source: trip-planner-front/node_modules/node-forge/lib/des.js@ 1ad8e64

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1/**
2 * DES (Data Encryption Standard) implementation.
3 *
4 * This implementation supports DES as well as 3DES-EDE in ECB and CBC mode.
5 * It is based on the BSD-licensed implementation by Paul Tero:
6 *
7 * Paul Tero, July 2001
8 * http://www.tero.co.uk/des/
9 *
10 * Optimised for performance with large blocks by
11 * Michael Hayworth, November 2001
12 * http://www.netdealing.com
13 *
14 * THIS SOFTWARE IS PROVIDED "AS IS" AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * @author Stefan Siegl
27 * @author Dave Longley
28 *
29 * Copyright (c) 2012 Stefan Siegl <stesie@brokenpipe.de>
30 * Copyright (c) 2012-2014 Digital Bazaar, Inc.
31 */
32var forge = require('./forge');
33require('./cipher');
34require('./cipherModes');
35require('./util');
36
37/* DES API */
38module.exports = forge.des = forge.des || {};
39
40/**
41 * Deprecated. Instead, use:
42 *
43 * var cipher = forge.cipher.createCipher('DES-<mode>', key);
44 * cipher.start({iv: iv});
45 *
46 * Creates an DES cipher object to encrypt data using the given symmetric key.
47 * The output will be stored in the 'output' member of the returned cipher.
48 *
49 * The key and iv may be given as binary-encoded strings of bytes or
50 * byte buffers.
51 *
52 * @param key the symmetric key to use (64 or 192 bits).
53 * @param iv the initialization vector to use.
54 * @param output the buffer to write to, null to create one.
55 * @param mode the cipher mode to use (default: 'CBC' if IV is
56 * given, 'ECB' if null).
57 *
58 * @return the cipher.
59 */
60forge.des.startEncrypting = function(key, iv, output, mode) {
61 var cipher = _createCipher({
62 key: key,
63 output: output,
64 decrypt: false,
65 mode: mode || (iv === null ? 'ECB' : 'CBC')
66 });
67 cipher.start(iv);
68 return cipher;
69};
70
71/**
72 * Deprecated. Instead, use:
73 *
74 * var cipher = forge.cipher.createCipher('DES-<mode>', key);
75 *
76 * Creates an DES cipher object to encrypt data using the given symmetric key.
77 *
78 * The key may be given as a binary-encoded string of bytes or a byte buffer.
79 *
80 * @param key the symmetric key to use (64 or 192 bits).
81 * @param mode the cipher mode to use (default: 'CBC').
82 *
83 * @return the cipher.
84 */
85forge.des.createEncryptionCipher = function(key, mode) {
86 return _createCipher({
87 key: key,
88 output: null,
89 decrypt: false,
90 mode: mode
91 });
92};
93
94/**
95 * Deprecated. Instead, use:
96 *
97 * var decipher = forge.cipher.createDecipher('DES-<mode>', key);
98 * decipher.start({iv: iv});
99 *
100 * Creates an DES cipher object to decrypt data using the given symmetric key.
101 * The output will be stored in the 'output' member of the returned cipher.
102 *
103 * The key and iv may be given as binary-encoded strings of bytes or
104 * byte buffers.
105 *
106 * @param key the symmetric key to use (64 or 192 bits).
107 * @param iv the initialization vector to use.
108 * @param output the buffer to write to, null to create one.
109 * @param mode the cipher mode to use (default: 'CBC' if IV is
110 * given, 'ECB' if null).
111 *
112 * @return the cipher.
113 */
114forge.des.startDecrypting = function(key, iv, output, mode) {
115 var cipher = _createCipher({
116 key: key,
117 output: output,
118 decrypt: true,
119 mode: mode || (iv === null ? 'ECB' : 'CBC')
120 });
121 cipher.start(iv);
122 return cipher;
123};
124
125/**
126 * Deprecated. Instead, use:
127 *
128 * var decipher = forge.cipher.createDecipher('DES-<mode>', key);
129 *
130 * Creates an DES cipher object to decrypt data using the given symmetric key.
