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496 lines
20 KiB
496 lines
20 KiB
/** |
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* DES (Data Encryption Standard) implementation. |
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* |
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* This implementation supports DES as well as 3DES-EDE in ECB and CBC mode. |
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* It is based on the BSD-licensed implementation by Paul Tero: |
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* |
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* Paul Tero, July 2001 |
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* http://www.tero.co.uk/des/ |
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* |
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* Optimised for performance with large blocks by |
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* Michael Hayworth, November 2001 |
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* http://www.netdealing.com |
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* |
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* THIS SOFTWARE IS PROVIDED "AS IS" AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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* |
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* @author Stefan Siegl |
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* @author Dave Longley |
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* |
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* Copyright (c) 2012 Stefan Siegl <stesie@brokenpipe.de> |
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* Copyright (c) 2012-2014 Digital Bazaar, Inc. |
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*/ |
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var forge = require('./forge'); |
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require('./cipher'); |
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require('./cipherModes'); |
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require('./util'); |
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|
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/* DES API */ |
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module.exports = forge.des = forge.des || {}; |
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|
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/** |
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* Deprecated. Instead, use: |
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* |
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* var cipher = forge.cipher.createCipher('DES-<mode>', key); |
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* cipher.start({iv: iv}); |
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* |
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* Creates an DES cipher object to encrypt data using the given symmetric key. |
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* The output will be stored in the 'output' member of the returned cipher. |
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* |
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* The key and iv may be given as binary-encoded strings of bytes or |
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* byte buffers. |
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* |
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* @param key the symmetric key to use (64 or 192 bits). |
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* @param iv the initialization vector to use. |
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* @param output the buffer to write to, null to create one. |
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* @param mode the cipher mode to use (default: 'CBC' if IV is |
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* given, 'ECB' if null). |
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* |
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* @return the cipher. |
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*/ |
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forge.des.startEncrypting = function(key, iv, output, mode) { |
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var cipher = _createCipher({ |
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key: key, |
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output: output, |
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decrypt: false, |
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mode: mode || (iv === null ? 'ECB' : 'CBC') |
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}); |
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cipher.start(iv); |
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return cipher; |
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}; |
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|
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/** |
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* Deprecated. Instead, use: |
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* |
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* var cipher = forge.cipher.createCipher('DES-<mode>', key); |
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* |
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* Creates an DES cipher object to encrypt data using the given symmetric key. |
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* |
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* The key may be given as a binary-encoded string of bytes or a byte buffer. |
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* |
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* @param key the symmetric key to use (64 or 192 bits). |
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* @param mode the cipher mode to use (default: 'CBC'). |
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* |
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* @return the cipher. |
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*/ |
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forge.des.createEncryptionCipher = function(key, mode) { |
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return _createCipher({ |
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key: key, |
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output: null, |
