make certgen.py and mk_cer... example scripts python3-able
diff --git a/examples/mk_simple_certs.py b/examples/mk_simple_certs.py
index 9dfdd2e..a451f95 100644
--- a/examples/mk_simple_certs.py
+++ b/examples/mk_simple_certs.py
@@ -7,11 +7,15 @@
 cakey = createKeyPair(TYPE_RSA, 1024)
 careq = createCertRequest(cakey, CN='Certificate Authority')
 cacert = createCertificate(careq, (careq, cakey), 0, (0, 60*60*24*365*5)) # five years
-open('simple/CA.pkey', 'w').write(crypto.dump_privatekey(crypto.FILETYPE_PEM, cakey))
-open('simple/CA.cert', 'w').write(crypto.dump_certificate(crypto.FILETYPE_PEM, cacert))
+open('simple/CA.pkey', 'w').write(crypto.dump_privatekey(crypto.FILETYPE_PEM, cakey).decode('utf-8')
+)
+open('simple/CA.cert', 'w').write(crypto.dump_certificate(crypto.FILETYPE_PEM, cacert).decode('utf-8')
+)
 for (fname, cname) in [('client', 'Simple Client'), ('server', 'Simple Server')]:
     pkey = createKeyPair(TYPE_RSA, 1024)
     req = createCertRequest(pkey, CN=cname)
     cert = createCertificate(req, (cacert, cakey), 1, (0, 60*60*24*365*5)) # five years
-    open('simple/%s.pkey' % (fname,), 'w').write(crypto.dump_privatekey(crypto.FILETYPE_PEM, pkey))
-    open('simple/%s.cert' % (fname,), 'w').write(crypto.dump_certificate(crypto.FILETYPE_PEM, cert))
+    open('simple/%s.pkey' % (fname,), 'w').write(crypto.dump_privatekey(crypto.FILETYPE_PEM, pkey).decode('utf-8')
+)
+    open('simple/%s.cert' % (fname,), 'w').write(crypto.dump_certificate(crypto.FILETYPE_PEM, cert).decode('utf-8')
+)