131 *
132 * The key may be given as a binary-encoded string of bytes or a byte buffer.
133 *
134 * @param key the symmetric key to use (64 or 192 bits).
135 * @param mode the cipher mode to use (default: 'CBC').
136 *
137 * @return the cipher.
138 */
139forge.des.createDecryptionCipher = function(key, mode) {
140 return _createCipher({
141 key: key,
142 output: null,
143 decrypt: true,
144 mode: mode
145 });
146};
147
148/**
149 * Creates a new DES cipher algorithm object.
150 *
151 * @param name the name of the algorithm.
152 * @param mode the mode factory function.
153 *
154 * @return the DES algorithm object.
155 */
156forge.des.Algorithm = function(name, mode) {
157 var self = this;
158 self.name = name;
159 self.mode = new mode({
160 blockSize: 8,
161 cipher: {
162 encrypt: function(inBlock, outBlock) {
163 return _updateBlock(self._keys, inBlock, outBlock, false);
164 },
165 decrypt: function(inBlock, outBlock) {
166 return _updateBlock(self._keys, inBlock, outBlock, true);
167 }
168 }
169 });
170 self._init = false;
171};
172
173/**
174 * Initializes this DES algorithm by expanding its key.
175 *
176 * @param options the options to use.
177 * key the key to use with this algorithm.
178 * decrypt true if the algorithm should be initialized for decryption,
179 * false for encryption.
180 */
181forge.des.Algorithm.prototype.initialize = function(options) {
182 if(this._init) {
183 return;
184 }
185
186 var key = forge.util.createBuffer(options.key);
187 if(this.name.indexOf('3DES') === 0) {
188 if(key.length() !== 24) {
189 throw new Error('Invalid Triple-DES key size: ' + key.length() * 8);
190 }
191 }
192
193 // do key expansion to 16 or 48 subkeys (single or triple DES)
194 this._keys = _createKeys(key);
195 this._init = true;
196};
197
198/** Register DES algorithms **/
199
200registerAlgorithm('DES-ECB', forge.cipher.modes.ecb);
201registerAlgorithm('DES-CBC', forge.cipher.modes.cbc);
202registerAlgorithm('DES-CFB', forge.cipher.modes.cfb);
203registerAlgorithm('DES-OFB', forge.cipher.modes.ofb);
204registerAlgorithm('DES-CTR', forge.cipher.modes.ctr);
205
206registerAlgorithm('3DES-ECB', forge.cipher.modes.ecb);
207registerAlgorithm('3DES-CBC', forge.cipher.modes.cbc);
208registerAlgorithm('3DES-CFB', forge.cipher.modes.cfb);
209registerAlgorithm('3DES-OFB', forge.cipher.modes.ofb);
210registerAlgorithm('3DES-CTR', forge.cipher.modes.ctr);
211
212function registerAlgorithm(name, mode) {
