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(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
    Console.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
    Console.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
    Console.WriteLine(key.LastErrorText)
    Exit Sub
End If


Console.WriteLine("Done!")

 

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