PowerBuilder

SSH Key Fingerprint

Demonstrates generating a fingerprint for an SSH key. The private key is imported into an SshKey object — setting Password first if the key file is encrypted — and GenFingerprint returns the fingerprint.

Note: The file paths are relative to the application's current working directory. Supply the paths to your own files.

Background: A key fingerprint is a short hash that stands in for the full key, making it practical for humans to compare and for inventories to record. The everyday use is confirming that the private key you hold corresponds to a particular public key installed on a server — matching fingerprints is far easier than comparing key material. Note this fingerprints your own key; use Ssh.GetHostKeyFP to fingerprint a server's host key.

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PowerBuilder

integer li_rc
integer li_Success
oleobject loo_Key
string ls_KeyStr
string ls_Fingerprint

li_Success = 0

//  Demonstrates generating a fingerprint for an SSH key.

loo_Key = create oleobject
li_rc = loo_Key.ConnectToNewObject("Chilkat.SshKey")
if li_rc < 0 then
    destroy loo_Key
    MessageBox("Error","Connecting to COM object failed")
    return
end if

//  Set the password before importing an encrypted private key.  This should come from a secure
//  source rather than being hard-coded.
loo_Key.Password = "myKeyPassword"

//  LoadText is a convenience method that reads any text file into a string.  It does not itself
//  load the key.
ls_KeyStr = loo_Key.LoadText("qa_data/privkey_openssh_encrypted.pem")
if loo_Key.LastMethodSuccess = 0 then
    Write-Debug loo_Key.LastErrorText
    destroy loo_Key
    return
end if

li_Success = loo_Key.FromOpenSshPrivateKey(ls_KeyStr)
if li_Success = 0 then
    Write-Debug loo_Key.LastErrorText
    destroy loo_Key
    return
end if

ls_Fingerprint = loo_Key.GenFingerprint()
if loo_Key.LastMethodSuccess = 0 then
    Write-Debug loo_Key.LastErrorText
    destroy loo_Key
    return
end if

Write-Debug ls_Fingerprint
//  For example:  ssh-rsa 2048 d0:5f:f7:d6:49:60:7b:50:19:f4:41:59:d4:1f:61:7a


destroy loo_Key