PowerShell

Create a JWS

See more JSON Web Signatures (JWS) Examples

Demonstrates Jws.CreateJws, which creates and returns a JWS from the current payload, headers, and signing key.

Background. JWS (JSON Web Signature) integrity-protects a payload with a signature or MAC. The header alg names the algorithm; this example uses HMAC-SHA256 (HS256) with a symmetric MAC key.

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

$success = $false

$jws = New-Object Chilkat.Jws

#  Set the protected header for signer 0, specifying the signature algorithm (alg).
$header = New-Object Chilkat.JsonObject
$header.UpdateString("alg","HS256")
$success = $jws.SetProtectedHeader(0,$header)
if ($success -eq $false) {
    $($jws.LastErrorText)
    exit
}

#  Set the payload to be signed.
$bIncludeBom = $false
$success = $jws.SetPayload("This is the content to sign.","utf-8",$bIncludeBom)
if ($success -eq $false) {
    $($jws.LastErrorText)
    exit
}

#  Provide the HMAC key (base64) for signer 0.  In production, obtain the key from a secure source
#  rather than hard-coding it.
$base64Key = "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU="
$success = $jws.SetMacKey(0,$base64Key,"base64")
if ($success -eq $false) {
    $($jws.LastErrorText)
    exit
}

#  Create the JWS from the current payload, headers, and signing key.  The returned string is the
#  JWS (compact serialization by default).
$jwsCompact = $jws.CreateJws()
if ($jws.LastMethodSuccess -eq $false) {
    $($jws.LastErrorText)
    exit
}

$($jwsCompact)