Get SSH host key fingerprint using PowerShell. Requires the WinSCP .Net assembly.

readme.md

Description

You can use this snippet to retrieve an SSH host key fingerprint, suitable for usage with the winscp.com file transfer utility. You can copy/paste the function into your own script and use it that way.

Example

You can use it from the command line like this:

PS C:\Users\User\Desktop> function Get-SshFingerprint {
>>   param( [string]$ssh_server )
>>
>>   # Load WinSCP .NET assembly
>>   Add-Type -Path "${env:ProgramFiles(x86)}\WinSCP\WinSCPnet.dll"
>>
>>   # Setup session options
>>   $sessionOptions = New-Object WinSCP.SessionOptions -Property @{
>>       Protocol = [WinSCP.Protocol]::Sftp
>>       HostName = $ssh_server
>>       UserName = ""
>>   }
>>
>>   # Scan for the host key
>>   $session = New-Object WinSCP.Session
>>   try
>>   {
>>       $fingerprint = $session.ScanFingerprint($sessionOptions, "SHA-256")
>>   }
>>   finally
>>   {
>>       $session.Dispose()
>>   }
>>
>>   # And output the host key to the pipeline
>>   Write-Output $fingerprint
>> }
PS C:\Users\User\Desktop> Get-SshFingerprint github.com
ssh-rsa 2048 nThbg6kXUpJWGl7E1IGOCspRomTxdCARLviKw6E5SY8=

get-sshfingerprint.ps1

function Get-SshFingerprint {
  param( [string]$ssh_server )

  # Load WinSCP .NET assembly
  Add-Type -Path "${env:ProgramFiles(x86)}\WinSCP\WinSCPnet.dll"

  # Setup session options
  $sessionOptions = New-Object WinSCP.SessionOptions -Property @{
      Protocol = [WinSCP.Protocol]::Sftp
      HostName = $ssh_server
      UserName = ""
  }

  # Scan for the host key
  $session = New-Object WinSCP.Session
  try
  {
      $fingerprint = $session.ScanFingerprint($sessionOptions, "SHA-256")
  }
  finally
  {
      $session.Dispose()
  }

  # And output the host key to the pipeline
  Write-Output $fingerprint
}