Lua

URL Signing for Google Maps API

See more Encryption Examples

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

local chilkat = require("chilkat")

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

local crypt = chilkat.Crypt2.new()

-- 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.encoding_mode = "modBase64"

-- Set the hash algorithm to sha-1
crypt.hash_algorithm = "sha-1"
crypt.mac_algorithm = "hmac"

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

-- Compute the URL signature
local sig = crypt:mac_string_enc("/maps/api/geocode/json?address=New+York&sensor=false&client=clientID")

-- The result should be KrU1TzVQM7Ur0i8i7K3huiw3MsA=
print(sig)