DESCRIPTIONdkim-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".
- -b bits
Specifies the size of the key, in
to be generated. The default is 1024 which is the value recommended by
the DKIM specification.
- -d 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
prior to creating files. By default the current directory is used.
- -g granularity
Defines the key
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
which can be used with this key. By default all hash algorithms are allowed.
- -n note
text in the key record. By default, no such text is included.
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
or name, of the key pair generated. The default is "default".
Disallows subdomain signing by this key. By default the key record will be
generated such that verifiers are told subdomain signing is permitted.
- Indicates the generated key record should be tagged such that verifiers are aware DKIM is in test at the signing domain.