(C++) JWS Using HMAC SHA-256

Creates a JSON Web Signatures (JWS) using HMAC SHA-256.

Note: This example requires Chilkat v9.5.0.66 or greater.

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#include <CkJsonObject.h>
#include <CkJws.h>

void ChilkatSample(void)
    {
    // This requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

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

    bool success;

    // First create the JWS Protected Header
    CkJsonObject jwsProtHdr;
    jwsProtHdr.AppendString("typ","JWT");
    jwsProtHdr.AppendString("alg","HS256");
    std::cout << "JWS Protected Header: " << jwsProtHdr.emit() << "\r\n";

    // Output:
    // JWS Protected Header: {"typ":"JWT","alg":"HS256"}

    CkJws jws;

    // Set the HMAC key:
    const char *hmacKey = "AyM1SysPpbyDfgZld3umj1qzKObwVMkoqQ-EstJQLr_T-1qS0gZH75aKtMN3Yj0iPS4hcgUuTwjAzZr1Z9CAow";
    int signatureIndex = 0;
    jws.SetMacKey(signatureIndex,hmacKey,"base64url");

    // Set the protected header:
    jws.SetProtectedHeader(signatureIndex,jwsProtHdr);

    // Set the payload.
    bool bIncludeBom = false;
    const char *payloadStr = "In our village, folks say God crumbles up the old moon into stars.";
    jws.SetPayload(payloadStr,"utf-8",bIncludeBom);

    // Create the JWS
    // By default, the compact serialization is used.
    const char *jwsCompact = jws.createJws();
    if (jws.get_LastMethodSuccess() != true) {
        std::cout << jws.lastErrorText() << "\r\n";
        return;
    }

    std::cout << "JWS: " << jwsCompact << "\r\n";

    // sample output:
    // JWS: eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.SW4gb3VyIHZpbGxhZ2UsIGZvbGtzIHNheSBHb2QgY3J1bWJsZXMgdXAgdGhlIG9sZCBtb29uIGludG8gc3RhcnMu.bsYsi8HJ0N6OqGI1hKQ9QQRNPxxA5qMpcHLtOvXatk8

    // Now load the JWS, validate, and recover the original text.
    CkJws jws2;

    // Load the JWS.
    success = jws2.LoadJws(jwsCompact);

    // Set the MAC key used for validation.
    signatureIndex = 0;
    jws2.SetMacKey(signatureIndex,hmacKey,"base64url");

    // Validate the 1st (and only) signature at index 0..
    int v = jws2.Validate(signatureIndex);
    if (v < 0) {
        // Perhaps Chilkat was not unlocked or the trial expired..
        std::cout << "Method call failed for some other reason." << "\r\n";
        std::cout << jws2.lastErrorText() << "\r\n";
        return;
    }

    if (v == 0) {
        std::cout << "Invalid signature.  The MAC key was incorrect, the JWS was invalid, or both." << "\r\n";
        return;
    }

    // If we get here, the signature was validated..
    std::cout << "Signature validated." << "\r\n";

    // Recover the original content:
    std::cout << jws2.getPayload("utf-8") << "\r\n";

    // Examine the protected header:
    CkJsonObject *joseHeader = jws2.GetProtectedHeader(signatureIndex);
    if (jws2.get_LastMethodSuccess() != true) {
        std::cout << "No protected header found at the given index." << "\r\n";
        return;
    }

    joseHeader->put_EmitCompact(false);

    std::cout << "Protected (JOSE) header:" << "\r\n";
    std::cout << joseHeader->emit() << "\r\n";
    delete joseHeader;

    // Output:

    // 	Signature validated.
    // 	In our village, folks say God crumbles up the old moon into stars.
    // 	Protected (JOSE) header:
    // 	{ 
    // 	  "typ": "JWT",
    // 	  "alg": "HS256"
    // 	} 
    }