<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def generate_security_hash(self, content_type, object_pk, timestamp):
 """ Generate a HMAC security hash from the provided info. """

        info = (content_type, object_pk, timestamp)
        key_salt = "django.contrib.forms.CommentSecurityForm"
        value = "-".join(info)
        return salted_hmac(key_salt, value).hexdigest()