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SFTP Set Allowed Algorithms

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Demonstrates how to explicitly set the algorithms allowed in the SSH connection protocol for SFTP.

Note: This example requires Chilkat v9.5.0.99 or greater.

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Local $bSuccess = False

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

$oSftp = ObjCreate("Chilkat.SFtp")

$oJson = ObjCreate("Chilkat.JsonObject")

; Here are the algorithms supported by Chilkat at the time this example was written (14-June-2024)

; ---------------------------
; SSH Key-Exchange Algorithms
; ---------------------------
; curve25519-sha256
; curve25519-sha256@libssh.org
; ecdh-sha2-nistp256
; ecdh-sha2-nistp384
; ecdh-sha2-nistp521
; diffie-hellman-group14-sha256
; diffie-hellman-group16-sha512
; diffie-hellman-group18-sha512
; diffie-hellman-group-exchange-sha256
; diffie-hellman-group1-sha1
; diffie-hellman-group14-sha1
; diffie-hellman-group-exchange-sha1

; ---------------------------
; SSH Host Key Algorithms
; ---------------------------
; ssh-ed25519
; ecdsa-sha2-nistp256
; ecdsa-sha2-nistp384
; ecdsa-sha2-nistp521
; rsa-sha2-256
; rsa-sha2-512
; ssh-rsa
; ssh-dss

; ---------------------------
; SSH Cipher Algorithms
; ---------------------------
; chacha20-poly1305@openssh.com
; aes128-ctr
; aes256-ctr
; aes192-ctr
; aes128-cbc
; aes256-cbc
; aes192-cbc
; aes128-gcm@openssh.com
; aes256-gcm@openssh.com
; twofish256-cbc
; twofish128-cbc
; blowfish-cbc

; ---------------------------
; SSH MAC Algorithms
; ---------------------------
; hmac-sha2-256
; hmac-sha2-512
; hmac-sha2-256-etm@openssh.com
; hmac-sha2-512-etm@openssh.com
; hmac-sha1-etm@openssh.com
; hmac-sha1
; hmac-ripemd160
; hmac-sha1-96
; hmac-md5

; Specify the allowed key-exchange, host-key, cipher (i.e. encryption), and mac (i.e. hash) algorithms allowed, in the order of preference.
; -------------------------------------------------------------------------------------------------------------------------------------------
; Note: You typically should NOT explicitly set allowed algorithms.
; By default, Chilkat orders algorithms according to best practices, and pays attention to vulnerabilities such as the "Terrapin Attack".
; Hard-coding algorthims can make your application brittle and prone to breaking over a long period of time,
; if a server (at some point in the future) changes its allowed algorithms, or if you connect to a different server,
; such that the client (Chilkat) and server cannot find a set of mutually agreed-upon algorithms.
; -------------------------------------------------------------------------------------------------------------------------------------------
Local $sAllowed_kex = "curve25519-sha256@libssh.org,ecdh-sha2-nistp256"
Local $sAllowed_hostKey = "ssh-ed25519,ecdsa-sha2-nistp256"
Local $sAllowed_cipher = "chacha20-poly1305@openssh.com,aes256-ctr"
Local $sAllowed_mac = "hmac-sha2-256,hmac-sha2-512"

$oJson.UpdateString("kex",$sAllowed_kex)
$oJson.UpdateString("hostKey",$sAllowed_hostKey)
$oJson.UpdateString("cipher",$sAllowed_cipher)
$oJson.UpdateString("mac",$sAllowed_mac)
$oSftp.SetAllowedAlgorithms($oJson)

Local $iPort = 22
$bSuccess = $oSftp.Connect("example.com",$iPort)
If ($bSuccess <> True) Then
    ConsoleWrite($oSftp.LastErrorText & @CRLF)
    Exit
EndIf

ConsoleWrite("Connected." & @CRLF)

; ....
; ....