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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
+*/
+/**
+ * ANSI X.923 padding strategy.
+ */
+CryptoJS.pad.AnsiX923 = {
+ pad: function (data, blockSize) {
+ // Shortcuts
+ var dataSigBytes = data.sigBytes;
+ var blockSizeBytes = blockSize * 4;
+
+ // Count padding bytes
+ var nPaddingBytes = blockSizeBytes - dataSigBytes % blockSizeBytes;
+
+ // Compute last byte position
+ var lastBytePos = dataSigBytes + nPaddingBytes - 1;
+
+ // Pad
+ data.clamp();
+ data.words[lastBytePos >>> 2] |= nPaddingBytes << (24 - (lastBytePos % 4) * 8);
+ data.sigBytes += nPaddingBytes;
+ },
+
+ unpad: function (data) {
+ // Get number of padding bytes from last byte
+ var nPaddingBytes = data.words[(data.sigBytes - 1) >>> 2] & 0xff;
+
+ // Remove padding
+ data.sigBytes -= nPaddingBytes;
+ }
+};