(C) URL Signing for Google Maps API

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

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#include <C_CkCrypt2.h>

void ChilkatSample(void)
    {
    HCkCrypt2 crypt;
    BOOL success;
    const char * sig;

    crypt = CkCrypt2_Create();

    //  Any string argument automatically begins the 30-day trial.

    success = CkCrypt2_UnlockComponent(crypt,"Anything for 30-day trial.");
    if (success != TRUE) {
        printf("%s\n",CkCrypt2_lastErrorText(crypt));
        return;
    }

    //  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.
    CkCrypt2_putEncodingMode(crypt,"modBase64");

    //  NOTE: At the time of this writing, the "modBase64" encoding mode is
    //  available in the pre-release build only.  Send email to
    //  support@chilkatsoft.com if you need a pre-release.  This feature will be
    //  included in the next official release.

    //  Set the hash algorithm to sha-1
    CkCrypt2_putHashAlgorithm(crypt,"sha-1");

    //  Set the HMAC key (this is the private key provided by Google)
    CkCrypt2_SetHmacKeyEncoded(crypt,"vNIXE0xscrmjlyV-12Nj_BvUPaw=","modBase64");

    //  Compute the URL signature
    sig = CkCrypt2_hmacStringENC(crypt,"/maps/api/geocode/json?address=New+York&sensor=false&client=clientID");

    //  The result should be KrU1TzVQM7Ur0i8i7K3huiw3MsA=
    printf("%s\n",sig);

    CkCrypt2_Dispose(crypt);

    }