Node.js

Encrypt a File to a PKCS7 (CMS) Message

Shows how to encrypt a file into a PKCS7 encrypted message using the recipient's certificate. Public-key encryption requires no private key. However, the recipient's private key is necessary for decryption. Node.js

NODEJS_PRELUDE

function chilkatExample() {

    var success = false;

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

    var crypt = new chilkat.Crypt2();

    //  Load the recipient's digital certificate. 
    //  We don't need the private key for encryption.
    //  Only the public key is needed (which is included in a certificate).
    var cert1 = new chilkat.Cert();
    success = cert1.LoadFromFile("qa_data/user1/cert_user1.pem");
    //  Assume success for the example, but make sure your application checks for success/failure...
    crypt.SetEncryptCert(cert1);

    //  Indicate that we want PKI encryption (i.e. public-key infrastructure)
    //  to produce a CMS message (Cryptographic Message Syntax/PKCS7),
    //  that is be created with RSAES-OAEP padding, SHA256, and AES-256 for the
    //  bulk encryption.
    crypt.CryptAlgorithm = "pki";
    crypt.Pkcs7CryptAlg = "aes";
    crypt.KeyLength = 256;
    crypt.OaepHash = "sha256";
    crypt.OaepPadding = true;

    //  Load the file to be encrypted...
    var fileData = new chilkat.BinData();
    success = fileData.LoadFile("qa_data/jpg/penguins.jpg");
    //  Your app should check for success/failure..

    //  Encrypt the data.  The contents of the fileData object are replaced with the PKCS7 encrypted message.
    success = crypt.EncryptBd(fileData);
    if (success !== true) {
        console.log(crypt.LastErrorText);
        return;
    }

    //  Save the PKCS7 encrypted message to a file..
    success = fileData.WriteFile("qa_output/pkcs7_encrypted.p7");

    console.log("OK.");

}

chilkatExample();