(Objective-C) Create JWT using Smart Card

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Demonstrates how to create a JWT using an RSA private key and certificate on a smart card. This is for JOSE headers with an "alg" of RS256, RS384, or RS512. When RSA is used, the private key signs (creates) the JWT, and the public key is for verification.

This example also demonstrates how to include time constraints:

• nbf: Not Before Time
• exp: Expiration Time
• iat: Issue At Time

Note: This example requires Chilkat v9.5.0.99 or later.

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#import <CkoJwt.h>
#import <CkoCert.h>
#import <CkoJsonObject.h>
#import <NSString.h>

// Demonstrates how to create a JWT using an RSA private key and certificate on a smart card.

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

CkoJwt *jwt = [[CkoJwt alloc] init];
CkoCert *cert = [[CkoCert alloc] init];

BOOL success = [cert LoadFromSmartcard: @""];
if (success == NO) {
    NSLog(@"%@",cert.LastErrorText);
    return;
}

// Build the JOSE header
CkoJsonObject *jose = [[CkoJsonObject alloc] init];
// Use RS256.  Pass the string "RS384" or "RS512" to use RSA with SHA-384 or SHA-512.
[jose UpdateString: @"alg" value: @"RS256"];
[jose UpdateString: @"typ" value: @"JWT"];
[jose UpdateString: @"x5c[0]" value: [cert GetEncoded]];

// Now build the JWT claims (also known as the payload)
CkoJsonObject *claims = [[CkoJsonObject alloc] init];
[claims UpdateString: @"iss" value: @"http://example.org"];
[claims UpdateString: @"sub" value: @"John"];
[claims UpdateString: @"aud" value: @"http://example.com"];

// Set the timestamp of when the JWT was created to now.
int curDateTime = [[jwt GenNumericDate: [NSNumber numberWithInt: 0]] intValue];
[claims UpdateInt: @"iat" value: [NSNumber numberWithInt: curDateTime]];

// Set the "not process before" timestamp to now.
[claims UpdateInt: @"nbf" value: [NSNumber numberWithInt: curDateTime]];

// Set the timestamp defining an expiration time (end time) for the token
// to be now + 1 hour (3600 seconds)
[claims UpdateInt: @"exp" value: [NSNumber numberWithInt: (curDateTime + 3600)]];

// Produce the smallest possible JWT:
jwt.AutoCompact = YES;

// Create the JWT token.  This is where the RSA signature is created.
NSString *token = [jwt CreateJwtCert: [jose Emit] payload: [claims Emit] cert: cert];

NSLog(@"%@",token);