(Objective-C) Create JWT Using Ed25519 Private Key (EdDSA)

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Demonstrates how to create a JWT using an Ed25519 private key. If the private key is Ed25519, which is an EdDSA algorithm, the JOSE header's "alg" member should be set to "EdDSA".

Note: This example requires Chilkat v9.5.0.95 or greater.

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

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

// Demonstrates how to create a JWT using an Ed25519 private key.

CkoPrivateKey *privKey = [[CkoPrivateKey alloc] init];

// Load an Ed25519 (EdDSA) private key from a PEM file.
BOOL success = [privKey LoadPemFile: @"qa_data/eddsa/ed25519.pem"];
if (success != YES) {
    NSLog(@"%@",privKey.LastErrorText);
    return;
}

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

// Build the JOSE header
CkoJsonObject *jose = [[CkoJsonObject alloc] init];

// -----------------------------------------------------------------
// Note: This example requires Chilkat v9.5.0.95 or greater.
// -----------------------------------------------------------------
success = [jose AppendString: @"alg" value: @"EdDSA"];
success = [jose AppendString: @"typ" value: @"JWT"];

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

// (optional) Set the timestamp of when the JWT was created to now.
int curDateTime = [[jwt GenNumericDate: [NSNumber numberWithInt: 0]] intValue];
success = [claims AddIntAt: [NSNumber numberWithInt: -1] name: @"iat" value: [NSNumber numberWithInt: curDateTime]];

// (optional)  Set the "not process before" timestamp to now.
success = [claims AddIntAt: [NSNumber numberWithInt: -1] name: @"nbf" value: [NSNumber numberWithInt: curDateTime]];

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

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

// Create the JWT token.
NSString *token = [jwt CreateJwtPk: [jose Emit] payload: [claims Emit] key: privKey];

NSLog(@"%@",token);

// Example output:
// eyJhbGciOiJFZERTQSIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJodHRwOi8vZXhhbXBsZS5vcmciLCJzdWIiOiJKb2huIiwiYXVkIjoiaHR0cDovL2V4YW1wbGUuY29tIiwiaWF0IjoxNjg3OTcwNjgyLCJuYmYiOjE2ODc5NzA2ODIsImV4cCI6MTY4Nzk3NDI4Mn0.eyfrDJfuWJSJVJPfAUYb_p_c-LF_YULHGRaZx82MLLjMLCCFEEGckp8icuayf5bLW9ah20LzYYt0JgOBIB0RDg