213 var factory = function() {
214 return new forge.des.Algorithm(name, mode);
215 };
216 forge.cipher.registerAlgorithm(name, factory);
217}
218
219/** DES implementation **/
220
221var spfunction1 = [0x1010400,0,0x10000,0x1010404,0x1010004,0x10404,0x4,0x10000,0x400,0x1010400,0x1010404,0x400,0x1000404,0x1010004,0x1000000,0x4,0x404,0x1000400,0x1000400,0x10400,0x10400,0x1010000,0x1010000,0x1000404,0x10004,0x1000004,0x1000004,0x10004,0,0x404,0x10404,0x1000000,0x10000,0x1010404,0x4,0x1010000,0x1010400,0x1000000,0x1000000,0x400,0x1010004,0x10000,0x10400,0x1000004,0x400,0x4,0x1000404,0x10404,0x1010404,0x10004,0x1010000,0x1000404,0x1000004,0x404,0x10404,0x1010400,0x404,0x1000400,0x1000400,0,0x10004,0x10400,0,0x1010004];
222var spfunction2 = [-0x7fef7fe0,-0x7fff8000,0x8000,0x108020,0x100000,0x20,-0x7fefffe0,-0x7fff7fe0,-0x7fffffe0,-0x7fef7fe0,-0x7fef8000,-0x80000000,-0x7fff8000,0x100000,0x20,-0x7fefffe0,0x108000,0x100020,-0x7fff7fe0,0,-0x80000000,0x8000,0x108020,-0x7ff00000,0x100020,-0x7fffffe0,0,0x108000,0x8020,-0x7fef8000,-0x7ff00000,0x8020,0,0x108020,-0x7fefffe0,0x100000,-0x7fff7fe0,-0x7ff00000,-0x7fef8000,0x8000,-0x7ff00000,-0x7fff8000,0x20,-0x7fef7fe0,0x108020,0x20,0x8000,-0x80000000,0x8020,-0x7fef8000,0x100000,-0x7fffffe0,0x100020,-0x7fff7fe0,-0x7fffffe0,0x100020,0x108000,0,-0x7fff8000,0x8020,-0x80000000,-0x7fefffe0,-0x7fef7fe0,0x108000];
223var spfunction3 = [0x208,0x8020200,0,0x8020008,0x8000200,0,0x20208,0x8000200,0x20008,0x8000008,0x8000008,0x20000,0x8020208,0x20008,0x8020000,0x208,0x8000000,0x8,0x8020200,0x200,0x20200,0x8020000,0x8020008,0x20208,0x8000208,0x20200,0x20000,0x8000208,0x8,0x8020208,0x200,0x8000000,0x8020200,0x8000000,0x20008,0x208,0x20000,0x8020200,0x8000200,0,0x200,0x20008,0x8020208,0x8000200,0x8000008,0x200,0,0x8020008,0x8000208,0x20000,0x8000000,0x8020208,0x8,0x20208,0x20200,0x8000008,0x8020000,0x8000208,0x208,0x8020000,0x20208,0x8,0x8020008,0x20200];
224var spfunction4 = [0x802001,0x2081,0x2081,0x80,0x802080,0x800081,0x800001,0x2001,0,0x802000,0x802000,0x802081,0x81,0,0x800080,0x800001,0x1,0x2000,0x800000,0x802001,0x80,0x800000,0x2001,0x2080,0x800081,0x1,0x2080,0x800080,0x2000,0x802080,0x802081,0x81,0x800080,0x800001,0x802000,0x802081,0x81,0,0,0x802000,0x2080,0x800080,0x800081,0x1,0x802001,0x2081,0x2081,0x80,0x802081,0x81,0x1,0x2000,0x800001,0x2001,0x802080,0x800081,0x2001,0x2080,0x800000,0x802001,0x80,0x800000,0x2000,0x802080];
