(.NET Core C#) Everyware API RSA Encrypt JSON

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

bool success;

// First build the JSON to be encrypted.
Chilkat.JsonObject json = new Chilkat.JsonObject();
json.UpdateString("provider_key","USER GUID HERE");
json.UpdateString("menu_item","payment");
Chilkat.CkDateTime dt = new Chilkat.CkDateTime();
dt.SetFromCurrentSystemTime();
json.UpdateString("date_time",dt.GetAsUnixTimeStr(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
json.EmitCompact = true;

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

Chilkat.PublicKey pubkey = new Chilkat.PublicKey();
success = pubkey.LoadFromString(sb.GetAsString());
if (success == false) {
    Debug.WriteLine(pubkey.LastErrorText);
    return;
}

Chilkat.Rsa rsa = new Chilkat.Rsa();
success = rsa.ImportPublicKeyObj(pubkey);
if (success == false) {
    Debug.WriteLine(rsa.LastErrorText);
    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)
rsa.EncodingMode = "base64url";

string encryptedJson = rsa.EncryptStringENC(json.Emit(),false);

// Build the URL
// Such as:  https://portal.everyware.com/Account/LoginMenu?data={Base64Url_encrypted_JSON}
Chilkat.StringBuilder sbUrl = new Chilkat.StringBuilder();
sbUrl.Append("https://portal.everyware.com/Account/LoginMenu?data=");
sbUrl.Append(encryptedJson);

Debug.WriteLine(sbUrl.GetAsString());