(VB.NET) Get RSA Public Key in JWK Format (JSON Web Key)

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

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

Chilkat .NET Downloads Chilkat .NET Framework Chilkat for .NET Core

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

' Load a PEM file into memory.
Dim sbPem As New Chilkat.StringBuilder
Dim success As Boolean = sbPem.LoadFile("qa_data/pem/rsa_public.pem","utf-8")
If (success <> True) Then
    Debug.WriteLine("Failed to load PEM file.")
    Exit Sub
End If


' Load the PEM into a public key object.
Dim pubKey As New Chilkat.PublicKey
success = pubKey.LoadFromString(sbPem.GetAsString())
If (success <> True) Then
    Debug.WriteLine(pubKey.LastErrorText)
    Exit Sub
End If


' Get the public key in JWK format:
Dim jwk As String = 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:

Dim json As New Chilkat.JsonObject
json.Load(jwk)
json.EmitCompact = False
Debug.WriteLine("RSA Public Key in JWK format:")
Debug.WriteLine(json.Emit())

' Sample output:
' { 
'   "kty": "RSA",
'   "n": "33TqqLR3eeUmDtHS89qF3p4MP7Wfqt2Zjj3lZjLjjCGDvwr9cJNlNDiuKboODgUiT4ZdPWbOiMAfDcDzlOxA04DDnEFGAf-kDQiNSe2ZtqC7bnIc8-KSG_qOGQIVaay4Ucr6ovDkykO5Hxn7OU7sJp9TP9H0JH8zMQA6YzijYH9LsupTerrY3U6zyihVEDXXOv08vBHk50BMFJbE9iwFwnxCsU5-UZUZYw87Uu0n4LPFS9BT8tUIvAfnRXIEWCha3KbFWmdZQZlyrFw0buUEf0YN3_Q0auBkdbDR_ES2PbgKTJdkjc_rEeM0TxvOUf7HuUNOhrtAVEN1D5uuxE1WSw",
'   "e": "AQAB"
' }

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

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

' { 
'   "kty": "RSA",
'   "n": "33TqqLR3eeUmDtHS89qF3p4MP7Wfqt2Zjj3lZjLjjCGDvwr9cJNlNDiuKboODgUiT4ZdPWbOiMAfDcDzlOxA04DDnEFGAf-kDQiNSe2ZtqC7bnIc8-KSG_qOGQIVaay4Ucr6ovDkykO5Hxn7OU7sJp9TP9H0JH8zMQA6YzijYH9LsupTerrY3U6zyihVEDXXOv08vBHk50BMFJbE9iwFwnxCsU5-UZUZYw87Uu0n4LPFS9BT8tUIvAfnRXIEWCha3KbFWmdZQZlyrFw0buUEf0YN3_Q0auBkdbDR_ES2PbgKTJdkjc_rEeM0TxvOUf7HuUNOhrtAVEN1D5uuxE1WSw",
'   "e": "AQAB",
'   "use": "enc",
'   "kid": "123ABC"
' }