225var spfunction5 = [0x100,0x2080100,0x2080000,0x42000100,0x80000,0x100,0x40000000,0x2080000,0x40080100,0x80000,0x2000100,0x40080100,0x42000100,0x42080000,0x80100,0x40000000,0x2000000,0x40080000,0x40080000,0,0x40000100,0x42080100,0x42080100,0x2000100,0x42080000,0x40000100,0,0x42000000,0x2080100,0x2000000,0x42000000,0x80100,0x80000,0x42000100,0x100,0x2000000,0x40000000,0x2080000,0x42000100,0x40080100,0x2000100,0x40000000,0x42080000,0x2080100,0x40080100,0x100,0x2000000,0x42080000,0x42080100,0x80100,0x42000000,0x42080100,0x2080000,0,0x40080000,0x42000000,0x80100,0x2000100,0x40000100,0x80000,0,0x40080000,0x2080100,0x40000100];
226var spfunction6 = [0x20000010,0x20400000,0x4000,0x20404010,0x20400000,0x10,0x20404010,0x400000,0x20004000,0x404010,0x400000,0x20000010,0x400010,0x20004000,0x20000000,0x4010,0,0x400010,0x20004010,0x4000,0x404000,0x20004010,0x10,0x20400010,0x20400010,0,0x404010,0x20404000,0x4010,0x404000,0x20404000,0x20000000,0x20004000,0x10,0x20400010,0x404000,0x20404010,0x400000,0x4010,0x20000010,0x400000,0x20004000,0x20000000,0x4010,0x20000010,0x20404010,0x404000,0x20400000,0x404010,0x20404000,0,0x20400010,0x10,0x4000,0x20400000,0x404010,0x4000,0x400010,0x20004010,0,0x20404000,0x20000000,0x400010,0x20004010];
227var spfunction7 = [0x200000,0x4200002,0x4000802,0,0x800,0x4000802,0x200802,0x4200800,0x4200802,0x200000,0,0x4000002,0x2,0x4000000,0x4200002,0x802,0x4000800,0x200802,0x200002,0x4000800,0x4000002,0x4200000,0x4200800,0x200002,0x4200000,0x800,0x802,0x4200802,0x200800,0x2,0x4000000,0x200800,0x4000000,0x200800,0x200000,0x4000802,0x4000802,0x4200002,0x4200002,0x2,0x200002,0x4000000,0x4000800,0x200000,0x4200800,0x802,0x200802,0x4200800,0x802,0x4000002,0x4200802,0x4200000,0x200800,0,0x2,0x4200802,0,0x200802,0x4200000,0x800,0x4000002,0x4000800,0x800,0x200002];
228var spfunction8 = [0x10001040,0x1000,0x40000,0x10041040,0x10000000,0x10001040,0x40,0x10000000,0x40040,0x10040000,0x10041040,0x41000,0x10041000,0x41040,0x1000,0x40,0x10040000,0x10000040,0x10001000,0x1040,0x41000,0x40040,0x10040040,0x10041000,0x1040,0,0,0x10040040,0x10000040,0x10001000,0x41040,0x40000,0x41040,0x40000,0x10041000,0x1000,0x40,0x10040040,0x1000,0x41040,0x10001000,0x40,0x10000040,0x10040000,0x10040040,0x10000000,0x40000,0x10001040,0,0x10041040,0x40040,0x10000040,0x10040000,0x10001000,0x10001040,0,0x10041040,0x41000,0x41000,0x1040,0x1040,0x40040,0x10000000,0x10041000];
229
230/**
231 * Create necessary sub keys.
232 *
233 * @param key the 64-bit or 192-bit key.
234 *
235 * @return the expanded keys.
