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(Unicode C) Verify JWT with EdDSA / Ed25519 SignatureNote: This example requires Chilkat v9.5.0.84 or greater. Demonstrates how to verify a JWT that was signed using an Ed25519 private key. This example verifies the EdDSA signature. It also does the following:
#include <C_CkPublicKeyW.h> #include <C_CkJwtW.h> void ChilkatSample(void) { const wchar_t *jsonPubKey; HCkPublicKeyW pubKey; BOOL success; HCkJwtW jwt; const wchar_t *token; BOOL sigVerified; int leeway; BOOL bTimeValid; const wchar_t *payload; const wchar_t *joseHeader; // Demonstrates how to verify a JWT with an EdDSA/Ed25519 Signature // *** Requires Chilkat v9.5.0.84 or greater. // This example assumes the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. // Use this Ed25519 public key for verification jsonPubKey = L"{\"kty\": \"OKP\",\"alg\": \"EdDSA\",\"crv\": \"Ed25519\",\"x\": \"11qYAYKxCrfVS_7TyWQHOg7hcvPapiMlrwIaaPcHURo\"}"; pubKey = CkPublicKeyW_Create(); success = CkPublicKeyW_LoadFromString(pubKey,jsonPubKey); if (success == FALSE) { wprintf(L"%s\n",CkPublicKeyW_lastErrorText(pubKey)); CkPublicKeyW_Dispose(pubKey); return; } jwt = CkJwtW_Create(); token = L"eyJhbGciOiJFZERTQSJ9.RXhhbXBsZSBvZiBFZDI1NTE5IHNpZ25pbmc.hgyY0il_MGCjP0JzlnLWG1PPOt7-09PGcvMg3AIbQR6dWbhijcNR4ki4iylGjg5BhVsPt9g7sVvpAr_MuM0KAg"; // First verify the signature. sigVerified = CkJwtW_VerifyJwtPk(jwt,token,pubKey); wprintf(L"verified: %d\n",sigVerified); if (sigVerified == FALSE) { wprintf(L"%s\n",CkJwtW_lastErrorText(jwt)); CkPublicKeyW_Dispose(pubKey); CkJwtW_Dispose(jwt); return; } // Let's see if the time constraints, if any, are valid. // The above JWT was created on the afternoon of 16-May-2016, with an expiration of 1 hour. // If the current system time is before the "nbf" time, or after the "exp" time, // then IsTimeValid will return false/0. // Also, we'll allow a leeway of 60 seconds to account for any clock skew. // Note: If the token has no "nbf" or "exp" claim fields, then IsTimeValid is always true. leeway = 60; bTimeValid = CkJwtW_IsTimeValid(jwt,token,leeway); wprintf(L"time constraints valid: %d\n",bTimeValid); // Recover the original data (the payload). payload = CkJwtW_getPayload(jwt,token); wprintf(L"%s\n",payload); // Recover the original JOSE header in the same way: joseHeader = CkJwtW_getHeader(jwt,token); wprintf(L"%s\n",joseHeader); CkPublicKeyW_Dispose(pubKey); CkJwtW_Dispose(jwt); } |
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