(Objective-C) Base64url Encoding

Base64url encoding is identical to base64 encoding except it uses non-reserved URL characters (e.g. '–' is used instead of '+', and '_' is used instead of '/') and it omits the padding characters.

Note: This example requires Chilkat v11.0.0 or greater.

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#import <CkoPrivateKey.h>
#import <CkoRsa.h>
#import <NSString.h>

BOOL success = NO;

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

CkoPrivateKey *pkey = [[CkoPrivateKey alloc] init];
CkoRsa *rsa = [[CkoRsa alloc] init];
[rsa GenKey: [NSNumber numberWithInt: 1024] privKey: pkey];
[rsa UsePrivateKey: pkey];

NSString *strData = @"This is the string to be signed.";

// Get the signature in base64url
rsa.EncodingMode = @"base64url";
NSString *strSig = [rsa SignStringENC: strData hashAlg: @"sha256"];

NSLog(@"%@",strSig);