236 */
237function _createKeys(key) {
238 var pc2bytes0 = [0,0x4,0x20000000,0x20000004,0x10000,0x10004,0x20010000,0x20010004,0x200,0x204,0x20000200,0x20000204,0x10200,0x10204,0x20010200,0x20010204],
239 pc2bytes1 = [0,0x1,0x100000,0x100001,0x4000000,0x4000001,0x4100000,0x4100001,0x100,0x101,0x100100,0x100101,0x4000100,0x4000101,0x4100100,0x4100101],
240 pc2bytes2 = [0,0x8,0x800,0x808,0x1000000,0x1000008,0x1000800,0x1000808,0,0x8,0x800,0x808,0x1000000,0x1000008,0x1000800,0x1000808],
241 pc2bytes3 = [0,0x200000,0x8000000,0x8200000,0x2000,0x202000,0x8002000,0x8202000,0x20000,0x220000,0x8020000,0x8220000,0x22000,0x222000,0x8022000,0x8222000],
242 pc2bytes4 = [0,0x40000,0x10,0x40010,0,0x40000,0x10,0x40010,0x1000,0x41000,0x1010,0x41010,0x1000,0x41000,0x1010,0x41010],
243 pc2bytes5 = [0,0x400,0x20,0x420,0,0x400,0x20,0x420,0x2000000,0x2000400,0x2000020,0x2000420,0x2000000,0x2000400,0x2000020,0x2000420],
244 pc2bytes6 = [0,0x10000000,0x80000,0x10080000,0x2,0x10000002,0x80002,0x10080002,0,0x10000000,0x80000,0x10080000,0x2,0x10000002,0x80002,0x10080002],
245 pc2bytes7 = [0,0x10000,0x800,0x10800,0x20000000,0x20010000,0x20000800,0x20010800,0x20000,0x30000,0x20800,0x30800,0x20020000,0x20030000,0x20020800,0x20030800],
246 pc2bytes8 = [0,0x40000,0,0x40000,0x2,0x40002,0x2,0x40002,0x2000000,0x2040000,0x2000000,0x2040000,0x2000002,0x2040002,0x2000002,0x2040002],
247 pc2bytes9 = [0,0x10000000,0x8,0x10000008,0,0x10000000,0x8,0x10000008,0x400,0x10000400,0x408,0x10000408,0x400,0x10000400,0x408,0x10000408],
248 pc2bytes10 = [0,0x20,0,0x20,0x100000,0x100020,0x100000,0x100020,0x2000,0x2020,0x2000,0x2020,0x102000,0x102020,0x102000,0x102020],
249 pc2bytes11 = [0,0x1000000,0x200,0x1000200,0x200000,0x1200000,0x200200,0x1200200,0x4000000,0x5000000,0x4000200,0x5000200,0x4200000,0x5200000,0x4200200,0x5200200],
250 pc2bytes12 = [0,0x1000,0x8000000,0x8001000,0x80000,0x81000,0x8080000,0x8081000,0x10,0x1010,0x8000010,0x8001010,0x80010,0x81010,0x8080010,0x8081010],
251 pc2bytes13 = [0,0x4,0x100,0x104,0,0x4,0x100,0x104,0x1,0x5,0x101,0x105,0x1,0x5,0x101,0x105];
252
253 // how many iterations (1 for des, 3 for triple des)
254 // changed by Paul 16/6/2007 to use Triple DES for 9+ byte keys
255 var iterations = key.length() > 8 ? 3 : 1;
256
257 // stores the return keys
258 var keys = [];
259
260 // now define the left shifts which need to be done
261 var shifts = [0, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0];
262
263 var n = 0, tmp;
264 for(var j = 0; j < iterations; j++) {
265 var left = key.getInt32();
266 var right = key.getInt32();
267
268 tmp = ((left >>> 4) ^ right) & 0x0f0f0f0f;
269 right ^= tmp;
270 left ^= (tmp << 4);
271
272 tmp = ((right >>> -16) ^ left) & 0x0000ffff;
273 left ^= tmp;
274 right ^= (tmp << -16);
275
276 tmp = ((left >>> 2) ^ right) & 0x33333333;
277 right ^= tmp;
