(C) Everyware API RSA Encrypt JSON

See more RSA Examples

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

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#include <C_CkJsonObject.h>
#include <C_CkDateTime.h>
#include <C_CkStringBuilder.h>
#include <C_CkPublicKey.h>
#include <C_CkRsa.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkJsonObject json;
    HCkDateTime dt;
    HCkStringBuilder sb;
    BOOL bCrlf;
    HCkPublicKey pubkey;
    HCkRsa rsa;
    const char *encryptedJson;
    HCkStringBuilder 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 = CkJsonObject_Create();
    CkJsonObject_UpdateString(json,"provider_key","USER GUID HERE");
    CkJsonObject_UpdateString(json,"menu_item","payment");
    dt = CkDateTime_Create();
    CkDateTime_SetFromCurrentSystemTime(dt);
    CkJsonObject_UpdateString(json,"date_time",CkDateTime_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
    CkJsonObject_putEmitCompact(json,TRUE);

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

    pubkey = CkPublicKey_Create();
    success = CkPublicKey_LoadFromString(pubkey,CkStringBuilder_getAsString(sb));
    if (success == FALSE) {
        printf("%s\n",CkPublicKey_lastErrorText(pubkey));
        CkJsonObject_Dispose(json);
        CkDateTime_Dispose(dt);
        CkStringBuilder_Dispose(sb);
        CkPublicKey_Dispose(pubkey);
        return;
    }

    rsa = CkRsa_Create();
    success = CkRsa_ImportPublicKeyObj(rsa,pubkey);
    if (success == FALSE) {
        printf("%s\n",CkRsa_lastErrorText(rsa));
        CkJsonObject_Dispose(json);
        CkDateTime_Dispose(dt);
        CkStringBuilder_Dispose(sb);
        CkPublicKey_Dispose(pubkey);
        CkRsa_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)
    CkRsa_putEncodingMode(rsa,"base64url");

    encryptedJson = CkRsa_encryptStringENC(rsa,CkJsonObject_emit(json),FALSE);

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

    printf("%s\n",CkStringBuilder_getAsString(sbUrl));


    CkJsonObject_Dispose(json);
    CkDateTime_Dispose(dt);
    CkStringBuilder_Dispose(sb);
    CkPublicKey_Dispose(pubkey);
    CkRsa_Dispose(rsa);
    CkStringBuilder_Dispose(sbUrl);

    }