(VB.NET) Load ECC Private Key from JWK Format (JSON Web Key)

Demonstrates how to load an ECC private key from JWK (JSON Web Key) format.

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

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' Note: This example requires Chilkat v9.5.0.66 or later.
Dim success As Boolean

' First build a JWK sample to load..
Dim json As New Chilkat.JsonObject
json.UpdateString("kty","EC")
json.UpdateString("crv","P-256")
json.UpdateString("x","oBUyo8CQAFPeYPvv78ylh5MwFZjTCLQeb042TjiMJxE")
json.UpdateString("y","vvQyxZkUjJQUPU_0bCy3Pj5qQdfu8jwEfqEeYGZ95CU")
json.UpdateString("d","EbVzfPnZPxfAyxqEZV05laAoJAl-_6Xt2O4mOB611sM")

' The JSON contains the following:
' { 
'   "kty": "EC",
'   "crv": "P-256",
'   "x": "oBUyo8CQAFPeYPvv78ylh5MwFZjTCLQeb042TjiMJxE",
'   "y": "vvQyxZkUjJQUPU_0bCy3Pj5qQdfu8jwEfqEeYGZ95CU",
'   "d": "EbVzfPnZPxfAyxqEZV05laAoJAl-_6Xt2O4mOB611sM"
' }

' Note: The JSON can contain other members, such as "use", "kid", or anything else.  These will be ignored.
json.EmitCompact = False

' Show the JWK string to be loaded:
Dim jwkStr As String = json.Emit()

Dim privKey As New Chilkat.PrivateKey
success = privKey.LoadJwk(jwkStr)
If (success <> True) Then
    Debug.WriteLine(privKey.LastErrorText)
    Exit Sub
End If


' OK.. the JWK is loaded.  It can be used in whatever way desired...

' The key can be retrieved in any other format, such as XML or PEM..
Debug.WriteLine(privKey.GetXml())

' XML output:
' <ECCKeyValue curve="secp256r1">MHcCAQEEIBG1c3z52T8XwMsahGVdOZWgKCQJfv+l7djuJjgetdbDoAoGCCqGSM49AwEHoEQDQgAEoBUyo8CQAFPeYPvv78ylh5MwFZjTCLQeb042TjiMJxG+9DLFmRSMlBQ9T/RsLLc+PmpB1+7yPAR+oR5gZn3kJQ==</ECCKeyValue>


Debug.WriteLine(privKey.GetPkcs8EncryptedPem("secret"))

' PEM output
' 
' -----BEGIN ENCRYPTED PRIVATE KEY-----
' MIHFMEAGCSqGSIb3DQEFDTAzMBsGCSqGSIb3DQEFDDAOBAiku9rUjavLQQICCAAw
' FAYIKoZIhvcNAwcECGsl/5nLai+JBIGAVIqKAdfcRQNLl1t3x+n8OZ92d1H+qgjS
' Hs83wn2joJK4nlqy+rzosZxQ3e8NTJQyUEWZWcjqMj/N0phS3QWtcD/qbda5oEcv
' QgtU60cZ4ql3truefAmlZz2PdpOfqtYhxlvjJQxnyojn4ntj69OwLOt9SZbaBQQi
' KUL8KXT4Pq8=
' -----END ENCRYPTED PRIVATE KEY-----