278 left ^= (tmp << 2);
279
280 tmp = ((right >>> -16) ^ left) & 0x0000ffff;
281 left ^= tmp;
282 right ^= (tmp << -16);
283
284 tmp = ((left >>> 1) ^ right) & 0x55555555;
285 right ^= tmp;
286 left ^= (tmp << 1);
287
288 tmp = ((right >>> 8) ^ left) & 0x00ff00ff;
289 left ^= tmp;
290 right ^= (tmp << 8);
291
292 tmp = ((left >>> 1) ^ right) & 0x55555555;
293 right ^= tmp;
294 left ^= (tmp << 1);
295
296 // right needs to be shifted and OR'd with last four bits of left
297 tmp = (left << 8) | ((right >>> 20) & 0x000000f0);
298
299 // left needs to be put upside down
300 left = ((right << 24) | ((right << 8) & 0xff0000) |
301 ((right >>> 8) & 0xff00) | ((right >>> 24) & 0xf0));
302 right = tmp;
303
304 // now go through and perform these shifts on the left and right keys
305 for(var i = 0; i < shifts.length; ++i) {
306 //shift the keys either one or two bits to the left
307 if(shifts[i]) {
308 left = (left << 2) | (left >>> 26);
309 right = (right << 2) | (right >>> 26);
310 } else {
311 left = (left << 1) | (left >>> 27);
312 right = (right << 1) | (right >>> 27);
313 }
314 left &= -0xf;
315 right &= -0xf;
316
317 // now apply PC-2, in such a way that E is easier when encrypting or
318 // decrypting this conversion will look like PC-2 except only the last 6
319 // bits of each byte are used rather than 48 consecutive bits and the
320 // order of lines will be according to how the S selection functions will
321 // be applied: S2, S4, S6, S8, S1, S3, S5, S7
322 var lefttmp = (
323 pc2bytes0[left >>> 28] | pc2bytes1[(left >>> 24) & 0xf] |
324 pc2bytes2[(left >>> 20) & 0xf] | pc2bytes3[(left >>> 16) & 0xf] |
325 pc2bytes4[(left >>> 12) & 0xf] | pc2bytes5[(left >>> 8) & 0xf] |
326 pc2bytes6[(left >>> 4) & 0xf]);
327 var righttmp = (
328 pc2bytes7[right >>> 28] | pc2bytes8[(right >>> 24) & 0xf] |
329 pc2bytes9[(right >>> 20) & 0xf] | pc2bytes10[(right >>> 16) & 0xf] |
330 pc2bytes11[(right >>> 12) & 0xf] | pc2bytes12[(right >>> 8) & 0xf] |
331 pc2bytes13[(right >>> 4) & 0xf]);
332 tmp = ((righttmp >>> 16) ^ lefttmp) & 0x0000ffff;
333 keys[n++] = lefttmp ^ tmp;
334 keys[n++] = righttmp ^ (tmp << 16);
335 }
336 }
337
338 return keys;
339}
340
341/**
342 * Updates a single block (1 byte) using DES. The update will either
343 * encrypt or decrypt the block.
344 *
345 * @param keys the expanded keys.
346 * @param input the input block (an array of 32-bit words).
347 * @param output the updated output block.
348 * @param decrypt true to decrypt the block, false to encrypt it.
349 */
350function _updateBlock(keys, input, output, decrypt) {
351 // set up loops for single or triple DES
352 var iterations = keys.length === 32 ? 3 : 9;
353 var looping;
354 if(iterations === 3) {
355 looping = decrypt ? [30, -2, -2] : [0, 32, 2];
356 } else {
357 looping = (decrypt ?