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decrypt: false, |
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mode: mode |
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}); |
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}; |
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|
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/** |
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* Deprecated. Instead, use: |
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* |
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* var decipher = forge.cipher.createDecipher('DES-<mode>', key); |
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* decipher.start({iv: iv}); |
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* |
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* Creates an DES cipher object to decrypt data using the given symmetric key. |
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* The output will be stored in the 'output' member of the returned cipher. |
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* |
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* The key and iv may be given as binary-encoded strings of bytes or |
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* byte buffers. |
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* |
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* @param key the symmetric key to use (64 or 192 bits). |
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* @param iv the initialization vector to use. |
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* @param output the buffer to write to, null to create one. |
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* @param mode the cipher mode to use (default: 'CBC' if IV is |
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* given, 'ECB' if null). |
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* |
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* @return the cipher. |
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*/ |
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forge.des.startDecrypting = function(key, iv, output, mode) { |
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var cipher = _createCipher({ |
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key: key, |
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output: output, |
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decrypt: true, |
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mode: mode || (iv === null ? 'ECB' : 'CBC') |
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}); |
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cipher.start(iv); |
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return cipher; |
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}; |
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|
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/** |
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* Deprecated. Instead, use: |
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* |
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* var decipher = forge.cipher.createDecipher('DES-<mode>', key); |
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* |
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* Creates an DES cipher object to decrypt data using the given symmetric key. |
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* |
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* The key may be given as a binary-encoded string of bytes or a byte buffer. |
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* |
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* @param key the symmetric key to use (64 or 192 bits). |
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* @param mode the cipher mode to use (default: 'CBC'). |
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* |
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* @return the cipher. |
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*/ |
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forge.des.createDecryptionCipher = function(key, mode) { |
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return _createCipher({ |
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key: key, |
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output: null, |
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decrypt: true, |
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mode: mode |
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}); |
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}; |
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/** |
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* Creates a new DES cipher algorithm object. |
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* |
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* @param name the name of the algorithm. |
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* @param mode the mode factory function. |
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* |
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* @return the DES algorithm object. |
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*/ |
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forge.des.Algorithm = function(name, mode) { |
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var self = this; |
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self.name = name; |
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self.mode = new mode({ |
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blockSize: 8, |
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cipher: { |
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encrypt: function(inBlock, outBlock) { |
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return _updateBlock(self._keys, inBlock, outBlock, false); |
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}, |
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decrypt: function(inBlock, outBlock) { |
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return _updateBlock(self._keys, inBlock, outBlock, true); |
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} |
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} |
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}); |
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self._init = false; |
