001: /*
002: * SSHTools - Java SSH2 API
003: *
004: * Copyright (C) 2002-2003 Lee David Painter and Contributors.
005: *
006: * Contributions made by:
007: *
008: * Brett Smith
009: * Richard Pernavas
010: * Erwin Bolwidt
011: *
012: * This program is free software; you can redistribute it and/or
013: * modify it under the terms of the GNU General Public License
014: * as published by the Free Software Foundation; either version 2
015: * of the License, or (at your option) any later version.
016: *
017: * This program is distributed in the hope that it will be useful,
018: * but WITHOUT ANY WARRANTY; without even the implied warranty of
019: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
020: * GNU General Public License for more details.
021: *
022: * You should have received a copy of the GNU General Public License
023: * along with this program; if not, write to the Free Software
024: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
025: */
026: package com.sshtools.j2ssh.util;
027:
028: /**
029: *
030: *
031: * @author $author$
032: * @version $Revision: 1.15 $
033: */
034: public class Base64 {
035: /** */
036: public final static boolean ENCODE = true;
037:
038: /** */
039: public final static boolean DECODE = false;
040: private final static int MAX_LINE_LENGTH = 76;
041: private final static byte EQUALS_SIGN = (byte) '=';
042: private final static byte NEW_LINE = (byte) '\n';
043: private final static byte[] ALPHABET = { (byte) 'A', (byte) 'B',
044: (byte) 'C', (byte) 'D', (byte) 'E', (byte) 'F', (byte) 'G',
045: (byte) 'H', (byte) 'I', (byte) 'J', (byte) 'K', (byte) 'L',
046: (byte) 'M', (byte) 'N', (byte) 'O', (byte) 'P', (byte) 'Q',
047: (byte) 'R', (byte) 'S', (byte) 'T', (byte) 'U', (byte) 'V',
048: (byte) 'W', (byte) 'X', (byte) 'Y', (byte) 'Z', (byte) 'a',
049: (byte) 'b', (byte) 'c', (byte) 'd', (byte) 'e', (byte) 'f',
050: (byte) 'g', (byte) 'h', (byte) 'i', (byte) 'j', (byte) 'k',
051: (byte) 'l', (byte) 'm', (byte) 'n', (byte) 'o', (byte) 'p',
052: (byte) 'q', (byte) 'r', (byte) 's', (byte) 't', (byte) 'u',
053: (byte) 'v', (byte) 'w', (byte) 'x', (byte) 'y', (byte) 'z',
054: (byte) '0', (byte) '1', (byte) '2', (byte) '3', (byte) '4',
055: (byte) '5', (byte) '6', (byte) '7', (byte) '8', (byte) '9',
056: (byte) '+', (byte) '/' };
057: private final static byte[] DECODABET = { -9, -9, -9, -9, -9, -9,
058: -9, -9, -9, -5, -5, -9, -9, -5, -9, -9, -9, -9, -9, -9, -9,
059: -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -5, -9, -9, -9,
060: -9, -9, -9, -9,
061: -9,
062: -9,
063: -9,
064: // Decimal 33 - 42
065: 62,
066: -9,
067: -9,
068: -9,
069: // Decimal 44 - 46
070: 63,
071: // Slash at decimal 47
072: 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -9, -9, -9, -1, -9,
073: -9,
074: -9,
075: // Decimal 62 - 64
076: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12,
077: 13,
078: // Letters 'A' through 'N'
079: 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -9, -9, -9,
080: -9, -9, -9,
081:
082: // Decimal 91 - 96
083: 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38,
084: // Letters 'a' through 'm'
085: 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -9, -9,
086: -9, -9 };
087: private final static byte BAD_ENCODING = -9;
088:
089: // Indicates error in encoding
090: private final static byte white_SPACE_ENC = -5;
091:
092: // Indicates white space in encoding
093: private final static byte EQUALS_SIGN_ENC = -1;
094:
095: // Indicates equals sign in encoding
096: private Base64() {
097: }
098:
099: /**
100: *
101: *
102: * @param s
103: *
104: * @return
105: */
106: public static byte[] decode(String s) {
107: byte[] bytes = s.getBytes();
108:
109: return decode(bytes, 0, bytes.length);
110: }
111:
112: // end decode
113: public static byte[] decode(byte[] source, int off, int len) {
114: int len34 = (len * 3) / 4;
115: byte[] outBuff = new byte[len34];
116:
117: // Upper limit on size of output
118: int outBuffPosn = 0;
119: byte[] b4 = new byte[4];
120: int b4Posn = 0;
121: int i = 0;
122: byte sbiCrop = 0;
123: byte sbiDecode = 0;
124:
125: for (i = 0; i < len; i++) {
126: sbiCrop = (byte) (source[i] & 0x7f);
127:
128: // Only the low seven bits
129: sbiDecode = DECODABET[sbiCrop];
130:
131: if (sbiDecode >= white_SPACE_ENC) {
132: // White space, Equals sign or better
133: if (sbiDecode >= EQUALS_SIGN_ENC) {
134: b4[b4Posn++] = sbiCrop;
135:
136: if (b4Posn > 3) {
137: outBuffPosn += decode4to3(b4, 0, outBuff,
138: outBuffPosn);
139: b4Posn = 0;
140:
141: // If that was the equals sign, break out of 'for' loop
142: if (sbiCrop == EQUALS_SIGN) {
143: break;
144: }
145: }
146:
147: // end if: quartet built
148: }
149:
150: // end if: equals sign or better
151: }
152: // end if: white space, equals sign or better
153: else {
154: System.err.println("Bad Base64 input character at " + i
155: + ": " + source[i] + "(decimal)");
156:
157: return null;
158: }
159:
160: // end else:
161: }
162:
163: // each input character
164: byte[] out = new byte[outBuffPosn];
165: System.arraycopy(outBuff, 0, out, 0, outBuffPosn);
166:
167: return out;
168: }
169:
170: // end decode
171: public static Object decodeToObject(String encodedObject) {
172: byte[] objBytes = decode(encodedObject);
173: java.io.ByteArrayInputStream bais = null;
174: java.io.ObjectInputStream ois = null;
175:
176: try {
177: bais = new java.io.ByteArrayInputStream(objBytes);
178: ois = new java.io.ObjectInputStream(bais);
179:
180: return ois.readObject();
181: }
182: // end try
183: catch (java.io.IOException e) {
184: e.printStackTrace();
185:
186: return null;
187: }
188: // end catch
189: catch (java.lang.ClassNotFoundException e) {
190: e.printStackTrace();
191:
192: return null;
193: }
194: // end catch
195: finally {
196: try {
197: bais.close();
198: } catch (Exception e) {
199: }
200:
201: try {
202: ois.close();
203: } catch (Exception e) {
204: }
205: }
206:
207: // end finally
208: }
209:
210: // end decodeObject
211: public static String decodeToString(String s) {
212: return new String(decode(s));
213: }
214:
215: // end decodeToString
216: public static String encodeBytes(byte[] source,
217: boolean ignoreMaxLineLength) {
218: return encodeBytes(source, 0, source.length,
219: ignoreMaxLineLength);
220: }
221:
222: // end encodeBytes
223: public static String encodeBytes(byte[] source, int off, int len,
224: boolean ignoreMaxLineLength) {
225: int len43 = (len * 4) / 3;
226: byte[] outBuff = new byte[(len43) + (((len % 3) > 0) ? 4 : 0)
