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Diffstat (limited to 'library/cryptojs/components/rabbit.js')
| -rw-r--r-- | library/cryptojs/components/rabbit.js | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/library/cryptojs/components/rabbit.js b/library/cryptojs/components/rabbit.js new file mode 100644 index 000000000..af8cec88e --- /dev/null +++ b/library/cryptojs/components/rabbit.js @@ -0,0 +1,178 @@ +/* +CryptoJS v3.1.2 +code.google.com/p/crypto-js +(c) 2009-2013 by Jeff Mott. All rights reserved. +code.google.com/p/crypto-js/wiki/License +*/ +(function () {
+ // Shortcuts
+ var C = CryptoJS;
+ var C_lib = C.lib;
+ var StreamCipher = C_lib.StreamCipher;
+ var C_algo = C.algo;
+
+ // Reusable objects
+ var S = [];
+ var C_ = [];
+ var G = [];
+
+ /**
+ * Rabbit stream cipher algorithm
+ */
+ var Rabbit = C_algo.Rabbit = StreamCipher.extend({
+ _doReset: function () {
+ // Shortcuts
+ var K = this._key.words;
+ var iv = this.cfg.iv;
+
+ // Swap endian
+ for (var i = 0; i < 4; i++) {
+ K[i] = (((K[i] << 8) | (K[i] >>> 24)) & 0x00ff00ff) |
+ (((K[i] << 24) | (K[i] >>> 8)) & 0xff00ff00);
+ }
+
+ // Generate initial state values
+ var X = this._X = [
+ K[0], (K[3] << 16) | (K[2] >>> 16),
+ K[1], (K[0] << 16) | (K[3] >>> 16),
+ K[2], (K[1] << 16) | (K[0] >>> 16),
+ K[3], (K[2] << 16) | (K[1] >>> 16)
+ ];
+
+ // Generate initial counter values
+ var C = this._C = [
+ (K[2] << 16) | (K[2] >>> 16), (K[0] & 0xffff0000) | (K[1] & 0x0000ffff),
+ (K[3] << 16) | (K[3] >>> 16), (K[1] & 0xffff0000) | (K[2] & 0x0000ffff),
+ (K[0] << 16) | (K[0] >>> 16), (K[2] & 0xffff0000) | (K[3] & 0x0000ffff),
+ (K[1] << 16) | (K[1] >>> 16), (K[3] & 0xffff0000) | (K[0] & 0x0000ffff)
+ ];
+
+ // Carry bit
+ this._b = 0;
+
+ // Iterate the system four times
+ for (var i = 0; i < 4; i++) {
+ nextState.call(this);
+ }
+
+ // Modify the counters
+ for (var i = 0; i < 8; i++) {
+ C[i] ^= X[(i + 4) & 7];
+ }
+
+ // IV setup
+ if (iv) {
+ // Shortcuts
+ var IV = iv.words;
+ var IV_0 = IV[0];
+ var IV_1 = IV[1];
+
+ // Generate four subvectors
+ var i0 = (((IV_0 << 8) | (IV_0 >>> 24)) & 0x00ff00ff) | (((IV_0 << 24) | (IV_0 >>> 8)) & 0xff00ff00);
+ var i2 = (((IV_1 << 8) | (IV_1 >>> 24)) & 0x00ff00ff) | (((IV_1 << 24) | (IV_1 >>> 8)) & 0xff00ff00);
+ var i1 = (i0 >>> 16) | (i2 & 0xffff0000);
+ var i3 = (i2 << 16) | (i0 & 0x0000ffff);
+
+ // Modify counter values
+ C[0] ^= i0;
+ C[1] ^= i1;
+ C[2] ^= i2;
+ C[3] ^= i3;
+ C[4] ^= i0;
+ C[5] ^= i1;
+ C[6] ^= i2;
+ C[7] ^= i3;
+
+ // Iterate the system four times
+ for (var i = 0; i < 4; i++) {
+ nextState.call(this);
+ }
+ }
+ },
+
+ _doProcessBlock: function (M, offset) {
+ // Shortcut
+ var X = this._X;
+
+ // Iterate the system
