JavaScript

Encrypt MIME for Multiple Recipients

Demonstrates encrypting the current MIME entity for several recipients at once. A certificate is added for each recipient with AddEncryptCert, and EncryptN then produces a single CMS/PKCS #7 message that each recipient can independently decrypt.

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. When a message targets more than one recipient, each recipient's certificate is added to the internal list and EncryptN wraps the message key separately for each one. Any single recipient can then decrypt with their own private key.

Note

This example is intended for running within a Chilkat.Js embedded JavaScript engine. All Chilkat JavaScript examples require Chilkat v11.4.0 or greater.

JavaScript

var success = false;

var mime = new CkMime();
success = mime.SetBodyFromPlainText("This message will be encrypted.");
if (success == false) {
    console.log(mime.LastErrorText);
    return;
}

//  Add a certificate for each intended recipient.  Every recipient receives an independently
//  wrapped copy of the message key.
var cert1 = new CkCert();
success = cert1.LoadFromFile("qa_data/recipient1.cer");
if (success == false) {
    console.log(cert1.LastErrorText);
    return;
}

success = mime.AddEncryptCert(cert1);
if (success == false) {
    console.log(mime.LastErrorText);
    return;
}

var cert2 = new CkCert();
success = cert2.LoadFromFile("qa_data/recipient2.cer");
if (success == false) {
    console.log(cert2.LastErrorText);
    return;
}

success = mime.AddEncryptCert(cert2);
if (success == false) {
    console.log(mime.LastErrorText);
    return;
}

//  Encrypt for every added recipient at once.
success = mime.EncryptN();
if (success == false) {
    console.log(mime.LastErrorText);
    return;
}

success = mime.SaveMime("qa_output/encrypted_multi.eml");
if (success == false) {
    console.log(mime.LastErrorText);
    return;
}

console.log("Message encrypted for multiple recipients.");