PowerShell Requires Chilkat v11.5.0+

Create JWS Using Private Key on a Smart Card

See more JSON Web Signatures (JWS) Examples

Creates and validates a JSON Web Signature (JWS) using the private key associated with a certificate on a smart card. PowerShell

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

$success = $false

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

#  Load the certificate from a smart card.
$cert = New-Object Chilkat.Cert

#  Set the smarcard PIN prior to loading
$cert.SmartCardPin = "123456"

#  Detect the connected smartcard or USB security token and load the default certificate.
$success = $cert.LoadFromSmartcard("")
if ($success -eq $false) {
    $($cert.LastErrorText)
    exit
}

#  Note: Chilkat provides many different ways to load a certificate from a smartcard or USB token,
#  such as selecting a certificate if the card contains multiple certificates with private keys,
#  or working with lower-level PKCS11 or ScMinidriver API's (both of which Chilkat provides).

#  Create the JWS Protected Header
$jwsProtHdr = New-Object Chilkat.JsonObject

if ($cert.IsEcdsa() -eq $true) {
    $jwsProtHdr.AppendString("alg","ES256")
}
else {
    $jwsProtHdr.AppendString("alg","RS256")
}

$jws = New-Object Chilkat.Jws

#  Set the protected header:
$signatureIndex = 0
$jws.SetProtectedHeader($signatureIndex,$jwsProtHdr)

#  Provide the private key via the certificate.
#  This requires Chilkat v11.5.0 or greater.
$jws.SetSigningCert($signatureIndex,$cert)

#  Set the payload.
$bIncludeBom = $false
$payloadStr = "In our village, folks say God crumbles up the old moon into stars."
$jws.SetPayload($payloadStr,"utf-8",$bIncludeBom)

#  Create the JWS
#  By default, the compact serialization is used.
$jwsCompact = $jws.CreateJws()
if ($jws.LastMethodSuccess -eq $false) {
    $($jws.LastErrorText)
    exit
}

$("JWS: " + $jwsCompact)

#  sample output:
#  JWS: eyJhbGciOiJQUzI1NiJ9.SW4gb3VyIHZpbGxhZ2UsIGZvbGtzIHNheSBHb2QgY3J1bWJsZXMgdXAgdGhlIG9sZCBtb29uIGludG8gc3RhcnMu.TRWhwRo5dMv9-8OzrInfJTwmUGYgjLfHk8lqF072ND-FmLWEBnUTOpY8oJXp8FdWw2SalbdOeNlrtlJjwk4XK8Ql2iJ_2qMCtxsvLPhKBOqFoAF4aBvTOEDVJDxf0DaBSiydEEtfTVV2iwBcjWabu5J2XieR5y7QZQtuHsn7T3qKBvCcCejN3Y2oqAT3qMHvu1fTms1r_91wBn_K7Wjd9UkZ1n02qQcUHJznR_OF2BgN7_KWIDAF9ZS9keoju2NPpPelO4yxa2XUPnehY3G7dHKoCxUEQR4d2Xc5voqDASTVCDqQS4PVOZdvT3Ein6-SanAlCwbWBbkvT8g6-5PImQ

#  Now load the JWS, validate, and recover the original text.
$jws2 = New-Object Chilkat.Jws

#  Load the JWS.
$success = $jws2.LoadJws($jwsCompact)

$pubKey = New-Object Chilkat.PublicKey
$cert.GetPublicKey($pubKey)

#  Set the public key used for validation.
$signatureIndex = 0
$jws2.SetPublicKey($signatureIndex,$pubKey)

#  Validate the 1st (and only) signature at index 0..
$v = $jws2.Validate($signatureIndex)
if ($v -lt 0) {
    #  Perhaps Chilkat was not unlocked or the trial expired..
    $("Method call failed for some other reason.")
    $($jws2.LastErrorText)
    exit
}

if ($v -eq 0) {
    $("Invalid signature.  The key was incorrect, the JWS was invalid, or both.")
    exit
}

#  If we get here, the signature was validated..
$("Signature validated.")

#  Recover the original content:
$($jws2.GetPayload("utf-8"))

#  Examine the protected header:

$joseHeader = New-Object Chilkat.JsonObject
$success = $jws2.GetProtectedH($signatureIndex,$joseHeader)
if ($success -eq $false) {
    $($jws2.LastErrorText)
    exit
}

$joseHeader.EmitCompact = $false

$("Protected (JOSE) header:")
$($joseHeader.Emit())

#  Output:

#  	Signature validated.
#  	In our village, folks say God crumbles up the old moon into stars.
#  	Protected (JOSE) header:
#  	{ 
#  	  "alg": "RS256"
#  	}