原生js的RSA和AES加密解密代码,JS代码库,德仔网

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【JS】原生js的RSA和AES加密解密

作者:zhangweijia / 发布于2015/3/5/ 1039

在看web api时发现浏览器竟然提供了原生的RSA和AES的加密解密方法。然后就试了一下，速度还是很快的。相关内容https://developer.mozilla.org/en-US/docs/Web/API/Crypto, google的例子 https://chromium.googlesource.com/chromium/blink/+/72fef91ac1ef679207f51def8133b336a6f6588f/LayoutTests/crypto(这个是chromium的测试代码，里面包含了使用的方法)


	<!doctype html>
	<html>
	 <head>
	 <meta charset='UTF-8'>
	 </head>
	 <body>
	 <div class='test'></div>
	 <script type="text/javascript">
	
	 function encrypt(data, keyJSON){
	 var data = new TextEncoder("UTF-8").encode(data);
	 var randomsKeys = geneRandomHexStr(64); // 128 bit keys
	 var encryptedKey = hexStringToUint8Array(randomsKeys);
	 var aesAlgo = {name: 'aes-cbc', iv: hexStringToUint8Array("000102030405060708090a0b0c0d0e0f")};
	 return crypto.subtle.importKey("jwk", keyJSON, {name: "rsa-oaep", hash: {name: "sha-256"}},true, ['encrypt'])
	 .then(function(publicKey){
	 return crypto.subtle.encrypt({name: "rsa-oaep"}, publicKey, encryptedKey);
	 }).then(function(res){
	 encryptedKey = bytesToHexString(res)
	 // use aes to encrypt data
	 // import aes key
	 return crypto.subtle.importKey('raw',
	 hexStringToUint8Array(randomsKeys) , aesAlgo, false, ['encrypt', 'decrypt']);
	
	 }).then(function(result){
	 // use aes to encode
	 return crypto.subtle.encrypt(aesAlgo,
	 result, data);
	 }).then(function(encryptedData){
	 return Promise.resolve({
	 'encrypted': bytesToHexString(encryptedData),
	 'encryptedKey': encryptedKey,
	 });
	 });
	
	 //console.log(new TextDecoder("UTF-8").decode(data));
	 // use server public key to encrypt
	
	 }
	
	 function decrypt(data, keyJSON){
	 // use local private key to decrypt
	 var encryptedKey = new hexStringToUint8Array(data.encryptedKey);
	 var encryptedData = new hexStringToUint8Array(data.encrypted);
	 var aesAlgo = {name: 'aes-cbc', iv: hexStringToUint8Array("000102030405060708090a0b0c0d0e0f")};
	 // decrypt key
	 return crypto.subtle.importKey('jwk', keyJSON, {name: "rsa-oaep", hash: {name: "sha-256"}}, true,
	 ['decrypt']).then(function(privateKey){
	 return crypto.subtle.decrypt({name: 'rsa-oaep'}, privateKey, encryptedKey);
	 }).then(function(decryptedKey){
	 // import aes key
	 return crypto.subtle.importKey('raw',
	 decryptedKey, aesAlgo, false, ['encrypt', 'decrypt']);
	 }).catch(function(){
	 console.error("decrypt error");
	 }).then(function(result){
	 // decode encrypted data
	 return crypto.subtle.decrypt(aesAlgo, result, encryptedData);
	 }).then(function(data){
	 return Promise.resolve(new TextDecoder("UTF-8").decode(new Uint8Array(data)));
	 })
	
	 }
	
	 function createNewUserKey(){
	 var algorithmKeyGen = {
	 name: "RSA-OAEP",
	 hash: {name: "sha-256"},
	 // RsaKeyGenParams
	 modulusLength: 2048,
	 publicExponent: new Uint8Array([0x01, 0x00, 0x01]), // Equivalent to 65537
	 };
	 var nonExtractable = false;
	
	 var publicKey = "";
	 var privateKey = "";
	 var keyPairs = "";
	 return crypto.subtle.generateKey(algorithmKeyGen, true, ['encrypt', 'decrypt']).then(function(result) {
	 // gene key pair
	 keyPairs = result;
	 return Promise.all([crypto.subtle.exportKey("jwk", keyPairs.publicKey),
	 crypto.subtle.exportKey("jwk", keyPairs.privateKey)]);
	 })
	
	 }
	
	 function _arrayBufferToBase64( buffer ) {
	 var binary = '';
	 var bytes = new Uint8Array( buffer );
	 var len = bytes.byteLength;
	 for (var i = 0; i < len; i++) {
	 binary += String.fromCharCode( bytes[ i ] );
	 }
	 return window.btoa( binary );
	 }
	
	 function hexStringToUint8Array(hexString) {
	 if (hexString.length % 2 != 0)
	 throw "Invalid hexString";
	 var arrayBuffer = new Uint8Array(hexString.length / 2);
	 for (var i = 0; i < hexString.length; i += 2) {
	 var byteValue = parseInt(hexString.substr(i, 2), 16);
	 if (byteValue == NaN)
	 throw "Invalid hexString";
	 arrayBuffer[i/2] = byteValue;
	 }
	 return arrayBuffer;
	 }
	
	 function bytesToHexString(bytes) {
	 if (!bytes)
	 return null;
	 bytes = new Uint8Array(bytes);
	 var hexBytes = [];
	 for (var i = 0; i < bytes.length; ++i) {
	 var byteString = bytes[i].toString(16);
	 if (byteString.length < 2)
	 byteString = "0" + byteString;
	 hexBytes.push(byteString);
	 }
	 return hexBytes.join("");
	 }
	
	 function geneRandomHexStr(length){
	 var text = "";
	 var possible = "0123456789abcdef";
	
	 for( var i=0; i < length; i++ )
	 text += possible.charAt(Math.floor(Math.random() * possible.length));
	
	 return text;
	 }
	
	 createNewUserKey().then(function(keyPairs){
	 encrypt("this is origin text", keyPairs[0]).then(function(res){
	 console.log('public', JSON.stringify(keyPairs[0]));
	 console.log('private', JSON.stringify(keyPairs[1]));
	 decrypt(res, keyPairs[1]).then(function(decrypted){
	 console.log('decrypted', decrypted);
	 });
	 });
	 })
	
	 </script>
	 </body>
	</html>

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