48 lines
979 B
JavaScript
48 lines
979 B
JavaScript
var aes = require('aes');
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var AES = function AES() {
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};
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AES.encrypt = function(messagebuf, keybuf) {
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var key = AES.buf2words(keybuf);
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var message = AES.buf2words(messagebuf);
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var a = new aes(key);
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var enc = a.encrypt(message);
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var encbuf = AES.words2buf(enc);
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return encbuf;
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};
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AES.decrypt = function(encbuf, keybuf) {
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var enc = AES.buf2words(encbuf);
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var key = AES.buf2words(keybuf);
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var a = new aes(key);
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var message = a.decrypt(enc);
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var messagebuf = AES.words2buf(message);
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return messagebuf;
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};
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AES.buf2words = function(buf) {
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if (buf.length % 4)
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throw new Error('buf length must be a multiple of 4');
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var words = [];
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for (var i = 0; i < buf.length / 4; i++) {
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words.push(buf.readUInt32BE(i * 4));
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};
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return words;
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};
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AES.words2buf = function(words) {
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var buf = new Buffer(words.length * 4);
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for (var i = 0; i < words.length; i++) {
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buf.writeUInt32BE(words[i], i * 4);
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};
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return buf;
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};
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module.exports = AES;
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