diff --git a/trytond/backend/fields.py b/trytond/backend/fields.py
index 5e2677b027..7f6cf19c9f 100644
--- a/trytond/backend/fields.py
+++ b/trytond/backend/fields.py
@@ -2,11 +2,7 @@
 #this repository contains the full copyright notices and license terms.
 import datetime
 from decimal import Decimal
-try:
-    import hashlib
-except ImportError:
-    hashlib = None
-    import sha
+import hashlib
 
 
 class Field(object):
@@ -54,10 +50,7 @@ class Sha(Field):
         if value is not None:
             if isinstance(value, unicode):
                 value = value.encode('utf-8')
-            if hashlib:
-                value = hashlib.sha1(value).hexdigest()
-            else:
-                value = sha.new(value).hexdigest()
+            value = hashlib.sha1(value).hexdigest()
         return Char.sql_format(value)
 
 
diff --git a/trytond/protocols/dispatcher.py b/trytond/protocols/dispatcher.py
index b2d1ecbe6b..3bb21c260e 100644
--- a/trytond/protocols/dispatcher.py
+++ b/trytond/protocols/dispatcher.py
@@ -5,11 +5,7 @@ import traceback
 import logging
 import time
 import sys
-try:
-    import hashlib
-except ImportError:
-    hashlib = None
-    import sha
+import hashlib
 import pydoc
 from trytond.pool import Pool
 from trytond import security
@@ -236,10 +232,7 @@ def create(database_name, password, lang, admin_password):
                         cursor.limit_clause('SELECT id FROM ir_lang ' \
                         'WHERE code = %s', 1) + ')' \
                     'WHERE login <> \'root\'', (lang,))
-            if hashlib:
-                admin_password = hashlib.sha1(admin_password).hexdigest()
-            else:
-                admin_password = sha.new(admin_password).hexdigest()
+            admin_password = hashlib.sha1(admin_password).hexdigest()
             cursor.execute('UPDATE res_user ' \
                     'SET password = %s ' \
                     'WHERE login = \'admin\'', (admin_password,))
diff --git a/trytond/res/user.py b/trytond/res/user.py
index 3d6d4eea7f..6825a4416b 100644
--- a/trytond/res/user.py
+++ b/trytond/res/user.py
@@ -4,11 +4,7 @@
 import copy
 import string
 import random
-try:
-    import hashlib
-except ImportError:
-    hashlib = None
-    import sha
+import hashlib
 import time
 import datetime
 from itertools import groupby, ifilter
@@ -460,10 +456,7 @@ class User(ModelSQL, ModelView):
         password += salt or ''
         if isinstance(password, unicode):
             password = password.encode('utf-8')
-        if hashlib:
-            password_sha = hashlib.sha1(password).hexdigest()
-        else:
-            password_sha = sha.new(password).hexdigest()
+        password_sha = hashlib.sha1(password).hexdigest()
         cursor = Transaction().cursor
         if password_sha == user_password:
             cursor.execute('UPDATE "' + cls._table + '" '
diff --git a/trytond/server.py b/trytond/server.py
index ff71446575..13f5948d77 100644
--- a/trytond/server.py
+++ b/trytond/server.py
@@ -11,11 +11,7 @@ import signal
 import time
 from trytond.config import CONFIG
 from getpass import getpass
-try:
-    import hashlib
-except ImportError:
-    hashlib = None
-    import sha
+import hashlib
 import threading
 import string
 import random
@@ -169,10 +165,7 @@ class TrytonServer(object):
                     salt = ''.join(random.sample(
                         string.letters + string.digits, 8))
                     password += salt
-                    if hashlib:
-                        password = hashlib.sha1(password).hexdigest()
-                    else:
-                        password = sha.new(password).hexdigest()
+                    password = hashlib.sha1(password).hexdigest()
                     cursor.execute('UPDATE res_user ' \
                             'SET password = %s, salt = %s ' \
                             'WHERE login = \'admin\'', (password, salt))