36 lines
994 B
JavaScript
36 lines
994 B
JavaScript
|
/*
|
||
|
|
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;
|
||
|
|
}
|
||
|
|
};
|