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VBScript Examples

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(VBScript) 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.

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

Dim fso, outFile
Set fso = CreateObject("Scripting.FileSystemObject")
Set outFile = fso.CreateTextFile("output.txt", True)

'  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.

set sbEccJwk = CreateObject("Chilkat_9_5_0.StringBuilder")
success = sbEccJwk.Append("{""kty"":""EC"",")
success = sbEccJwk.Append("""crv"":""P-256"",")
success = sbEccJwk.Append("""x"":""f83OJ3D2xF1Bg8vub9tLe1gHMzV76e8Tus9uPHvRVEU"",")
success = sbEccJwk.Append("""y"":""x_FEzRu9m36HLN_tue659LNpXW6pCyStikYjKIWI5a0"",")
success = sbEccJwk.Append("""d"":""jpsQnnGQmL-YBIffH1136cspYG6-0iY7X1fCE9-E9LI""")
success = sbEccJwk.Append("}")

set eccKey = CreateObject("Chilkat_9_5_0.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 <> 1) Then
    outFile.WriteLine(eccKey.LastErrorText)
    WScript.Quit
End If

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

set jwsProtHdr = CreateObject("Chilkat_9_5_0.JsonObject")
success = jwsProtHdr.AppendString("alg","ES256")

set jwsUnprotHdr = CreateObject("Chilkat_9_5_0.JsonObject")
success = jwsUnprotHdr.AppendString("kid","myEcKey")

'  ---------------------------------------------------
set jws = CreateObject("Chilkat_9_5_0.Jws")

success = jws.SetProtectedHeader(0,jwsProtHdr)
success = jws.SetUnprotectedHeader(0,jwsUnprotHdr)

success = jws.SetPrivateKey(0,eccKey)

bIncludeBom = 0
payloadStr = "In our village, folks say God crumbles up the old moon into stars."
success = jws.SetPayload(payloadStr,"utf-8",bIncludeBom)

'  ---------------------------------------------------
'  Create the JWS.
'  Indicate we prefer the non-compact, flattened serialization.
jws.PreferCompact = 0
jws.PreferFlattened = 1

jwsStr = jws.CreateJws()
If (jws.LastMethodSuccess <> 1) Then
    outFile.WriteLine(jws.LastErrorText)
    WScript.Quit
End If

'  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..
set json = CreateObject("Chilkat_9_5_0.JsonObject")
success = json.Load(jwsStr)
json.EmitCompact = 0
outFile.WriteLine(json.Emit())

'  Sample output:

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

outFile.Close

 

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