php 7.3 mcrypt replacement code

private function encrypt( $data, $key ) {
    $salt = 'cH!swe!retReGu7W6bEDRup7usuDUh9THeD2CHeGE*ewr4n39=E@rAsp7c-Ph@pH';
    $iv_size = openssl_cipher_iv_length( "AES-256-CBC-HMAC-SHA256" );
    $hash = hash( 'sha256', $salt . $key . $salt );
    $iv = substr( $hash, strlen( $hash ) - $iv_size );
    $key = substr( $hash, 0, 32 );
    $encrypted = base64_encode( openssl_encrypt( $data, "AES-256-CBC-HMAC-SHA256", $key, OPENSSL_RAW_DATA, $iv ) );

    return $encrypted;
}

private function decrypt( $data, $key ) {
    $salt = 'cH!swe!retReGu7W6bEDRup7usuDUh9THeD2CHeGE*ewr4n39=E@rAsp7c-Ph@pH';
    $iv_size = openssl_cipher_iv_length( "AES-256-CBC-HMAC-SHA256" );
    $hash = hash( 'sha256', $salt . $key . $salt );
    $iv = substr( $hash, strlen( $hash ) - $iv_size );
    $key = substr( $hash, 0, 32 );
    $decrypted = openssl_decrypt( base64_decode( $data ), "AES-256-CBC-HMAC-SHA256", $key, OPENSSL_RAW_DATA, $iv );
    $decrypted = rtrim( $decrypted, "\0" );

    return $decrypted;
}


// code from here
// https://stackoverflow.com/questions/45246461/convert-framework-from-mcrypt-to-openssl