Set the JWS Protected Header

See more JSON Web Signatures (JWS) Examples

Demonstrates Jws.SetProtectedHeader, which sets the integrity-protected header for a signer from a JsonObject. The header specifies the signature algorithm (alg).

#import <CkoJws.h>
#import <CkoJsonObject.h>

BOOL success = NO;

CkoJws *jws = [[CkoJws alloc] init];

//  Build the JWS protected header.  The "alg" member names the signature algorithm.
CkoJsonObject *header = [[CkoJsonObject alloc] init];
[header UpdateString: @"alg" value: @"HS256"];

//  Set the protected header for signer index 0.  The protected header is integrity-protected: it is
//  covered by the signature.
success = [jws SetProtectedHeader: [NSNumber numberWithInt: 0] json: header];
if (success == NO) {
    NSLog(@"%@",jws.LastErrorText);
    return;
}

NSLog(@"%@",@"Protected header set.");