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artizirk/id_rsa to pem converting.md

Last active January 20, 2024 10:37
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Converting openssh private key format to pem
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id_rsa to pem converting.md

Converting openssh private key format to pem

man page says that you can use -e option to convert private and public keys to other formats, that seems to be wrong. Instead you can use -p option to request changing the password but not actually setting the password.

ssh-keygen -p -f id_rsa -m pem

Converting pem to OpenPGP

Monkeysphere project includes a pem2openpgp command that can be used to import ssh private keys to gnupg keyring.

PEM2OPENPGP_USAGE_FLAGS=authenticate pem2openpgp 'ssh id_rsa' < id_rsa | gpg --import

After importing you can use normal gpg --edit-key command to change parameters on this key. GnuPG 2.1 also allows you to move the imported key to be one of your subkeys for authentication. https://security.stackexchange.com/a/160847

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