Visual FoxPro

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.

Visual FoxPro

LOCAL lnSuccess
LOCAL loJson
LOCAL lcJwkStr
LOCAL loPrivKey

lnSuccess = 0

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

* First build a JWK sample to load..
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()

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