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#!/usr/bin/python
#
# This example shows how to generate public/private key pair
#
import ldns
algorithm = ldns.LDNS_SIGN_DSA
bits = 512
ldns.ldns_init_random(open("/dev/urandom","rb"), (bits+7)//8)
domain = ldns.ldns_dname("example.")
#generate a new key
key = ldns.ldns_key.new_frm_algorithm(algorithm, bits);
print key
#set owner
key.set_pubkey_owner(domain)
#create the public from the ldns_key
pubkey = key.key_to_rr()
#previous command is equivalent to
# pubkey = ldns.ldns_key2rr(key)
print pubkey
#calculate and set the keytag
key.set_keytag(ldns.ldns_calc_keytag(pubkey))
#build the DS record
ds = ldns.ldns_key_rr2ds(pubkey, ldns.LDNS_SHA1)
print ds
owner, tag = pubkey.owner(), key.keytag()
#write public key to .key file
fw = open("key-%s-%d.key" % (owner,tag), "wb")
pubkey.print_to_file(fw)
#write private key to .priv file
fw = open("key-%s-%d.private" % (owner,tag), "wb")
key.print_to_file(fw)
#write DS to .ds file
fw = open("key-%s-%d.ds" % (owner,tag), "wb")
ds.print_to_file(fw)
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