dnssec-dsfromkey — DNSSEC DS RR generation tool


dnssec-dsfromkey [-v level] [-1] [-2] [-a alg] {keyfile}

dnssec-dsfromkey {-s} [-v level] [-1] [-2] [-a alg] [-c class] [-d dir] {dnsname}


dnssec-dsfromkey outputs the Delegation Signer (DS) resource record (RR), as defined in RFC 3658 and RFC 4509, for the given key(s).



Use SHA-1 as the digest algorithm (the default is to use both SHA-1 and SHA-256).


Use SHA-256 as the digest algorithm.

-a algorithm

Select the digest algorithm. The value of algorithm must be one of SHA-1 (SHA1) or SHA-256 (SHA256). These values are case insensitive.

-v level

Sets the debugging level.


Keyset mode: in place of the keyfile name, the argument is the DNS domain name of a keyset file. Following options make sense only in this mode.

-c class

Specifies the DNS class (default is IN), useful only in the keyset mode.

-d directory

Look for keyset files in directory as the directory, ignored when not in the keyset mode.


To build the SHA-256 DS RR from the keyfile name, the following command would be issued:

dnssec-dsfromkey -2

The command would print something like: IN DS 26160 5 2 3A1EADA7A74B8D0BA86726B0C227AA85AB8BBD2B2004F41A868A54F0 C5EA0B94


The keyfile can be designed by the key identification Knnnn.+aaa+iiiii or the full file name Knnnn.+aaa+iiiii.key as generated by dnssec-keygen(8).

The keyset file name is built from the directory, the string keyset- and the dnsname.


A keyfile error can give a "file not found" even if the file exists.


dnssec-keygen(8), dnssec-signzone(8), BIND 9 Administrator Reference Manual, RFC 3658, RFC 4509.


Internet Systems Consortium