(PowerShell) Create JWS using the Flattened JSON Serialization Format

Creates a JSON Web Signature (JWS) containing 1 signature and output using the flattened JSON serialization format.

Note: This example requires Chilkat v9.5.0.66 or greater.

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Add-Type -Path "C:\chilkat\ChilkatDotNet47-9.5.0-x64\ChilkatDotNet47.dll"

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

# Note: This example requires Chilkat v9.5.0.66 or greater.

# The JWS to be created will contain one signature using an ECDSA key.

$sbEccJwk = New-Object Chilkat.StringBuilder
$sbEccJwk.Append("{`"kty`":`"EC`",")
$sbEccJwk.Append("`"crv`":`"P-256`",")
$sbEccJwk.Append("`"x`":`"f83OJ3D2xF1Bg8vub9tLe1gHMzV76e8Tus9uPHvRVEU`",")
$sbEccJwk.Append("`"y`":`"x_FEzRu9m36HLN_tue659LNpXW6pCyStikYjKIWI5a0`",")
$sbEccJwk.Append("`"d`":`"jpsQnnGQmL-YBIffH1136cspYG6-0iY7X1fCE9-E9LI`"")
$sbEccJwk.Append("}")

$eccKey = New-Object Chilkat.PrivateKey
# Note: This example loads the ECDSA key from JWK format.  Any format can be loaded
# into the private key object. (See the online reference documentation..)
$success = $eccKey.LoadJwk($sbEccJwk.GetAsString())
if ($success -ne $true) {
    $($eccKey.LastErrorText)
    exit
}

# ---------------------------------------------------
# Prepare both a protected and unprotected header.

$jwsProtHdr = New-Object Chilkat.JsonObject
$jwsProtHdr.AppendString("alg","ES256")

$jwsUnprotHdr = New-Object Chilkat.JsonObject
$jwsUnprotHdr.AppendString("kid","myEcKey")

# ---------------------------------------------------
$jws = New-Object Chilkat.Jws

$jws.SetProtectedHeader(0,$jwsProtHdr)
$jws.SetUnprotectedHeader(0,$jwsUnprotHdr)

$jws.SetPrivateKey(0,$eccKey)

$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.
# Indicate we prefer the non-compact, flattened serialization.
$jws.PreferCompact = $false
$jws.PreferFlattened = $true

$jwsStr = $jws.CreateJws()
if ($jws.LastMethodSuccess -ne $true) {
    $($jws.LastErrorText)
    exit
}

# The jwsStr is contains the flattened JSON in the smallest possible size, which is a single line.
# To get in human-readable format, load into a Chilkat JSON object and emit..
$json = New-Object Chilkat.JsonObject
$json.Load($jwsStr)
$json.EmitCompact = $false
$($json.Emit())

# Sample output:

# { 
#   "payload": "SW4gb3VyIHZpbGxhZ2UsIGZvbGtzIHNheSBHb2QgY3J1bWJsZXMgdXAgdGhlIG9sZCBtb29uIGludG8gc3RhcnMu",
#   "protected": "eyJhbGciOiJFUzI1NiJ9",
#   "header": { 
#     "kid": "myEcKey"
#   },
#   "signature": "b7V2UpDPytr-kMnM_YjiQ3E0J2ucOI9LYA7mt57vccrK1rb84j9areqgQcJwOA00aWGoz4hf6sMTBfobdcJEGg"
# }