Dropbear is a replacement for standard OpenSSH for environments with low memory and processor resources. With OpenSSH, you can use the well-known
ssh-keyen command to create a private/public keypair for the client. In Dropbear, it is a bit different. Here are the commands on the client:
mkdir ~/.ssh chmod 700 ~/.ssh/ dropbearkey -t rsa -f ~/.ssh/id_dropbear
Both private and public keys will be in
~/.ssh/id_dropbear, however in a binary format.
To output the public key to
stdout in the usual SSH-compatible format, use:
dropbearkey -y -f ~/.ssh/id_dropbear