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# From https://github.com/mitsuhiko/python-pbkdf2

import os, sys, re
import hashlib
from os import urandom
from base64 import b64encode, b64decode
from itertools import izip
from pbkdf2 import pbkdf2_bin

SALT_LENGTH = 12
KEY_LENGTH = 24
HASH_FUNCTION = 'sha256'
COST_FACTOR = 10000
# Parameters to PBKDF2. Only affect new passwords
def make_hash(password):
    if isinstance(password, unicode):
        password = password.encode('utf-8')
    salt = b64encode(urandom(SALT_LENGTH))
    return 'PBKDF2${}${}${}${}'.format(HASH_FUNCTION,COST_FACTOR,salt,b64encode(pbkdf2_bin(password, salt, COST_FACTOR, KEY_LENGTH,getattr(hashlib, HASH_FUNCTION))))

def check_hash(password, hash_):
    if isinstance(password, unicode):
        password = password.encode('utf-8')
    algorithm, hash_function, cost_factor, salt, hash_a = hash_.split('$')
    assert algorithm == 'PBKDF2'
    hash_a = b64decode(hash_a)
    hash_b = pbkdf2_bin(password, salt, int(cost_factor), len(hash_a),
                        getattr(hashlib, hash_function))
    assert len(hash_a) == len(hash_b)  
    diff = 0
    for char_a, char_b in izip(hash_a, hash_b):
        diff |= ord(char_a) ^ ord(char_b)
    return diff == 0

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@route('/register_submit', method='POST')
@route('/register_submit/', method='POST')
def register_submit(db):
    name = (request.forms.get('usernamesignup')).decode('utf-8')
    mail = request.forms.get('emailsignup').decode('utf-8')
    matrnr = request.forms.get('matrnrsignup').decode('utf-8')
    password = (request.forms.get('passwordsignup')).decode('utf-8')
    password_confirm = (request.forms.get('passwordsignup_confirm')).decode('utf-8')
    dat = date.today() 
    sql = db.execute('SELECT StudName, StudMail, StudMatrNr FROM Student WHERE StudName=? or StudMail=? or StudMatrNr=?',(name,mail,matrnr,))
    row = sql.fetchone()
    if row:
      return "/register"
    else:
      if password == password_confirm:
	pwhash = make_hash(password)
	response.set_cookie("account", name, secret='BlaBla', path="/")
	sql=db.execute('INSERT INTO Student(StudName,StudMail,StudMatrNr,StudPassword,StudAdmin,StudTele,FirstName,SecName,TimeStamp,free) VALUES (?,?,?,?,?,?,?,?,?,?)',(name,mail,matrnr,pwhash,'0','123456','Default','Default',dat,'0',))
	return "/hauptmenu"
      else:
	return "/register"

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<script>     
(function() {
$('.regi').bind("submit", function() {
 
        $.ajax({
            type: "POST",
            url: "{{script}}/register_submit",
            data: "&usernamesignup=" + $("#usernamesignup").val() + "&emailsignup=" + $("#emailsignup").val()  + "&matrnrsignup=" + $("#matrnrsignup").val() + "&passwordsignup=" + $("#passwordsignup").val() + "&passwordsignup_confirm=" + $("#passwordsignup_confirm").val(), 
            success: function(response)
            {
		$("#contenti").hide().load("{{script}}"+response).fadeIn(2000);
            }
        });
        return false;
      });
      })();
</script>
<div id="insert_container" >
    <div id="wrapper_pages_small">
	<div id="pages_style_small" class="regi">
            <form id="submitregi" method="POST" action="/register_submit">
                <h1> Willkommen </h1>
                <h2> REGISTER </h2>
                <ul>
		  <li>
		    <p>
		      <label for="username" class="uname" data-icon="u">Benutzername :</label>
		    </p>
		  </li>
		  <li>
		    <p>
		      <input id="usernamesignup" name="usernamesignup" required="required" type="text" placeholder="Benutzername" />
		    </p>
		  </li>
		  <li>
		    <p>
		      <label for="emailsignup" > E-mail :</label>
		    </p>
		  </li>
		  <li>
		    <p>
		      <input id="emailsignup" name="emailsignup" required="required" type="email" placeholder="beispiel@mail.de"/>
		    </p>
		  </li>
		  <li>
		    <p>
		      <label for="matrnr" class="matnr" data-icon="m">MatrikelNr :</label>
		    </p>
		  </li>
		  <li>
		    <p>
		      <input id="matrnrsignup" name="matrnrsignup" required="required" type="text" placeholder="123456789" />
		    </p>
		  </li>
		  <li>
		    <p>
		      <label for="passwordsignup" class="youpasswd" data-icon="p">Passwort :</label>
		    </p>
		  </li>
		  <li>
		    <p>
		      <input id="passwordsignup" name="passwordsignup" required="required" type="password" placeholder="Passwort"/>
		    </p>
		  </li>
		  <li>
		    <p>
		      <label for="passwordsignup_confirm" class="youpasswd" data-icon="p">Passwort bestätigen :</label>
		    </p>
		  </li>
		  <li>
		    <p>
		      <input id="passwordsignup_confirm" name="passwordsignup_confirm" required="required" type="password" placeholder="Passwort erneut eingeben"/>
		    </p>
		  </li>
		  <li>  
		    <p class="signin button">
		      <input type="submit" value="Registrieren"/>
		    </p>
		  </li>
		  <li>
		    <hr />
		    <p id="tipp">bereits Registriert?<a class="change_link" href="../login"> Login </a></p>
		  </li>
		 <ul>
            </form>
        </div>
    </div>
</div>

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pwhash = make_hash(password)

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    return 'PBKDF2${}${}${}${}'.format('sha256',10000,salt,b64encode(pbkdf2_bin(password, salt, 10000, 24,getattr(hashlib, 'sha256'))))
ValueError: zero length field name in format