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Load an Encrypted PKCS #8 Private Key File

Demonstrates the Chilkat PrivateKey.LoadPkcs8EncryptedFile method, which loads a private key from a file, using a password when the key is encrypted. The first argument is the file path and the second is the password. It handles encrypted PKCS #8 DER or PEM, and unencrypted forms.

Note: The file path is relative to the application's current working directory. Absolute paths may also be used. Supply the path to your own key file.

Background: Encrypted PKCS #8 is the standard way to store a password-protected key in either binary DER or Base64 PEM. This loader decrypts both, and because it also accepts unencrypted input it is a robust choice when a PKCS #8 file may or may not be encrypted. As always, source the password securely.

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const std = @import("std");
const chilkat = @import("chilkat");

pub fn main(init: std.process.Init) !void {
    const alloc = init.arena.allocator();

    // Demonstrates the PrivateKey.LoadPkcs8EncryptedFile method, which loads a private key from a
    // file, using a password when the key is encrypted.  The 1st argument is the file path and the
    // 2nd is the password.  It handles encrypted PKCS #8 DER or PEM, as well as unencrypted forms.

    const priv_key = try chilkat.PrivateKey.init();
    defer priv_key.deinit();

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

    priv_key.loadPkcs8EncryptedFile("qa_data/private_pkcs8_enc.der", password) catch {
        std.debug.print("{s}\n", .{try priv_key.getLastErrorText(alloc)});
        return;
    };

    std.debug.print("Loaded a {s} private key.\n", .{try priv_key.getKeyType(alloc)});
}