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(Unicode C) Verify a JWT Created by the Amazon Cognito ServiceDemonstrates how to verify a JWT created by the Amazon Cognito Service.
#include <C_CkHttpW.h> #include <C_CkStringBuilderW.h> #include <C_CkJsonObjectW.h> #include <C_CkPublicKeyW.h> #include <C_CkJwtW.h> void ChilkatSample(void) { HCkHttpW http; HCkStringBuilderW sbJsonKeys; BOOL success; HCkJsonObjectW jsonKeys; HCkJsonObjectW jsonKey1; HCkPublicKeyW pubKey1; HCkJwtW jwt; const wchar_t *token; BOOL sigVerified; int leeway; BOOL bTimeValid; const wchar_t *payload; HCkJsonObjectW json; const wchar_t *joseHeader; // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. // The public keys for this example are at https://cognito-idp.us-east-2.amazonaws.com/us-east-2_******/.well-known/jwks.json // Let's get them: http = CkHttpW_Create(); sbJsonKeys = CkStringBuilderW_Create(); success = CkHttpW_QuickGetSb(http,L"https://cognito-idp.us-east-2.amazonaws.com/us-east-2_******/.well-known/jwks.json",sbJsonKeys); if (success == FALSE) { wprintf(L"%s\n",CkHttpW_lastErrorText(http)); CkHttpW_Dispose(http); CkStringBuilderW_Dispose(sbJsonKeys); return; } jsonKeys = CkJsonObjectW_Create(); CkJsonObjectW_LoadSb(jsonKeys,sbJsonKeys); CkJsonObjectW_putEmitCompact(jsonKeys,FALSE); wprintf(L"%s\n",CkJsonObjectW_emit(jsonKeys)); // Here are the keys: // { // "keys": [ // { // "alg": "RS256", // "e": "AQAB", // "kid": "1A/L5Fsb2EsEwxy5E0cmCMS1BnMe6Jl6NXiMig4iNwU=", // "kty": "RSA", // "n": "y0w7BJrIJYi ... jKG27z2P3OKw", // "use": "sig" // }, // { // "alg": "RS256", // "e": "AQAB", // "kid": "mos6VTJnvDwurY3ghJg6IAPUq+dMwl6CL/iThzJOkzg=", // "kty": "RSA", // "n": "qbIEH-7tg6yrT ... 3Fj94ooTd0w", // "use": "sig" // } // ] // } // Try the 1st key. jsonKey1 = CkJsonObjectW_ObjectOf(jsonKeys,L"keys[0]"); if (CkJsonObjectW_getLastMethodSuccess(jsonKeys) == FALSE) { wprintf(L"Did not get the 1st JSON public key.\n"); CkHttpW_Dispose(http); CkStringBuilderW_Dispose(sbJsonKeys); CkJsonObjectW_Dispose(jsonKeys); return; } pubKey1 = CkPublicKeyW_Create(); success = CkPublicKeyW_LoadFromString(pubKey1,CkJsonObjectW_emit(jsonKey1)); if (success == FALSE) { wprintf(L"%s\n",CkPublicKeyW_lastErrorText(pubKey1)); CkHttpW_Dispose(http); CkStringBuilderW_Dispose(sbJsonKeys); CkJsonObjectW_Dispose(jsonKeys); CkPublicKeyW_Dispose(pubKey1); return; } CkJsonObjectW_Dispose(jsonKey1); wprintf(L"Success\n"); jwt = CkJwtW_Create(); // I did not include the an actual AWS Cognito token here because our test sample used customer-provided data.. token = L"eyJ..asXg"; // First verify the signature. sigVerified = CkJwtW_VerifyJwtPk(jwt,token,pubKey1); wprintf(L"verified: %d\n",sigVerified); // 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); // Now let's recover the original claims JSON (the payload). payload = CkJwtW_getPayload(jwt,token); // The payload will likely be in compact form: wprintf(L"%s\n",payload); // We can format for human viewing by loading it into Chilkat's JSON object // and emit. json = CkJsonObjectW_Create(); success = CkJsonObjectW_Load(json,payload); CkJsonObjectW_putEmitCompact(json,FALSE); wprintf(L"%s\n",CkJsonObjectW_emit(json)); // We can recover the original JOSE header in the same way: joseHeader = CkJwtW_getHeader(jwt,token); // The payload will likely be in compact form: wprintf(L"%s\n",joseHeader); // We can format for human viewing by loading it into Chilkat's JSON object // and emit. success = CkJsonObjectW_Load(json,joseHeader); CkJsonObjectW_putEmitCompact(json,FALSE); wprintf(L"%s\n",CkJsonObjectW_emit(json)); CkHttpW_Dispose(http); CkStringBuilderW_Dispose(sbJsonKeys); CkJsonObjectW_Dispose(jsonKeys); CkPublicKeyW_Dispose(pubKey1); CkJwtW_Dispose(jwt); CkJsonObjectW_Dispose(json); } |
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