(VB.NET) Convert PuTTY Private Key (ppk) to OpenSSH (pem)

Convert a PuTTY format private key file (.ppk) to OpenSSH (.pem).

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Dim key As New Chilkat.SshKey

Dim success As Boolean

' Load an unencrypted or encrypted PuTTY private key.

' If  your PuTTY private key is encrypted, set the Password
' property before calling FromPuttyPrivateKey.
' If your PuTTY private key is not encrypted, it makes no diffference
' if Password is set or not set.
key.Password = "secret"

' First load the .ppk file into a string:
Dim keyStr As String
keyStr = key.LoadText("putty_private_key.ppk")

' Import into the SSH key object:
success = key.FromPuttyPrivateKey(keyStr)
If (success <> True) Then
    Debug.WriteLine(key.LastErrorText)
    Exit Sub
End If


' Convert to an encrypted or unencrypted OpenSSH key.

' First demonstrate converting to an unencrypted OpenSSH key
Dim unencryptedKeyStr As String
Dim bEncrypt As Boolean = False
unencryptedKeyStr = key.ToOpenSshPrivateKey(bEncrypt)
success = key.SaveText(unencryptedKeyStr,"unencrypted_openssh.pem")
If (success <> True) Then
    Debug.WriteLine(key.LastErrorText)
    Exit Sub
End If


' Save to an encrypted OpenSSH PEM file:
Dim encryptedKeyStr As String
bEncrypt = True
key.Password = "myPassword"
encryptedKeyStr = key.ToOpenSshPrivateKey(bEncrypt)
success = key.SaveText(encryptedKeyStr,"encrypted_openssh.pem")
If (success <> True) Then
    Debug.WriteLine(key.LastErrorText)
    Exit Sub
End If


Debug.WriteLine("Done!")