Unicode C

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.

Background. This is the in-memory equivalent of SetMacKey, for when the key material is already available as bytes.

Chilkat Unicode C Downloads

Unicode C

#include <C_CkJwsW.h>
#include <C_CkJsonObjectW.h>
#include <C_CkBinDataW.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkJwsW jws;
    HCkJsonObjectW header;
    BOOL bIncludeBom;
    HCkBinDataW bdKey;
    const wchar_t *jwsCompact;

    success = FALSE;

    jws = CkJwsW_Create();

    //  Protected header specifying HMAC-SHA256.
    header = CkJsonObjectW_Create();
    CkJsonObjectW_UpdateString(header,L"alg",L"HS256");
    success = CkJwsW_SetProtectedHeader(jws,0,header);
    if (success == FALSE) {
        wprintf(L"%s\n",CkJwsW_lastErrorText(jws));
        CkJwsW_Dispose(jws);
        CkJsonObjectW_Dispose(header);
        return;
    }

    bIncludeBom = FALSE;
    success = CkJwsW_SetPayload(jws,L"This is the content to sign.",L"utf-8",bIncludeBom);
    if (success == FALSE) {
        wprintf(L"%s\n",CkJwsW_lastErrorText(jws));
        CkJwsW_Dispose(jws);
        CkJsonObjectW_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 = CkBinDataW_Create();
    CkBinDataW_AppendEncoded(bdKey,L"YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU=",L"base64");
    success = CkJwsW_SetMacKeyBd(jws,0,bdKey);
    if (success == FALSE) {
        wprintf(L"%s\n",CkJwsW_lastErrorText(jws));
        CkJwsW_Dispose(jws);
        CkJsonObjectW_Dispose(header);
        CkBinDataW_Dispose(bdKey);
        return;
    }

    jwsCompact = CkJwsW_createJws(jws);
    if (CkJwsW_getLastMethodSuccess(jws) == FALSE) {
        wprintf(L"%s\n",CkJwsW_lastErrorText(jws));
        CkJwsW_Dispose(jws);
        CkJsonObjectW_Dispose(header);
        CkBinDataW_Dispose(bdKey);
        return;
    }

    wprintf(L"%s\n",jwsCompact);


    CkJwsW_Dispose(jws);
    CkJsonObjectW_Dispose(header);
    CkBinDataW_Dispose(bdKey);

    }