Set JWE Additional Authenticated Data

See more JSON Web Encryption (JWE) Examples

Demonstrates Jwe.SetAad, which sets external Additional Authenticated Data (AAD) for a JWE being encrypted, encoding the supplied text with the given charset.

bool success = false;

Chilkat.Jwe jwe = new Chilkat.Jwe();

//  Protected header: AES key-wrap with AES-256-GCM content encryption.
Chilkat.JsonObject header = new Chilkat.JsonObject();
header.UpdateString("alg","A256KW");
header.UpdateString("enc","A256GCM");
success = jwe.SetProtectedHeader(header);
if (success == false) {
    Debug.WriteLine(jwe.LastErrorText);
    return;
}

//  The 256-bit key-wrapping key (base64) for recipient index 0.  In production, obtain the key from a
//  secure source rather than hard-coding it.
string base64Key = "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU=";
success = jwe.SetWrappingKey(0,base64Key,"base64");
if (success == false) {
    Debug.WriteLine(jwe.LastErrorText);
    return;
}

//  Set external Additional Authenticated Data (AAD).  The AAD is integrity-protected but not
//  encrypted, and must be supplied again when decrypting.
success = jwe.SetAad("context-info-v1","utf-8");
if (success == false) {
    Debug.WriteLine(jwe.LastErrorText);
    return;
}

Chilkat.StringBuilder sbContent = new Chilkat.StringBuilder();
sbContent.Append("This is the secret content.");
Chilkat.StringBuilder sbJwe = new Chilkat.StringBuilder();
success = jwe.EncryptSb(sbContent,"utf-8",sbJwe);
if (success == false) {
    Debug.WriteLine(jwe.LastErrorText);
    return;
}

Debug.WriteLine(sbJwe.GetAsString());