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openssh-key-parser

C# parser for private keys in the OpenSSH file format (i.e. openssh-key-v1).

The following key types are supported

  • ssh-ed25519
  • ssh-rsa
  • ssh-dss (DSA)
  • ecdsa-sha2-nistp256
  • ecdsa-sha2-nistp384
  • ecdsa-sha2-nistp521

Example usage:

var keyPair = (Ed25519KeyPair)OpenSshKeyParser.ParseOpenSshKeyFile(
	System.IO.File.ReadAllText(@"E:\keys\ed25519_with_passphrase"), "password");

The format for openssh-key-v1 is documented here. But to be honest, this doesn't quite give you all you need. I looked quite a bit at how the sshj library parses these keys and a extracting a key/iv from the KDF was directly ported from sshj. The crypto stuff like Bcrypt and ae256-ctr were used from existing sources. I used a little code from ssh.net on reading the binary data from the keyfile. Finally, I owe picking the parts from ECDSA keys to this ssh.net fork.