227: + (len43 / MAX_LINE_LENGTH)];
228:
229: // New lines
230: int d = 0;
231: int e = 0;
232: int len2 = len - 2;
233: int lineLength = 0;
234:
235: for (; d < len2; d += 3, e += 4) {
236: encode3to4(source, d + off, 3, outBuff, e);
237: lineLength += 4;
238:
239: if (!ignoreMaxLineLength) {
240: if (lineLength == MAX_LINE_LENGTH) {
241: outBuff[e + 4] = NEW_LINE;
242: e++;
243: lineLength = 0;
244: }
245:
246: // end if: end of line
247: }
248: }
249:
250: // en dfor: each piece of array
251: if (d < len) {
252: encode3to4(source, d + off, len - d, outBuff, e);
253: e += 4;
254: }
255:
256: // end if: some padding needed
257: return new String(outBuff, 0, e);
258: }
259:
260: // end encodeBytes
261: public static String encodeObject(
262: java.io.Serializable serializableObject) {
263: java.io.ByteArrayOutputStream baos = null;
264: java.io.OutputStream b64os = null;
265: java.io.ObjectOutputStream oos = null;
266:
267: try {
268: baos = new java.io.ByteArrayOutputStream();
269: b64os = new Base64.OutputStream(baos, Base64.ENCODE);
270: oos = new java.io.ObjectOutputStream(b64os);
271: oos.writeObject(serializableObject);
272: }
273: // end try
274: catch (java.io.IOException e) {
275: e.printStackTrace();
276:
277: return null;
278: }
279: // end catch
280: finally {
281: try {
282: oos.close();
283: } catch (Exception e) {
284: }
285:
286: try {
287: b64os.close();
288: } catch (Exception e) {
289: }
290:
291: try {
292: baos.close();
293: } catch (Exception e) {
294: }
295: }
296:
297: // end finally
298: return new String(baos.toByteArray());
299: }
300:
301: // end encode
302: public static String encodeString(String s,
303: boolean ignoreMaxLineLength) {
304: return encodeBytes(s.getBytes(), ignoreMaxLineLength);
305: }
306:
307: // end encodeString
308: public static void main(String[] args) {
309: String s = "P2/56wAAAgoAAAAmZGwtbW9kcHtzaWdue2RzYS1uaXN0LXNoYTF9LGRoe3Bs"
310: + "YWlufX0AAAAIM2Rlcy1jYmMAAAHIifTc7/X/swWj4OHVWX9RsUxWh4citAMwGzv6X9mUG6a"
311: + "mh5/2f6IiQ3lOeHFd5J0EAOeGNuLqE/RWJ/fFaZAzD6YTr1GZ5hflMzvRu3jbgZoLRz2TaT"
312: + "qeRs1yWrQoqANE2nBx6uDNrRahduqalLg2P/ezRCLGpqbw3HFgXmiZvzhd/rdEgZur7ZPnm"
313: + "EK7t4Ldypk/7xcK192JTbBXLDSKOEAqfYQb9CzW8MgEXde0DpMRZ9Fgm0KWPfz4CCJ0F9dd"
314: + "zcWl1nuGibL3klLKQANgecTurFlrxkBaHgxgl9nIvf24wH3nscvmD/uFOzacT/LzFaD03HFj"
315: + "/QHCiTezxVyyuJ39d3e6BBegV26vEFoGbrZ2mMf08C2MBmLmZELYdBRJ4kLpT5EZkzR8L4rT"
316: + "GxNiWkb4dGT42gHH41p2ad053lctyFWp/uQJnvJEiEm3BMURVY7k1S7zgv2FHgHE0LssXvBHx"
317: + "n/wnft0ne2NOqEXfs/Y4I39Nd7eDIupSVy/ZFfMmNPIhzKyC5lFMkjIMxPXNk548ZoP9Tnga"
318: + "4NPhHNKtcMinVvO2HT6dnIKMNb/NuXooULHIMVISpslRzXiVlTcN9vL/jhJhn9S";
319: byte[] buf = Base64.decode(s);
320: System.out.println(new String(buf).toString());
321: s = "P2/56wAAAgIAAAAmZGwtbW9kcHtzaWdue2RzYS1uaXN0LXNoYTF9LGRoe3BsYWlufX0A"
322: + "AAAEbm9uZQAAAcQAAAHAAAAAAAAABACwV9/fUska/ZHWa4YzXIPFJ4RbcFqPVV0vmyWkFekw"
323: + "wKE1mA0GVDRq9X0HTjA2DZWcQ46suVP/8mLwpnjTKNiRdFvXWGkxEpavLp+bjPa/NXsEsjZL"
324: + "aeO5iPZ11Xw5lx7uor8q/Ewwo9IcYOXzuOWN1EPCpdRv5OOaO3PCMq6QSQAAA/9j/IrSUDtf"
325: + "BLBlzPHBrzboKjIMXv9O8CIRtSqnV7GV9wllgh3Cm+Eh+rd5CB698JGQD9tMdBn4s8bj/BDL"
326: + "4qsxbQbAsZOIin6fqDKNLDxFo357eXM06I5569PgC6cuBoJXOyQTg+sLrjT8/b3/1N4TjdZN"
