From b6a9acb8bae06bc8c764c572aaefadb06504e54f Mon Sep 17 00:00:00 2001
From: Mauricio Baeza <elmau@correolibre.net>
Date: Fri, 16 Jul 2021 15:34:45 -0500
Subject: [PATCH] Fix issue #1

---
 CHANGELOG.md            | 5 +++++
 VERSION                 | 2 +-
 source/sat/cfdi_cert.py | 6 +++++-
 3 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0da8b07..10f6d5e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,11 @@
 # Lista de cambios
 
 
+## v 0.2.1 [16-Jul-21]
+---
+* Fix - Issue #1
+
+
 ## v 0.2.0 [15-Jul-21]
 ---
 * Se agrega la posibilidad de firmar con fiel en formato PEM
diff --git a/VERSION b/VERSION
index 0ea3a94..0c62199 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-0.2.0
+0.2.1
diff --git a/source/sat/cfdi_cert.py b/source/sat/cfdi_cert.py
index 9fe9cbd..ec1937f 100644
--- a/source/sat/cfdi_cert.py
+++ b/source/sat/cfdi_cert.py
@@ -19,7 +19,7 @@ from conf import TOKEN
 
 class SATCertificate(object):
 
-    def __init__(self, cer=b'', key=b'', pem='', password=''):
+    def __init__(self, cer=b'', key=b'', pem=b'', password=''):
         self._error = ''
         self._init_values()
         self._get_data_cer(cer)
@@ -38,6 +38,7 @@ class SATCertificate(object):
         self._cer_pem = ''
         self._cer_txt = ''
         self._key_enc = b''
+        self._key_pem = b''
         self._p12 = b''
         self._cer_modulus = 0
         self._key_modulus = 0
@@ -133,6 +134,9 @@ class SATCertificate(object):
         return key_pem
 
     def _get_data_pem(self, pem):
+        if not pem:
+            return
+
         self._key_pem = serialization.load_pem_private_key(
             pem, None, backend=default_backend())
         return