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.

#include <CkJweW.h>
#include <CkJsonObjectW.h>
#include <CkStringBuilderW.h>

void ChilkatSample(void)
    {
    bool success = false;

    CkJweW jwe;

    //  Protected header: AES key-wrap with AES-256-GCM content encryption.
    CkJsonObjectW header;
    header.UpdateString(L"alg",L"A256KW");
    header.UpdateString(L"enc",L"A256GCM");
    success = jwe.SetProtectedHeader(header);
    if (success == false) {
        wprintf(L"%s\n",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.
    const wchar_t *base64Key = L"YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU=";
    success = jwe.SetWrappingKey(0,base64Key,L"base64");
    if (success == false) {
        wprintf(L"%s\n",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(L"context-info-v1",L"utf-8");
    if (success == false) {
        wprintf(L"%s\n",jwe.lastErrorText());
        return;
    }

    CkStringBuilderW sbContent;
    sbContent.Append(L"This is the secret content.");
    CkStringBuilderW sbJwe;
    success = jwe.EncryptSb(sbContent,L"utf-8",sbJwe);
    if (success == false) {
        wprintf(L"%s\n",jwe.lastErrorText());
        return;
    }

    wprintf(L"%s\n",sbJwe.getAsString());
    }