1 files changed, 35 insertions, 0 deletions
diff --git a/library/cryptojs/components/pad-ansix923.js b/library/cryptojs/components/pad-ansix923.js
new file mode 100644
index 000000000..4da25d68e
--- /dev/null
+++ b/library/cryptojs/components/pad-ansix923.js
@@ -0,0 +1,35 @@
+/*
+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;
+    }
+};