(VB.NET) Create JWK Set Containing Certificates

Demonstrates how to create a JWK Set containing N certificates.

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' This example creates the following JWK Set from two certificates:

' {
'   "keys": [
'     {
'       "kty": "RSA",
'       "use": "sig",
'       "kid": "BB8CeFVqyaGrGNuehJIiL4dfjzw",
'       "x5t": "BB8CeFVqyaGrGNuehJIiL4dfjzw",
'       "n": "nYf1jpn7cFdQ...9Iw",
'       "e": "AQAB",
'       "x5c": [
'         "MIIDBTCCAe2...Z+NTZo"
'       ]
'     },
'     {
'       "kty": "RSA",
'       "use": "sig",
'       "kid": "M6pX7RHoraLsprfJeRCjSxuURhc",
'       "x5t": "M6pX7RHoraLsprfJeRCjSxuURhc",
'       "n": "xHScZMPo8F...EO4QQ",
'       "e": "AQAB",
'       "x5c": [
'         "MIIC8TCCAdmgA...Vt5432GA=="
'       ]
'     }
'   ]
' }

' First get two certificates from files.
Dim cert1 As New Chilkat.Cert
Dim success As Boolean = cert1.LoadFromFile("qa_data/certs/brasil_cert.pem")
If (success <> True) Then
    Debug.WriteLine(cert1.LastErrorText)
    Exit Sub
End If


Dim cert2 As New Chilkat.Cert
success = cert2.LoadFromFile("qa_data/certs/testCert.cer")
If (success <> True) Then
    Debug.WriteLine(cert2.LastErrorText)
    Exit Sub
End If


' We'll need this crypt object re-encode the SHA1 thumbprint from hex to base64.
Dim crypt As New Chilkat.Crypt2

Dim json As New Chilkat.JsonObject

' Let's begin with the 1st cert:
json.I = 0
json.UpdateString("keys[i].kty","RSA")
json.UpdateString("keys[i].use","sig")

Dim hexThumbprint As String = cert1.Sha1Thumbprint
Dim base64Thumbprint As String = crypt.ReEncode(hexThumbprint,"hex","base64")
json.UpdateString("keys[i].kid",base64Thumbprint)
json.UpdateString("keys[i].x5t",base64Thumbprint)

' (We're assuming these are RSA certificates)
' To get the modulus (n) and exponent (e), we need to get the cert's public key and then get its JWK.
Dim pubKey As Chilkat.PublicKey = cert1.ExportPublicKey()
Dim pubKeyJwk As New Chilkat.JsonObject
pubKeyJwk.Load(pubKey.GetJwk())

json.UpdateString("keys[i].n",pubKeyJwk.StringOf("n"))
json.UpdateString("keys[i].e",pubKeyJwk.StringOf("e"))

' Now add the entire X.509 certificate 
json.UpdateString("keys[i].x5c[0]",cert1.GetEncoded())


' Now do the same for cert2..
json.I = 1

json.UpdateString("keys[i].kty","RSA")
json.UpdateString("keys[i].use","sig")

hexThumbprint = cert2.Sha1Thumbprint
base64Thumbprint = crypt.ReEncode(hexThumbprint,"hex","base64")
json.UpdateString("keys[i].kid",base64Thumbprint)
json.UpdateString("keys[i].x5t",base64Thumbprint)

pubKey = cert2.ExportPublicKey()
pubKeyJwk.Load(pubKey.GetJwk())

json.UpdateString("keys[i].n",pubKeyJwk.StringOf("n"))
json.UpdateString("keys[i].e",pubKeyJwk.StringOf("e"))

' Now add the entire X.509 certificate 
json.UpdateString("keys[i].x5c[0]",cert2.GetEncoded())


' Emit the JSON..
json.EmitCompact = False
Debug.WriteLine(json.Emit())