Perl

Save a Private Key as an Encrypted PKCS #8 PEM File

Demonstrates the Chilkat PrivateKey.SavePkcs8EncryptedPemFile method, which saves the key as password-protected PKCS #8 PEM (the ENCRYPTED PRIVATE KEY label). The first argument is the password and the second 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: The text (PEM) form of an encrypted saved key — portable across systems and safe to store because the private material is protected by a passphrase. It is the encrypted counterpart to SavePkcs8PemFile and a good default for keys kept in configuration or version-controlled deployment repositories. Source the 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';

# Save as password-protected PKCS #8 PEM (the "ENCRYPTED PRIVATE KEY" label).  The 1st argument
# is the password and the 2nd is the destination path.
$success = $privKey->SavePkcs8EncryptedPemFile($password, 'qa_output/private_pkcs8_enc.pem');
if (!$success) {
    print $privKey->LastErrorText, "\n";
    exit;
}

print "Saved (encrypted).\n";