JavaScript

Decrypt a JWE with a Private Key

See more JSON Web Encryption (JWE) Examples

Demonstrates Jwe.SetPrivateKey, which sets the private key used to decrypt a recipient of a loaded JWE.

The file path is relative to the application's current working directory. An absolute path may also be used. Supply the path appropriate to your own environment.

Background. The private key unwraps the content-encryption key that was wrapped with the corresponding public key during encryption.

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 jwe = new CkJwe();

//  Load the JWE compact serialization to be decrypted.
var jweCompact = "eyJhbGciOiJBMjU2S1ciLCJlbmMiOiJBMjU2R0NNIn0.<...>.<iv>.<ciphertext>.<tag>";
success = jwe.LoadJwe(jweCompact);
if (success == false) {
    console.log(jwe.LastErrorText);
    return;
}

//  The file path is relative to the application's current working directory.  An absolute path
//  may also be used.  Supply the path appropriate to your own environment.
//  Load the recipient's private key.
var privKey = new CkPrivateKey();
success = privKey.LoadPemFile("qa_data/recipient_privkey.pem");
if (success == false) {
    console.log(privKey.LastErrorText);
    return;
}

//  Set the private key used to decrypt recipient 0.
success = jwe.SetPrivateKey(0,privKey);
if (success == false) {
    console.log(jwe.LastErrorText);
    return;
}

var content = jwe.Decrypt(0,"utf-8");
if (jwe.LastMethodSuccess == false) {
    console.log(jwe.LastErrorText);
    return;
}

console.log(content);