PowerShell Requires Chilkat v11.0.0+

Validate JWS Using RSASSA-PKCS1-v1_5 SHA-256

See more JSON Web Signatures (JWS) Examples

Validates a JSON Web Signature (JWS) that uses RSASSA-PKCS1-v1_5 SHA-256. 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.

#  This example takes a JSON signature in compact serialization format,
#  and uses an RSA public key to validate and recover the protected header and payload.

#  We only need a public key for signature validation.  This is the RSA public key
#  that is used:

#       {"kty":"RSA", 
#        "n":"ofgWCuLjybRlzo0tZWJjNiuSfb4p4fAkd_wWJcyQoTbji9k0l8W26mPddx
#             HmfHQp-Vaw-4qPCJrcS2mJPMEzP1Pt0Bm4d4QlL-yRT-SFd2lZS-pCgNMs
#             D1W_YpRPEwOWvG6b32690r2jZ47soMZo9wGzjb_7OMg0LOL-bSf63kpaSH
#             SXndS5z5rexMdbBYUsLA9e-KXBdQOS-UTo7WTBEMa2R2CapHg665xsmtdV
#             MTBQY4uDZlxvb3qCo5ZwKh9kG4LT6_I5IhlJH7aGhyxXFvUK-DWNmoudF8
#             NAco9_h9iaGNj8q2ethFkMLs91kzk2PAcDTW9gb54h4FRWyuXpoQ", 
#        "e":"AQAB"
#       }

$sbPubKey = New-Object Chilkat.StringBuilder
$sbPubKey.Append("{`"kty`":`"RSA`",")
$sbPubKey.Append("`"n`":`"ofgWCuLjybRlzo0tZWJjNiuSfb4p4fAkd_wWJcyQoTbji9k0l8W26mPddx")
$sbPubKey.Append("HmfHQp-Vaw-4qPCJrcS2mJPMEzP1Pt0Bm4d4QlL-yRT-SFd2lZS-pCgNMs")
$sbPubKey.Append("D1W_YpRPEwOWvG6b32690r2jZ47soMZo9wGzjb_7OMg0LOL-bSf63kpaSH")
$sbPubKey.Append("SXndS5z5rexMdbBYUsLA9e-KXBdQOS-UTo7WTBEMa2R2CapHg665xsmtdV")
$sbPubKey.Append("MTBQY4uDZlxvb3qCo5ZwKh9kG4LT6_I5IhlJH7aGhyxXFvUK-DWNmoudF8")
$sbPubKey.Append("NAco9_h9iaGNj8q2ethFkMLs91kzk2PAcDTW9gb54h4FRWyuXpoQ`",")
$sbPubKey.Append("`"e`":`"AQAB`"")
$sbPubKey.Append("}")

$pubKey = New-Object Chilkat.PublicKey
$success = $pubKey.LoadFromString($sbPubKey.GetAsString())
if ($success -eq $false) {
    $($pubKey.LastErrorText)
    exit
}

$jws = New-Object Chilkat.Jws

#  Set the RSA public key:
$signatureIndex = 0
$jws.SetPublicKey($signatureIndex,$pubKey)

#  Load the JWS.
$sbJws = New-Object Chilkat.StringBuilder
$sbJws.Append("eyJhbGciOiJSUzI1NiJ9")
$sbJws.Append(".")
$sbJws.Append("eyJpc3MiOiJqb2UiLA0KICJleHAiOjEzMDA4MTkzODAsDQogImh0dHA6Ly9leGFt")
$sbJws.Append("cGxlLmNvbS9pc19yb290Ijp0cnVlfQ")
$sbJws.Append(".")
$sbJws.Append("cC4hiUPoj9Eetdgtv3hF80EGrhuB__dzERat0XF9g2VtQgr9PJbu3XOiZj5RZmh7")
$sbJws.Append("AAuHIm4Bh-0Qc_lF5YKt_O8W2Fp5jujGbds9uJdbF9CUAr7t1dnZcAcQjbKBYNX4")
$sbJws.Append("BAynRFdiuB--f_nZLgrnbyTyWzO75vRK5h6xBArLIARNPvkSjtQBMHlb1L07Qe7K")
$sbJws.Append("0GarZRmB_eSN9383LcOLn6_dO--xi12jzDwusC-eOkHWEsqtFZESc6BfI7noOPqv")
$sbJws.Append("hJ1phCnvWh6IeYI2w9QOYEUipUTI8np6LbgGY9Fs98rqVt5AXLIhWkWywlVmtVrB")
$sbJws.Append("p0igcN_IoypGlUPQGe77Rw")

$success = $jws.LoadJwsSb($sbJws)
if ($success -eq $false) {
    $($jws.LastErrorText)
    exit
}

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

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

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

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

#  Examine the protected header:

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

$joseHeader.EmitCompact = $false

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

#  Output:

#  	Signature validated.
#  	--
#  	Recovered content:
#  	{"iss":"joe", 
#  	 "exp":1300819380,
#  	 "http://example.com/is_root":true}
#  	--
#  	Protected (JOSE) header:
#  	{ 
#  	  "alg": "RS256"
#  	}