NAME

       dnssec-dsfromkey - DNSSEC DS RR generation tool

SYNOPSIS

       dnssec-dsfromkey [ -1 | -2 | -a alg ] [ -C ] [-T TTL] [-v level] [-K directory] {keyfile}

       dnssec-dsfromkey [ -1 | -2 | -a alg ] [ -C ] [-T TTL] [-v level] [-c class] [-A] {-f file}
       [dnsname]

       dnssec-dsfromkey [ -1 | -2 | -a alg ] [ -C ] [-T TTL] [-v level] [-c class] [-K directory]
       {-s} {dnsname}

       dnssec-dsfromkey [ -h | -V ]

DESCRIPTION

       The dnssec-dsfromkey command outputs DS (Delegation Signer) resource records (RRs), or CDS
       (Child DS) RRs with the -C option.

       By default, only KSKs are converted (keys with flags = 257).  The -A option includes  ZSKs
       (flags = 256).  Revoked keys are never included.

       The input keys can be specified in a number of ways:

       By default, dnssec-dsfromkey reads a key file named in the format Knnnn.+aaa+iiiii.key, as
       generated by dnssec-keygen.

       With the -f file option, dnssec-dsfromkey reads keys from a zone file or partial zone file
       (which can contain just the DNSKEY records).

       With  the  -s option, dnssec-dsfromkey reads a keyset- file, as generated by dnssec-keygen
       -C.

OPTIONS

       -1     This option is an abbreviation for -a SHA1.

       -2     This option is an abbreviation for -a SHA-256.

       -a algorithm
              This option specifies a digest algorithm to use when converting DNSKEY  records  to
              DS  records.  This  option can be repeated, so that multiple DS records are created
              for each DNSKEY record.

              The algorithm must  be  one  of  SHA-1,  SHA-256,  or  SHA-384.  These  values  are
              case-insensitive,  and the hyphen may be omitted. If no algorithm is specified, the
              default is SHA-256.

       -A     This option indicates that ZSKs are to be  included  when  generating  DS  records.
              Without  this  option,  only  keys  which have the KSK flag set are converted to DS
              records and printed. This option is only useful in -f zone file mode.

       -c class
              This option specifies the DNS class; the default is IN. This option is only  useful
              in -s keyset or -f zone file mode.

       -C     This option generates CDS records rather than DS records.

       -f file
              This  option  sets  zone  file  mode,  in  which  the  final  dnsname  argument  of
              dnssec-dsfromkey is the DNS domain name of a zone whose master  file  can  be  read
              from file. If the zone name is the same as file, then it may be omitted.

              If  file  is  -,  then the zone data is read from the standard input. This makes it
              possible to use the output of the dig command as input, as in:

              dig dnskey example.com | dnssec-dsfromkey -f - example.com

       -h     This option prints usage information.

       -K directory
              This option tells BIND 9 to look for key files or keyset- files in directory.

       -s     This option  enables  keyset  mode,  in  which  the  final  dnsname  argument  from
              dnssec-dsfromkey is the DNS domain name used to locate a keyset- file.

       -T TTL This option specifies the TTL of the DS records. By default the TTL is omitted.

       -v level
              This option sets the debugging level.

       -V     This option prints version information.

EXAMPLE

       To  build  the SHA-256 DS RR from the Kexample.com.+003+26160 keyfile, issue the following
       command:

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

       The command returns something similar to:

       example.com.             IN             DS             26160              5              2
       3A1EADA7A74B8D0BA86726B0C227AA85AB8BBD2B2004F41A868A54F0C5EA0B94

FILES

       The  keyfile can be designated by the key identification Knnnn.+aaa+iiiii or the full file
       name Knnnn.+aaa+iiiii.key, as generated by dnssec-keygen.

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

CAVEAT

       A keyfile error may return "file not found," even if the file exists.

SEE ALSO

       dnssec-keygen(8), dnssec-signzone(8), BIND 9 Administrator Reference Manual, RFC 3658  (DS
       RRs),  RFC  4509  (SHA-256  for  DS RRs), RFC 6605 (SHA-384 for DS RRs), RFC 7344 (CDS and
       CDNSKEY RRs).

AUTHOR

       Internet Systems Consortium

COPYRIGHT

       2022, Internet Systems Consortium