def create_cert(urn, issuer_key=None, issuer_cert=None, intermediate=False):
'''Create a new certificate and return it and the associated keys.
If issuer cert and key are given, they sign the certificate. Otherwise
it is a self-signed certificate.
If intermediate then mark this
as an intermediate CA certificate (can sign).
Certificate URN must be supplied.
CN of the cert will be dotted notation authority.type.name from the URN.
'''
# Note the below throws a ValueError if it wasnt a valid URN
c_urn = URN(urn=urn)
dotted = '%s.%s.%s' % (c_urn.getAuthority(), c_urn.getType(), c_urn.getName())
newgid = GID(create=True, subject=dotted[:64],
urn=urn)
keys = Keypair(create=True)
newgid.set_pubkey(keys)
if intermediate:
# This cert will be able to sign certificates
newgid.set_intermediate_ca(intermediate)
if issuer_key and issuer_cert:
# the given issuer will issue this cert
if isinstance(issuer_key,str):
issuer_key = Keypair(filename=issuer_key)
if isinstance(issuer_cert,str):
issuer_cert = GID(filename=issuer_cert)
newgid.set_issuer(issuer_key, cert=issuer_cert)
newgid.set_parent(issuer_cert)
else:
# create a self-signed cert
newgid.set_issuer(keys, subject=dotted)
newgid.encode()
newgid.sign()
return newgid, keys
