diff --git a/gestion/cert_utils.py b/gestion/cert_utils.py
new file mode 100644
index 00000000..32b64913
--- /dev/null
+++ b/gestion/cert_utils.py
@@ -0,0 +1,201 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+from OpenSSL import crypto, SSL
+from socket import gethostname
+from pprint import pprint
+import time
+from os.path import exists, join
+
+def crt_import(str):
+    return crypto.load_certificate(crypto.FILETYPE_PEM, open(str).read())
+
+def key_import(str):
+    return crypto.load_privatekey(crypto.FILETYPE_PEM, open(str).read())
+
+def crt_write(crt, file):
+    open(file, "wt").write(
+        crypto.dump_certificate(crypto.FILETYPE_PEM, crt))
+
+def key_write(key, file, cipher=None, passphrase=None):
+    open(file, "wt").write(
+        crypto.dump_privatekey(crypto.FILETYPE_PEM, key, cipher, passphrase) if cipher else crypto.dump_privatekey(crypto.FILETYPE_PEM, key))
+
+def write((cert, key), cert_dir="."):
+    common_name = cert.get_subject().CN
+    CERT_FILE = "%s.crt" % common_name
+    KEY_FILE = "%s.key" % common_name
+    C_F = join(cert_dir, CERT_FILE)
+    K_F = join(cert_dir, KEY_FILE)
+    if not exists(C_F) or not exists(K_F):
+        crt_write(cert,C_F)
+        key_write(key,K_F)
+    else:
+         print "Les fichiers %s et %s existent déjà" % (C_F, K_F)
+
+def crl_gen(crl=None, add_crt=[]):
+    if not crl:
+        crl=crypto.CRL()
+    for crt in add_crt:
+        revoked = crypto.Revoked()
+        revoked.set_serial(hex(crt.get_serial_number()))
+        crl.add_revoked(revoked)
+    return crl
+
+def crl_export(crl, (ca_cert, ca_key)):
+    return crl.export(ca_cert, ca_key)
+
+def crt_create(
+  common_name,
+  params={},
+  not_after=365*24*3600,
+  size=4096,
+  key=None,
+  parent=None,
+  extentions=[]
+  ):
+    """
+@param parent: tuple (X509 certificate, private key)
+@return: (X509 certificate, private key)
+"""
+    params["CN"] = common_name # common name
+    params.setdefault("C", "FR") # country
+    params.setdefault("ST", "Val de Marne") # state
+    params.setdefault("L", "Cachan") # city
+    params.setdefault("O", "Association CRANS") # organization
+    params.setdefault("OU", "") # organization unit
+
+    if not key:
+        # create a key pair
+        k = crypto.PKey()
+        k.generate_key(crypto.TYPE_RSA, size)
+    else:
+        k = key
+    if k.bits() != size:
+        raise ValueError("Key of %s bits but requesting %s bits" % (k.bits, size))
+
+    # create a certificate
+    cert = crypto.X509()
+    cert.get_subject().C = params["C"]
+    cert.get_subject().ST = params["ST"]
+    cert.get_subject().L = params["L"]
+    cert.get_subject().O = params["O"]
+    if params["OU"]:
+        cert.get_subject().OU = params["OU"]
+    cert.get_subject().CN = params["CN"]
+
+    cert.set_serial_number(int((time.time() - 1386340000)*100))
+    cert.gmtime_adj_notBefore(0)
+    cert.gmtime_adj_notAfter(not_after)
+    cert.set_pubkey(k)
+    cert.add_extensions(extentions)
+    if parent:
+        cert.set_issuer(parent[0].get_subject())
+        cert.sign(parent[1], 'sha1')
+    else:
+        cert.set_issuer(cert.get_subject())
+        cert.sign(k, 'sha1')
+    
+    return (cert, k)
+
+
+def crt_ca_root_create(
+  common_name,
+  params={},
+  size=4096,
+  key=None,
+  not_after=365*24*3600*10,
+  ):
+  extentions=[
+    crypto.X509Extension("basicConstraints", True, "CA:TRUE"),
+    crypto.X509Extension("keyUsage", True, "keyCertSign, cRLSign"),
+  ]
+  return crt_create(
+  common_name,
+  params,
+  not_after,
+  size,
+  key,
+  extentions=extentions
+  )
+
+
+def crt_ca_subroot_create(
+  common_name,
+  parent,
+  params={},
+  size=4096,
+  key=None,
+  not_after=365*24*3600*10,
+  ):
+  extentions=[
+    crypto.X509Extension("basicConstraints", True, "CA:TRUE, pathlen:0"),
+    crypto.X509Extension("keyUsage", True, "keyCertSign, cRLSign"),
+  ]
+  return crt_create(
+  common_name,
+  params,
+  not_after,
+  size,
+  key,
+  parent=parent,
+  extentions=extentions
+  )
+
+def crt_client_create(
+  common_name,
+  parent,
+  params={},
+  size=4096,
+  key=None,
+  not_after=365*24*3600,
+  alt_names=[]
+  ):
+  extentions=[
+    crypto.X509Extension("basicConstraints", True, "CA:FALSE"),
+    crypto.X509Extension("keyUsage", True, "digitalSignature, nonRepudiation, keyEncipherment"),
+    crypto.X509Extension("nsCertType", True, "sslCA"),
+    crypto.X509Extension("extendedKeyUsage", True, "clientAuth"),
+#    crypto.X509Extension("crlDistributionPoints", False, "URI:http://myhost.com/myca.crl"),
+  ]
+  for name in alt_names:
+      extentions.append(crypto.X509Extension("subjectAltName", True, "%s" % name))
+  return crt_create(
+  common_name,
+  params,
+  not_after,
+  size,
+  key,
+  parent=parent,
+  extentions=extentions
+  )
+
+
+def createCertRequest(pkey, digest="sha1", subjectAltName=[], **name):
+    """
+    Create a certificate request.
+    Arguments: pkey   - The key to associate with the request
+               digest - Digestion method to use for signing, default is md5
+               **name - The name of the subject of the request, possible
+                        arguments are:
+                          C     - Country name
+                          ST    - State or province name
+                          L     - Locality name
+                          O     - Organization name
+                          OU    - Organizational unit name
+                          CN    - Common name
+                          emailAddress - E-mail address
+    Returns:   The certificate request in an X509Req object
+    """
+    req = crypto.X509Req()
+    subj = req.get_subject()
+    for (key,value) in name.items():
+        setattr(subj, key, value)
+    if subjectAltName:
+        exts = []
+        for altName in subjectAltName:
+            exts.append(crypto.X509Extension("subjectAltName", True, "DNS:%s" % altName))
+        req.add_extensions(exts)
+    req.set_pubkey(pkey)
+    req.sign(pkey, digest)
+    return req
+