Node.js

Encrypt File to PKCS7 .p7m

See more Encryption Examples

_LANGUAGE_ example to public-key encrypt a file creating a PKCS#7 .p7m file as output. Also demonstrates how to decrypt the .p7m to recover the original file. 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();

    //  Indicate the public-key encryption is to be used.
    //  Do this by setting the encryption algorithm equal 
    //  to "PKI" (an acroynm for public-key infrastructure).
    crypt.CryptAlgorithm = "PKI";

    //  Indicate the inner symmetric encryption algorithm to be used.
    //  possible values are "aes", "des", "3des", and "rc2".
    //  For this example, we'll use 256-bit AES encryption.
    crypt.Pkcs7CryptAlg = "aes";
    crypt.KeyLength = 256;

    //  To encrypt, only a certificate w/ public key is needed.
    //  (The certificate w/ private key is required for decryption.)

    //  The LoadFromFile method can load virtually any certificate format:
    //  1. DER encoded binary X.509 (.CER)
    //  2. Base-64 encoded X.509 (.CER)
    //  3. Cryptographic Message Syntax Standard - PKCS #7 Certificates (.P7B)
    //  4. PEM format
    var encryptCert = new chilkat.Cert();
    success = encryptCert.LoadFromFile("/Users/chilkat/testData/cer/acme.cer");
    if (success !== true) {
        console.log(encryptCert.LastErrorText);
        return;
    }

    //  Tell the crypt object to use the certificate for encrypting:
    crypt.AddEncryptCert(encryptCert);

    //  Encrypt a file, producing a .p7m as output.
    //  The input file is unchanged, the output .p7m contains the encrypted
    //  contents of the input file.
    var inFile = "/Users/chilkat/testData/pdf/sample.pdf";
    var outFile = "/Users/chilkat/testData/p7m/sample.pdf.p7m";
    success = crypt.CkEncryptFile(inFile,outFile);
    if (success !== true) {
        console.log(crypt.LastErrorText);
        return;
    }

    //  For demonstration purposes, a different instance of the object will be used
    //  for decryption.
    var decrypt = new chilkat.Crypt2();

    //  To decrypt, the certificate w/ private key is required.  A PFX (also known
    //  as PKCS#12) is a common secure container for certs and private keys.
    var pfxFilename = "/Users/chilkat/testData/pfx/acme.pfx";
    var pfxPassword = "secret";

    //  Tell the component to look in the PFX file for certs and private keys.
    success = decrypt.AddPfxSourceFile(pfxFilename,pfxPassword);
    if (success !== true) {
        console.log(decrypt.LastErrorText);
        return;
    }

    //  Tell the decrypt object that PKI (public key encryption) is to be used
    //  for decryptiong.
    decrypt.CryptAlgorithm = "PKI";
    //  There is no need to set the Pkcs7Alg or KeyLength because this information
    //  is contained within the .p7m

    //  Decrypt the .p7m
    inFile = "/Users/chilkat/testData/p7m/sample.pdf.p7m";
    outFile = "/Users/chilkat/testData/pdf/recovered.pdf";
    success = decrypt.CkDecryptFile(inFile,outFile);
    if (success == false) {
        console.log(decrypt.LastErrorText);
        return;
    }

    console.log("Success!");

}

chilkatExample();