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openpgp2ssh — translate OpenPGP keys to SSH keys


openpgp2ssh < mykey.gpg

gpg --export $KEYID | openpgp2ssh $KEYID

gpg --export $KEYID | openpgp2pem $KEYID

gpg --export $KEYID | openpgp2spki $KEYID

gpg --export-secret-key $KEYID | openpgp2ssh $KEYID


openpgp2ssh takes an OpenPGP-formatted primary key and associated subkeys on standard input,
and spits out the requested equivalent SSH-style (or PEM-encoded) key on standard output.

If the data on standard input contains no subkeys, you can invoke openpgp2ssh without
arguments. If the data on standard input contains multiple keys (e.g. a primary key and
associated subkeys), you must specify a specific OpenPGP key identifier as the first
argument to indicate which key to export. The key ID is normally the 40 hex digit OpenPGP
fingerprint of the key or subkey desired, but openpgp2ssh will accept as few as the last 8
digits of the fingerprint as a key ID.

If the input contains an OpenPGP RSA public key, it will be converted to the OpenSSH-style
single-line keystring, prefixed with the key type (`ssh-rsa'). This format is suitable
(with minor alterations) for insertion into known_hosts files and authorized_keys files. If
invoked as `openpgp2pem', a PEM-encoded public key will be emitted instead.

If invoked as `openpgp2spki', a PEM-encoded subjectPublicKeyInfo (as defined in the X.509
standard) will be emitted instead.

If the input contains an OpenPGP RSA secret key, it will be converted to the equivalent PEM-
encoded private key.

openpgp2ssh is part of the monkeysphere(7) framework for providing a PKI for SSH.


The keys produced by this process are stripped of all identifying information, including
certifications, self-signatures, etc. This is intentional, since ssh attaches no inherent
significance to these features.

openpgp2ssh will produce output for any requested RSA key. This means, among other things,
that it will happily export revoked keys, unverifiable keys, expired keys, etc. Make sure
you do your own key validation before using this tool!


gpg --export-secret-key $KEYID | openpgp2ssh $KEYID | ssh-add -c /dev/stdin

This pushes the secret key into the active ssh-agent(1). Tools such as ssh(1) which know
how to talk to the ssh-agent(1) can now rely on the key.

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