DNSSEC-KEYFROMLABEL(1)

NAME
dnssec-keyfromlabel - DNSSEC key generation tool

SYNOPSIS

dnssec-keyfromlabel {-l label} [-3] [-a algorithm] [-A date/offset] [-c class] [-D date/offset] [-D sync date/offset] [-f flag] [-G] [-I date/offset] [-i interval] [-k] [-K directory] [-L ttl] [-M tag_min:tag_max] [-P date/offset] [-P sync date/offset] [-p protocol] [-R date/offset] [-S key] [-v level] [-V] [-y] {name}

DESCRIPTION

dnssec-keyfromlabel generates a pair of key files that reference a key object stored in a cryptographic hardware service module (HSM). The private key file can be used for DNSSEC signing of zone data as if it were a conventional signing key created by dnssec-keygen <#std-iscman-dnssec-keygen>, but the key material is stored within the HSM and the actual signing takes place there.

The name of the key is specified on the command line. This must match the name of the zone for which the key is being generated.

OPTIONS

-a algorithm
    This option selects the cryptographic algorithm. The value of algorithm must be one of RSASHA1 (deprecated), NSEC3RSASHA1 (deprecated), RSASHA256, RSASHA512, ECDSAP256SHA256, ECDSAP384SHA384, ED25519, or ED448.

    These values are case-insensitive. In some cases, abbreviations are supported, such as ECDSA256 for ECDSAP256SHA256 and ECDSA384 for ECDSAP384SHA384. If RSASHA1 (deprecated) is specified along with the -3 option, then NSEC3RSASHA1 (deprecated) is used instead.

    This option is mandatory except when using the -S option, which copies the algorithm from the predecessory key.

    Changed in version 9.12.0: The default value RSASHA1 (deprecated) for newly generated keys was removed.

-3  This option uses an NSEC3-capable algorithm to generate a DNSSEC key. If this option is used with an algorithm that has both NSEC and NSEC3 versions, then the NSEC3 version is used; for example, dnssec-keygen -3a RSASHA1 specifies the NSEC3RSASHA1 (deprecated) algorithm.

-l label
    This option specifies the label for a key pair in the crypto hardware.

    When BIND 9 is built with OpenSSL-based PKCS#11 support, the label is an arbitrary string that identifies a particular key.

-c class
    This option indicates that the DNS record containing the key should have the specified class. If not specified, class IN is used.

-f flag
    This option sets the specified flag in the flag field of the KEY/DNSKEY record. The only recognized flags are KSK (Key-Signing Key) and REVOKE.

-G  This option generates a key, but does not publish it or sign with it. This option is incompatible with -P and -A.

-h  This option prints a short summary of the options and arguments to dnssec-keyfromlabel.

-K directory
    This option sets the directory in which the key files are to be written.

-k  This option generates KEY records rather than DNSKEY records.

-L ttl
    This option sets the default TTL to use for this key when it is converted into a DNSKEY RR. This is the TTL used when the key is imported into a zone, unless there was already a DNSKEY RRset in place, in which case the existing TTL would take precedence. Setting the default TTL to 0 or none removes it.

-M tag_min:tag_max
    This option sets the range of key tag values that dnssec-keyfromlabel will accept. If the key tag of the new key or the key tag of the revoked version of the new key is outside this range, the new key will be rejected. This is designed to be used when generating keys in a multi-signer scenario, where each operator is given a range of key tags to prevent collisions among different operators. The valid values for tag_min and tag_max are [0..65535]. The default allows all key tag values to be accepted.

-S key
    This option generates a key as an explicit successor to an existing key. The name, algorithm, size, and type of the key are set to match the predecessor. The activation date of the new key is set to the inactivation date of the existing one. The publication date is set to the activation date minus the prepublication interval, which defaults to 30 days.

-v level
    This option sets the debugging level.

-V  This option prints version information.

-y  This option allows DNSSEC key files to be generated even if the key ID would collide with that of an existing key, in the event of either key being revoked. (This is only safe to enable if RFC 5011 <https://datatracker.ietf.org/doc/html/rfc5011.html> trust anchor maintenance is not used with either of the keys involved.)

TIMING OPTIONS

Dates can be expressed in the format YYYYMMDD or YYYYMMDDHHMMSS (which is the format used inside key files), or 'Day Mon DD HH:MM:SS YYYY' (as printed by dnssec-settime -p), or UNIX epoch time (as printed by dnssec-settime -up), or the literal now.

The argument can be followed by + or - and an offset from the given time. The literal now can be omitted before an offset. The offset can be followed by one of the suffixes y, mo, w, d, h, or mi, so that it is computed in years (defined as 365 24-hour days, ignoring leap years), months (defined as 30 24-hour days), weeks, days, hours, or minutes, respectively. Without a suffix, the offset is computed in seconds.

To explicitly prevent a date from being set, use none, never, or unset.

All these formats are case-insensitive.

-P date/offset
    This option sets the date on which a key is to be published to the zone. After that date, the key is included in the zone but is not used to sign it. If not set, and if the -G option has not been used, the default is the current date.

sync date/offset
    This option sets the date on which CDS and CDNSKEY records that match this key are to be published to the zone.

-A date/offset
    This option sets the date on which the key is to be activated. After that date, the key is included in the zone and used to sign it. If not set, and if the -G option has not been used, the default is the current date.

-R date/offset
    This option sets the date on which the key is to be revoked. After that date, the key is flagged as revoked. It is included in the zone and is used to sign it.

-I date/offset
    This option sets the date on which the key is to be retired. After that date, the key is still included in the zone, but it is not used to sign it.

-D date/offset
    This option sets the date on which the key is to be deleted. After that date, the key is no longer included in the zone. (However, it may remain in the key repository.)

sync date/offset
    This option sets the date on which the CDS and CDNSKEY records that match this key are to be deleted.

-i interval
    This option sets the prepublication interval for a key. If set, then the publication and activation dates must be separated by at least this much time. If the activation date is specified but the publication date is not, the publication date defaults to this much time before the activation date; conversely, if the publication date is specified but not the activation date, activation is set to this much time after publication.

    If the key is being created as an explicit successor to another key, then the default prepublication interval is 30 days; otherwise it is zero.

    As with date offsets, if the argument is followed by one of the suffixes y, mo, w, d, h, or mi, the interval is measured in years, months, weeks, days, hours, or minutes, respectively. Without a suffix, the interval is measured in seconds.

GENERATED KEY FILES

When dnssec-keyfromlabel completes successfully, it prints a string of the form Knnnn.+aaa+iiiii to the standard output. This is an identification string for the key files it has generated.

•   nnnn is the key name.

•   aaa is the numeric representation of the algorithm.

•   iiiii is the key identifier (or footprint).

    dnssec-keyfromlabel creates two files, with names based on the printed string. Knnnn.+aaa+iiiii.key contains the public key, and Knnnn.+aaa+iiiii.private contains the private key.

    The .key file contains a DNS KEY record that can be inserted into a zone file (directly or with an $INCLUDE statement).

    The .private file contains algorithm-specific fields. For obvious security reasons, this file does not have general read permission.

SEE ALSO

dnssec-keygen(8) <#std-iscman-dnssec-keygen>, dnssec-signzone(8) <#std-iscman-dnssec-signzone>, BIND 9 Administrator Reference Manual, RFC 4034 <https://datatracker.ietf.org/doc/html/rfc4034.html>, RFC 7512 <https://datatracker.ietf.org/doc/html/rfc7512.html>.

Author
Internet Systems Consortium

Copyright
2026, Internet Systems Consortium