(C++) 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.

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

void ChilkatSample(void)
    {
    // Note: This example requires Chilkat v9.5.0.66 or later.

    // Load a PEM file into memory.
    CkStringBuilder sbPem;
    bool success = sbPem.LoadFile("qa_data/pem/ecc_privKey.pem","utf-8");
    if (success != true) {
        std::cout << "Failed to load PEM file." << "\r\n";
        return;
    }

    // Load the PEM into a private key object.
    CkPrivateKey privKey;
    success = privKey.LoadPem(sbPem.getAsString());
    if (success != true) {
        std::cout << privKey.lastErrorText() << "\r\n";
        return;
    }

    // Get the private key in JWK format:
    const char *jwk = privKey.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:

    CkJsonObject json;
    json.Load(jwk);
    json.put_EmitCompact(false);
    std::cout << "ECC Private Key in JWK format:" << "\r\n";
    std::cout << json.emit() << "\r\n";

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

    // Additional information can be added like this:
    json.AppendString("use","enc");
    json.AppendString("kid","123ABC");

    // Now examine the JSON:
    std::cout << json.emit() << "\r\n";

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