(Unicode C) Everyware API RSA Encrypt JSON

See more RSA Examples

Demonstrates how to RSA encrypt JSON using everyware.com's RSA public key.

For more information, see https://docs.everyware.com/docs/access-iframe#sample-json--encrypted-payload

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#include <C_CkJsonObjectW.h>
#include <C_CkDateTimeW.h>
#include <C_CkStringBuilderW.h>
#include <C_CkPublicKeyW.h>
#include <C_CkRsaW.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkJsonObjectW json;
    HCkDateTimeW dt;
    HCkStringBuilderW sb;
    BOOL bCrlf;
    HCkPublicKeyW pubkey;
    HCkRsaW rsa;
    const wchar_t *encryptedJson;
    HCkStringBuilderW sbUrl;

    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // First build the JSON to be encrypted.
    json = CkJsonObjectW_Create();
    CkJsonObjectW_UpdateString(json,L"provider_key",L"USER GUID HERE");
    CkJsonObjectW_UpdateString(json,L"menu_item",L"payment");
    dt = CkDateTimeW_Create();
    CkDateTimeW_SetFromCurrentSystemTime(dt);
    CkJsonObjectW_UpdateString(json,L"date_time",CkDateTimeW_getAsUnixTimeStr(dt,FALSE));

    // This build JSON like the following:

    // {
    //     "provider_key": "USER GUID HERE",
    //     "menu_item": "payment",
    //     "date_time": "1588163411"
    // }

    // When we sign, we'll want to sign the most compact JSON possible
    CkJsonObjectW_putEmitCompact(json,TRUE);

    // Everyware's RSA public key is at:  https://docs.everyware.com/docs/everyware-public-rsa-key
    sb = CkStringBuilderW_Create();
    bCrlf = TRUE;
    CkStringBuilderW_AppendLine(sb,L"-----BEGIN PUBLIC KEY-----",bCrlf);
    CkStringBuilderW_AppendLine(sb,L"MIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEAxNbflxUSWQ3XJ1N9dAoh",bCrlf);
    CkStringBuilderW_AppendLine(sb,L"k+uaiFsg3wkPi9LGS/mH8DtHBgZxKyz+oQBDtnDd9FDEo0ql7MMgCMsTAv27W5vk",bCrlf);
    CkStringBuilderW_AppendLine(sb,L"Pu0rm6zhcTeYquWEuVCS7VtVsyTATr0Z9WhqNeZlIRurovJAXl2jRDX6QeY5dayC",bCrlf);
    CkStringBuilderW_AppendLine(sb,L"ubwyG4lBWE4fCakGY6zlh+oaElK0rvblqjYoEg3dn4KPRCYGof8OFxLptHThD4cE",bCrlf);
    CkStringBuilderW_AppendLine(sb,L"T30j+utVafhO0HRyJ4iR3Pigb4GXdWBtJEEEWddZJizMkjFQkyUAoYLOT8EJ2TW3",bCrlf);
    CkStringBuilderW_AppendLine(sb,L"Tz8SvAuHBUEFcPWTSTMAG/bSp5wrYBTXaeEhx+wrYa60OruHuzgmhzKyQVuYlCNJ",bCrlf);
    CkStringBuilderW_AppendLine(sb,L"HdbnassuIRjjSNo25o4AdSlWwpGfBZjAiyEInR+KGpHdhKTxSekJxiwiXUS0UfSG",bCrlf);
    CkStringBuilderW_AppendLine(sb,L"prOpd5PzWaAR7DvjLsdmR9XffxvJCVxC735gLK7hDJKjCajDPHVDr8FSL8xMlrq0",bCrlf);
    CkStringBuilderW_AppendLine(sb,L"nKxtsHeRl1yzoGrRr12+9MiQnHtpqROTNXcXdwe3v+Vh8V5k8v8oIrcgh1+/N7Bd",bCrlf);
    CkStringBuilderW_AppendLine(sb,L"NiRsy1gFHBdu/he/KcDRT/9/acQFMPLQueGfZxUvU5As6pEONjtKX2MUg2fMF6Rc",bCrlf);
    CkStringBuilderW_AppendLine(sb,L"sQVVrLzg0g7EcuHGfuPeKfD/716MvS8NU7rX+2soijCSQv/e18PJPMVDlcMXjnup",bCrlf);
    CkStringBuilderW_AppendLine(sb,L"PPx1tStemesavFlj1okhS6UCAwEAAQ==",bCrlf);
    CkStringBuilderW_AppendLine(sb,L"-----END PUBLIC KEY-----",bCrlf);

    pubkey = CkPublicKeyW_Create();
    success = CkPublicKeyW_LoadFromString(pubkey,CkStringBuilderW_getAsString(sb));
    if (success == FALSE) {
        wprintf(L"%s\n",CkPublicKeyW_lastErrorText(pubkey));
        CkJsonObjectW_Dispose(json);
        CkDateTimeW_Dispose(dt);
        CkStringBuilderW_Dispose(sb);
        CkPublicKeyW_Dispose(pubkey);
        return;
    }

    rsa = CkRsaW_Create();
    success = CkRsaW_ImportPublicKeyObj(rsa,pubkey);
    if (success == FALSE) {
        wprintf(L"%s\n",CkRsaW_lastErrorText(rsa));
        CkJsonObjectW_Dispose(json);
        CkDateTimeW_Dispose(dt);
        CkStringBuilderW_Dispose(sb);
        CkPublicKeyW_Dispose(pubkey);
        CkRsaW_Dispose(rsa);
        return;
    }

    // We probably need a base64Url encoded encrypted key.
    // Using straight-up base64 would potenially include chars that are not URL safe (i.e. have special meanings in URLs)
    CkRsaW_putEncodingMode(rsa,L"base64url");

    encryptedJson = CkRsaW_encryptStringENC(rsa,CkJsonObjectW_emit(json),FALSE);

    // Build the URL
    // Such as:  https://portal.everyware.com/Account/LoginMenu?data={Base64Url_encrypted_JSON}
    sbUrl = CkStringBuilderW_Create();
    CkStringBuilderW_Append(sbUrl,L"https://portal.everyware.com/Account/LoginMenu?data=");
    CkStringBuilderW_Append(sbUrl,encryptedJson);

    wprintf(L"%s\n",CkStringBuilderW_getAsString(sbUrl));


    CkJsonObjectW_Dispose(json);
    CkDateTimeW_Dispose(dt);
    CkStringBuilderW_Dispose(sb);
    CkPublicKeyW_Dispose(pubkey);
    CkRsaW_Dispose(rsa);
    CkStringBuilderW_Dispose(sbUrl);

    }