49 lines
1.2 KiB
JavaScript
49 lines
1.2 KiB
JavaScript
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;(function (root, factory, undef) {
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if (typeof exports === "object") {
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// CommonJS
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module.exports = exports = factory(require("./core"), require("./cipher-core"));
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}
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else if (typeof define === "function" && define.amd) {
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// AMD
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define(["./core", "./cipher-core"], factory);
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}
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else {
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// Global (browser)
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factory(root.CryptoJS);
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}
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}(this, function (CryptoJS) {
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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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return CryptoJS.pad.Ansix923;
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}));
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