358 [94, 62, -2, 32, 64, 2, 30, -2, -2] :
359 [0, 32, 2, 62, 30, -2, 64, 96, 2]);
360 }
361
362 var tmp;
363
364 var left = input[0];
365 var right = input[1];
366
367 // first each 64 bit chunk of the message must be permuted according to IP
368 tmp = ((left >>> 4) ^ right) & 0x0f0f0f0f;
369 right ^= tmp;
370 left ^= (tmp << 4);
371
372 tmp = ((left >>> 16) ^ right) & 0x0000ffff;
373 right ^= tmp;
374 left ^= (tmp << 16);
375
376 tmp = ((right >>> 2) ^ left) & 0x33333333;
377 left ^= tmp;
378 right ^= (tmp << 2);
379
380 tmp = ((right >>> 8) ^ left) & 0x00ff00ff;
381 left ^= tmp;
382 right ^= (tmp << 8);
383
384 tmp = ((left >>> 1) ^ right) & 0x55555555;
385 right ^= tmp;
386 left ^= (tmp << 1);
387
388 // rotate left 1 bit
389 left = ((left << 1) | (left >>> 31));
390 right = ((right << 1) | (right >>> 31));
391
392 for(var j = 0; j < iterations; j += 3) {
393 var endloop = looping[j + 1];
394 var loopinc = looping[j + 2];
395
396 // now go through and perform the encryption or decryption
397 for(var i = looping[j]; i != endloop; i += loopinc) {
398 var right1 = right ^ keys[i];
399 var right2 = ((right >>> 4) | (right << 28)) ^ keys[i + 1];
400
401 // passing these bytes through the S selection functions
402 tmp = left;
403 left = right;
404 right = tmp ^ (
405 spfunction2[(right1 >>> 24) & 0x3f] |
406 spfunction4[(right1 >>> 16) & 0x3f] |
407 spfunction6[(right1 >>> 8) & 0x3f] |
408 spfunction8[right1 & 0x3f] |
409 spfunction1[(right2 >>> 24) & 0x3f] |
410 spfunction3[(right2 >>> 16) & 0x3f] |
411 spfunction5[(right2 >>> 8) & 0x3f] |
412 spfunction7[right2 & 0x3f]);
413 }
414 // unreverse left and right
415 tmp = left;
416 left = right;
417 right = tmp;
418 }
419
420 // rotate right 1 bit
421 left = ((left >>> 1) | (left << 31));
422 right = ((right >>> 1) | (right << 31));
423
424 // now perform IP-1, which is IP in the opposite direction
425 tmp = ((left >>> 1) ^ right) & 0x55555555;
426 right ^= tmp;
427 left ^= (tmp << 1);
428
429 tmp = ((right >>> 8) ^ left) & 0x00ff00ff;
430 left ^= tmp;
431 right ^= (tmp << 8);
432
433 tmp = ((right >>> 2) ^ left) & 0x33333333;
434 left ^= tmp;
435 right ^= (tmp << 2);
436
437 tmp = ((left >>> 16) ^ right) & 0x0000ffff;
438 right ^= tmp;
439 left ^= (tmp << 16);
440
441 tmp = ((left >>> 4) ^ right) & 0x0f0f0f0f;
442 right ^= tmp;
443 left ^= (tmp << 4);
444
445 output[0] = left;
446 output[1] = right;
447}
448
449/**
450 * Deprecated. Instead, use:
451 *
452 * forge.cipher.createCipher('DES-<mode>', key);
453 * forge.cipher.createDecipher('DES-<mode>', key);
454 *
455 * Creates a deprecated DES cipher object. This object's mode will default to
456 * CBC (cipher-block-chaining).
457 *
458 * The key may be given as a binary-encoded string of bytes or a byte buffer.
459 *
460 * @param options the options to use.
461 * key the symmetric key to use (64 or 192 bits).
462 * output the buffer to write to.
463 * decrypt true for decryption, false for encryption.
464 * mode the cipher mode to use (default: 'CBC').
465 *
466 * @return the cipher.
467 */
468function _createCipher(options) {
469 options = options || {};
470 var mode = (options.mode || 'CBC').toUpperCase();
471 var algorithm = 'DES-' + mode;
472
473 var cipher;
474 if(options.decrypt) {
475 cipher = forge.cipher.createDecipher(algorithm, options.key);
476 } else {
477 cipher = forge.cipher.createCipher(algorithm, options.key);
478 }
479
480 // backwards compatible start API
481 var start = cipher.start;
482 cipher.start = function(iv, options) {
483 // backwards compatibility: support second arg as output buffer
484 var output = null;
485 if(options instanceof forge.util.ByteBuffer) {
486 output = options;
487 options = {};
488 }
489 options = options || {};
490 options.output = output;
491 options.iv = iv;
492 start.call(cipher, options);
493 };
494
495 return cipher;
496}
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