Encrypt and Decrypt using Js

encryptAndDecrypt.js

async function main() {
    keyPair = await window.crypto.subtle.generateKey(
        {
            name: "RSA-OAEP",
            modulusLength: 2048,
            publicExponent: new Uint8Array([1, 0, 1]),
            hash: "SHA-256",
        },
        true,
        ["encrypt", "decrypt"]
    );

    function getMessageEncoding() {
        let message = "hello"
        let enc = new TextEncoder();
        return enc.encode(message);
    }

   async  function encryptMessage(publicKey) {
        let encoded = getMessageEncoding();
        let encrypted = await window.crypto.subtle.encrypt(
            {
                name: "RSA-OAEP"
            },
            publicKey,
            encoded
        );
        return encrypted;
    }
    let encryptedOuput = await encryptMessage(keyPair.publicKey);
    console.log(encryptedOuput);

    async function decryptMessage(key) {
        let decrypted = await window.crypto.subtle.decrypt(
          {
            name: "RSA-OAEP"
          },
          key,
          encryptedOuput
        );
        let dec = new TextDecoder();
        decrypted = dec.decode(decrypted);
        return decrypted;
      }

      let decryptedOutput = await decryptMessage(keyPair.privateKey);
      console.log(decryptedOutput);


}

main();