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}; |
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/** |
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* Initializes this DES algorithm by expanding its key. |
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* |
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* @param options the options to use. |
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* key the key to use with this algorithm. |
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* decrypt true if the algorithm should be initialized for decryption, |
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* false for encryption. |
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*/ |
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forge.des.Algorithm.prototype.initialize = function(options) { |
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if(this._init) { |
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return; |
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} |
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var key = forge.util.createBuffer(options.key); |
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if(this.name.indexOf('3DES') === 0) { |
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if(key.length() !== 24) { |
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throw new Error('Invalid Triple-DES key size: ' + key.length() * 8); |
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} |
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} |
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// do key expansion to 16 or 48 subkeys (single or triple DES) |
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this._keys = _createKeys(key); |
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this._init = true; |
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}; |
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/** Register DES algorithms **/ |
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registerAlgorithm('DES-ECB', forge.cipher.modes.ecb); |
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registerAlgorithm('DES-CBC', forge.cipher.modes.cbc); |
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registerAlgorithm('DES-CFB', forge.cipher.modes.cfb); |
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registerAlgorithm('DES-OFB', forge.cipher.modes.ofb); |
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registerAlgorithm('DES-CTR', forge.cipher.modes.ctr); |
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registerAlgorithm('3DES-ECB', forge.cipher.modes.ecb); |
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registerAlgorithm('3DES-CBC', forge.cipher.modes.cbc); |
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registerAlgorithm('3DES-CFB', forge.cipher.modes.cfb); |
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registerAlgorithm('3DES-OFB', forge.cipher.modes.ofb); |
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registerAlgorithm('3DES-CTR', forge.cipher.modes.ctr); |
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function registerAlgorithm(name, mode) { |
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var factory = function() { |
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return new forge.des.Algorithm(name, mode); |
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}; |
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forge.cipher.registerAlgorithm(name, factory); |
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} |
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|
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/** DES implementation **/ |
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|
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var 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]; |
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var 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]; |
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var 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]; |
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var 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]; |
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var 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]; |
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var 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]; |
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var 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]; |
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var 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]; |
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|
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/** |
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* Create necessary sub keys. |
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* |
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* @param key the 64-bit or 192-bit key. |
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* |
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* @return the expanded keys. |
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*/ |
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function _createKeys(key) { |
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var pc2bytes0 = [0,0x4,0x20000000,0x20000004,0x10000,0x10004,0x20010000,0x20010004,0x200,0x204,0x20000200,0x20000204,0x10200,0x10204,0x20010200,0x20010204], |
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pc2bytes1 = [0,0x1,0x100000,0x100001,0x4000000,0x4000001,0x4100000,0x4100001,0x100,0x101,0x100100,0x100101,0x4000100,0x4000101,0x4100100,0x4100101], |
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pc2bytes2 = [0,0x8,0x800,0x808,0x1000000,0x1000008,0x1000800,0x1000808,0,0x8,0x800,0x808,0x1000000,0x1000008,0x1000800,0x1000808], |
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pc2bytes3 = [0,0x200000,0x8000000,0x8200000,0x2000,0x202000,0x8002000,0x8202000,0x20000,0x220000,0x8020000,0x8220000,0x22000,0x222000,0x8022000,0x8222000], |
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pc2bytes4 = [0,0x40000,0x10,0x40010,0,0x40000,0x10,0x40010,0x1000,0x41000,0x1010,0x41010,0x1000,0x41000,0x1010,0x41010], |
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pc2bytes5 = [0,0x400,0x20,0x420,0,0x400,0x20,0x420,0x2000000,0x2000400,0x2000020,0x2000420,0x2000000,0x2000400,0x2000020,0x2000420], |
