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Use an OpenSSL key on OpenSSH

OpenSSH can directly use your private keys generated with OpenSSL.

Step 1: Decrypt your private key (if pertinent)

If your private key has been created with a passphrase, you first need to decrypt it:

openssl rsa -in encrypted_key.pkey -out decrypted_key.key

Step 2: Secure the key file

To prevent security threats, apply the appropriate permissions on the key file. Without that, ssh-keygen will refuse to work on the file.

chmod 600 decrypted_key.key

Step 3: Create the public Key

If you want to use your private key to authenticate yourself, you will need to deploy your private key on your SSH server. That's why you will need to generate it using ssh-keygen:

ssh-keygen -f decrypted_key.key -y > decrypted_key.pub

Step 4: Encrypt the private key (optionnal)

You can, if you want, add a passphrase to your ssh key:

ssh-keygen -p -f decrypted_key.key

If your OpenSSH version does not natively support the key, then you will need to run this command anyway, adding a passphrase being optional (you will need to press enter without inputing a passphrase, twice).

See Also