(VBScript) Get ECC Private Key in JWK Format (JSON Web Key)

Demonstrates how to get an ECC private key in JWK (JSON Web Key) format.

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

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

Dim fso, outFile
Set fso = CreateObject("Scripting.FileSystemObject")
'Create a Unicode (utf-16) output text file.
Set outFile = fso.CreateTextFile("output.txt", True, True)

' Note: This example requires Chilkat v9.5.0.66 or later.

' Load a PEM file into memory.
' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.StringBuilder")
set sbPem = CreateObject("Chilkat.StringBuilder")
success = sbPem.LoadFile("qa_data/pem/ecc_privKey.pem","utf-8")
If (success <> 1) Then
    outFile.WriteLine("Failed to load PEM file.")
    WScript.Quit
End If

' Load the PEM into a private key object.
' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.PrivateKey")
set privKey = CreateObject("Chilkat.PrivateKey")
success = privKey.LoadPem(sbPem.GetAsString())
If (success <> 1) Then
    outFile.WriteLine(privKey.LastErrorText)
    WScript.Quit
End If

' Get the private key in JWK format:
jwk = privKey.GetJwk()

' The GetJwk method will return the JWK in the most compact JSON format possible,
' as a single line with no extra whitespace.  To get a more human-readable JWK (for this example),
' load into a Chilkat JSON object and emit non-compact:

' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.JsonObject")
set json = CreateObject("Chilkat.JsonObject")
success = json.Load(jwk)
json.EmitCompact = 0
outFile.WriteLine("ECC Private Key in JWK format:")
outFile.WriteLine(json.Emit())

' Sample output:
' { 
'   "kty": "EC",
'   "crv": "P-256",
'   "x": "oBUyo8CQAFPeYPvv78ylh5MwFZjTCLQeb042TjiMJxE",
'   "y": "vvQyxZkUjJQUPU_0bCy3Pj5qQdfu8jwEfqEeYGZ95CU",
'   "d": "EbVzfPnZPxfAyxqEZV05laAoJAl-_6Xt2O4mOB611sM"
' }
' 

' Additional information can be added like this:
success = json.AppendString("use","enc")
success = json.AppendString("kid","123ABC")

' Now examine the JSON:
outFile.WriteLine(json.Emit())

' { 
'   "kty": "EC",
'   "crv": "P-256",
'   "x": "oBUyo8CQAFPeYPvv78ylh5MwFZjTCLQeb042TjiMJxE",
'   "y": "vvQyxZkUjJQUPU_0bCy3Pj5qQdfu8jwEfqEeYGZ95CU",
'   "d": "EbVzfPnZPxfAyxqEZV05laAoJAl-_6Xt2O4mOB611sM",
'   "use": "enc",
'   "kid": "123ABC"
' }

outFile.Close