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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/mode-cfb.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/mode-cfb.js')
| -rw-r--r-- | library/cryptojs/components/mode-cfb.js | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/library/cryptojs/components/mode-cfb.js b/library/cryptojs/components/mode-cfb.js new file mode 100644 index 000000000..fee8829bd --- /dev/null +++ b/library/cryptojs/components/mode-cfb.js @@ -0,0 +1,64 @@ +/* +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 +*/ +/**
+ * Cipher Feedback block mode.
+ */
+CryptoJS.mode.CFB = (function () {
+ var CFB = CryptoJS.lib.BlockCipherMode.extend();
+
+ CFB.Encryptor = CFB.extend({
+ processBlock: function (words, offset) {
+ // Shortcuts
+ var cipher = this._cipher;
+ var blockSize = cipher.blockSize;
+
+ generateKeystreamAndEncrypt.call(this, words, offset, blockSize, cipher);
+
+ // Remember this block to use with next block
+ this._prevBlock = words.slice(offset, offset + blockSize);
+ }
+ });
+
+ CFB.Decryptor = CFB.extend({
+ processBlock: function (words, offset) {
+ // Shortcuts
+ var cipher = this._cipher;
+ var blockSize = cipher.blockSize;
+
+ // Remember this block to use with next block
+ var thisBlock = words.slice(offset, offset + blockSize);
+
+ generateKeystreamAndEncrypt.call(this, words, offset, blockSize, cipher);
+
+ // This block becomes the previous block
+ this._prevBlock = thisBlock;
+ }
+ });
+
+ function generateKeystreamAndEncrypt(words, offset, blockSize, cipher) {
+ // Shortcut
+ var iv = this._iv;
+
+ // Generate keystream
+ if (iv) {
+ var keystream = iv.slice(0);
+
+ // Remove IV for subsequent blocks
+ this._iv = undefined;
+ } else {
+ var keystream = this._prevBlock;
+ }
+ cipher.encryptBlock(keystream, 0);
+
+ // Encrypt
+ for (var i = 0; i < blockSize; i++) {
+ words[offset + i] ^= keystream[i];
+ }
+ }
+
+ return CFB;
+}());
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