How to encrypt form fields

For a very specific use case, we need to "emulate" user actions through the web GUI (api is not an option in here due to lack of endpoint for some actions)

In order for actions like login or form submission we need to send the encrypted[Field] (ex: encryptedPassword)

Trough some digging in the JS code, I found that the field is encrypted based on the publicKey value which I believe to be a HEX String, unfortunately I haven't been able to replicate the process correctly, as all the encrypted fields I'm able to generate return a invalid username or password

This is the snippet I've been working on to generate the field

//form publicKey
String auth_mod = "0085c9815a503cc1b7fc671c9d70bd05528d3b97809c7504c5c9a5fab81d42de93e9333e0673e57b086"+
                  "af01ecf0044df86fd577ca9f0559927c18fae31542a3dd9a604b1b76abe3ee4249d7e74a457b5c665c8a"+
                  "ab2e67828567f32466453842b1fba14e776b9ba591ff05375f6969ac36e457e242adfd0b795d34d982a151b8fc3";

//Exp
String auth_exp = "10001";

//String to encrypt
byte[] bytepass = StringUtils.getBytesUtf8("password");

//Create RSA spec with returned data (16 = hex input - radix)
RSAPublicKeySpec rsa_params = new RSAPublicKeySpec(new BigInteger(auth_mod, 16), new BigInteger(auth_exp, 16));

//RSA Encrypting
KeyFactory factory = KeyFactory.getInstance("RSA");

//Create a public key with params
PublicKey pub = factory.generatePublic(rsa_params);

//Create a RSA cipher
Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");


//Set the cipher to encrypt using the public key
cipher.init(Cipher.ENCRYPT_MODE, pub);

//Encode the password
byte[] pass_encrypted = cipher.doFinal((bytepass));
String hex_pass = Hex.encodeHexString(pass_encrypted);
System.out.println("Encrypted => " + hex_pass);
System.out.println("Length => " + hex_pass.length());