+ nextState.call(this);
+
+ // Generate four keystream words
+ S[0] = X[0] ^ (X[5] >>> 16) ^ (X[3] << 16);
+ S[1] = X[2] ^ (X[7] >>> 16) ^ (X[5] << 16);
+ S[2] = X[4] ^ (X[1] >>> 16) ^ (X[7] << 16);
+ S[3] = X[6] ^ (X[3] >>> 16) ^ (X[1] << 16);
+
+ for (var i = 0; i < 4; i++) {
+ // Swap endian
+ S[i] = (((S[i] << 8) | (S[i] >>> 24)) & 0x00ff00ff) |
+ (((S[i] << 24) | (S[i] >>> 8)) & 0xff00ff00);
+
+ // Encrypt
+ M[offset + i] ^= S[i];
+ }
+ },
+
+ blockSize: 128/32,
+
+ ivSize: 64/32
+ });
+
+ function nextState() {
+ // Shortcuts
+ var X = this._X;
+ var C = this._C;
+
+ // Save old counter values
+ for (var i = 0; i < 8; i++) {
+ C_[i] = C[i];
+ }
+
+ // Calculate new counter values
+ C[0] = (C[0] + 0x4d34d34d + this._b) | 0;
+ C[1] = (C[1] + 0xd34d34d3 + ((C[0] >>> 0) < (C_[0] >>> 0) ? 1 : 0)) | 0;
+ C[2] = (C[2] + 0x34d34d34 + ((C[1] >>> 0) < (C_[1] >>> 0) ? 1 : 0)) | 0;
+ C[3] = (C[3] + 0x4d34d34d + ((C[2] >>> 0) < (C_[2] >>> 0) ? 1 : 0)) | 0;
+ C[4] = (C[4] + 0xd34d34d3 + ((C[3] >>> 0) < (C_[3] >>> 0) ? 1 : 0)) | 0;
+ C[5] = (C[5] + 0x34d34d34 + ((C[4] >>> 0) < (C_[4] >>> 0) ? 1 : 0)) | 0;
+ C[6] = (C[6] + 0x4d34d34d + ((C[5] >>> 0) < (C_[5] >>> 0) ? 1 : 0)) | 0;
+ C[7] = (C[7] + 0xd34d34d3 + ((C[6] >>> 0) < (C_[6] >>> 0) ? 1 : 0)) | 0;
+ this._b = (C[7] >>> 0) < (C_[7] >>> 0) ? 1 : 0;
+
+ // Calculate the g-values
+ for (var i = 0; i < 8; i++) {
+ var gx = X[i] + C[i];
+
+ // Construct high and low argument for squaring
+ var ga = gx & 0xffff;
+ var gb = gx >>> 16;
+
+ // Calculate high and low result of squaring
+ var gh = ((((ga * ga) >>> 17) + ga * gb) >>> 15) + gb * gb;
+ var gl = (((gx & 0xffff0000) * gx) | 0) + (((gx & 0x0000ffff) * gx) | 0);
+
+ // High XOR low
+ G[i] = gh ^ gl;
+ }
+
+ // Calculate new state values
+ X[0] = (G[0] + ((G[7] << 16) | (G[7] >>> 16)) + ((G[6] << 16) | (G[6] >>> 16))) | 0;
+ X[1] = (G[1] + ((G[0] << 8) | (G[0] >>> 24)) + G[7]) | 0;
+ X[2] = (G[2] + ((G[1] << 16) | (G[1] >>> 16)) + ((G[0] << 16) | (G[0] >>> 16))) | 0;
+ X[3] = (G[3] + ((G[2] << 8) | (G[2] >>> 24)) + G[1]) | 0;
+ X[4] = (G[4] + ((G[3] << 16) | (G[3] >>> 16)) + ((G[2] << 16) | (G[2] >>> 16))) | 0;
+ X[5] = (G[5] + ((G[4] << 8) | (G[4] >>> 24)) + G[3]) | 0;
+ X[6] = (G[6] + ((G[5] << 16) | (G[5] >>> 16)) + ((G[4] << 16) | (G[4] >>> 16))) | 0;
+ X[7] = (G[7] + ((G[6] << 8) | (G[6] >>> 24)) + G[5]) | 0;
+ }
+
+ /**
+ * Shortcut functions to the cipher's object interface.
+ *
+ * @example
+ *
+ * var ciphertext = CryptoJS.Rabbit.encrypt(message, key, cfg);
+ * var plaintext = CryptoJS.Rabbit.decrypt(ciphertext, key, cfg);
+ */
+ C.Rabbit = StreamCipher._createHelper(Rabbit);
+}());
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