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(Visual FoxPro) Load ECC Public Key from JWK Format (JSON Web Key)

Demonstrates how to load an ECC public 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 loPubKey
LOCAL lnBPreferPkcs1

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

*  First build a JWK sample to load..
loJson = CreateObject('Chilkat_9_5_0.JsonObject')
loJson.UpdateString("kty","EC")
loJson.UpdateString("crv","P-256")
loJson.UpdateString("x","oBUyo8CQAFPeYPvv78ylh5MwFZjTCLQeb042TjiMJxE")
loJson.UpdateString("y","vvQyxZkUjJQUPU_0bCy3Pj5qQdfu8jwEfqEeYGZ95CU")

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

*  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()

loPubKey = CreateObject('Chilkat_9_5_0.PublicKey')
*  The LoadFromString method will automatically detect the format.
lnSuccess = loPubKey.LoadFromString(lcJwkStr)
IF (lnSuccess <> 1) THEN
    ? loPubKey.LastErrorText
    RELEASE loJson
    RELEASE loPubKey
    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..
? loPubKey.GetXml()

*  XML output:
*  <ECCPublicKey curve="secp256r1"
*     x="A01532A3C0900053DE60FBEFEFCCA58793301598D308B41E6F4E364E388C2711"
*     y="BEF432C599148C94143D4FF46C2CB73E3E6A41D7EEF23C047EA11E60667DE425">
*     MIIBSzCCAQMGByqGSM49AgEwgfcCAQEwLAYHKoZIzj0BAQIhAP////8AAAABAAAAAAAAAAAAAAAA////////////////MFsEIP////8AAAABAAAAAAAAAAAAAAAA///////////////8BCBaxjXYqjqT57PrvVV2mIa8ZR0GsMxTsPY7zjw+J9JgSwMVAMSdNgiG5wSTamZ44ROdJreBn36QBEEEaxfR8uEsQkf4vOblY6RA8ncDfYEt6zOg9KE5RdiYwpZP40Li/hp/m47n60p8D54WK84zV2sxXs7LtkBoN79R9QIhAP////8AAAAA//////////+85vqtpxeehPO5ysL8YyVRAgEBA0IABKAVMqPAkABT3mD77+/MpYeTMBWY0wi0Hm9ONk44jCcRvvQyxZkUjJQUPU/0bCy3Pj5qQdfu8jwEfqEeYGZ95CU=
*  </ECCPublicKey>

*  Choose PCKS1 or PCKS8 PEM format..
lnBPreferPkcs1 = 0
? loPubKey.GetPem(lnBPreferPkcs1)

*  PEM output
*  -----BEGIN PUBLIC KEY-----
*  MIIBSzCCAQMGByqGSM49AgEwgfcCAQEwLAYHKoZIzj0BAQIhAP////8AAAABAAAA
*  AAAAAAAAAAAA////////////////MFsEIP////8AAAABAAAAAAAAAAAAAAAA////
*  ///////////8BCBaxjXYqjqT57PrvVV2mIa8ZR0GsMxTsPY7zjw+J9JgSwMVAMSd
*  NgiG5wSTamZ44ROdJreBn36QBEEEaxfR8uEsQkf4vOblY6RA8ncDfYEt6zOg9KE5
*  RdiYwpZP40Li/hp/m47n60p8D54WK84zV2sxXs7LtkBoN79R9QIhAP////8AAAAA
*  //////////+85vqtpxeehPO5ysL8YyVRAgEBA0IABKAVMqPAkABT3mD77+/MpYeT
*  MBWY0wi0Hm9ONk44jCcRvvQyxZkUjJQUPU/0bCy3Pj5qQdfu8jwEfqEeYGZ95CU=
*  -----END PUBLIC KEY-----

RELEASE loJson
RELEASE loPubKey


 

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