VBScript

Get ECC Public Key in JWK Format (JSON Web Key)

See more ECC Examples

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

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

VBScript

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

success = 0

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

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

' Load the PEM into a public key object.
set pubKey = CreateObject("Chilkat.PublicKey")
success = pubKey.LoadFromString(sbPem.GetAsString())
If (success <> 1) Then
    outFile.WriteLine(pubKey.LastErrorText)
    WScript.Quit
End If

' Get the public key in JWK format:
jwk = pubKey.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:

set json = CreateObject("Chilkat.JsonObject")
success = json.Load(jwk)
json.EmitCompact = 0
outFile.WriteLine("ECC Public Key in JWK format:")
outFile.WriteLine(json.Emit())

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

outFile.Close