(PowerShell) URL Signing for Google Maps API

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

Chilkat .NET Downloads Chilkat .NET Assemblies

Add-Type -Path "C:\chilkat\ChilkatDotNet47-x64\ChilkatDotNet47.dll"

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

$crypt = New-Object 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"

# 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=
$($sig)