B4X
Use PuTTY Key for SFTP Authentication

Demonstrates how to authenticate with a username + .ppk PuTTY private key for SFTP authentication.
Chilkat B4X Downloads

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")

'  Load a .ppk PuTTY private key.
Dim puttyKey As ChilkatSshKey
puttyKey.Initialize
Dim ppkText As String = puttyKey.LoadText("qa_data/ppk/putty_private_secret.ppk")

'  The ppkText contains this content:

'  	PuTTY-User-Key-File-2: ssh-rsa
'  	Encryption: aes256-cbc
'  	Comment: rsa-key-20170126
'  	Public-Lines: 6
'  	AAAAB3NzaC1yc2EAAAABJQAAAQEAx+52s7vvaZ8rT2UdFZWlSUVDHDQ+5ZRFvgRW
'  	6nm2sO1c9WqNg7u2PQL4jeKSDX2XWcMnpleALz2x8Rr4rMy5E1iZzvWov8VtFd8l
'  	fa9HOkgEeJB3VFuYR3NlnD3eyCoYJYPVpHJHrIeui2WZs5vQ76HDe+th8+z5Ald4
'  	zPw3p2c6ZJpBrkSBM67hWokoBDi23c7NhszDHhJBrv+B98cQxnagI1PUKqN7E8Vg
'  	bNtBI8beIMHyI69up9G1AXSEi0cGIjYNx9RNUPau1mRk/SvfqxgWkAjM005lj7hc
'  	bOsjbdKK3T2NtrKTaYjEiXlEXcj1iGuApsD/m73pYaEJB3Nd7w==
'  	Private-Lines: 14
'  	MoaDbq0owouN/7Z9Pga0favDhM2bSEgMErJBxdDmNUXIVVcUoLiD/Ps1RA+BeBBX
'  	wxqKUt9PqLy/pnafPR/i2xjJiQtQ0CWkPxND16Gi1dqLzmbQYYl1ev4+LzuG0zNX
'  	HDGMvRiwagY7mY+F1tUjBYfOL6z8XHw4m40YcY1QorOO+0MMzAVT5Hkg8YyXW209
'  	B/V/LRADFMVA2BlL39y11cb5ZpFStPH/waYUMY+2w1ZmJZ7dcRoMjuKmY+YE/tUx
'  	n9X3P0qTNSbw6e6sMG3Dhr1vfoJUQWApUliD6GpUiCeIvXBcVqG8Vsfq9XADsPl0
'  	+nFAwjSZflywcB7/FwhGb7q5UmcJK06SzoMl7Og5e3g7NCs3yNNQIv+qCpDjhxrA
'  	hpT03mbipu7OXCZDeUwUhMGJAmYHE5iqm1rPCsSVbaMgpxhCWf01Cx4gLx3aMvn4
'  	MdylA31GuL3wSxcWTslrOI8+449lZN/qZEnGEZkYTrnlu123jTqsAWMMtuHSz2Ig
'  	6GA89oTdlppkNflhNH3OJ85kMUrc3p/ZBMdndz8jTDTljmJjHR5oNMoShFof115A
'  	nWjUHqBwCgcubLYyH3afDvBTOhtl0tJ9Oby0wJlOAGnCXiPSDbF/y7J7xml/PS9t
'  	XlSVNxtAY15NDO6Fp96sBVfKuJsfJ90PzdBom4ikIuf7sMwtElrHHLuYfcXJQYLp
'  	G5jBmqDgnirosVPEBIxlxFzz/HCRmdU+tsYg46gqI4R5UpKUe8WSaJoZkDGsrqhm
'  	e+1SJaBuafR4v2bx/bV414Hg7LGQosK2S3crxH4UgZl+g02vWznZfBH+9CmHvKDR
'  	AxfcKOTzsaILKJtQPV81lmJ45sARYMcB5jMiE4kBg56hiXouChsvKkm55WVcW1E+
'  	Private-MAC: 17512c9f7582c1d9c3ae2b01b4d67a6b1dbd1d0e

'  "secret" is the actual password for the above PPK.
puttyKey.Password = "secret"
success = puttyKey.FromPuttyPrivateKey(ppkText)
If success <> True Then
    Log(puttyKey.LastErrorText)
    Return
End If


Dim sshHostname As String = "sftp.example.com"
Dim sshPort As Int = 22

'  Connect to an SSH/SFTP server
success = sftp.Connect(sshHostname, sshPort)
If success <> True Then
    Log(sftp.LastErrorText)
    Return
End If


'  Authenticate with the SSH server using a username + private key.
'  (The private key serves as the password.  The username identifies
'  the SSH user account on the server.)
success = sftp.AuthenticatePk("mySshLogin", puttyKey)
If success <> True Then
    Log(sftp.LastErrorText)
    Return
End If


Log("OK, the connection and authentication with the SSH server is completed.")

'  This example is only to show the connection + authentication using a PuTTY private key...