(Node.js) Encrypt with Chilkat, Decrypt with OpenSSL

Demonstrates how to RSA encrypt a string using Chilkat, and then shows the corresponding OpenSSL command to RSA decrypt. The OpenSSL command to decrypt is as follows:

openssl rsautl -decrypt -inkey VP_Private.pem -in rsa_encrypted.bin -out original.txt

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.

    var rsa = new chilkat.Rsa();

    // Note: RSA encryption uses the public key.  
    // RSA decryption uses the private key.
    // The reason is that the public key can be freely provided to anybody.  This allows anybody
    // to send an encrypted message to the private key owner, and only the private key owner 
    // can decrypt.
    var key = new chilkat.PublicKey();

    // Load an RSA public key from a PEM file:
    var success = key.LoadFromFile("qa_data/pem/VP_Public.pem");
    if (success !== true) {
        console.log(key.LastErrorText);
        return;
    }

    // Load the public key into the RSA object.
    success = rsa.ImportPublicKeyObj(key);
    if (success !== true) {
        console.log(rsa.LastErrorText);
        return;
    }

    var strToEncrypt = "00000000;XYZ2-3BHQ-ABCD-MMVV;6MY1-GHJK-9LRR;0";

    // The LittleEndian property is false by default, but it is set here
    // anyway to show that LittleEndian byte ordering is required for OpenSSL compatibility.
    rsa.LittleEndian = false;

    var usePrivateKey = false;

    encryptedBytes = rsa.EncryptString(strToEncrypt,usePrivateKey);
    if (rsa.LastMethodSuccess !== true) {
        console.log(rsa.LastErrorText);
        return;
    }

    // The OpenSSL command to decrypt would be this:
    // openssl rsautl -decrypt -inkey VP_Private.pem -in rsa_encrypted.bin -out original.txt

    var fac = new chilkat.FileAccess();
    success = fac.WriteEntireFile("qa_output/rsa_encrypted.bin",encryptedBytes);
    if (success !== true) {
        console.log(fac.LastErrorText);
        return;
    }

    console.log("RSA Encryption Succeeded.");

}

chilkatExample();