Perl

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

See more SSH Key Examples

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

use chilkat();

$success = 0;

$key = chilkat::CkSshKey->new();

# 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->put_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 != 1) {
    print $key->lastErrorText() . "\r\n";
    exit;
}

# Convert to an encrypted or unencrypted OpenSSH key.

# First demonstrate converting to an unencrypted OpenSSH key

$bEncrypt = 0;
$unencryptedKeyStr = $key->toOpenSshPrivateKey($bEncrypt);
$success = $key->SaveText($unencryptedKeyStr,"unencrypted_openssh.pem");
if ($success != 1) {
    print $key->lastErrorText() . "\r\n";
    exit;
}

# Save to an encrypted OpenSSH PEM file:

$bEncrypt = 1;
$key->put_Password("myPassword");
$encryptedKeyStr = $key->toOpenSshPrivateKey($bEncrypt);
$success = $key->SaveText($encryptedKeyStr,"encrypted_openssh.pem");
if ($success != 1) {
    print $key->lastErrorText() . "\r\n";
    exit;
}

print "Done!" . "\r\n";