我有使用RC4算法加密文件的代码. 我被强烈建议使用一种更可靠的算法:AES. 从CryptoJS文档中,我了解到它的工作方式与RC4相同.也就是说,第一个参数是要加密的字符串,第二个参数是密码字符串.
但简单地用AES取代RC4方法是没有帮助的,我不知道从哪里寻找必要的信息.
谢谢!
以下是我的工作代码(针对RC4):
<script src="https://cdnjs.cloudflare.com/ajax/libs/crypto-js/4.1.1/crypto-js.min.js" integrity="sha512-E8QSvWZ0eCLGk4km3hxSsNmGWbLtSCSUcewDQPQWZF6pEU8GlT8a5fF32wOl1i8ftdMhssTrF/OhyGWwonTcXA==" crossorigin="anonymous" referrerpolicy="no-referrer"></script>
<div>
<h1>encrypt/decrypt file</h1>
<ol>
<li>Set password</li>
<li>Pick a file</li>
<li>Download decrypted/encrypted file</li>
</ol>
<div>
<input type="text" id="pass" placeholder="pass">
<button id="encrypt">encrypt file</button>
<button id="decrypt">decrypt file</button>
<button id="test">test</button>
</div>
</div>
<script>
// support
const download = (data, filename, type) => {
const file = new Blob([data], {
type: type
});
const a = document.createElement('a');
const url = URL.createObjectURL(file);
a.href = url;
a.download = filename;
document.body.appendChild(a);
a.click();
setTimeout(function() {
document.body.removeChild(a);
window.URL.revokeObjectURL(url);
}, 0);
};
const pickAFile = (getText = true) => {
return new Promise((resolve, reject) => {
const input = document.createElement('input');
input.type = 'file';
input.onchange = (e) => {
const file = e.target.files[0];
const reader = new FileReader();
if (!getText) {
resolve(file);
} else {
reader.onload = (e) => resolve(e.target.result);
reader.onerror = (e) => reject(e);
reader.readAsText(file);
}
};
input.click();
});
};
const convertWordArrayToUint8Array = (wordArray) => {
const arrayOfWords = wordArray.hasOwnProperty('words') ? wordArray.words : [];
const length = wordArray.hasOwnProperty('sigBytes') ?
wordArray.sigBytes :
arrayOfWords.length * 4;
const uInt8Array = new Uint8Array(length);
let index = 0;
let word;
let i;
for (i = 0; i < length; i++) {
word = arrayOfWords[i];
uInt8Array[index++] = word >> 24;
uInt8Array[index++] = (word >> 16) & 0xff;
uInt8Array[index++] = (word >> 8) & 0xff;
uInt8Array[index++] = word & 0xff;
}
return uInt8Array;
};
// /support
function app() {
const passNode = document.querySelector('input#pass');
const encryptNode = document.querySelector('#encrypt');
const decryptNode = document.querySelector('#decrypt');
encryptNode.addEventListener('click', () => {
if (!passNode.value) return alert('Password input is empty! Aborting.');
const pass = CryptoJS.SHA3(passNode.value);
pickAFile(false).then((file) => {
const reader = new FileReader();
reader.onload = (e) => {
const wordArray = CryptoJS.lib.WordArray.create(e.target.result);
const encrypted = CryptoJS.RC4.encrypt(wordArray, pass).toString();
download(encrypted, `encrypted-${file.name}`, file.type);
};
reader.readAsArrayBuffer(file);
});
});
decryptNode.addEventListener('click', () => {
if (!passNode.value) return alert('Password input is empty! Aborting.');
const pass = CryptoJS.SHA3(passNode.value);
pickAFile(false).then((file) => {
const reader = new FileReader();
reader.onload = (e) => {
try {
const decrypted = CryptoJS.RC4.decrypt(e.target.result, pass);
const typedArray = convertWordArrayToUint8Array(decrypted);
download(typedArray, `decrypted-${file.name}`, file.type);
} catch (error) {
console.log('wrong password!');
}
};
reader.readAsText(file);
});
});
}
if (document.readyState === 'loading') {
document.addEventListener('DOMContentLoaded', app);
} else {
app();
}
</script>