(Objective-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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#import <CkoJsonObject.h>
#import <CkoDateTime.h>
#import <CkoStringBuilder.h>
#import <CkoPublicKey.h>
#import <CkoRsa.h>
#import <NSString.h>

// 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.
CkoJsonObject *json = [[CkoJsonObject alloc] init];
[json UpdateString: @"provider_key" value: @"USER GUID HERE"];
[json UpdateString: @"menu_item" value: @"payment"];
CkoDateTime *dt = [[CkoDateTime alloc] init];
[dt SetFromCurrentSystemTime];
[json UpdateString: @"date_time" value: [dt GetAsUnixTimeStr: NO]];

// 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 = YES;

// Everyware's RSA public key is at:  https://docs.everyware.com/docs/everyware-public-rsa-key
CkoStringBuilder *sb = [[CkoStringBuilder alloc] init];
BOOL bCrlf = YES;
[sb AppendLine: @"-----BEGIN PUBLIC KEY-----" crlf: bCrlf];
[sb AppendLine: @"MIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEAxNbflxUSWQ3XJ1N9dAoh" crlf: bCrlf];
[sb AppendLine: @"k+uaiFsg3wkPi9LGS/mH8DtHBgZxKyz+oQBDtnDd9FDEo0ql7MMgCMsTAv27W5vk" crlf: bCrlf];
[sb AppendLine: @"Pu0rm6zhcTeYquWEuVCS7VtVsyTATr0Z9WhqNeZlIRurovJAXl2jRDX6QeY5dayC" crlf: bCrlf];
[sb AppendLine: @"ubwyG4lBWE4fCakGY6zlh+oaElK0rvblqjYoEg3dn4KPRCYGof8OFxLptHThD4cE" crlf: bCrlf];
[sb AppendLine: @"T30j+utVafhO0HRyJ4iR3Pigb4GXdWBtJEEEWddZJizMkjFQkyUAoYLOT8EJ2TW3" crlf: bCrlf];
[sb AppendLine: @"Tz8SvAuHBUEFcPWTSTMAG/bSp5wrYBTXaeEhx+wrYa60OruHuzgmhzKyQVuYlCNJ" crlf: bCrlf];
[sb AppendLine: @"HdbnassuIRjjSNo25o4AdSlWwpGfBZjAiyEInR+KGpHdhKTxSekJxiwiXUS0UfSG" crlf: bCrlf];
[sb AppendLine: @"prOpd5PzWaAR7DvjLsdmR9XffxvJCVxC735gLK7hDJKjCajDPHVDr8FSL8xMlrq0" crlf: bCrlf];
[sb AppendLine: @"nKxtsHeRl1yzoGrRr12+9MiQnHtpqROTNXcXdwe3v+Vh8V5k8v8oIrcgh1+/N7Bd" crlf: bCrlf];
[sb AppendLine: @"NiRsy1gFHBdu/he/KcDRT/9/acQFMPLQueGfZxUvU5As6pEONjtKX2MUg2fMF6Rc" crlf: bCrlf];
[sb AppendLine: @"sQVVrLzg0g7EcuHGfuPeKfD/716MvS8NU7rX+2soijCSQv/e18PJPMVDlcMXjnup" crlf: bCrlf];
[sb AppendLine: @"PPx1tStemesavFlj1okhS6UCAwEAAQ==" crlf: bCrlf];
[sb AppendLine: @"-----END PUBLIC KEY-----" crlf: bCrlf];

CkoPublicKey *pubkey = [[CkoPublicKey alloc] init];
success = [pubkey LoadFromString: [sb GetAsString]];
if (success == NO) {
    NSLog(@"%@",pubkey.LastErrorText);
    return;
}

CkoRsa *rsa = [[CkoRsa alloc] init];
success = [rsa ImportPublicKeyObj: pubkey];
if (success == NO) {
    NSLog(@"%@",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";

NSString *encryptedJson = [rsa EncryptStringENC: [json Emit] bUsePrivateKey: NO];

// Build the URL
// Such as:  https://portal.everyware.com/Account/LoginMenu?data={Base64Url_encrypted_JSON}
CkoStringBuilder *sbUrl = [[CkoStringBuilder alloc] init];
[sbUrl Append: @"https://portal.everyware.com/Account/LoginMenu?data="];
[sbUrl Append: encryptedJson];

NSLog(@"%@",[sbUrl GetAsString]);