Perl

Export a Private Key as DER into a BinData

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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use strict;
use warnings;
use Chilkat2;

# Load a private key to export.
my $privKey = Chilkat2::PrivateKey->new;
my $success = $privKey->LoadPemFile('qa_data/private.pem');
if (!$success) {
    print $privKey->LastErrorText, "\n";
    exit;
}

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

# Export the key as DER into a BinData.  The 1st argument selects PKCS #1 (1) versus PKCS #8
# (0); the 2nd is the password (empty string for an unencrypted export); the 3rd is the
# BinData that receives the DER bytes.
my $usePkcs1 = 0;
my $bd = Chilkat2::BinData->new;
$success = $privKey->GetPkcsBd($usePkcs1, $password, $bd);
if (!$success) {
    print $privKey->LastErrorText, "\n";
    exit;
}

print 'Exported ', $bd->NumBytes, " DER bytes.\n";