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