Export a Private Key as DER into a BinData

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Demonstrates the Chilkat PrivateKey.GetPkcsBd method, which exports the key as DER into a BinData. The first argument selects PKCS #1 (true) versus PKCS #8 (false), the second is the password (empty for unencrypted), and the third is the BinData that receives the bytes.

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 is the in-memory binary export — the raw DER bytes land in a BinData ready to hash, encrypt, or hand to another API without a temporary file. One method covers several cases: the boolean picks the traditional (PKCS #1) versus modern (PKCS #8) structure, and a nonempty password produces an encrypted PKCS #8 export (with the cipher from Pkcs8EncryptAlg). Source any password securely.

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bool success = false;

//  Load a private key to export.
Chilkat.PrivateKey privKey = new Chilkat.PrivateKey();
success = privKey.LoadPemFile("qa_data/private.pem");
if (success == false) {
    Debug.WriteLine(privKey.LastErrorText);
    return;
}

//  The key password is not hard-coded in a real application; obtain it from an interactive
//  prompt, environment variable, or a secrets vault.
string password = "myKeyPassword";

//  Export the key as DER into a BinData.  The 1st argument selects PKCS #1 (true) versus PKCS #8
//  (false); the 2nd is the password (empty string for an unencrypted export); the 3rd is the
//  BinData that receives the DER bytes.
bool usePkcs1 = false;
Chilkat.BinData bd = new Chilkat.BinData();
success = privKey.GetPkcsBd(usePkcs1,password,bd);
if (success == false) {
    Debug.WriteLine(privKey.LastErrorText);
    return;
}

Debug.WriteLine("Exported " + Convert.ToString(bd.NumBytes) + " DER bytes.");