new BufferedWriter(fos); os.write(data); os.close(); } catch (Exception e) { e.printStackTrace(); } } /////////////////////////////////////////////////// // end of test code. /////////////////////////////////////////////////// }