(Objective-C) URL Signing for Google Maps API
Demonstrates how to sign a URL for the Google Maps API.
#import <CkoCrypt2.h>
#import <NSString.h>
// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.
CkoCrypt2 *crypt = [[CkoCrypt2 alloc] init];
// The output will be modified Base64.
// Modified Base64 for URLs replaces the '+' and '/' characters
// of standard Base64 with '-' and '_' respectively, so that these
// Base64 signatures no longer need to be URL-encoded.
crypt.EncodingMode = @"modBase64";
// Set the hash algorithm to sha-1
crypt.HashAlgorithm = @"sha-1";
NSString *sig = 0;
// Set the HMAC key (this is the private key provided by Google)
[crypt SetHmacKeyEncoded: @"vNIXE0xscrmjlyV-12Nj_BvUPaw=" encoding: @"modBase64"];
// Compute the URL signature
sig = [crypt HmacStringENC: @"/maps/api/geocode/json?address=New+York&sensor=false&client=clientID"];
// The result should be KrU1TzVQM7Ur0i8i7K3huiw3MsA=
NSLog(@"%@",sig);
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