Fix error with TLSA selector 0 (#2)

index.py

@@ -54,8 +54,9 @@ def tlsa_validation(DOMAIN):
             conn = ssl.create_connection((DOMAIN , 443))
             context = ssl.SSLContext(ssl.PROTOCOL_TLSv1_2)
             sock = context.wrap_socket(conn, server_hostname=DOMAIN)
-            cert = ssl.DER_cert_to_PEM_cert(sock.getpeercert(True))
-            cert = cert.encode('ascii') 
+            dercert = sock.getpeercert(True)
+            pemcert = ssl.DER_cert_to_PEM_cert(dercert)
+            cert = pemcert.encode('ascii')         
         except:
             return(False)
 
@@ -68,7 +69,7 @@ def tlsa_validation(DOMAIN):
             raise ValueError("selector type %d not recognized" % selector)
 
         if mtype == "0":
-            hexdata2 = hexdump(certdata)
+            certdata = dercert
         elif mtype == "1":
             hexdata2 = compute_hash(hashlib.sha256, certdata)
         elif mtype == "2":