Encrypt a JWE with a Recipient Public Key

See more JSON Web Encryption (JWE) Examples

Demonstrates Jwe.SetPublicKey, which sets the public key used to encrypt for a recipient. The example uses RSA-OAEP-256 key management with AES-256-GCM content encryption.

The file path is relative to the application's current working directory. An absolute path may also be used. Supply the path appropriate to your own environment.

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

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

    success = FALSE;

    jwe = CkJwe_Create();

    //  Protected header: RSA-OAEP-256 key management with AES-256-GCM content encryption.
    header = CkJsonObject_Create();
    CkJsonObject_UpdateString(header,"alg","RSA-OAEP-256");
    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;
    }

    //  The file path is relative to the application's current working directory.  An absolute path
    //  may also be used.  Supply the path appropriate to your own environment.
    //  Load the recipient's public key.
    pubKey = CkPublicKey_Create();
    success = CkPublicKey_LoadFromFile(pubKey,"qa_data/recipient_pubkey.pem");
    if (success == FALSE) {
        printf("%s\n",CkPublicKey_lastErrorText(pubKey));
        CkJwe_Dispose(jwe);
        CkJsonObject_Dispose(header);
        CkPublicKey_Dispose(pubKey);
        return;
    }

    //  Set the public key used to encrypt for recipient 0.
    success = CkJwe_SetPublicKey(jwe,0,pubKey);
    if (success == FALSE) {
        printf("%s\n",CkJwe_lastErrorText(jwe));
        CkJwe_Dispose(jwe);
        CkJsonObject_Dispose(header);
        CkPublicKey_Dispose(pubKey);
        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);
        CkPublicKey_Dispose(pubKey);
        return;
    }

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


    CkJwe_Dispose(jwe);
    CkJsonObject_Dispose(header);
    CkPublicKey_Dispose(pubKey);

    }