(PureBasic) 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.

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IncludeFile "CkPrivateKey.pb"
IncludeFile "CkJsonObject.pb"

Procedure ChilkatExample()

    ; Note: This example requires Chilkat v9.5.0.66 or later.
    success.i

    ; First build a JWK sample to load..
    json.i = CkJsonObject::ckCreate()
    If json.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkJsonObject::ckUpdateString(json,"kty","EC")
    CkJsonObject::ckUpdateString(json,"crv","P-256")
    CkJsonObject::ckUpdateString(json,"x","oBUyo8CQAFPeYPvv78ylh5MwFZjTCLQeb042TjiMJxE")
    CkJsonObject::ckUpdateString(json,"y","vvQyxZkUjJQUPU_0bCy3Pj5qQdfu8jwEfqEeYGZ95CU")
    CkJsonObject::ckUpdateString(json,"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.
    CkJsonObject::setCkEmitCompact(json, 0)

    ; Show the JWK string to be loaded:
    jwkStr.s = CkJsonObject::ckEmit(json)

    privKey.i = CkPrivateKey::ckCreate()
    If privKey.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    success = CkPrivateKey::ckLoadJwk(privKey,jwkStr)
    If success <> 1
        Debug CkPrivateKey::ckLastErrorText(privKey)
        CkJsonObject::ckDispose(json)
        CkPrivateKey::ckDispose(privKey)
        ProcedureReturn
    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..
    Debug CkPrivateKey::ckGetXml(privKey)

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

    Debug CkPrivateKey::ckGetPkcs8EncryptedPem(privKey,"secret")

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


    CkJsonObject::ckDispose(json)
    CkPrivateKey::ckDispose(privKey)


    ProcedureReturn
EndProcedure