JavaScript

Find a JWE Recipient by Header Value

See more JSON Web Encryption (JWE) Examples

Demonstrates Jwe.FindRecipient, which searches the per-recipient unprotected headers for a member with a given name and string value, and returns the matching recipient index.

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. This locates the recipient that a particular key belongs to (for example by kid) before decrypting. The method returns -1 when no match is found.

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();

//  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 a multi-recipient JWE (JSON serialization) from a file.
var sbJwe = new CkStringBuilder();
var bLoaded = sbJwe.LoadFile("qa_data/message.jwe","utf-8");
if (bLoaded !== true) {
    console.log("Failed to load the JWE file.");
    return;
}

success = jwe.LoadJweSb(sbJwe);
if (success == false) {
    console.log(jwe.LastErrorText);
    return;
}

//  Search the per-recipient unprotected headers for a member named "kid" whose value equals the
//  given string.  Returns the recipient index, or -1 if not found.
var bCaseSensitive = true;
var index = jwe.FindRecipient("kid","recipient-key-1",bCaseSensitive);
if (index < 0) {
    console.log("Recipient not found.");
    return;
}

console.log("Found recipient at index " + index);