exemplo de assinatura de XML

ass_xml.py

@@ -0,0 +1,16 @@
+from lxml import etree
+import signxml
+from signxml import xmldsig
+
+cert = open("cert.pem").read()
+key = open("key.pem", "rb").read()
+
+root = etree.parse('texte.xml').getroot()
+signer = xmldsig(root, digest_algorithm="sha1")
+signer.sign(method=signxml.methods.enveloped, key=key, cert=cert,
+            algorithm="rsa-sha1", c14n_algorithm='http://www.w3.org/TR/2001/REC-xml-c14n-20010315',
+            reference_uri='#NFe41150715380524000122651010000000271333611649')
+#verified_data = signer.verify(require_x509=True, ca_pem_file="cert.pem")
+e = etree.tostring(signer.data)
+open("testesig.xml", "wb").write(e)
+