(Node.js) Encrypt File using X.509 Certificate using AES in CBC Mode

Demonstrates how to encrypt a file using an X.509 Certificate's public key, where the underlying bulk encryption algorithm is 128-bit AES in CBC mode. (The underlying bulk encryption algorithm can be specified to be other algorithms/strengths.)

Install Chilkat for Node.js and Electron using npm at Chilkat npm packages for Node.js Chilkat npm packages for Electron on Windows, Linux, MacOSX, and ARM

var os = require('os');
if (os.platform() == 'win32') {  
    if (os.arch() == 'ia32') {
        var chilkat = require('@chilkat/ck-node21-win-ia32');
    } else {
        var chilkat = require('@chilkat/ck-node21-win64'); 
    }
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node21-arm');
    } else if (os.arch() == 'x86') {
        var chilkat = require('@chilkat/ck-node21-linux32');
    } else {
        var chilkat = require('@chilkat/ck-node21-linux64');
    }
} else if (os.platform() == 'darwin') {
    if (os.arch() == 'arm64') {
        var chilkat = require('@chilkat/ck-node21-mac-m1');
    } else {
        var chilkat = require('@chilkat/ck-node21-macosx');
    }
}

function chilkatExample() {

    // This example requires the Chilkat Crypt API to have been previously unlocked.
    // See Unlock Chilkat Crypt for sample code.

    var crypt = new chilkat.Crypt2();

    // Use public-key cryptography for encryption.
    crypt.CryptAlgorithm = "pki";

    // Get an X.509 certificate to use for encrypting.
    // Note: Chilkat provides many different ways of loading a certificate, from many different formats,
    // or if on Windows, from the installed certificates on the system.
    // This example simply loads a certificate from a file.
    // Also, for encryption, only the public key is needed.  Digital certificates embed the public key
    // within the X.509 format itself.  Therefore, if you have a certificate, you also have the public key.
    var cert = new chilkat.Cert();
    var success = cert.LoadFromFile("qa_data/certs/testCert.cer");
    if (success !== true) {
        console.log(cert.LastErrorText);
        return;
    }

    success = crypt.SetEncryptCert(cert);
    if (success !== true) {
        console.log(crypt.LastErrorText);
        return;
    }

    // Indicate the underlying bulk encryption algorithm to be used:
    crypt.Pkcs7CryptAlg = "aes";
    crypt.KeyLength = 128;

    // Note: When doing public-key encryption the underlying bulk symmetric cipher mode will always be CBC. (at least with Chilkat...)

    // There's one last option that could be set.  If is the RSA encryption encryption/padding scheme. 
    // By default, RSAES_PKCS1-V1_5 is used.  If desired, the OaepPadding property could be set to true to
    // use RSAES_OAEP.  (We'll leave it set at the default value of false)
    crypt.OaepPadding = false;

    // Everything is specified.  Now just encrypt...
    // The output is PKCS7 in binary DER format.
    success = crypt.CkEncryptFile("qa_data/hamlet.xml","qa_output/hamlet.p7");
    if (success !== true) {
        console.log(crypt.LastErrorText);
        return;
    }

    console.log("Finished.");

}

chilkatExample();