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pc2bytes6 = [0,0x10000000,0x80000,0x10080000,0x2,0x10000002,0x80002,0x10080002,0,0x10000000,0x80000,0x10080000,0x2,0x10000002,0x80002,0x10080002], |
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pc2bytes7 = [0,0x10000,0x800,0x10800,0x20000000,0x20010000,0x20000800,0x20010800,0x20000,0x30000,0x20800,0x30800,0x20020000,0x20030000,0x20020800,0x20030800], |
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pc2bytes8 = [0,0x40000,0,0x40000,0x2,0x40002,0x2,0x40002,0x2000000,0x2040000,0x2000000,0x2040000,0x2000002,0x2040002,0x2000002,0x2040002], |
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pc2bytes9 = [0,0x10000000,0x8,0x10000008,0,0x10000000,0x8,0x10000008,0x400,0x10000400,0x408,0x10000408,0x400,0x10000400,0x408,0x10000408], |
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pc2bytes10 = [0,0x20,0,0x20,0x100000,0x100020,0x100000,0x100020,0x2000,0x2020,0x2000,0x2020,0x102000,0x102020,0x102000,0x102020], |
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pc2bytes11 = [0,0x1000000,0x200,0x1000200,0x200000,0x1200000,0x200200,0x1200200,0x4000000,0x5000000,0x4000200,0x5000200,0x4200000,0x5200000,0x4200200,0x5200200], |
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pc2bytes12 = [0,0x1000,0x8000000,0x8001000,0x80000,0x81000,0x8080000,0x8081000,0x10,0x1010,0x8000010,0x8001010,0x80010,0x81010,0x8080010,0x8081010], |
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pc2bytes13 = [0,0x4,0x100,0x104,0,0x4,0x100,0x104,0x1,0x5,0x101,0x105,0x1,0x5,0x101,0x105]; |
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|
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// how many iterations (1 for des, 3 for triple des) |
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// changed by Paul 16/6/2007 to use Triple DES for 9+ byte keys |
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var iterations = key.length() > 8 ? 3 : 1; |
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|
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// stores the return keys |
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var keys = []; |
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|
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// now define the left shifts which need to be done |
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var shifts = [0, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0]; |
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|
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var n = 0, tmp; |
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for(var j = 0; j < iterations; j++) { |
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var left = key.getInt32(); |
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var right = key.getInt32(); |
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|
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tmp = ((left >>> 4) ^ right) & 0x0f0f0f0f; |
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right ^= tmp; |
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left ^= (tmp << 4); |
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|
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tmp = ((right >>> -16) ^ left) & 0x0000ffff; |
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left ^= tmp; |
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right ^= (tmp << -16); |
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|
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tmp = ((left >>> 2) ^ right) & 0x33333333; |
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right ^= tmp; |
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left ^= (tmp << 2); |
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|
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tmp = ((right >>> -16) ^ left) & 0x0000ffff; |
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left ^= tmp; |
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right ^= (tmp << -16); |
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|
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tmp = ((left >>> 1) ^ right) & 0x55555555; |
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right ^= tmp; |
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left ^= (tmp << 1); |
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|
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tmp = ((right >>> 8) ^ left) & 0x00ff00ff; |
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left ^= tmp; |
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right ^= (tmp << 8); |
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|
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tmp = ((left >>> 1) ^ right) & 0x55555555; |
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right ^= tmp; |
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left ^= (tmp << 1); |
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|
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// right needs to be shifted and OR'd with last four bits of left |
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tmp = (left << 8) | ((right >>> 20) & 0x000000f0); |
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|
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// left needs to be put upside down |
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left = ((right << 24) | ((right << 8) & 0xff0000) | |
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((right >>> 8) & 0xff00) | ((right >>> 24) & 0xf0)); |
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right = tmp; |
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|
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// now go through and perform these shifts on the left and right keys |
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for(var i = 0; i < shifts.length; ++i) { |
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//shift the keys either one or two bits to the left |
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if(shifts[i]) { |
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left = (left << 2) | (left >>> 26); |
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right = (right << 2) | (right >>> 26); |
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} else { |
