Sign a JWS with an HMAC Key from BinData

See more JSON Web Signatures (JWS) Examples

Demonstrates Jws.SetMacKeyBd, which sets the symmetric MAC key for a signature from the raw bytes in a BinData.

#include <C_CkJws.h>
#include <C_CkJsonObject.h>
#include <C_CkBinData.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkJws jws;
    HCkJsonObject header;
    BOOL bIncludeBom;
    HCkBinData bdKey;
    const char *jwsCompact;

    success = FALSE;

    jws = CkJws_Create();

    //  Protected header specifying HMAC-SHA256.
    header = CkJsonObject_Create();
    CkJsonObject_UpdateString(header,"alg","HS256");
    success = CkJws_SetProtectedHeader(jws,0,header);
    if (success == FALSE) {
        printf("%s\n",CkJws_lastErrorText(jws));
        CkJws_Dispose(jws);
        CkJsonObject_Dispose(header);
        return;
    }

    bIncludeBom = FALSE;
    success = CkJws_SetPayload(jws,"This is the content to sign.","utf-8",bIncludeBom);
    if (success == FALSE) {
        printf("%s\n",CkJws_lastErrorText(jws));
        CkJws_Dispose(jws);
        CkJsonObject_Dispose(header);
        return;
    }

    //  Set the symmetric MAC key for signature 0 from the raw bytes in a BinData.  In production, obtain
    //  the key material from a secure source.
    bdKey = CkBinData_Create();
    CkBinData_AppendEncoded(bdKey,"YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU=","base64");
    success = CkJws_SetMacKeyBd(jws,0,bdKey);
    if (success == FALSE) {
        printf("%s\n",CkJws_lastErrorText(jws));
        CkJws_Dispose(jws);
        CkJsonObject_Dispose(header);
        CkBinData_Dispose(bdKey);
        return;
    }

    jwsCompact = CkJws_createJws(jws);
    if (CkJws_getLastMethodSuccess(jws) == FALSE) {
        printf("%s\n",CkJws_lastErrorText(jws));
        CkJws_Dispose(jws);
        CkJsonObject_Dispose(header);
        CkBinData_Dispose(bdKey);
        return;
    }

    printf("%s\n",jwsCompact);


    CkJws_Dispose(jws);
    CkJsonObject_Dispose(header);
    CkBinData_Dispose(bdKey);

    }