VB.NET

SSH Public Key Authentication

See more SSH Examples

Demonstrates how to authenticate with an SSH server using public key authentication. VB.NET

Dim success As Boolean = False

' This example assumes the Chilkat API to have been previously unlocked.
' See Global Unlock Sample for sample code.

Dim ssh As New Chilkat.Ssh

' Set some timeouts, in milliseconds:
ssh.ConnectTimeoutMs = 5000
ssh.IdleTimeoutMs = 15000

' Connect to the SSH server.  
' The standard SSH port = 22
' The hostname may be a hostname or IP address.
Dim hostname As String = "sftp.example.com"
Dim port As Integer = 22
success = ssh.Connect(hostname,port)
If (success <> True) Then
    Debug.WriteLine(ssh.LastErrorText)
    Exit Sub
End If


Dim key As New Chilkat.SshKey

' Read the PEM file into a string variable:
' (This does not load the PEM file into the key.  The LoadText
' method is a convenience method for loading the full contents of ANY text
' file into a string variable.)
Dim privKey As String = key.LoadText("myPrivateKey.pem")
If (key.LastMethodSuccess <> True) Then
    Debug.WriteLine(key.LastErrorText)
    Exit Sub
End If


' Load a private key from a PEM string:
' (Private keys may be loaded from OpenSSH and Putty formats.
' Both encrypted and unencrypted private key file formats
' are supported.  This example loads an unencrypted private
' key in OpenSSH format.  PuTTY keys typically use the .ppk
' file extension, while OpenSSH keys use the PEM format.
' (For PuTTY keys, call FromPuttyPrivateKey instead.)
success = key.FromOpenSshPrivateKey(privKey)
If (success <> True) Then
    Debug.WriteLine(key.LastErrorText)
    Exit Sub
End If


' Authenticate with the SSH server using the login and
' private key.  (The corresponding public key should've 
' been installed on the SSH server beforehand.)
success = ssh.AuthenticatePk("myLogin",key)
If (success <> True) Then
    Debug.WriteLine(ssh.LastErrorText)
    Exit Sub
End If

Debug.WriteLine(ssh.LastErrorText)
Debug.WriteLine("Public-Key Authentication Successful!")