Unicode C++

Create a JWS into a StringBuilder

See more JSON Web Signatures (JWS) Examples

Demonstrates Jws.CreateJwsSb, which creates a JWS and writes it into a StringBuilder.

Background. JWS (JSON Web Signature) integrity-protects a payload with a signature or MAC. The header alg names the algorithm; this example uses HMAC-SHA256 (HS256) with a symmetric MAC key.

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Unicode C++

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

void ChilkatSample(void)
    {
    bool success = false;

    CkJwsW jws;

    //  Set the protected header for signer 0, specifying the signature algorithm (alg).
    CkJsonObjectW header;
    header.UpdateString(L"alg",L"HS256");
    success = jws.SetProtectedHeader(0,header);
    if (success == false) {
        wprintf(L"%s\n",jws.lastErrorText());
        return;
    }

    //  Set the payload to be signed.
    bool bIncludeBom = false;
    success = jws.SetPayload(L"This is the content to sign.",L"utf-8",bIncludeBom);
    if (success == false) {
        wprintf(L"%s\n",jws.lastErrorText());
        return;
    }

    //  Provide the HMAC key (base64) for signer 0.  In production, obtain the key from a secure source
    //  rather than hard-coding it.
    const wchar_t *base64Key = L"YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU=";
    success = jws.SetMacKey(0,base64Key,L"base64");
    if (success == false) {
        wprintf(L"%s\n",jws.lastErrorText());
        return;
    }

    //  Create the JWS and write it into a StringBuilder.
    CkStringBuilderW sbJws;
    success = jws.CreateJwsSb(sbJws);
    if (success == false) {
        wprintf(L"%s\n",jws.lastErrorText());
        return;
    }

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