Convert PuTTY Private Key (ppk) to OpenSSH (pem)

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

Download Chilkat 32-bit SSH / SFTP ActiveX (.msi)

Download All 32-bit Chilkat ActiveX Components (.zip)

Download All 64-bit Chilkat ActiveX Components (.zip)

<?php

$key = new COM("Chilkat.SshKey");

//  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:

$keyStr = $key->loadText('putty_private_key.ppk');

//  Import into the SSH key object:
$success = $key->FromPuttyPrivateKey($keyStr);
if ($success != true) {
    print $key->lastErrorText() . "\n";
    exit;
}

//  Convert to an encrypted or unencrypted OpenSSH key.

//  First demonstrate converting to an unencrypted OpenSSH key

$bEncrypt = false;
$unencryptedKeyStr = $key->toOpenSshPrivateKey($bEncrypt);
$success = $key->SaveText($unencryptedKeyStr,'unencrypted_openssh.pem');
if ($success != true) {
    print $key->lastErrorText() . "\n";
    exit;
}

//  Save to an encrypted OpenSSH PEM file:

$bEncrypt = true;
$key->Password = 'myPassword';
$encryptedKeyStr = $key->toOpenSshPrivateKey($bEncrypt);
$success = $key->SaveText($encryptedKeyStr,'encrypted_openssh.pem');
if ($success != true) {
    print $key->lastErrorText() . "\n";
    exit;
}

print 'Done!' . "\n";


?>