B4X

SFTP Public-Key Authentication

See more SFTP Examples

Demonstrates how to authenticate with an SSH/SFTP server using publickey authentication. B4X

Dim success As Boolean = False

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

Dim sftp As ChilkatSFtp
sftp.Initialize("sftp")

'  Set some timeouts, in milliseconds:
sftp.ConnectTimeoutMs = 5000
sftp.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 Int = 22
success = sftp.Connect(hostname, port)
If success <> True Then
    Log(sftp.LastErrorText)
    Return
End If


Dim key As ChilkatSshKey
key.Initialize

'  Load a 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
    Log(key.LastErrorText)
    Return
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.
success = key.FromOpenSshPrivateKey(privKey)
If success <> True Then
    Log(key.LastErrorText)
    Return
End If


'  Authenticate with the SSH server.  Chilkat SFTP supports
'  both password-based authenication as well as public-key
'  authentication.  
success = sftp.AuthenticatePk("myLogin", key)
If success <> True Then
    Log(sftp.LastErrorText)
    Return
End If

Log(sftp.LastErrorText)
Log("Public-Key Authentication Successful!")