<?php
function maskMobile($mobile)
{
    return substr($mobile, 0, 0)
        . str_repeat('*', (strlen($mobile) - 3))
        . substr($mobile, -3);
}

function encrypt_data($data)
{
    $plaintext = $data;
    $password = 'nkwp#8910792313';
    $method = "AES-256-CBC";
    $key = hash('sha256', $password, true);
    $iv = openssl_random_pseudo_bytes(16);
    $ciphertext = openssl_encrypt($plaintext, $method, $key, OPENSSL_RAW_DATA, $iv);
    $hash = hash_hmac('sha256', $ciphertext, $key, true);
    return $iv . $hash . $ciphertext;
}

function decrypt_data($data)
{
    $ivHashCiphertext = $data;
    $password = 'nkwp#8910792313';
    $method = "AES-256-CBC";
    $iv = substr($ivHashCiphertext, 0, 16);
    $hash = substr($ivHashCiphertext, 16, 32);
    $ciphertext = substr($ivHashCiphertext, 48);
    $key = hash('sha256', $password, true);
    if (hash_hmac('sha256', $ciphertext, $key, true) !== $hash)
        return null;
    return openssl_decrypt($ciphertext, $method, $key, OPENSSL_RAW_DATA, $iv);
}

function verifyNewMobile($otp, $stPhone)
{
    $sender_id = "GRAPOS";
    $type = 'NORMAL';
    include_once '/var/www/nclive/backend/sendsmsapi.php';
    $mnt_message = "OTP to approve registration for Naukri Connect is  " . $otp . ". Please do not share this OTP with anyone.\nGraposs Connect";

    $encodedMessage = urlencode($mnt_message);
    $obj = new Sendsms();
    $obj->sendMessage($sender_id, $stPhone, $encodedMessage, $type, $otp);
    return $otp; // return array('status'=>'1','otp'=>$username,'phone'=>$stPhone);
}
?>