NAME
dkim-genkey - DKIM filter key generation tool
SYNOPSIS
dkim-genkey [options]
DESCRIPTION
dkim-genkey generates (1) a private key for signing messages using
dkim-filter(8) and (2) a DNS TXT record suitable for inclusion in a
zone file which publishes the matching public key for use by remote
DKIM verifiers.
The filenames of these are based on the selector (see below); the
private key will have a suffix of ".private" and the TXT record will
have a suffix of ".txt".
OPTIONS
-b bits
Specifies the size of the key, in bits, to be generated. The
default is 1024 which is the value recommended by the DKIM
specification.
-d domain
Names the domain which will use this key for signing. Currently
only used in a comment in the TXT record file. The default is
"example.com".
-D directory
Instructs the tool to change to the named directory prior to
creating files. By default the current directory is used.
-g granularity
Defines the key granularity, i.e. the user(s) who may use the
key. The default is "*" meaning any user can use the key.
-h algorithms
Specifies a list of hash algorithms which can be used with this
key. By default all hash algorithms are allowed.
-n note
Includes arbitrary note text in the key record. By default, no
such text is included.
-r Restricts the key for use in e-mail signing only. The default
is to allow the key to be used for any service.
-s selector
Specifies the selector, or name, of the key pair generated. The
default is "default".
-S Disallows subdomain signing by this key. By default the key
record will be generated such that verifiers are told subdomain
signing is permitted.
-t Indicates the generated key record should be tagged such that
verifiers are aware DKIM is in test at the signing domain.
NOTES
Requires that the openssl(8) binary be installed and in the executing
shell’s search path.
VERSION
This man page covers the version of dkim-genkey that shipped with
version 2.8.0 of dkim-filter.
COPYRIGHT
Copyright (c) 2007, 2008 Sendmail, Inc. and its suppliers. All rights
reserved.
SEE ALSO
dkim-filter(8), openssl(8)
RFC4871 - DomainKeys Identified Mail
Sendmail, Inc. dkim-genkey(8)