C#

URL Signing for Google Maps API

See more Encryption Examples

Demonstrates how to sign a URL for the Google Maps API. C#

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

Chilkat.Crypt2 crypt = new Chilkat.Crypt2();

// 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";
crypt.MacAlgorithm = "hmac";

string sig;

// Set the HMAC key (this is the private key provided by Google)
crypt.SetMacKeyEncoded("vNIXE0xscrmjlyV-12Nj_BvUPaw=","modBase64");

// Compute the URL signature
sig = crypt.MacStringENC("/maps/api/geocode/json?address=New+York&sensor=false&client=clientID");

// The result should be KrU1TzVQM7Ur0i8i7K3huiw3MsA=
Debug.WriteLine(sig);