Xojo Plugin

Create JWK Set Containing Certificates

See more Certificates Examples

Demonstrates how to create a JWK Set containing N certificates. Xojo Plugin

Dim success As Boolean
success = False

// 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
success = cert1.LoadFromFile("qa_data/certs/brasil_cert.pem")
If (success = False) Then
    System.DebugLog(cert1.LastErrorText)
    Return
End If

Dim cert2 As New Chilkat.Cert
success = cert2.LoadFromFile("qa_data/certs/testCert.cer")
If (success = False) Then
    System.DebugLog(cert2.LastErrorText)
    Return
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
success = json.UpdateString("keys[i].kty","RSA")
success = json.UpdateString("keys[i].use","sig")

Dim hexThumbprint As String
hexThumbprint = cert1.Sha1Thumbprint
Dim base64Thumbprint As String
base64Thumbprint = crypt.ReEncode(hexThumbprint,"hex","base64")
success = json.UpdateString("keys[i].kid",base64Thumbprint)
success = 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 New Chilkat.PublicKey
success = cert1.GetPublicKey(pubKey)

Dim pubKeyJwk As New Chilkat.JsonObject
success = pubKeyJwk.Load(pubKey.GetJwk())
success = json.UpdateString("keys[i].n",pubKeyJwk.StringOf("n"))
success = json.UpdateString("keys[i].e",pubKeyJwk.StringOf("e"))

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

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

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

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

success = pubKeyJwk.Load(pubKey.GetJwk())
success = json.UpdateString("keys[i].n",pubKeyJwk.StringOf("n"))
success = json.UpdateString("keys[i].e",pubKeyJwk.StringOf("e"))

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

// Emit the JSON..
json.EmitCompact = False
System.DebugLog(json.Emit())