(Visual FoxPro) 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.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

LOCAL lnSuccess
LOCAL loJson
LOCAL lcJwkStr
LOCAL loPrivKey

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

* First build a JWK sample to load..
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.JsonObject')
loJson = CreateObject('Chilkat.JsonObject')
loJson.UpdateString("kty","EC")
loJson.UpdateString("crv","P-256")
loJson.UpdateString("x","oBUyo8CQAFPeYPvv78ylh5MwFZjTCLQeb042TjiMJxE")
loJson.UpdateString("y","vvQyxZkUjJQUPU_0bCy3Pj5qQdfu8jwEfqEeYGZ95CU")
loJson.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.
loJson.EmitCompact = 0

* Show the JWK string to be loaded:
lcJwkStr = loJson.Emit()

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.PrivateKey')
loPrivKey = CreateObject('Chilkat.PrivateKey')
lnSuccess = loPrivKey.LoadJwk(lcJwkStr)
IF (lnSuccess <> 1) THEN
    ? loPrivKey.LastErrorText
    RELEASE loJson
    RELEASE loPrivKey
    CANCEL
ENDIF

* 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..
? loPrivKey.GetXml()

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

? loPrivKey.GetPkcs8EncryptedPem("secret")

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

RELEASE loJson
RELEASE loPrivKey