<!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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