327: + "JiKiSiuOzkn03tNSbgAAAKDJhI2ZNNvzOXhp+VFuoY//D9GvHwAAA/9NkAROm4wF7NCPsBXd"
328: + "/+QfNV3NM/FSpOonZZDg2AVnCCGdLOXCWEj60EVHWEf5FbOjJ1KynbbdZA6q5JtVDIYuU9wH"
329: + "BCsT5iCexGD5j2HYNcUXT4VG5a6qzqloR2JizlZOcjiEM2j0/hydFUei0VYmJNY5L//AprO6"
330: + "1UJL2OGFEQAAAJ0Ts+KlcAYmJjJWODOG3mYuiTgv7A==";
331: buf = Base64.decode(s);
332: System.out.println(new String(buf).toString());
333: buf = Base64
334: .decode("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");
335: System.out.println(new String(buf).toString());
336: buf = Base64
337: .decode("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");
338: System.out.println(new String(buf).toString());
339: }
340:
341: /*
342: * ******** D E C O D I N G M E T H O D S ********
343: */
344: private static byte[] decode4to3(byte[] fourBytes) {
345: byte[] outBuff1 = new byte[3];
346: int count = decode4to3(fourBytes, 0, outBuff1, 0);
347: byte[] outBuff2 = new byte[count];
348:
349: for (int i = 0; i < count; i++) {
350: outBuff2[i] = outBuff1[i];
351: }
352:
353: return outBuff2;
354: }
355:
356: private static int decode4to3(byte[] source, int srcOffset,
357: byte[] destination, int destOffset) {
358: // Example: Dk==
359: if (source[srcOffset + 2] == EQUALS_SIGN) {
360: int outBuff = ((DECODABET[source[srcOffset]] << 24) >>> 6)
361: | ((DECODABET[source[srcOffset + 1]] << 24) >>> 12);
362: destination[destOffset] = (byte) (outBuff >>> 16);
363:
364: return 1;
365: }
366: // Example: DkL=
367: else if (source[srcOffset + 3] == EQUALS_SIGN) {
368: int outBuff = ((DECODABET[source[srcOffset]] << 24) >>> 6)
369: | ((DECODABET[source[srcOffset + 1]] << 24) >>> 12)
370: | ((DECODABET[source[srcOffset + 2]] << 24) >>> 18);
371: destination[destOffset] = (byte) (outBuff >>> 16);
372: destination[destOffset + 1] = (byte) (outBuff >>> 8);
373:
374: return 2;
375: }
376: // Example: DkLE
377: else {
378: int outBuff = ((DECODABET[source[srcOffset]] << 24) >>> 6)
379: | ((DECODABET[source[srcOffset + 1]] << 24) >>> 12)
380: | ((DECODABET[source[srcOffset + 2]] << 24) >>> 18)
381: | ((DECODABET[source[srcOffset + 3]] << 24) >>> 24);
382: destination[destOffset] = (byte) (outBuff >> 16);
383: destination[destOffset + 1] = (byte) (outBuff >> 8);
384: destination[destOffset + 2] = (byte) (outBuff);
385:
386: return 3;
387: }
388: }
389:
390: // end decodeToBytes
391:
392: /*
393: * ******** E N C O D I N G M E T H O D S ********
394: */
395: private static byte[] encode3to4(byte[] threeBytes) {
396: return encode3to4(threeBytes, 3);
397: }
398:
399: // end encodeToBytes
400: private static byte[] encode3to4(byte[] threeBytes, int numSigBytes) {
401: byte[] dest = new byte[4];
402: encode3to4(threeBytes, 0, numSigBytes, dest, 0);
403:
404: return dest;
405: }
406:
407: private static byte[] encode3to4(byte[] source, int srcOffset,
408: int numSigBytes, byte[] destination, int destOffset) {
409: // 1 2 3
410: // 01234567890123456789012345678901 Bit position
411: // --------000000001111111122222222 Array position from threeBytes
412: // --------| || || || | Six bit groups to index ALPHABET
413: // >>18 >>12 >> 6 >> 0 Right shift necessary
414: // 0x3f 0x3f 0x3f Additional AND
415: // Create buffer with zero-padding if there are only one or two
416: // significant bytes passed in the array.
