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(Unicode C) JWS Using HMAC SHA-256Creates a JSON Web Signatures (JWS) using HMAC SHA-256. Note: This example requires Chilkat v9.5.0.66 or greater.
#include <C_CkJsonObjectW.h> #include <C_CkJwsW.h> void ChilkatSample(void) { BOOL success; HCkJsonObjectW jwsProtHdr; HCkJwsW jws; const wchar_t *hmacKey; int signatureIndex; BOOL bIncludeBom; const wchar_t *payloadStr; const wchar_t *jwsCompact; HCkJwsW jws2; int v; HCkJsonObjectW joseHeader; // 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. // First create the JWS Protected Header jwsProtHdr = CkJsonObjectW_Create(); CkJsonObjectW_AppendString(jwsProtHdr,L"typ",L"JWT"); CkJsonObjectW_AppendString(jwsProtHdr,L"alg",L"HS256"); wprintf(L"JWS Protected Header: %s\n",CkJsonObjectW_emit(jwsProtHdr)); // Output: // JWS Protected Header: {"typ":"JWT","alg":"HS256"} jws = CkJwsW_Create(); // Set the HMAC key: hmacKey = L"AyM1SysPpbyDfgZld3umj1qzKObwVMkoqQ-EstJQLr_T-1qS0gZH75aKtMN3Yj0iPS4hcgUuTwjAzZr1Z9CAow"; signatureIndex = 0; CkJwsW_SetMacKey(jws,signatureIndex,hmacKey,L"base64url"); // Set the protected header: CkJwsW_SetProtectedHeader(jws,signatureIndex,jwsProtHdr); // Set the payload. bIncludeBom = FALSE; payloadStr = L"In our village, folks say God crumbles up the old moon into stars."; CkJwsW_SetPayload(jws,payloadStr,L"utf-8",bIncludeBom); // Create the JWS // By default, the compact serialization is used. jwsCompact = CkJwsW_createJws(jws); if (CkJwsW_getLastMethodSuccess(jws) != TRUE) { wprintf(L"%s\n",CkJwsW_lastErrorText(jws)); CkJsonObjectW_Dispose(jwsProtHdr); CkJwsW_Dispose(jws); return; } wprintf(L"JWS: %s\n",jwsCompact); // sample output: // JWS: eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.SW4gb3VyIHZpbGxhZ2UsIGZvbGtzIHNheSBHb2QgY3J1bWJsZXMgdXAgdGhlIG9sZCBtb29uIGludG8gc3RhcnMu.bsYsi8HJ0N6OqGI1hKQ9QQRNPxxA5qMpcHLtOvXatk8 // Now load the JWS, validate, and recover the original text. jws2 = CkJwsW_Create(); // Load the JWS. success = CkJwsW_LoadJws(jws2,jwsCompact); // Set the MAC key used for validation. signatureIndex = 0; CkJwsW_SetMacKey(jws2,signatureIndex,hmacKey,L"base64url"); // Validate the 1st (and only) signature at index 0.. v = CkJwsW_Validate(jws2,signatureIndex); if (v < 0) { // Perhaps Chilkat was not unlocked or the trial expired.. wprintf(L"Method call failed for some other reason.\n"); wprintf(L"%s\n",CkJwsW_lastErrorText(jws2)); CkJsonObjectW_Dispose(jwsProtHdr); CkJwsW_Dispose(jws); CkJwsW_Dispose(jws2); return; } if (v == 0) { wprintf(L"Invalid signature. The MAC key was incorrect, the JWS was invalid, or both.\n"); CkJsonObjectW_Dispose(jwsProtHdr); CkJwsW_Dispose(jws); CkJwsW_Dispose(jws2); return; } // If we get here, the signature was validated.. wprintf(L"Signature validated.\n"); // Recover the original content: wprintf(L"%s\n",CkJwsW_getPayload(jws2,L"utf-8")); // Examine the protected header: joseHeader = CkJwsW_GetProtectedHeader(jws2,signatureIndex); if (CkJwsW_getLastMethodSuccess(jws2) != TRUE) { wprintf(L"No protected header found at the given index.\n"); CkJsonObjectW_Dispose(jwsProtHdr); CkJwsW_Dispose(jws); CkJwsW_Dispose(jws2); return; } CkJsonObjectW_putEmitCompact(joseHeader,FALSE); wprintf(L"Protected (JOSE) header:\n"); wprintf(L"%s\n",CkJsonObjectW_emit(joseHeader)); CkJsonObjectW_Dispose(joseHeader); // Output: // Signature validated. // In our village, folks say God crumbles up the old moon into stars. // Protected (JOSE) header: // { // "typ": "JWT", // "alg": "HS256" // } CkJsonObjectW_Dispose(jwsProtHdr); CkJwsW_Dispose(jws); CkJwsW_Dispose(jws2); } |
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