diff --git a/source/cfdi_cert.py b/source/cfdi_cert.py
index 2dc1f58..c071ab9 100644
--- a/source/cfdi_cert.py
+++ b/source/cfdi_cert.py
@@ -132,7 +132,7 @@ class CertValidate(object):
     def issuer(self):
         return self._issuer
 
-    def _get_data_cer(self, cer):
+    def get_data_cer(self, cer: bytes):
         obj = x509.load_der_x509_certificate(cer, default_backend())
         self._rfc = obj.subject.get_attributes_for_oid(
             NameOID.X500_UNIQUE_IDENTIFIER)[0].value.split(' ')[0]
@@ -193,7 +193,7 @@ class CertValidate(object):
         return key_pem
 
     def validate(self, cer: bytes, key: bytes, password: str) -> bool:
-        self._get_data_cer(cer)
+        self.get_data_cer(cer)
         self._get_data_key(key, password)
         return self.is_valid
 
@@ -210,6 +210,10 @@ class CertSign(object):
             pw = get_hash(words)
         self._key = serialization.load_pem_private_key(key_file, pw, default_backend())
 
+    def get_data_cer(self, cer: bytes):
+        cer = CertValidate().get_data_cer(cer)
+        return cer
+
     def sign(self, data, type_hash: str='sha256'):
         if isinstance(data, str):
             data = data.encode()
diff --git a/source/tests/test.py b/source/tests/test.py
index a50b15b..d344289 100644
--- a/source/tests/test.py
+++ b/source/tests/test.py
@@ -100,7 +100,6 @@ class TestCertValidate(BaseTest):
         key = path_key.read_bytes()
 
         result = cert.validate(cer, key, PASSWORD)
-        # ~ print(cert)
 
         self.assertTrue(result)
         return