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| author | Haakon Meland Eriksen <haakon.eriksen@far.no> | 2014-06-24 19:34:36 +0200 |
|---|---|---|
| committer | Haakon Meland Eriksen <haakon.eriksen@far.no> | 2014-06-24 19:34:36 +0200 |
| commit | b8dc9e855af2d30f33d0f90dc13d8cad0a7b3e70 (patch) | |
| tree | 718df6305bcb82c8dcb4b287a7132422e748cdfb /library/cryptojs/components/rc4.js | |
| parent | c2d520f1be115fb3cb5da2a35eb10146cecee8aa (diff) | |
| parent | a92fb0b04c3e6474ec48faf8e4cc65c382e89d66 (diff) | |
| download | volse-hubzilla-b8dc9e855af2d30f33d0f90dc13d8cad0a7b3e70.tar.gz volse-hubzilla-b8dc9e855af2d30f33d0f90dc13d8cad0a7b3e70.tar.bz2 volse-hubzilla-b8dc9e855af2d30f33d0f90dc13d8cad0a7b3e70.zip | |
Merge remote-tracking branch 'upstream/master'
Diffstat (limited to 'library/cryptojs/components/rc4.js')
| -rw-r--r-- | library/cryptojs/components/rc4.js | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/library/cryptojs/components/rc4.js b/library/cryptojs/components/rc4.js new file mode 100644 index 000000000..69ccb1375 --- /dev/null +++ b/library/cryptojs/components/rc4.js @@ -0,0 +1,125 @@ +/* +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;
+
+ /**
+ * RC4 stream cipher algorithm.
+ */
+ var RC4 = C_algo.RC4 = StreamCipher.extend({
+ _doReset: function () {
+ // Shortcuts
+ var key = this._key;
+ var keyWords = key.words;
+ var keySigBytes = key.sigBytes;
+
+ // Init sbox
+ var S = this._S = [];
+ for (var i = 0; i < 256; i++) {
+ S[i] = i;
+ }
+
+ // Key setup
+ for (var i = 0, j = 0; i < 256; i++) {
+ var keyByteIndex = i % keySigBytes;
+ var keyByte = (keyWords[keyByteIndex >>> 2] >>> (24 - (keyByteIndex % 4) * 8)) & 0xff;
+
+ j = (j + S[i] + keyByte) % 256;
+
+ // Swap
+ var t = S[i];
+ S[i] = S[j];
+ S[j] = t;
+ }
+
+ // Counters
+ this._i = this._j = 0;
+ },
+
+ _doProcessBlock: function (M, offset) {
+ M[offset] ^= generateKeystreamWord.call(this);
+ },
+
+ keySize: 256/32,
+
+ ivSize: 0
+ });
+
+ function generateKeystreamWord() {
+ // Shortcuts
+ var S = this._S;
+ var i = this._i;
+ var j = this._j;
+
+ // Generate keystream word
+ var keystreamWord = 0;
+ for (var n = 0; n < 4; n++) {
+ i = (i + 1) % 256;
+ j = (j + S[i]) % 256;
+
+ // Swap
+ var t = S[i];
+ S[i] = S[j];
+ S[j] = t;
+
+ keystreamWord |= S[(S[i] + S[j]) % 256] << (24 - n * 8);
+ }
+
+ // Update counters
+ this._i = i;
+ this._j = j;
+
+ return keystreamWord;
+ }
+
+ /**
+ * Shortcut functions to the cipher's object interface.
+ *
+ * @example
+ *
+ * var ciphertext = CryptoJS.RC4.encrypt(message, key, cfg);
+ * var plaintext = CryptoJS.RC4.decrypt(ciphertext, key, cfg);
+ */
+ C.RC4 = StreamCipher._createHelper(RC4);
+
+ /**
+ * Modified RC4 stream cipher algorithm.
+ */
+ var RC4Drop = C_algo.RC4Drop = RC4.extend({
+ /**
+ * Configuration options.
+ *
+ * @property {number} drop The number of keystream words to drop. Default 192
+ */
+ cfg: RC4.cfg.extend({
+ drop: 192
+ }),
+
+ _doReset: function () {
+ RC4._doReset.call(this);
+
+ // Drop
+ for (var i = this.cfg.drop; i > 0; i--) {
+ generateKeystreamWord.call(this);
+ }
+ }
+ });
+
+ /**
+ * Shortcut functions to the cipher's object interface.
+ *
+ * @example
+ *
+ * var ciphertext = CryptoJS.RC4Drop.encrypt(message, key, cfg);
+ * var plaintext = CryptoJS.RC4Drop.decrypt(ciphertext, key, cfg);
+ */
+ C.RC4Drop = StreamCipher._createHelper(RC4Drop);
+}());
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