How can I generate HMAC in React-Native?

Question

I need to create HmacSHA256 from a string with a private key... I use react-native-crypto-js but I cant use it's HmacSHA256 method, it keeps getting me "undefined function" error, here is my code:

const signature = CryptoJS.HmacSHA256('simple', '123456789');
    const signatureBase = signature.toString(CryptoJS.enc.Base64);

I followed it's document either but still getting same error, if you know another solution or the correct way to use this package please help me. thanks.

Answer 1

I found a work around for react native windows HmacSHA256 Algorithm. I have used 2 packages

Step 1:

  npm install --save  react-native-hash //install this
  import { JSHash, JSHmac, CONSTANTS } from "react-native-hash";

  JSHmac("message", "SecretKey", CONSTANTS.HmacAlgorithms.HmacSHA256)
  .then(hash => hmac_encoded_str=hash)
  .catch(e => console.log(e));

  OR
  let hmac_encoded_str= await JSHmac(canonical_string, "C6PqJwbyW4", 
  CONSTANTS.HmacAlgorithms.HmacSHA256)

Step 2:

  npm install react-native-crypto-js // install this as well
  
  import CryptoJS from "react-native-crypto-js"
  
  CryptoJS.enc.Base64.stringify(CryptoJS.enc.Utf8.parse(hmac_encoded_str));