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(Objective-C) URL Signing for Google Maps APIDemonstrates 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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