B4X

Load ECC Private Key from JWK Format (JSON Web Key)

See more ECC Examples

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.

B4X

Dim success As Boolean = False

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

'  First build a JWK sample to load..
Dim json As ChilkatJsonObject
json.Initialize
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 ChilkatPrivateKey
privKey.Initialize("privKey")
success = privKey.LoadJwk(jwkStr)
If success <> True Then
    Log(privKey.LastErrorText)
    Return
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..
Log(privKey.GetXml)

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

Log(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-----