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ldns-keygen - Man Page

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-md5.sig-alg.reg.int, 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>


-a <algorithm>

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.

-b <bits>

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.

-r device

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


ldns-keygen will create symbolic links named .private to the new generated private key, .key to the public DNSKEY and .ds to the file containing DS record data.


force symlinks to be overwritten if they exist.


Show the version and exit


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

Reporting Bugs

Report bugs to <ldns-team@nlnetlabs.nl>.


27 May 2008