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authorfriendica <info@friendica.com>2013-11-07 23:25:13 -0800
committerfriendica <info@friendica.com>2013-11-07 23:25:13 -0800
commit3a9cbcaf011f5c5d423e1cd99b43442669692129 (patch)
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+/*
+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
+*/
+/** @preserve
+ * Counter block mode compatible with Dr Brian Gladman fileenc.c
+ * derived from CryptoJS.mode.CTR
+ * Jan Hruby jhruby.web@gmail.com
+ */
+CryptoJS.mode.CTRGladman = (function () {
+ var CTRGladman = CryptoJS.lib.BlockCipherMode.extend();
+
+ function incWord(word)
+ {
+ if (((word >> 24) & 0xff) === 0xff) { //overflow
+ var b1 = (word >> 16)&0xff;
+ var b2 = (word >> 8)&0xff;
+ var b3 = word & 0xff;
+
+ if (b1 === 0xff) // overflow b1
+ {
+ b1 = 0;
+ if (b2 === 0xff)
+ {
+ b2 = 0;
+ if (b3 === 0xff)
+ {
+ b3 = 0;
+ }
+ else
+ {
+ ++b3;
+ }
+ }
+ else
+ {
+ ++b2;
+ }
+ }
+ else
+ {
+ ++b1;
+ }
+
+ word = 0;
+ word += (b1 << 16);
+ word += (b2 << 8);
+ word += b3;
+ }
+ else
+ {
+ word += (0x01 << 24);
+ }
+ return word;
+ }
+
+ function incCounter(counter)
+ {
+ if ((counter[0] = incWord(counter[0])) === 0)
+ {
+ // encr_data in fileenc.c from Dr Brian Gladman's counts only with DWORD j < 8
+ counter[1] = incWord(counter[1]);
+ }
+ return counter;
+ }
+
+ var Encryptor = CTRGladman.Encryptor = CTRGladman.extend({
+ processBlock: function (words, offset) {
+ // Shortcuts
+ var cipher = this._cipher
+ var blockSize = cipher.blockSize;
+ var iv = this._iv;
+ var counter = this._counter;
+
+ // Generate keystream
+ if (iv) {
+ counter = this._counter = iv.slice(0);
+
+ // Remove IV for subsequent blocks
+ this._iv = undefined;
+ }
+
+ incCounter(counter);
+
+ var keystream = counter.slice(0);
+ cipher.encryptBlock(keystream, 0);
+
+ // Encrypt
+ for (var i = 0; i < blockSize; i++) {
+ words[offset + i] ^= keystream[i];
+ }
+ }
+ });
+
+ CTRGladman.Decryptor = Encryptor;
+
+ return CTRGladman;
+}());
+
+