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(VBScript) SSH Set Allowed AlgorithmsSee more SSH ExamplesDemonstrates how to explicitly set the algorithms allowed in the SSH connection protocol. Note: This example requires Chilkat v9.5.0.99 or greater.
Dim fso, outFile Set fso = CreateObject("Scripting.FileSystemObject") Set outFile = fso.CreateTextFile("output.txt", True) ' This example requires the Chilkat API to have been previously unlocked. ' See Global Unlock Sample for sample code. set ssh = CreateObject("Chilkat_9_5_0.Ssh") set json = CreateObject("Chilkat_9_5_0.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. ' ------------------------------------------------------------------------------------------------------------------------------------------- allowed_kex = "curve25519-sha256@libssh.org,ecdh-sha2-nistp256" allowed_hostKey = "ssh-ed25519,ecdsa-sha2-nistp256" allowed_cipher = "chacha20-poly1305@openssh.com,aes256-ctr" allowed_mac = "hmac-sha2-256,hmac-sha2-512" success = json.UpdateString("kex",allowed_kex) success = json.UpdateString("hostKey",allowed_hostKey) success = json.UpdateString("cipher",allowed_cipher) success = json.UpdateString("mac",allowed_mac) success = ssh.SetAllowedAlgorithms(json) port = 22 success = ssh.Connect("example.com",port) If (success <> 1) Then outFile.WriteLine(ssh.LastErrorText) WScript.Quit End If outFile.WriteLine("Connected.") ' .... ' .... outFile.Close |
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