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Basic usage of AES with Output Feedback
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| /// Use public CDN in your frontend <script type="text/javascript" src="https://cdn.rawgit.com/ricmoo/aes-js/e27b99df/index.js"></script> | |
| // Convert it to base 36 (numbers + letters), and grab the first 9 characters | |
| // after the decimal. | |
| var randomStringGenerator = function (length, prefix) { | |
| return (prefix == undefined ? 'key-' : prefix) + Math.random().toString(36).substr(2, (length == undefined ? 5 : length)); | |
| } | |
| // Get ASCII numbers from a string as array | |
| var stringToAscii = function(input){ | |
| var result = []; | |
| for (var key in input) { | |
| if (input.hasOwnProperty(key)) { | |
| result.push(input[key].charCodeAt()); | |
| } | |
| } | |
| return result; | |
| } | |
| var keyGenerator = function(){ | |
| return stringToAscii(randomStringGenerator(12)).join(':'); | |
| } | |
| var ivGenerator = function(){ | |
| return stringToAscii(randomStringGenerator(10, 'keyiv-')).join(':'); | |
| } | |
| var encrypt = function (cipherText){ | |
| var textBytes = aesjs.utils.utf8.toBytes(cipherText); | |
| var aesOfb = new aesjs.ModeOfOperation.ofb(key, iv); | |
| var encryptedBytes = aesOfb.encrypt(textBytes); | |
| return aesjs.utils.hex.fromBytes(encryptedBytes); | |
| } | |
| var decrypt = function(mesage){ | |
| var encryptedBytes = aesjs.utils.hex.toBytes(message); | |
| var aesOfb = new aesjs.ModeOfOperation.ofb(key, iv); | |
| var decryptedBytes = aesOfb.decrypt(encryptedBytes); | |
| return aesjs.utils.utf8.fromBytes(decryptedBytes); | |
| } | |
| var key = ''; | |
| var iv = ''; | |
| $(document).ready(function () { | |
| key = keyGenerator(); | |
| iv = ivGenerator(); | |
| console.log(`Your Key: ${key}`); | |
| console.log(`Your IV: ${iv}`); | |
| do { | |
| key = prompt('Insert your key:'); | |
| } while (key == null); | |
| do { | |
| iv = prompt('Insert your IV:'); | |
| } while (iv == null); | |
| // Get an array from given strings | |
| key = key.split(':').map(function (value) { return parseInt(value) }); | |
| iv = iv.split(':').map(function (value) { return parseInt(value) }); | |
| }); |
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why did you miss the 's' in line 35? That decrypt function would not work.
35: var decrypt = function(mes
age){