417: // We have to shift left 24 in order to flush out the 1's that appear
418: // when Java treats a value as negative that is cast from a byte to an int.
419: int inBuff = ((numSigBytes > 0) ? ((source[srcOffset] << 24) >>> 8)
420: : 0)
421: | ((numSigBytes > 1) ? ((source[srcOffset + 1] << 24) >>> 16)
422: : 0)
423: | ((numSigBytes > 2) ? ((source[srcOffset + 2] << 24) >>> 24)
424: : 0);
425:
426: switch (numSigBytes) {
427: case 3:
428: destination[destOffset] = ALPHABET[(inBuff >>> 18)];
429: destination[destOffset + 1] = ALPHABET[(inBuff >>> 12) & 0x3f];
430: destination[destOffset + 2] = ALPHABET[(inBuff >>> 6) & 0x3f];
431: destination[destOffset + 3] = ALPHABET[(inBuff) & 0x3f];
432:
433: return destination;
434:
435: case 2:
436: destination[destOffset] = ALPHABET[(inBuff >>> 18)];
437: destination[destOffset + 1] = ALPHABET[(inBuff >>> 12) & 0x3f];
438: destination[destOffset + 2] = ALPHABET[(inBuff >>> 6) & 0x3f];
439: destination[destOffset + 3] = EQUALS_SIGN;
440:
441: return destination;
442:
443: case 1:
444: destination[destOffset] = ALPHABET[(inBuff >>> 18)];
445: destination[destOffset + 1] = ALPHABET[(inBuff >>> 12) & 0x3f];
446: destination[destOffset + 2] = EQUALS_SIGN;
447: destination[destOffset + 3] = EQUALS_SIGN;
448:
449: return destination;
450:
451: default:
452: return destination;
453: }
454:
455: // end switch
456: }
457:
458: // end encode3to4
459:
460: /*
461: * ******** I N N E R C L A S S I N P U T S T R E A M ********
462: */
463: public static class InputStream extends java.io.FilterInputStream {
464: private byte[] buffer;
465:
466: // Small buffer holding converted data
467: private boolean encode;
468:
469: // Encoding or decoding
470: private int bufferLength;
471:
472: // Length of buffer (3 or 4)
473: private int numSigBytes;
474:
475: // Number of meaningful bytes in the buffer
476: private int position;
477:
478: // Current position in the buffer
479: public InputStream(java.io.InputStream in) {
480: this (in, Base64.DECODE);
481: }
482:
483: // end constructor
484: public InputStream(java.io.InputStream in, boolean encode) {
485: super (in);
486: this .encode = encode;
487: this .bufferLength = encode ? 4 : 3;
488: this .buffer = new byte[bufferLength];
489: this .position = -1;
490: }
491:
492: // end constructor
493: public int read() throws java.io.IOException {
494: // Do we need to get data?
495: if (position < 0) {
496: if (encode) {
497: byte[] b3 = new byte[3];
498: numSigBytes = 0;
499:
500: for (int i = 0; i < 3; i++) {
501: try {
502: int b = in.read();
503:
504: // If end of stream, b is -1.
505: if (b >= 0) {
506: b3[i] = (byte) b;
507: numSigBytes++;
508: }
509:
510: // end if: not end of stream
511: }
512: // end try: read
513: catch (java.io.IOException e) {
514: // Only a problem if we got no data at all.
