(Node.js) Decrypt a .p7m File (using a PFX)

Node.js sample code showing how to decrypt a .p7m using a .p12 / .pfx certificate w/ private key.

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

var os = require('os');
if (os.platform() == 'win32') {  
  var chilkat = require('@chilkat/ck-node23-win64'); 
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node23-linux-arm');
    } else if (os.arch() == 'arm64') {
        var chilkat = require('@chilkat/ck-node23-linux-arm64');
    } else {
        var chilkat = require('@chilkat/ck-node23-linux-x64');
    }
} else if (os.platform() == 'darwin') {
  var chilkat = require('@chilkat/ck-node23-mac-universal');
}

function chilkatExample() {

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

    var crypt = new chilkat.Crypt2();

    // Use a digital certificate and private key from a PFX file (.pfx or .p12).
    var pfxPath = "myCertAndKey.pfx";
    var pfxPassword = "test123";

    var success = crypt.AddPfxSourceFile(pfxPath,pfxPassword);
    if (success !== true) {
        console.log(crypt.LastErrorText);
        return;
    }

    // Set the  outPath to whatever is appropriate.
    // If you are decrypting a PDF, your output might be "out.pdf"...
    var inPath = "smime.p7m";
    var outPath = "original.txt";

    // Indicate that we're doing public key decryption (i.e. PKCS7)
    crypt.CryptAlgorithm = "pki";

    success = crypt.CkDecryptFile(inPath,outPath);
    if (success == false) {
        console.log(crypt.LastErrorText);
        return;
    }

    console.log("Success.");

}

chilkatExample();