C++

Load ECC Private Key from JWK Format (JSON Web Key)

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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.

C++

#include <CkJsonObject.h>
#include <CkPrivateKey.h>

void ChilkatSample(void)
    {
    bool success = false;

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

    //  First build a JWK sample to load..
    CkJsonObject json;
    json.UpdateString("kty","EC");
    json.UpdateString("crv","P-256");
    json.UpdateString("x","oBUyo8CQAFPeYPvv78ylh5MwFZjTCLQeb042TjiMJxE");
    json.UpdateString("y","vvQyxZkUjJQUPU_0bCy3Pj5qQdfu8jwEfqEeYGZ95CU");
    json.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.
    json.put_EmitCompact(false);

    //  Show the JWK string to be loaded:
    const char *jwkStr = json.emit();

    CkPrivateKey privKey;
    success = privKey.LoadJwk(jwkStr);
    if (success != true) {
        std::cout << privKey.lastErrorText() << "\r\n";
        return;
    }

    //  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..
    std::cout << privKey.getXml() << "\r\n";

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

    std::cout << privKey.getPkcs8EncryptedPem("secret") << "\r\n";

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