PowerShell Requires Chilkat v11.0.0+

Walmart Partner API Authentication (Generate a Signature for a Request)

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Demonstrates how to generate a signature for a Walmart Partner REST API call. PowerShell

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

$success = $false

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

$consumerId = "b68d2a72...."
$baseUrl = "https://marketplace.walmartapis.com/v2/feeds"
#  This is your Base64 encoded private key
$privateEncodedStr = "MIICeAIBADANBgkqhkiG9w0BAQEFAA......"
$httpMethod = "GET"

#  We need a timestamp in decimal string form representing the number of milliseconds since Jan 01 1970 UTC.
$dt = New-Object Chilkat.CkDateTime
#  Set bLocal = $true for a timestamp in the local timezone.  Set bLocal = $false for a UTC timestamp.
$bLocal = $false
#  This gets the timestamp in seconds, not milliseconds.
$timeStampVal = $dt.GetAsUnixTime($bLocal)

#  Build the string to sign.
$sbStringToSign = New-Object Chilkat.StringBuilder
$sbStringToSign.Append($consumerId)
$sbStringToSign.Append("`n")
$sbStringToSign.Append($baseUrl)
$sbStringToSign.Append("`n")
$sbStringToSign.Append($httpMethod)
$sbStringToSign.Append("`n")
$sbStringToSign.AppendInt($timeStampVal)
#  We add three zero's so that the timestamp value is in milliseconds.
#  We don't care about accuracy down to less than a second.
#  All the server cares about is that the request was signed at the current date/time
#  within some reasonable margin of error (to account for systems having clocks
#  that may be slightly different).
$sbStringToSign.Append("000`n")

$privKey = New-Object Chilkat.PrivateKey
#  Load the private key into a private key object.
#  Note: Technically the private key is not PEM because it lacks the header/footer strings
#  used for PEM.  However, the LoadPem method will still accept it and load it correctly.
$success = $privKey.LoadPem($privateEncodedStr)
if ($success -eq $false) {
    $($privKey.LastErrorText)
    exit
}

$rsa = New-Object Chilkat.Rsa
$success = $rsa.UsePrivateKey($privKey)
if ($success -eq $false) {
    $($rsa.LastErrorText)
    exit
}

#  We want a base64 signature string.
$rsa.EncodingMode = "base64"

$signatureString = $rsa.SignStringENC($sbStringToSign.GetAsString(),"SHA256")
if ($rsa.LastMethodSuccess -eq $false) {
    $($rsa.LastErrorText)
    exit
}

$("Signature String: " + $signatureString)