35 lines
994 B
JavaScript
35 lines
994 B
JavaScript
/*
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CryptoJS v3.1.2
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code.google.com/p/crypto-js
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(c) 2009-2013 by Jeff Mott. All rights reserved.
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code.google.com/p/crypto-js/wiki/License
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*/
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/**
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* ANSI X.923 padding strategy.
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*/
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CryptoJS.pad.AnsiX923 = {
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pad: function (data, blockSize) {
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// Shortcuts
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var dataSigBytes = data.sigBytes;
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var blockSizeBytes = blockSize * 4;
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// Count padding bytes
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var nPaddingBytes = blockSizeBytes - dataSigBytes % blockSizeBytes;
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// Compute last byte position
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var lastBytePos = dataSigBytes + nPaddingBytes - 1;
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// Pad
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data.clamp();
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data.words[lastBytePos >>> 2] |= nPaddingBytes << (24 - (lastBytePos % 4) * 8);
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data.sigBytes += nPaddingBytes;
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},
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unpad: function (data) {
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// Get number of padding bytes from last byte
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var nPaddingBytes = data.words[(data.sigBytes - 1) >>> 2] & 0xff;
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// Remove padding
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data.sigBytes -= nPaddingBytes;
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}
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};
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