Encrypt a JWE with a Symmetric Wrapping Key

See more JSON Web Encryption (JWE) Examples

Demonstrates Jwe.SetWrappingKey, which sets the symmetric key-wrapping key for a recipient. The key bytes are supplied in a named encoding such as hex or base64.

#include <C_CkJwe.h>
#include <C_CkJsonObject.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkJwe jwe;
    HCkJsonObject header;
    const char *base64Key;
    const char *jweCompact;

    success = FALSE;

    jwe = CkJwe_Create();

    //  Protected header: AES key-wrap with AES-256-GCM content encryption.
    header = CkJsonObject_Create();
    CkJsonObject_UpdateString(header,"alg","A256KW");
    CkJsonObject_UpdateString(header,"enc","A256GCM");
    success = CkJwe_SetProtectedHeader(jwe,header);
    if (success == FALSE) {
        printf("%s\n",CkJwe_lastErrorText(jwe));
        CkJwe_Dispose(jwe);
        CkJsonObject_Dispose(header);
        return;
    }

    //  Set the symmetric key-wrapping key for recipient 0.  The key bytes are provided in the named
    //  encoding (here base64).  In production, obtain the key from a secure source rather than hard-coding
    //  it.
    base64Key = "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU=";
    success = CkJwe_SetWrappingKey(jwe,0,base64Key,"base64");
    if (success == FALSE) {
        printf("%s\n",CkJwe_lastErrorText(jwe));
        CkJwe_Dispose(jwe);
        CkJsonObject_Dispose(header);
        return;
    }

    jweCompact = CkJwe_encrypt(jwe,"This is the secret content.","utf-8");
    if (CkJwe_getLastMethodSuccess(jwe) == FALSE) {
        printf("%s\n",CkJwe_lastErrorText(jwe));
        CkJwe_Dispose(jwe);
        CkJsonObject_Dispose(header);
        return;
    }

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


    CkJwe_Dispose(jwe);
    CkJsonObject_Dispose(header);

    }