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(Unicode C) Create JWT Using HS256, HS384, or HS512Demonstrates how to create a JWT using HS256, HS384, or HS512. (HS256 is JWT's acronym for HMAC-SHA256.) When HMAC is used, the secret is a shared secret (i.e. password) that both client and server know beforehand. This example also demonstrates how to include time constraints:
#include <C_CkJwtW.h> #include <C_CkJsonObjectW.h> void ChilkatSample(void) { HCkJwtW jwt; HCkJsonObjectW jose; BOOL success; HCkJsonObjectW claims; int curDateTime; const wchar_t *strJwt; // Demonstrates how to create an HMAC JWT using a shared secret (password). // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. jwt = CkJwtW_Create(); // Build the JOSE header jose = CkJsonObjectW_Create(); // Use HS256. Pass the string "HS384" or "HS512" to use a different algorithm. success = CkJsonObjectW_AppendString(jose,L"alg",L"HS256"); success = CkJsonObjectW_AppendString(jose,L"typ",L"JWT"); // Now build the JWT claims (also known as the payload) claims = CkJsonObjectW_Create(); success = CkJsonObjectW_AppendString(claims,L"iss",L"http://example.org"); success = CkJsonObjectW_AppendString(claims,L"sub",L"John"); success = CkJsonObjectW_AppendString(claims,L"aud",L"http://example.com"); // Set the timestamp of when the JWT was created to now. curDateTime = CkJwtW_GenNumericDate(jwt,0); success = CkJsonObjectW_AddIntAt(claims,-1,L"iat",curDateTime); // Set the "not process before" timestamp to now. success = CkJsonObjectW_AddIntAt(claims,-1,L"nbf",curDateTime); // Set the timestamp defining an expiration time (end time) for the token // to be now + 1 hour (3600 seconds) success = CkJsonObjectW_AddIntAt(claims,-1,L"exp",curDateTime + 3600); // Produce the smallest possible JWT: CkJwtW_putAutoCompact(jwt,TRUE); strJwt = CkJwtW_createJwt(jwt,CkJsonObjectW_emit(jose),CkJsonObjectW_emit(claims),L"secret"); wprintf(L"%s\n",strJwt); CkJwtW_Dispose(jwt); CkJsonObjectW_Dispose(jose); CkJsonObjectW_Dispose(claims); } |
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