openssh_pk_to_RSA_PK.md

Convert OpenSSH Private Key to RSA Private Key

Your OpenSSH Private Key looks like this

-----BEGIN OPENSSH PRIVATE KEY-----
b34ahC
-----END OPENSSH PRIVATE KEY-----

First, backup your OpenSSH Private Key

$ cp server_ssh.key server_ssh.key.backup

Convert to RSA Private Key

$ ssh-keygen -p -N "" -m pem -f server_ssh.key

Now your server_ssh.key looks like this

-----BEGIN RSA PRIVATE KEY-----
b34ahC
-----END RSA PRIVATE KEY-----

Error

permissions 0644 for are too open

The keys need to be read-writable only by you

$ chmod 600 server_ssh.key

Failed to load key idrsa_data: invalid format

Add new line to the server_ssh.key

Tk3AQIDBAUGBw==
-----END OPENSSH PRIVATE KEY----- (press Enter button here, to add new line)

CRLF

Replace CRLF to LF

$ sed 's/\r$//' server_ssh.key > server_ssh_backup.key