## Name

dnssec-dsfromkey — DNSSEC DS RR generation tool

## Synopsis

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

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

## DESCRIPTION

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

## OPTIONS

-1

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

-2

  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.

-s

  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.

## EXAMPLE

To build the SHA-256 DS RR from the `Kexample.com.+003+26160` keyfile name, the following command would be issued:

`dnssec-dsfromkey -2 Kexample.com.+003+26160`

The command would print something like:

`example.com. IN DS 26160 5 2 3A1EADA7A74B8D0BA86726B0C227AA85AB8BBD2B2004F41A868A54F0 C5EA0B94`

## FILES

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`.

## CAVEAT

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

## SEE ALSO

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

## AUTHOR

Internet Systems Consortium