signcheck.py

from OpenSSL import crypto
import os

fk = open('security/server.key','r')
k = crypto.load_privatekey(crypto.FILETYPE_PEM, fk.read())
fcert = open('security/server.crt','r')
cert = crypto.load_certificate(crypto.FILETYPE_PEM, fcert.read())
signature = crypto.sign(k, 'data', 'sha1')
try:
    crypto.verify(cert, signature, 'data', 'sha1')
    print('good signature')
except:
    print('wrong signature')