#Convert putty key to openssh password#
#Convert putty key to openssh windows#

And as you can see in man page, you have no choice for puttygen in Ed25519.Īfter some struggling, now I just use key made with puttygen but I'm afraid I cannot get benefit of KDF. You may try ssh-keygen with -o option to rsa or dsa type private key and see puttygen also cannot parse these either. we need to convert the private key into ppk format which is supported by Putty Tool. If you directly try to use that key with Putty to connect to the VM machine, you will get a failure. Generally, the keys will be in OpenSSH format. Searching further detail about new format using bcrypt KDF could be start in this link: Many times, you get the private key from the cloud provider to connect to the Virtual machine. The new format encrypt private key file a few times (usually about 100 times) with key deriviation function(KDF) for making decrypting slow. Ed25519 keys always use the new private key format.

#Convert putty key to openssh password#

To brute-force password cracking but is not supported by versions of OpenSSH o Causes ssh-keygen to save private keys using the new OpenSSH format rather The following is what man ssh-keygen shows about -o option. It does happen because of new openssh format. ssh/id_ed25519)Īctually this Problem does not deal with Ed25519 itself.

#Convert putty key to openssh windows#

Ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIIJiwIymcly4s66pza/I元ZNyT5CiMPj0R+/LnMDmABU Run puttygen.exe on windows and try to import the ed25519 private key (. T3bUCtdwhHLaLqy9unw0zPHlfcQsB700GS/bf4VKRmm1+imj3cAldUm2RF3VdI0U9/04yX ZGB7iRhNUXT+isPdf0YuC9mh5NbX43ZYFl+/sWdi2hVmJxbGTwrjaSdNzF3ZnSpi/aVlzF Za/I元ZNyT5CiMPj0R+/LnMDmABUAAAAoMJIakdbIL7TOAmX8n4xGSrtp8mc/Mr6qimZAZ G8CQYpo/0c7UShAAAAZAAAAAEAAAAzAAAAC3NzaC1lZDI1NTE5AAAAIIJiwIymcly4s66p SHA256:2HfORujStwmC9c91rmDxMbaV9kVMT70gWxnRXAvNrNU key's randomart image is:ī3BlbnNzaC1rZXktdjEAAAAACmFlczI1Ni1jdHIAAAAGYmNyeXB0AAAAGAAAABClhk1367 Your public key has been saved in /root/.ssh/id_ed25519.pub. Your identification has been saved in /root/.ssh/id_ed25519. Generating public/private ed25519 key pair.Įnter file in which to save the key (/root/.ssh/id_ed25519):Įnter passphrase (empty for no passphrase): Generate an ed25519 private key # ssh-keygen -t ed25519 -a 100 Tested putty version: 0.70 64bit, 0.70 32bit and snapshot (on windows 10) Tested openssh version: OpenSSH_7.6p1, OpenSSL 1.1.0g and OpenSSH_7.6p1, OpenSSL 1.0.2n (on CoreOS and ArchLinux docker container)

But I got the error.Ĭouldn't load private key (unrecognized cipher name) I want to convert an ed25519 private key (which is generated by ssh-keygen command) to a ppk file.