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left = (left << 1) | (left >>> 27); |
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right = (right << 1) | (right >>> 27); |
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} |
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left &= -0xf; |
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right &= -0xf; |
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|
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// now apply PC-2, in such a way that E is easier when encrypting or |
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// decrypting this conversion will look like PC-2 except only the last 6 |
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// bits of each byte are used rather than 48 consecutive bits and the |
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// order of lines will be according to how the S selection functions will |
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// be applied: S2, S4, S6, S8, S1, S3, S5, S7 |
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var lefttmp = ( |
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pc2bytes0[left >>> 28] | pc2bytes1[(left >>> 24) & 0xf] | |
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pc2bytes2[(left >>> 20) & 0xf] | pc2bytes3[(left >>> 16) & 0xf] | |
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pc2bytes4[(left >>> 12) & 0xf] | pc2bytes5[(left >>> 8) & 0xf] | |
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pc2bytes6[(left >>> 4) & 0xf]); |
|
var righttmp = ( |
|
pc2bytes7[right >>> 28] | pc2bytes8[(right >>> 24) & 0xf] | |
|
pc2bytes9[(right >>> 20) & 0xf] | pc2bytes10[(right >>> 16) & 0xf] | |
|
pc2bytes11[(right >>> 12) & 0xf] | pc2bytes12[(right >>> 8) & 0xf] | |
|
pc2bytes13[(right >>> 4) & 0xf]); |
|
tmp = ((righttmp >>> 16) ^ lefttmp) & 0x0000ffff; |
|
keys[n++] = lefttmp ^ tmp; |
|
keys[n++] = righttmp ^ (tmp << 16); |
|
} |
|
} |
|
|
|
return keys; |
|
} |
|
|
|
/** |
|
* Updates a single block (1 byte) using DES. The update will either |
|
* encrypt or decrypt the block. |
|
* |
|
* @param keys the expanded keys. |
|
* @param input the input block (an array of 32-bit words). |
|
* @param output the updated output block. |
|
* @param decrypt true to decrypt the block, false to encrypt it. |
|
*/ |
|
function _updateBlock(keys, input, output, decrypt) { |
|
// set up loops for single or triple DES |
|
var iterations = keys.length === 32 ? 3 : 9; |
|
var looping; |
|
if(iterations === 3) { |
|
looping = decrypt ? [30, -2, -2] : [0, 32, 2]; |
|
} else { |
|
looping = (decrypt ? |
|
[94, 62, -2, 32, 64, 2, 30, -2, -2] : |
|
[0, 32, 2, 62, 30, -2, 64, 96, 2]); |
|
} |
|
|
|
var tmp; |
|
|
|
var left = input[0]; |
|
var right = input[1]; |
|
|
|
// first each 64 bit chunk of the message must be permuted according to IP |
|
tmp = ((left >>> 4) ^ right) & 0x0f0f0f0f; |
|
right ^= tmp; |
|
left ^= (tmp << 4); |
|
|
|
tmp = ((left >>> 16) ^ right) & 0x0000ffff; |
|
right ^= tmp; |
|
left ^= (tmp << 16); |
|
|
|
tmp = ((right >>> 2) ^ left) & 0x33333333; |
|
left ^= tmp; |
|
right ^= (tmp << 2); |
|
|
|
tmp = ((right >>> 8) ^ left) & 0x00ff00ff; |
|
left ^= tmp; |
|
right ^= (tmp << 8); |
|
|
|
tmp = ((left >>> 1) ^ right) & 0x55555555; |
|
right ^= tmp; |
|
left ^= (tmp << 1); |
|
|
|
// rotate left 1 bit |
|
left = ((left << 1) | (left >>> 31)); |
|
right = ((right << 1) | (right >>> 31)); |
|
|
|
for(var j = 0; j < iterations; j += 3) { |
|
var endloop = looping[j + 1]; |
|
var loopinc = looping[j + 2]; |
|
|
|
// now go through and perform the encryption or decryption |
|
for(var i = looping[j]; i != endloop; i += loopinc) { |
|
var right1 = right ^ keys[i]; |
|
var right2 = ((right >>> 4) | (right << 28)) ^ keys[i + 1]; |
|
|
|
// passing these bytes through the S selection functions |
|
tmp = left; |
|
left = right; |
|
right = tmp ^ ( |
|
spfunction2[(right1 >>> 24) & 0x3f] | |
|
spfunction4[(right1 >>> 16) & 0x3f] | |
|
spfunction6[(right1 >>> 8) & 0x3f] | |
|
spfunction8[right1 & 0x3f] | |
|
spfunction1[(right2 >>> 24) & 0x3f] | |
|
spfunction3[(right2 >>> 16) & 0x3f] | |
|
spfunction5[(right2 >>> 8) & 0x3f] | |
|
spfunction7[right2 & 0x3f]); |
|
} |
|
// unreverse left and right |
|
tmp = left; |
|
left = right; |
|
right = tmp; |
|
} |
|
|
|
// rotate right 1 bit |
|
left = ((left >>> 1) | (left << 31)); |
|
right = ((right >>> 1) | (right << 31)); |
|
|
|
// now perform IP-1, which is IP in the opposite direction |
|
tmp = ((left >>> 1) ^ right) & 0x55555555; |
|
right ^= tmp; |
|
left ^= (tmp << 1); |
|
|
|
tmp = ((right >>> 8) ^ left) & 0x00ff00ff; |
|
left ^= tmp; |
|
right ^= (tmp << 8); |
|
|
|
tmp = ((right >>> 2) ^ left) & 0x33333333; |
|
left ^= tmp; |
|
right ^= (tmp << 2); |
|
|
|
tmp = ((left >>> 16) ^ right) & 0x0000ffff; |
|
right ^= tmp; |
|
left ^= (tmp << 16); |
|
|
|
tmp = ((left >>> 4) ^ right) & 0x0f0f0f0f; |
|
right ^= tmp; |
|
left ^= (tmp << 4); |
|
|
|
output[0] = left; |
|
output[1] = right; |
|
} |
|
|
|
/** |
|
* Deprecated. Instead, use: |
|
* |
|
* forge.cipher.createCipher('DES-<mode>', key); |
|
* forge.cipher.createDecipher('DES-<mode>', key); |
|
* |
|
* Creates a deprecated DES cipher object. This object's mode will default to |
|
* CBC (cipher-block-chaining). |
|
* |
|
* The key may be given as a binary-encoded string of bytes or a byte buffer. |
|
* |
|
* @param options the options to use. |
|
* key the symmetric key to use (64 or 192 bits). |
|
* output the buffer to write to. |
|
* decrypt true for decryption, false for encryption. |
|
* mode the cipher mode to use (default: 'CBC'). |
|
* |
|
* @return the cipher. |
|
*/ |
|
function _createCipher(options) { |
|
options = options || {}; |
|
var mode = (options.mode || 'CBC').toUpperCase(); |
|
var algorithm = 'DES-' + mode; |
|
|
|
var cipher; |
|
if(options.decrypt) { |
|
cipher = forge.cipher.createDecipher(algorithm, options.key); |
|
} else { |
|
cipher = forge.cipher.createCipher(algorithm, options.key); |
|
} |
|
|
|
// backwards compatible start API |
|
var start = cipher.start; |
|
cipher.start = function(iv, options) { |
|
// backwards compatibility: support second arg as output buffer |
|
var output = null; |
|
if(options instanceof forge.util.ByteBuffer) { |
|
output = options; |
|
options = {}; |
|
} |
|
options = options || {}; |
|
options.output = output; |
|
options.iv = iv; |
|
start.call(cipher, options); |
|
}; |
|
|
|
return cipher; |
|
}
|
|
|