C#•3mo ago

Generate RSA keypairs with passphrase for SSH.NET

I need to create a key pair which can be used by the renci.sshnet library to connect to a ssh server (after I would copy the public key). I tried using https://github.com/ShawInnes/SshKeyGenerator, but this library doesn't seem to support passphrases. I also don't want to store the keys in files. I also couldn't get https://github.com/darinkes/SshNet.Keygen to work, which would support passphrases.

18 Replies

Pobiega•3mo ago

Where are you gonna store the keys, if not in files?

iHouqLF•3mo ago

In a variable

Pobiega•3mo ago

that seems awfully temporary are you gonna be re-generating keys every time the app starts?

iHouqLF•3mo ago

I'm trying to build a program that connects to a ssh server, swaps out a key (~/.ssh/authorized_keys), then stores the key encrypted in a database For that, it has to generate a new key pair

Pobiega•3mo ago

var keyInfo = new SshKeyGenerateInfo { Encryption = new SshKeyEncryptionAes256("my passphrase") };
var privateKey = SshKey.Generate(keyInfo);
var publicKey = privateKey.ToPublic();
var fingerprint = privateKey.Fingerprint();

Console.WriteLine($"Fingerprint: {fingerprint}");

var keyInfo = new SshKeyGenerateInfo { Encryption = new SshKeyEncryptionAes256("my passphrase") };
var privateKey = SshKey.Generate(keyInfo);
var publicKey = privateKey.ToPublic();
var fingerprint = privateKey.Fingerprint();

Console.WriteLine($"Fingerprint: {fingerprint}");

this seems fine.. SshNet.Keygen. Its only in pre-release and requires the 2022 version of SshNet, but it seems to work

iHouqLF•3mo ago

thanks, but where can I find the 2022 version of Ssh.net?

Pobiega•3mo ago

Just install the keygen and it gives you sshnet transatively

Unknown User•3mo ago

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Pobiega•3mo ago

Because the keygen package internally depends on it And seems a little so-so maintained

Unknown User•3mo ago

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Pobiega•3mo ago

That screenshot shows sshnet itself, not sshnet.keygen

Unknown User•3mo ago

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iHouqLF•3mo ago

I'm trying to use a newer version ssh.net but I get this error. It would be important that I can use the newer version of ssh.net Is it somehow possible that I can use both versions? The old version for sshnet.keygen and the new version for connections?

Unknown User•3mo ago

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iHouqLF•3mo ago

but then my other code doesn't work anymore

MODiX•3mo ago

Pobiega

var keyInfo = new SshKeyGenerateInfo { Encryption = new SshKeyEncryptionAes256("my passphrase") };
var privateKey = SshKey.Generate(keyInfo);
var publicKey = privateKey.ToPublic();
var fingerprint = privateKey.Fingerprint();

Console.WriteLine($"Fingerprint: {fingerprint}");

var keyInfo = new SshKeyGenerateInfo { Encryption = new SshKeyEncryptionAes256("my passphrase") };
var privateKey = SshKey.Generate(keyInfo);
var publicKey = privateKey.ToPublic();
var fingerprint = privateKey.Fingerprint();

Console.WriteLine($"Fingerprint: {fingerprint}");

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Unknown User•3mo ago

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iHouqLF•3mo ago

nvm, seems to work now xD Thank you for the help guys

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Generate RSA keypairs with passphrase for SSH.NET