Encrypt StringBuilder Content to a JWE

See more JSON Web Encryption (JWE) Examples

Demonstrates Jwe.EncryptSb, which encrypts content supplied in a StringBuilder and writes the resulting JWE into another StringBuilder.

Background. JWE (JSON Web Encryption) protects content with a content-encryption algorithm (the header enc value) while the content-encryption key is managed by the key-management algorithm (the header alg value). This example uses AES key wrapping with a symmetric wrapping key.

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bool success = false;

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

//  Set the JWE protected header, specifying the key-management algorithm (alg) and the content-
//  encryption algorithm (enc).
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;
}

//  Encrypt content supplied in a StringBuilder, writing the resulting JWE into another StringBuilder.
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());