C++

URL Signing for Google Maps API

See more Encryption Examples

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

#include <CkCrypt2.h>

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

    CkCrypt2 crypt;

    // 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.put_EncodingMode("modBase64");

    // Set the hash algorithm to sha-1
    crypt.put_HashAlgorithm("sha-1");
    crypt.put_MacAlgorithm("hmac");

    const char *sig = 0;

    // 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=
    std::cout << sig << "\r\n";
    }