python-pkc11 with javascript + flask

[biyani701]

For my use case, i want to encrypt the string in javascript while string decryption will happen on server side (Flask based application).
I am using the below function. However, if the string is encrypted like this, the returned value is a string and not a bytes object that private key expects.

Below is the code that i am using for encoding after extracting the modulus and exponent from public key in python

modulusB64 = base64.b64encode(public_key[Attribute.MODULUS]).decode('utf-8')
exponentB64 = base64.b64encode(public_key[Attribute.PUBLIC_EXPONENT]).decode('utf-8')

These are passed to javascript.

async function encryptWithPublicKey(modulusB64, exponentB64, data) {
// Decode base64 strings to bytes
function base64ToHex(str) {
var raw = atob(str);
var result = '';
for (var i = 0; i < raw.length; i++) {
var hex = raw.charCodeAt(i).toString(16);
result += (hex.length === 2 ? hex : '0' + hex);
}
return result.toUpperCase();
}

// Decode base64 to hexadecimal
var modulusHex = base64ToHex(modulusB64);
var exponentHex = base64ToHex(exponentB64);

// Create RSAKey object and set public key
    var rsa = new RSAKey();
    rsa.setPublic(modulusHex, exponentHex);
    console.log("set public key" + rsa);

    var encrypted = rsa.encrypt(data);
    return encrypted;
}

the return value encrypted is passed to private key decrypt
key_private[0].decrypt(encrypted_text_hsm)

However, i am getting
<_cython_3_0_10.generator object at 0x0000025EC04F2EF0>

how to address this issue?