Updated: 2021/Apr/14


DNSSEC-DSFROMKEY(8)                 BIND 9                 DNSSEC-DSFROMKEY(8)



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.

       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
       2021, Internet Systems Consortium



9.16.12                                                    DNSSEC-DSFROMKEY(8)