(Visual FoxPro) Get ECC Private Key in JWK Format (JSON Web Key)

Demonstrates how to get an ECC private key in 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 loSbPem
LOCAL lnSuccess
LOCAL loPrivKey
LOCAL lcJwk
LOCAL loJson

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

* Load a PEM file into memory.
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.StringBuilder')
loSbPem = CreateObject('Chilkat.StringBuilder')
lnSuccess = loSbPem.LoadFile("qa_data/pem/ecc_privKey.pem","utf-8")
IF (lnSuccess <> 1) THEN
    ? "Failed to load PEM file."
    RELEASE loSbPem
    CANCEL
ENDIF

* Load the PEM into a private key object.
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.PrivateKey')
loPrivKey = CreateObject('Chilkat.PrivateKey')
lnSuccess = loPrivKey.LoadPem(loSbPem.GetAsString())
IF (lnSuccess <> 1) THEN
    ? loPrivKey.LastErrorText
    RELEASE loSbPem
    RELEASE loPrivKey
    CANCEL
ENDIF

* Get the private key in JWK format:
lcJwk = loPrivKey.GetJwk()

* The GetJwk method will return the JWK in the most compact JSON format possible,
* as a single line with no extra whitespace.  To get a more human-readable JWK (for this example),
* load into a Chilkat JSON object and emit non-compact:

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.JsonObject')
loJson = CreateObject('Chilkat.JsonObject')
loJson.Load(lcJwk)
loJson.EmitCompact = 0
? "ECC Private Key in JWK format:"
? loJson.Emit()

* Sample output:
* { 
*   "kty": "EC",
*   "crv": "P-256",
*   "x": "oBUyo8CQAFPeYPvv78ylh5MwFZjTCLQeb042TjiMJxE",
*   "y": "vvQyxZkUjJQUPU_0bCy3Pj5qQdfu8jwEfqEeYGZ95CU",
*   "d": "EbVzfPnZPxfAyxqEZV05laAoJAl-_6Xt2O4mOB611sM"
* }
* 

* Additional information can be added like this:
loJson.AppendString("use","enc")
loJson.AppendString("kid","123ABC")

* Now examine the JSON:
? loJson.Emit()

* { 
*   "kty": "EC",
*   "crv": "P-256",
*   "x": "oBUyo8CQAFPeYPvv78ylh5MwFZjTCLQeb042TjiMJxE",
*   "y": "vvQyxZkUjJQUPU_0bCy3Pj5qQdfu8jwEfqEeYGZ95CU",
*   "d": "EbVzfPnZPxfAyxqEZV05laAoJAl-_6Xt2O4mOB611sM",
*   "use": "enc",
*   "kid": "123ABC"
* }

RELEASE loSbPem
RELEASE loPrivKey
RELEASE loJson