Perl

Save a Private Key as a Traditional DER File

Demonstrates the Chilkat PrivateKey.SavePkcs1File method, which saves the key using the traditional/preferred unencrypted DER representation. The only argument is the destination path.

Note: The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Background: This writes the older, algorithm-specific DER structure — useful for compatibility with tools that predate or do not accept PKCS #8. For new work, PKCS #8 (SavePkcs8File) is more interoperable. The output is unencrypted, so protect the file accordingly.

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Perl

use chilkat();

$success = 0;

#  Load a private key to export.
$privKey = chilkat::CkPrivateKey->new();
$success = $privKey->LoadPemFile("qa_data/private.pem");
if ($success == 0) {
    print $privKey->lastErrorText() . "\r\n";
    exit;
}

#  Save using the traditional/preferred unencrypted DER representation.
$success = $privKey->SavePkcs1File("qa_output/private_pkcs1.der");
if ($success == 0) {
    print $privKey->lastErrorText() . "\r\n";
    exit;
}

print "Saved." . "\r\n";