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(DataFlex) 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

Use ChilkatAx-9.5.0-win32.pkg

Procedure Test
    Boolean iSuccess
    Handle hoJson
    String sJwkStr
    Handle hoPubKey
    Boolean iBPreferPkcs1
    String sTemp1

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

    //  First build a JWK sample to load..
    Get Create (RefClass(cComChilkatJsonObject)) To hoJson
    If (Not(IsComObjectCreated(hoJson))) Begin
        Send CreateComObject of hoJson
    End
    Get ComUpdateString Of hoJson "kty" "EC" To iSuccess
    Get ComUpdateString Of hoJson "crv" "P-256" To iSuccess
    Get ComUpdateString Of hoJson "x" "oBUyo8CQAFPeYPvv78ylh5MwFZjTCLQeb042TjiMJxE" To iSuccess
    Get ComUpdateString Of hoJson "y" "vvQyxZkUjJQUPU_0bCy3Pj5qQdfu8jwEfqEeYGZ95CU" To iSuccess

    //  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.
    Set ComEmitCompact Of hoJson To False

    //  Show the JWK string to be loaded:
    Get ComEmit Of hoJson To sJwkStr

    Get Create (RefClass(cComChilkatPublicKey)) To hoPubKey
    If (Not(IsComObjectCreated(hoPubKey))) Begin
        Send CreateComObject of hoPubKey
    End
    //  The LoadFromString method will automatically detect the format.
    Get ComLoadFromString Of hoPubKey sJwkStr To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoPubKey To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    //  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..
    Get ComGetXml Of hoPubKey To sTemp1
    Showln sTemp1

    //  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..
    Move False To iBPreferPkcs1
    Get ComGetPem Of hoPubKey iBPreferPkcs1 To sTemp1
    Showln sTemp1

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


End_Procedure

 

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