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ldns-keygen(1) General Commands Manual ldns-keygen(1)


ldns-keygen - generate a DNSSEC key pair


ldns-keygen [ OPTION ] DOMAIN


ldns-keygen is used to generate a private/public keypair. When run, it will create 3 files; a .key file with the public DNSKEY, a .private file with the private keydata and a .ds with the DS record of the DNSKEY record.

ldns-keygen can also be used to create symmetric keys (for TSIG) by selecting the appropriate algorithm:, hmac-sha1, hmac-sha224, hmac-sha256, hmac-sha384 or hmac-sha512. In that case no DS record will be created and no .ds file.

ldns-keygen prints the basename for the key files: K<name>+<alg>+<id>


Create a key with this algorithm. Specifying 'list' here gives a list of supported algorithms. Several alias names are also accepted (from older versions and other software), the list gives names from the RFC. Also the plain algo number is accepted.

Use this many bits for the key length.

When given, generate a key signing key. This just sets the flag field to 257 instead of 256 in the DNSKEY RR in the .key file.

Make ldns-keygen use this file to seed the random generator with. This will default to /dev/random.

Show the version and exit


Written by the ldns team as an example for ldns usage.


Report bugs to <>.


Copyright (C) 2005-2008 NLnet Labs. This is free software. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

27 May 2008