515: if (i == 0) {
516: throw e;
517: }
518: }
519:
520: // end catch
521: }
522:
523: // end for: each needed input byte
524: if (numSigBytes > 0) {
525: encode3to4(b3, 0, numSigBytes, buffer, 0);
526: position = 0;
527: }
528:
529: // end if: got data
530: }
531: // end if: encoding
532: // Else decoding
533: else {
534: byte[] b4 = new byte[4];
535: int i = 0;
536:
537: for (i = 0; i < 4; i++) {
538: int b = 0;
539:
540: do {
541: b = in.read();
542: } while ((b >= 0)
543: && (DECODABET[b & 0x7f] < white_SPACE_ENC));
544:
545: if (b < 0) {
546: break;
547:
548: // Reads a -1 if end of stream
549: }
550:
551: b4[i] = (byte) b;
552: }
553:
554: // end for: each needed input byte
555: if (i == 4) {
556: numSigBytes = decode4to3(b4, 0, buffer, 0);
557: position = 0;
558: }
559:
560: // end if: got four characters
561: }
562:
563: // end else: decode
564: }
565:
566: // end else: get data
567: // Got data?
568: if (position >= 0) {
569: // End of relevant data?
570: if (!encode && (position >= numSigBytes)) {
571: return -1;
572: }
573:
574: int b = buffer[position++];
575:
576: if (position >= bufferLength) {
577: position = -1;
578: }
579:
580: return b;
581: }
582: // end if: position >= 0
583: // Else error
584: else {
585: return -1;
586: }
587: }
588:
589: // end read
590: public int read(byte[] dest, int off, int len)
591: throws java.io.IOException {
592: int i;
593: int b;
594:
595: for (i = 0; i < len; i++) {
596: b = read();
597:
598: if (b < 0) {
599: return -1;
600: }
601:
602: dest[off + i] = (byte) b;
603: }
604:
605: // end for: each byte read
606: return i;
607: }
608:
609: // end read
610: }
611:
612: // end inner class InputStream
613:
614: /*
615: * ******** I N N E R C L A S S O U T P U T S T R E A M ********
616: */
617: public static class OutputStream extends java.io.FilterOutputStream {
618: private byte[] buffer;
619: private boolean encode;
620: private int bufferLength;
621: private int lineLength;
622: private int position;
623:
624: public OutputStream(java.io.OutputStream out) {
625: this (out, Base64.ENCODE);
626: }
627:
628: // end constructor
629: public OutputStream(java.io.OutputStream out, boolean encode) {
630: super (out);
631: this .encode = encode;
632: this .bufferLength = encode ? 3 : 4;
633: this .buffer = new byte[bufferLength];
634: this .position = 0;
635: this .lineLength = 0;
636: }
637:
638: // end constructor
639: public void close() throws java.io.IOException {
640: this .flush();
641: super .close();
642: out.close();
643: buffer = null;
644: out = null;
645: }
646:
647: // end close
648: public void flush() throws java.io.IOException {
649: if (position > 0) {
650: if (encode) {
651: out.write(Base64.encode3to4(buffer, position));
652: }
653: // end if: encoding
654: else {
655: throw new java.io.IOException(
656: "Base64 input not properly padded.");
657: }
658:
659: // end else: decoding
660: }
661:
662: // end if: buffer partially full
663: super .flush();
664: out.flush();
665: }
666:
667: // end flush
668: public void write(int theByte) throws java.io.IOException {
669: buffer[position++] = (byte) theByte;
670:
671: if (position >= bufferLength) {
672: if (encode) {
673: out.write(Base64.encode3to4(buffer, bufferLength));
674: lineLength += 4;
675:
676: if (lineLength >= MAX_LINE_LENGTH) {
677: out.write(NEW_LINE);
678: lineLength = 0;
679: }
680:
681: // end if: end o fline
682: }
683: // end if: encoding
684: else {
685: out.write(Base64.decode4to3(buffer));
686: }
687:
688: position = 0;
689: }
690:
691: // end if: convert and flush
692: }
693:
694: // end write
695: public void write(byte[] theBytes, int off, int len)
696: throws java.io.IOException {
697: for (int i = 0; i < len; i++) {
698: write(theBytes[off + i]);
699: }
700:
701: // end for: each byte written
702: }
703:
704: // end write
705: }
706:
707: // end inner class OutputStream
708: }
709:
710: // end class Base64
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