login.py

 # -*- coding: utf-8 -*-
import scrapy
import hashlib
from scrapy.http import FormRequest

class ItrlogSpider(scrapy.Spider):
    name = 'itrlog'
    start_urls = ['http://itr.lacecal.es/page/index.php?s=login']
    


    def parse(self, response):   
        token = response.xpath('//input[@name="token"]/@value').extract_first()

        #Website algorithm for encrypting the password
        # you start by encrypting the password to sha1
        # you add the token to the encrypted password
        # then you encrypt again password+token       

        #put your password in here, replace 'mypassword'
        password_encrypted = hashlib.sha1(b"mypassword").hexdigest()
        password_token = f"{password_encrypted}{token}"
        password_token_encrypted = hashlib.sha1(str.encode(password_token)).hexdigest()    


        yield FormRequest.from_response(response=response, formxpath ="//form[@id='form_login']",formdata={
            'token':token,
            'password':password_token_encrypted,
            'user':'myuser', #username
            'dummy':'**********', #this must be left like this
            'login':'Login',
        },callback=self.after_login)

    def after_login(self,response):
        yield {
            'token':response.xpath('//input[@name="token"]/@value').extract_first(),
            'palabra':response.xpath('//input[@name="password"]/@value').extract_first(),
            'Dato': response.xpath('//a[@class="active"]/text()').extract_first()
        }