(C) Create JWT using a Certificate's Private Key

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Demonstrates how to create a JWT using a certificate's private key.

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#include <C_CkCert.h>
#include <C_CkJwt.h>
#include <C_CkJsonObject.h>

void ChilkatSample(void)
    {
    HCkCert cert;
    BOOL success;
    HCkJwt jwt;
    HCkJsonObject jose;
    HCkJsonObject claims;
    int curDateTime;
    const char *token;

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // Demonstrates how to create a JWT using an certificate's private key.

    cert = CkCert_Create();

    // Load an ECC private key from a PEM file.
    success = CkCert_LoadPfxFile(cert,"c:/temp/myPfx.pfx","pfxPassword");
    if (success != TRUE) {
        printf("%s\n",CkCert_lastErrorText(cert));
        CkCert_Dispose(cert);
        return;
    }

    jwt = CkJwt_Create();

    // Build the JOSE header
    jose = CkJsonObject_Create();
    // Note: The IsEcdsa function was added in Chilkat v10.1.0
    if (CkCert_IsEcdsa(cert) == TRUE) {
        // Use ES256.  Pass the string "ES384" or "ES512" to use ECC with SHA-384 or SHA-512.
        CkJsonObject_AppendString(jose,"alg","ES256");
    }
    else {
        // Probably RSA...
        // Use RS256.  Pass the string "RS384" or "RS512" to use RSA with SHA-384 or SHA-512.
        CkJsonObject_AppendString(jose,"alg","RS256");
    }

    CkJsonObject_AppendString(jose,"typ","JWT");

    // Now build the JWT claims (also known as the payload)
    claims = CkJsonObject_Create();
    CkJsonObject_AppendString(claims,"iss","http://example.org");
    CkJsonObject_AppendString(claims,"sub","John");
    CkJsonObject_AppendString(claims,"aud","http://example.com");

    // Set the timestamp of when the JWT was created to now.
    curDateTime = CkJwt_GenNumericDate(jwt,0);
    CkJsonObject_AddIntAt(claims,-1,"iat",curDateTime);

    // Set the "not process before" timestamp to now.
    CkJsonObject_AddIntAt(claims,-1,"nbf",curDateTime);

    // Set the timestamp defining an expiration time (end time) for the token
    // to be now + 1 hour (3600 seconds)
    CkJsonObject_AddIntAt(claims,-1,"exp",curDateTime + 3600);

    // Produce the smallest possible JWT:
    CkJwt_putAutoCompact(jwt,TRUE);

    // Create the JWT token.
    token = CkJwt_createJwtCert(jwt,CkJsonObject_emit(jose),CkJsonObject_emit(claims),cert);

    printf("%s\n",token);

    // Example output:
    // eyJhbGciOiJFUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJodHRwOi8vZXhhbXBsZS5vcmciLCJzdWIiOiJKb2huIiwiYXVkIjoiaHR0cDovL2V4YW1wbGUuY29tIiwiaWF0IjoxNDg1NzA4NzkyLCJuYmYiOjE0ODU3MDg3OTIsImV4cCI6MTQ4NTcxMjM5Mn0.wqsuyJpxJ073ox-lOiLFqG1lQocXe4hGf2XGZJRrO3qn0UusxI_bu3Gzky8gBsH4sA4u9TWZn5M-1wYMMIJk6Q


    CkCert_Dispose(cert);
    CkJwt_Dispose(jwt);
    CkJsonObject_Dispose(jose);
    CkJsonObject_Dispose(claims);

    }