(Node.js) Duplicate openssl smime -decrypt -in some_file.dat.enc -binary -inform DER -inkey private.key -out some_file.dat

Demonstrates how to decrypt binary DER that was encrypted using the following openssl command:

openssl smime -encrypt -binary -aes-256-cbc -in some_file.dat -out some_file.dat.enc -outform DER cert.crt

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 API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // Duplicates the following openssl command:
    // openssl smime -decrypt -in hello.txt.enc -binary -inform DER -inkey private.key -out hello.txt

    var cert = new chilkat.Cert();
    var success = cert.LoadFromFile("qa_data/openssl/EE.cer");
    if (success == false) {
        console.log(cert.LastErrorText);
        return;
    }

    var bd = new chilkat.BinData();
    success = bd.LoadFile("qa_data/openssl/EE.key");
    // Assuming success..

    var privKey = new chilkat.PrivateKey();
    success = privKey.LoadAnyFormat(bd,"");
    if (success == false) {
        console.log(privKey.LastErrorText);
        return;
    }

    var crypt = new chilkat.Crypt2();
    success = crypt.SetDecryptCert2(cert,privKey);
    if (success == false) {
        console.log(crypt.LastErrorText);
        return;
    }

    crypt.CryptAlgorithm = "PKI";
    success = crypt.CkDecryptFile("qa_data/openssl/hello.txt.enc","qa_output/hello.txt");
    if (success == false) {
        console.log(crypt.LastErrorText);
        return;
    }

    console.log("Success.");

}

chilkatExample();