Encryption Decryption Using AES 256 in Crypto.js Format Needed

[RohanGau]

Need encryption decryption format written on crypto.js methodology for frontend use.

• we have a sample of java how we will encrypt web redirection essential values in ASE 256 algo but we need a javascript
  description where we can identify how will we do a code in same format using ASE 256 with given keys as mention on
  below.

• Facing a issue while we generate secretkey using salt and key in JS so aeed a javascript code using crypto.js lib will help
  us to encrypt or decrypt value similar format as backend on frontend-side.

• We are using same value as mention on doc:

  IV – This can be 0
  SALT – This will be the reqdate or resdate
  FI – This will be the unique FIU ID ( i.e. the FIU entity id )
  SECRETKEY – This will be the secret passphrase shared by the AA with the FIU.
  

• Sample of JS code what we have designed

// generate secret key using key and salt
const getSecretKey = () => {
  var secretkey = redirectionSecretKey;
  var saltKey = "abcde";
  var key = CryptoJS.enc.Utf8.parse(secretkey);
  var salt = CryptoJS.enc.Utf8.parse(saltKey);
   const generateKey = CryptoJS.PBKDF2(key, salt, {
      keySize: 256,
       iterations: 1000,
   });
 return generateKey;
};

// generate IV
const getIv = () => {
 var iv2 = CryptoJS.lib.WordArray.create([
   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 ]);
 return iv2;
};

// Encryption method
export const encodeDataInASE2 = (data) => {
 var encrypted = CryptoJS.AES.encrypt(
   data,
   getSecretKey2(),
   {
     iv: getIv2(),
     mode: CryptoJS.mode.CBC,
     padding: CryptoJS.pad.Pkcs7,
   }
 ).toString();

 return encrypted;
};

// Decryption method
export const decodeDataFromASE = (ciphertext) => {
 const decryptCiphertext = CryptoJS.AES.decrypt(ciphertext, getSecretKey(), {
   iv: getIv(),
   mode: CryptoJS.mode.CBC,
   padding: CryptoJS.pad.Pkcs7,
 });
 const decryptedData = JSON.parse(
   decryptCiphertext.toString(CryptoJS.enc.Utf8)
 );

 return decryptedData;
};