DataFlex

URL Signing for Google Maps API

See more Encryption Examples

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

Use ChilkatAx-win32.pkg

Procedure Test
    Handle hoCrypt
    String sSig
    Boolean iSuccess

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

    Get Create (RefClass(cComChilkatCrypt2)) To hoCrypt
    If (Not(IsComObjectCreated(hoCrypt))) Begin
        Send CreateComObject of hoCrypt
    End

    // 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.
    Set ComEncodingMode Of hoCrypt To "modBase64"

    // Set the hash algorithm to sha-1
    Set ComHashAlgorithm Of hoCrypt To "sha-1"
    Set ComMacAlgorithm Of hoCrypt To "hmac"

    // Set the HMAC key (this is the private key provided by Google)
    Get ComSetMacKeyEncoded Of hoCrypt "vNIXE0xscrmjlyV-12Nj_BvUPaw=" "modBase64" To iSuccess

    // Compute the URL signature
    Get ComMacStringENC Of hoCrypt "/maps/api/geocode/json?address=New+York&sensor=false&client=clientID" To sSig

    // The result should be KrU1TzVQM7Ur0i8i7K3huiw3MsA=
    Showln sSig


End_Procedure